US20050179332A1 - Bar type vibration motor - Google Patents
Bar type vibration motor Download PDFInfo
- Publication number
- US20050179332A1 US20050179332A1 US10/929,394 US92939404A US2005179332A1 US 20050179332 A1 US20050179332 A1 US 20050179332A1 US 92939404 A US92939404 A US 92939404A US 2005179332 A1 US2005179332 A1 US 2005179332A1
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- United States
- Prior art keywords
- rotary shaft
- vibration motor
- type vibration
- bar type
- fixed
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/56—Motors or generators having iron cores separated from armature winding
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
- H02K5/1675—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at only one end of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
- H02K7/061—Means for converting reciprocating motion into rotary motion or vice versa using rotary unbalanced masses
Definitions
- the present invention relates to a bar type vibration motor for generating vibration by rotation of an eccentric weight, and more particularly, to a bar type vibration motor capable of improving a body structure for supporting a rotary shaft fixed to a eccentric weight, a coupling structure of a stationary member and the rotary shaft, and a contacting structure of a commutator and brushes in order to facilitate fabrication, more securely support the rotary shaft, and miniaturize itself.
- the signal-generators when messages or calls are received, the signal-generators generate sound, light or vibration so that users informed of the incoming of messages or calls.
- the signal-generators are generally adopted as sound generators, illumination devices and vibrators.
- the vibrators have various vibration motors as vibration sources, in which the vibration motors are usually classified into flat type vibration motors and bar type vibration motors according to their configurations.
- the flat type vibration motors are also called coin type vibration motors because they are shaped as thin coins, and the bar type vibration motors are also called cylinder type vibration motors because they have cylindrical configurations.
- Both the flat type vibration motors and the bar type vibration motors are operated on the basis of the electromagnetic induction regardless of their configurations.
- the electromagnetic induction is a phenomenon in which electromagnetic force is generated across the magnetic field, when current is flown through conductors placed perpendicular to the magnetic field.
- the vibration motors convert electric energy into mechanical energy on the basis of the electromagnetic induction and generate vibration from the mechanical energy.
- FIG. 1 a illustrates a conventional bar type vibration motor that will be described hereinafter.
- the conventional bar type vibration motor 100 includes a stator unit 110 , a rotor unit 130 and a power supply unit 150 , in which the stator unit 110 including a body 111 and a magnet 116 will be explained first.
- the body 111 includes a housing 112 and a yoke 114 .
- the housing 112 is shaped as a pipe having opened both ends, and the yoke 114 includes a hollow cylindrical yoke body 114 b, a bearing insert groove 114 a formed at the front end of the yoke body 114 b and a flange 114 c formed on the periphery of the bearing insert groove 114 a.
- the body 111 has a double-pipe structure placing the yoke body 114 b in the housing 112 by pressing and welding the flange 114 c of the yoke 114 to one end of the housing 112 .
- the rotor unit 130 includes an eccentric weight 131 , a rotary shaft 132 , a commutator 134 and an armature 136 .
- the rotary shaft 132 is fixed to the eccentric weight 131 having an eccentric center of gravity at one end thereof, and a stationary member 138 at the other end thereof.
- the armature 136 is disposed around the rotary shaft 132 , fixed to the periphery of the stationary member 138 parallel with the rotary shaft 132 .
- the armature 136 has a structure coiled by a wire (not shown) or includes coils (not shown).
- the commutator 134 having several separate segments is attached on the side of the stationary member 138 .
- the commutator 134 is made of conductive materials, and electrically connected with the armature 136 .
- the stationary member 138 has a cylindrical projection 138 a extruded from one side of the stationary member 138 .
- the commutator 134 having the separate segments is attached on the side of the stationary member 138 to surround the projection 138 a and the side of the stationary member 138 .
- the rotor unit 130 is rotatably mounted on the stator unit 110 .
- the rotary shaft 132 is inserted into the yoke body 114 b, and rotatably supported at one end thereof by a first bearing 102 inserted into the bearing insert groove 114 a and at the other end thereof by a second bearing 104 inserted into the rear end of the yoke body 114 b.
- the armature 136 is spaced apart from the magnet 116 .
- the power supply unit 150 includes a fixing cap 152 and a pair of brushes 154 mounted in the fixing cap 152 .
- the brushes 154 are touched with the commutator 134 surrounding the periphery of the projection 138 a by coupling the fixing cap 152 to the other end of the housing 112 .
- the brushes 154 are provided with supply voltage through lead wires (not shown) connected with the brushes 154 .
- the voltage applied to the brushes 154 as above is in turn supplied to the commutator 134 touched with the brushes 154 .
- the body 111 is obtained by presseing the yoke body 114 b into the housing 112 , and then welding then together, it is difficult to apply the body 111 to a miniaturized vibration motor.
- the thickness of the housing 112 and the york 114 also get thin.
- An integral body 111 ′ shown in FIGS. 2 a and 2 b was proposed to solve the above problem.
- the proposed body 111 ′ has a double-pipe structure in which a support tube 111 a ′ is formed integrally in the body 111 ′ and a bearing insert groove 111 b ′ is formed at one end of the support tube 111 a′.
- a conventional bar type vibration motor using the integral body 111 ′ has following problems.
- the first bearing 102 disposed more adjacent to the eccentric weight 131 for supporting the rotary shaft 132 is more frequently deformed than the second bearing 104 .
- the degree of the deformation or abrasion occurred on the first 102 is different from that of the second bearing 104 .
- this approach increases the depth of the bearing insert groove 111 b ′ formed in one end of the body 12 and inserts a longer bearing or several bearings into the bearing insert groove 111 b ′, in order to reduce damage or abrasion of the bearings brought by impact.
- the length of the magnet 116 is to be reduced in proportion to the reduction of a space in the body 111 ′. This brings an another problem of degrading the performance of the vibration motor by the reduction of an area for forming a magnetic field.
- the body 111 ′ can be formed integrally, the body 111 ′ can be manufactured without deformation occurred by pressing or welding. But the expected life span of the bar type vibration motor was shortened due to the abrasion of a bearing by the eccentric weight 131 or the deformation of a bearing supporting the rotary shaft under the external impact.
- the thickness of the stationary member 138 should be increased to improve the axial coupling force between the rotary shaft 132 and the stationary member 138 .
- sparks are generated between the commutator 134 and the brushes 154 , when the brushes 154 touch the segments from one to an other.
- a bar type vibration motor comprising: a stator unit including a body having a bearing insert groove formed at one end thereof and exposed to the outside, and a magnet attached to the body; a rotor unit including a rotary shaft having one end fixed to an eccentric weight, both ends of the rotary shaft being rotatably supported in the body, and an armature fixed to the rotary shaft at a space from the magnet; and a power supply unit including a fixing cap fixed to the body and brushes mounted on the fixing cap to supply voltage to the armature.
- the body comprises a hollow cylinder of a double-pipe structure having a support tube connected with the bearing insert groove, the magnet being fixed to an outer surface of the support tube.
- a stationary member is fixed to the other end of the rotary shaft, a commutator divided into the several segments and electrically connected with the armature is attached on the side of the stationary member, the commutator is in touch with the brushes.
- the bar type vibration motor further comprises a stationary member fixed to the other end of the rotary shaft; a commutator attached on the side of the stationary member, the commutator being divided into the several segments and electrically connected with the armature, and in touch with the brushes.
- the armature has a structure coiled by a wire or may include coils.
- the bearing insert groove is formed by a projection extruded from the one end of the body to the outside, and the magnet is fixed to the inner surface of the body.
- the body is integrally formed by drawing, and the portion forming the projection of the body has uniform thickness, and the thickness of the portion forming the projection is at least the thickness of other portion in the body.
- the stationary member is shaped as a disk, and the armature is attached on the periphery of the stationary member, and more preferably the commutator may include terminals for electrical connection with the armature.
- the commutator has varistors on one side thereof for preventing spark generated through contact with the brushes and the commutator.
- the stationary member is formed integrally with the rotary shaft to house a coupling member therein.
- the brush has a free end and a fixed end bent in an acute angle to elastically contact the commutator.
- the coupling member comprises a snap ring fixed to the rotary shaft, and the coupling member comprises a pin fixedly inserted into the rotary shaft.
- the brushes are fixed to a circuit board mounted in the fixing cap to be electrically connected with the circuit board, more preferably the circuit board is a PCB or a FPC.
- FIGS. 1 a and 1 b are illustrations of a conventional bar type vibration motor, in which FIG. 1 a is a side sectional view illustrating a conventional bar type vibration motor, FIG. 1 b is a sectional view illustrating the body shown in FIG. 1 a;
- FIGS. 2 a and 2 b are illustrations of a conventional bar type vibration motor having an another body type, in which FIG. 2 a is a side sectional view illustrating a conventional bar type vibration motor, FIG. 2 b is a sectional view illustrating the body shown in FIG. 2 a;
- FIG. 3 is an exploded perspective view illustrating a bar type vibration motor according to a preferred embodiment of the present invention
- FIGS. 4 a and 4 b are illustrations of a bar type vibration motor according to a preferred embodiment of the present invention, in which FIG. 4 a is a side sectional view illustrating, FIG. 4 b is a sectional view illustrating a body shown in FIG. 4 a;
- FIGS. 5 a to 5 c are illustrations of a rotary shaft and a coupling member of a bar type vibration motor according to the present invention, in which FIG. 5 a illustrates a rotary shaft and a coupling member of a bar type vibration motor according to a first embodiment of the present invention, FIG. 5 b illustrates a modification to those shown in FIG. 5 a, and FIG. 5 c illustrates a second modification to those shown in FIG. 5 a;
- FIGS. 6 a and 6 b are illustrations of commutators of the bar type vibration motor according to the present invention, in which FIG. 6 a is a front and rear view illustrating a commutator consisting of a metal chip, and FIG. 6 b is a front and rear view illustrating a commutator formed of a printed circuit board; and
- FIG. 7 is a side sectional view illustrating a bar type vibration motor according to an alternate embodiment of the present invention.
- the bar type vibration motor 1 includes a stator unit 10 , a rotor unit 30 and a power supply unit 50 , in which the stator unit 10 will be described first.
- the stator unit 10 includes a body 12 and a magnet 14 .
- the body 12 is of a hollow cylinder formed with a cylindrical projection 12 c extruded from one end thereof to the outside.
- the body 12 has a double-pipe structure, with a hollow support tube 12 a being formed integrally at the rear end of the projection 12 c and disposed in the body 12 .
- a bearing insert groove 12 b is formed inside the projection 12 c.
- bearing insert groove 12 b is formed outside the body 12 .
- the bearing insert groove 12 b Since the diameter of the bearing insert groove 12 b is bigger than the inside diameter of the support tube 12 a that is formed integrally at the rear end of the projection 12 c, the bearing insert groove 12 b is connected with the support tube 12 a via a step formed therebetween.
- the other end of the body 12 is shaped as an opened hollow cylinder.
- the support tube 12 a is shorter than the body 12 so that the rear end of the support tube 12 a is located in the body 12 .
- the body 12 is formed integrally by shaping a sheet metal.
- the body 12 may be formed integrally via drawing that is a well-known method to form an article jointlessly on the basis of the ductility of material.
- the portion of the sheet metal forming the projection 12 c is bent at a uniform thickness, and the board thickness of the portion forming the projection 12 c is equal to or thicker than other portion of the body 12 for example the support tube 12 a to support a rotary shaft 32 to be described later more firmly.
- the stator unit 10 consists of the body 12 and the magnet attached to the body 12 . As shown in FIG. 4 a, the magnet 14 may be attached to the outer surface of the support tube 12 a.
- the rotor unit 30 includes a rotary shaft 32 and an armature 36 .
- An eccentric weight 37 is fixed to one end of the rotary shaft 32 , and a stationary member 38 is fixed to the other end of the rotary shaft 32
- the eccentric weight 37 has a perforated insert hole 37 a, and is fixed to the rotary shaft 32 by inserting the rotary shaft 32 into the insert hole 37 a and then attaching them together via calking or adhesive.
- the eccentric weight 37 has a center of gravity formed eccentrically about the insert hole 37 a. Therefore, rotating the eccentric weight 37 about the insert hole 37 a generates vibration.
- the stationary member 38 is a flat disk type without a projection formed at one side thereof different from a conventional stationary member, and a flat disk-type commutator 34 is attached on the stationary member 38 .
- a cylindrical armature 36 is attached on the stationary member 38 , and disposed parallel with and around the rotary shaft 32 , and the armature 136 may have a structure coiled by a wire (not shown) or may include coils (not shown).
- the commutator 34 composed of conductive metal chip divided into several segments is attached on the stationary member 38 , and electrically connected with the armature 36 .
- the commutator 34 is electrically connected via cables (not shown) to supply voltage to the coils or wire which may be included in the armature 36 .
- the commutator 32 may be replaced with a conductive pattern directly printed on one side of the stationary member 38 .
- the conductive pattern is electrically connected with the armature 36 .
- the commutator 36 may be also replaced with a circuit board having a conductive pattern thereon to connect the armature 36 with the conductive pattern.
- the circuit board may be preferably adopted as a Printed Circuit Board (PCB) or Flexible Printed Circuit board (FPC), but it may be applicable to any thing which has conductive patterns.
- PCB Printed Circuit Board
- FPC Flexible Printed Circuit board
- the stationary member 38 has a coupling member 33 formed integral therein, in which the coupling member 33 is coupled with a coupling groove 32 a formed on the other end of the rotary shaft 32 .
- the stationary member 38 may be injection molded to integrally house the coupling member 33 therein.
- the stationary member 38 may be formed thinner while the axial coupling force is maintained between the rotary shaft 32 and the stationary member 38 .
- the rotary shaft 32 and the coupling member 33 according to the first embodiment of the present invention are shown in FIG. 5 a, and the coupling member 33 has an opening 33 a for coupling with the coupling groove 32 a formed in the rotary shaft 32 .
- the coupling member 33 may be preferably a snap ring.
- FIG. 5 b is a view illustrating a coupling structure for a rotary shaft 32 ′ and a coupling member 33 ′ according to a modification to those in FIG. 5 a.
- a flat-end 33 b ′ is formed in the opening 33 a ′ of the coupling member 33 ′ and a flat-end 32 b ′ is formed in the coupling groove 32 a ′ so that the ends 33 b ′ and 32 b ′ contact each other to prevent the rotation the coupling member 33 ′ about the rotary shaft 32 ′.
- the stationary member injection molded to a coupling member 33 can enhance axial coupling force to the rotary shaft 32 as well as may transmit torque more efficiently from the armature to the rotary shaft.
- FIG. 5 c shows a rotary shaft 32 ′′ and a coupling member 33 ′′ according to a second modification to those in FIG. 5 a, in which the rotary shaft 32 ′′ may have an inserting hole 32 a ′′ in place of the coupling groove and a pin 33 ′′ in place of the coupling member.
- the commutator 34 is attached on one side of the stationary member 38 , and the commutator 34 may be electrically connected with the armature 36 fixed around the stationary member 38 by cables (not shown).
- the commutator 34 may be made of a metal chip divided into several segments, and has terminals 34 a extruded radially from the commutator 34 for connection with the armature 36 .
- a varistor 34 b may be attached or formed on the commutator 34 in order to prevent the commutator 34 from being damaged by sparks in the contact with brushes, which will be described later.
- the varistor 34 b is a non-linear semiconductor resistance unit converting its resistance value with respect to voltage applied to both terminals to prevent sparks by electric contacts or protect electronic components from sparks or static electricity.
- the commutator 34 may be a PCB (printed circuit board) with conductive patterns printed thereon.
- patterns may be formed on one side of the PCB to be used as the varistor 34 b.
- any of those having conductive patterns may be applied as a commutator.
- the rotor unit 30 is rotatably assembled with the stator unit 10 , and a resultant structure will describe as follow.
- a first bearing 16 a is inserted into the bearing insert groove 12 b extruded from one end of the body 12 to the outside, and a second bearing 16 b is inserted into the end of the support tube 12 a.
- the rotary shaft 32 is supported at its both ends by first and second bearings 16 a and 16 b fixed to the support tube 12 a, respectively, so the rotor unit 30 is rotatably assembled in the stator unit 10 .
- the bearing insert groove 12 b may not interfere with other components such as the magnet 14 even though its length or depth is increased.
- the bearing insert groove 12 b may be not damaged by external impact, and be deep enough to house a long bearing capable of scattering the impact.
- the power supply unit 50 includes a fixing cap 52 and brushes 54 , and the fixing cap 52 has a coupling step 52 b formed in the periphery of the fixing cap 52 to be coupled with the opened other end of the body 12 .
- the fixing cap 52 coupled with the opened other end of the body 12 has an opening 52 a therein so that a substrate member 56 can be seated in the opening 52 a.
- the substrate member 56 has conductive patterns formed thereon, and the brushes 54 are electrically connected and fixed to the conductive patterns.
- a lead wire (not shown) is electrically connected with the conductive patterns formed on the substrate member 56 to supply votage to the substrate member 56 .
- the brushes 54 supply external voltage to the armature 36 through the substrate member 56 .
- the brush 54 has a fixed end 54 a fixed to the substrate member 56 and a free end 54 b touching the commutator 34 , the fixed end 54 a is bent at an acute angle with respect to the free end 54 b.
- any one of those having conductive patterns may be applied as the substrate members 56 .
- FIG. 7 shows a bar type vibration motor according to an alternate embodiment of the present invention, which has a magnet 14 fixed to the inside of the body 12 and an armature 36 spaced from the magnet 14 unlike the foregoing embodiment.
- the body 32 of the bar type vibration motor according to embodiments of the present invention is integrally formed, the motor of present invention is free from the bending or thermal deformation of the yoke and the housing during the assembly thereof unlike the prior art.
- both of the yoke and the housing become smaller and thinner so it is difficult to fix the yoke with the housing by pressing or welding.
- the present invention can overcome the foregoing difficulty associated with the fabrication by integrally forming the body of the bar type vibration motor.
- the bearing insert groove 12 b formed by the projection 12 c extruded from the one end of the body 12 is disposed outside the body 12 , the bearing insert groove 12 b may house a long bearing without interference with other components to scatter external impact so as to protect the bearing from damage by the impact.
- the length of the magnet 14 needs not to be decreased, because the depth of the bearing insert groove 12 b is increased by extending the projection 12 c to the outside of the body 12 to house a longer bearing.
- the bar type vibration motor according to the present invention may have improved impact resistance, and therefore prevent reduction in the expected life span by the breakage of the bearing as well as the rapid abrasion of a first bearing 16 a by the rotation of the rotary shaft 32 .
- the invention uses the flat disk-type stationary member 38 and improves the contacting structure of the commutator 34 and the brushes 54 , so that the brushes 54 elastically touch the commutator 34 fixed to the stationary member 38 , in order to minimize the deformation of the brush 54 as well as decrease the size of the vibration motor.
- the stationary member 38 can retain axial coupling force to the rotary shaft 32 while reducing the thickness thereof since it is injection molded integrally with the rotary shaft 32 with the coupling member 33 for coupling with the rotary shaft 32 being housed therein.
- the invention improves the stationary member 38 into a flat circular shape as well as the contact structure between the brushes 54 and the commutator 34 so that the brushes 54 contact the commutator 34 fixed to the one side of the stationary member 38 , the projection 138 a formed in the conventional stationary member 138 ( FIG. 1 a ) becomes unnecessary, and thus it is possible to minimize the vibration motor.
- the commutator 34 or the brushes 54 can be protected from sparks generated between the commutator 34 and the brushes 54 since the varistor is formed on one side of the commutator 34 to decrease spark.
- the body may steadily support the rotary shaft while scattering external impact without shortening the magnet, since the bearing insert groove is extruded to the outside of the body.
- the bar type vibration motor may be easily manufactured and have higher durability by improving the body into an integral structure to prevent deformation in manufacturing.
- the contact structure of the commutator and the brushes, and the coupling structure of the stationary member and the rotary shaft are improved in such a fashion of miniaturizing the vibration motor.
- the varistor is mounted on the commutator to prevent the brushes or the commutator from the damage by sparks.
Abstract
Description
- This application claims the benefit of Korean Patent Application No. 2004-12511 filed on Feb. 25, 2004, and Korean Patent Application No. 2004-9506 filed on Feb. 13, 2004 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a bar type vibration motor for generating vibration by rotation of an eccentric weight, and more particularly, to a bar type vibration motor capable of improving a body structure for supporting a rotary shaft fixed to a eccentric weight, a coupling structure of a stationary member and the rotary shaft, and a contacting structure of a commutator and brushes in order to facilitate fabrication, more securely support the rotary shaft, and miniaturize itself.
- 2. Description of the Related Art
- As portable communication instruments generally used at present, mobile phones have various signal-generators to transmit various signals to users.
- Therefore, when messages or calls are received, the signal-generators generate sound, light or vibration so that users informed of the incoming of messages or calls.
- The signal-generators are generally adopted as sound generators, illumination devices and vibrators.
- On the other hand, the vibrators have various vibration motors as vibration sources, in which the vibration motors are usually classified into flat type vibration motors and bar type vibration motors according to their configurations.
- The flat type vibration motors are also called coin type vibration motors because they are shaped as thin coins, and the bar type vibration motors are also called cylinder type vibration motors because they have cylindrical configurations.
- Both the flat type vibration motors and the bar type vibration motors are operated on the basis of the electromagnetic induction regardless of their configurations.
- The electromagnetic induction is a phenomenon in which electromagnetic force is generated across the magnetic field, when current is flown through conductors placed perpendicular to the magnetic field.
- The vibration motors convert electric energy into mechanical energy on the basis of the electromagnetic induction and generate vibration from the mechanical energy.
-
FIG. 1 a illustrates a conventional bar type vibration motor that will be described hereinafter. - As shown in
FIG. 1 a, the conventional bar type vibration motor 100 includes astator unit 110, arotor unit 130 and apower supply unit 150, in which thestator unit 110 including abody 111 and amagnet 116 will be explained first. - As shown in
FIG. 1 b, thebody 111 includes ahousing 112 and ayoke 114. Thehousing 112 is shaped as a pipe having opened both ends, and theyoke 114 includes a hollowcylindrical yoke body 114 b, abearing insert groove 114 a formed at the front end of theyoke body 114 b and aflange 114 c formed on the periphery of thebearing insert groove 114 a. - The
body 111 has a double-pipe structure placing theyoke body 114 b in thehousing 112 by pressing and welding theflange 114 c of theyoke 114 to one end of thehousing 112. - As shown in
FIG. 1 a, thebody 111 formed by fixing theyoke 114 to thehousing 112 and amagnet 116 is attached on the outer surface of theyoke body 114 b of thebody 111. - Next, the
rotor unit 130 will be explained. - As shown in
FIG. 1 a, therotor unit 130 includes aneccentric weight 131, arotary shaft 132, acommutator 134 and anarmature 136. Therotary shaft 132 is fixed to theeccentric weight 131 having an eccentric center of gravity at one end thereof, and astationary member 138 at the other end thereof. - The
armature 136 is disposed around therotary shaft 132, fixed to the periphery of thestationary member 138 parallel with therotary shaft 132. Thearmature 136 has a structure coiled by a wire (not shown) or includes coils (not shown). - On the other hand, the
commutator 134 having several separate segments is attached on the side of thestationary member 138. - The
commutator 134 is made of conductive materials, and electrically connected with thearmature 136. - In this case, the
stationary member 138 has acylindrical projection 138 a extruded from one side of thestationary member 138. - Therefore, the
commutator 134 having the separate segments is attached on the side of thestationary member 138 to surround theprojection 138 a and the side of thestationary member 138. - As above mentioned, the
rotor unit 130 is rotatably mounted on thestator unit 110. - In other words, as shown in
FIG. 1 a, therotary shaft 132 is inserted into theyoke body 114 b, and rotatably supported at one end thereof by a first bearing 102 inserted into thebearing insert groove 114 a and at the other end thereof by a second bearing 104 inserted into the rear end of theyoke body 114 b. - In this case, the
armature 136 is spaced apart from themagnet 116. - Next, the
power supply unit 150 will be explained. - The
power supply unit 150 includes afixing cap 152 and a pair ofbrushes 154 mounted in thefixing cap 152. - The
brushes 154 are touched with thecommutator 134 surrounding the periphery of theprojection 138 a by coupling thefixing cap 152 to the other end of thehousing 112. - At this time, the
brushes 154 are provided with supply voltage through lead wires (not shown) connected with thebrushes 154. - The voltage applied to the
brushes 154 as above is in turn supplied to thecommutator 134 touched with thebrushes 154. - Therefore, when the wire or the coils (not shown) of the
armature 136 is energized by the voltage to thecommutator 134, electromagnetic force is generated through the interaction between thearmature 136 and themagnet 116 attached on the outer surface of theyoke body 114 b. - When the electromagnetic force is applied to the
armature 136, as therotary shaft 132 is rotated, vibration is generated by rotating theeccentric weight 131 fixed to the one end of therotary shaft 132. - However, the conventional bar type vibration motor has following problems.
- As shown in
FIG. 1 b, since thebody 111 is obtained by presseing theyoke body 114 b into thehousing 112, and then welding then together, it is difficult to apply thebody 111 to a miniaturized vibration motor. - In other words, as the bar type vibration motor is miniaturized, the thickness of the
housing 112 and theyork 114 also get thin. - Therefore, when the
yoke 114 is pressed into thehousing 112 first, theflange 114 c of theyoke 114 is bent or deformed under the pressure. - Also, when the pressed portion between the
housing 112 and theyoke 114 is welded after the pressing, there is a problem that the pressed portion is thermally deformed due to the thinness of thehousing 112. - An
integral body 111′ shown inFIGS. 2 a and 2 b was proposed to solve the above problem. - In other words, the proposed
body 111′ has a double-pipe structure in which asupport tube 111 a′ is formed integrally in thebody 111′ and a bearinginsert groove 111 b′ is formed at one end of thesupport tube 111 a′. - However, a conventional bar type vibration motor using the
integral body 111′ has following problems. - When impact is applied to a mobile phone mounted with a conventional bar type vibration motor using the
integral body 111′, the impact is transferred to first andsecond bearings rotary shaft 132. - In this case, the first bearing 102 disposed more adjacent to the
eccentric weight 131 for supporting therotary shaft 132 is more frequently deformed than the second bearing 104. - Also, when the vibration is generated by the rotation of the
rotary shaft 132, there is a problem that the first bearing 102 is worn away earlier than the second bearing 104. - Because larger load is applied to the first bearing 102 disposed more adjacent to the
eccentric weight 131, the degree of the deformation or abrasion occurred on the first 102 is different from that of the second bearing 104. - On the other hand, when the
rotary shaft 132 rotates, the abrasion and deformation of the bearings prevents therotary shaft 132 from rotating smoothly causing undesirable noise. - Therefore, there was a problem that the expected life span of a bar type vibration motor was shortened.
- As a solution to the above problem, there was proposed an approach for increasing the length of the first bearing, on which bigger load is exerted to reduce the deformation or abrasion.
- That is, this approach increases the depth of the
bearing insert groove 111 b′ formed in one end of thebody 12 and inserts a longer bearing or several bearings into the bearinginsert groove 111 b′, in order to reduce damage or abrasion of the bearings brought by impact. - But, if the depth of the
bearing insert groove 111 b′ is increased to prolong the length of the bearing inserted into thebearing insert groove 111 b′ as above, the length of themagnet 116 is to be reduced in proportion to the reduction of a space in thebody 111′. This brings an another problem of degrading the performance of the vibration motor by the reduction of an area for forming a magnetic field. - Therefore, because the
body 111′ can be formed integrally, thebody 111′ can be manufactured without deformation occurred by pressing or welding. But the expected life span of the bar type vibration motor was shortened due to the abrasion of a bearing by theeccentric weight 131 or the deformation of a bearing supporting the rotary shaft under the external impact. - Also, as shown in
FIGS. 1 a and 2 a, because therotary shaft 132 is fixedly inserted into thestationary member 138, the thickness of thestationary member 138 should be increased to improve the axial coupling force between therotary shaft 132 and thestationary member 138. - On the other hand, it is difficult to miniaturize the vibration motor, because a
projection 138 a is formed on the side of thestationary member 138 to contact thebrushes 154 with thecommutator 134. - And, because the
commutator 134 is divided into several segments, sparks are generated between thecommutator 134 and thebrushes 154, when thebrushes 154 touch the segments from one to an other. - Unfortunately, the sparks occuring as above damage the
commutator 134 and thebrushes 154. - Therefore the present invention has been made to solve the foregoing problems of the prior art.
- It is an object of the present invention to provide a bar type vibration motor having a body designed into an integral structure, so that a bearing insert groove is formed of a projection extruded from the body, in order to steadily support the rotary shaft.
- It is another object of the present invention to provide a bar type vibration motor with an integral body structure to facilitate manufacturing while improving endurance.
- It is other object of the present invention to provide a bar type vibration motor improved in a contact structure between the commutator and the brushes and coupling structure between a stationary member and a rotary shaft in order to miniaturize the vibration motor.
- It is yet another object of the present invention to provide a bar type vibration motor having a commutator mounted with a varistor thereon to prevent a brush or a commutator from damage by spark.
- According to an aspect of the invention for realizing the object, there is provided a bar type vibration motor comprising: a stator unit including a body having a bearing insert groove formed at one end thereof and exposed to the outside, and a magnet attached to the body; a rotor unit including a rotary shaft having one end fixed to an eccentric weight, both ends of the rotary shaft being rotatably supported in the body, and an armature fixed to the rotary shaft at a space from the magnet; and a power supply unit including a fixing cap fixed to the body and brushes mounted on the fixing cap to supply voltage to the armature.
- Preferably, the body comprises a hollow cylinder of a double-pipe structure having a support tube connected with the bearing insert groove, the magnet being fixed to an outer surface of the support tube.
- Preferably, a stationary member is fixed to the other end of the rotary shaft, a commutator divided into the several segments and electrically connected with the armature is attached on the side of the stationary member, the commutator is in touch with the brushes.
- The bar type vibration motor further comprises a stationary member fixed to the other end of the rotary shaft; a commutator attached on the side of the stationary member, the commutator being divided into the several segments and electrically connected with the armature, and in touch with the brushes.
- Preferably, the armature has a structure coiled by a wire or may include coils.
- Preferably, the bearing insert groove is formed by a projection extruded from the one end of the body to the outside, and the magnet is fixed to the inner surface of the body.
- Preferably, the body is integrally formed by drawing, and the portion forming the projection of the body has uniform thickness, and the thickness of the portion forming the projection is at least the thickness of other portion in the body.
- Preferably, the stationary member is shaped as a disk, and the armature is attached on the periphery of the stationary member, and more preferably the commutator may include terminals for electrical connection with the armature.
- And, the commutator has varistors on one side thereof for preventing spark generated through contact with the brushes and the commutator.
- Preferably, the stationary member is formed integrally with the rotary shaft to house a coupling member therein.
- Preferably, the brush has a free end and a fixed end bent in an acute angle to elastically contact the commutator.
- Preferably, the coupling member comprises a snap ring fixed to the rotary shaft, and the coupling member comprises a pin fixedly inserted into the rotary shaft.
- Preferably, the brushes are fixed to a circuit board mounted in the fixing cap to be electrically connected with the circuit board, more preferably the circuit board is a PCB or a FPC.
-
FIGS. 1 a and 1 b are illustrations of a conventional bar type vibration motor, in whichFIG. 1 a is a side sectional view illustrating a conventional bar type vibration motor,FIG. 1 b is a sectional view illustrating the body shown inFIG. 1 a; -
FIGS. 2 a and 2 b are illustrations of a conventional bar type vibration motor having an another body type, in whichFIG. 2 a is a side sectional view illustrating a conventional bar type vibration motor,FIG. 2 b is a sectional view illustrating the body shown inFIG. 2 a; -
FIG. 3 is an exploded perspective view illustrating a bar type vibration motor according to a preferred embodiment of the present invention; -
FIGS. 4 a and 4 b are illustrations of a bar type vibration motor according to a preferred embodiment of the present invention, in whichFIG. 4 a is a side sectional view illustrating,FIG. 4 b is a sectional view illustrating a body shown inFIG. 4 a; -
FIGS. 5 a to 5 c are illustrations of a rotary shaft and a coupling member of a bar type vibration motor according to the present invention, in whichFIG. 5 a illustrates a rotary shaft and a coupling member of a bar type vibration motor according to a first embodiment of the present invention,FIG. 5 b illustrates a modification to those shown inFIG. 5 a, andFIG. 5 c illustrates a second modification to those shown inFIG. 5 a; -
FIGS. 6 a and 6 b are illustrations of commutators of the bar type vibration motor according to the present invention, in whichFIG. 6 a is a front and rear view illustrating a commutator consisting of a metal chip, andFIG. 6 b is a front and rear view illustrating a commutator formed of a printed circuit board; and -
FIG. 7 is a side sectional view illustrating a bar type vibration motor according to an alternate embodiment of the present invention. - As shown in
FIG. 3 , the bar type vibration motor 1 according to the present invention includes astator unit 10, arotor unit 30 and apower supply unit 50, in which thestator unit 10 will be described first. - As shown in
FIGS. 3 and 4 , thestator unit 10 includes abody 12 and amagnet 14. - The
body 12 is of a hollow cylinder formed with acylindrical projection 12 c extruded from one end thereof to the outside. - In this case, the
body 12 has a double-pipe structure, with ahollow support tube 12 a being formed integrally at the rear end of theprojection 12 c and disposed in thebody 12. - On the other hand, as shown in
FIG. 4 b, a bearinginsert groove 12 b is formed inside theprojection 12 c. - Therefore, bearing
insert groove 12 b is formed outside thebody 12. - Since the diameter of the bearing
insert groove 12 b is bigger than the inside diameter of thesupport tube 12 a that is formed integrally at the rear end of theprojection 12 c, the bearinginsert groove 12 b is connected with thesupport tube 12 a via a step formed therebetween. - The other end of the
body 12 is shaped as an opened hollow cylinder. - The
support tube 12 a is shorter than thebody 12 so that the rear end of thesupport tube 12 a is located in thebody 12. - On the other hand, as shown in
FIG. 4 b, thebody 12 is formed integrally by shaping a sheet metal. Preferably, thebody 12 may be formed integrally via drawing that is a well-known method to form an article jointlessly on the basis of the ductility of material. - In this case, the portion of the sheet metal forming the
projection 12 c is bent at a uniform thickness, and the board thickness of the portion forming theprojection 12 c is equal to or thicker than other portion of thebody 12 for example thesupport tube 12 a to support arotary shaft 32 to be described later more firmly. - The
stator unit 10 consists of thebody 12 and the magnet attached to thebody 12. As shown inFIG. 4 a, themagnet 14 may be attached to the outer surface of thesupport tube 12 a. - Next, the
rotor unit 30 will be explained with reference to theFIGS. 3 and 4 a. - As shown in
FIG. 3 , therotor unit 30 includes arotary shaft 32 and anarmature 36. - An
eccentric weight 37 is fixed to one end of therotary shaft 32, and astationary member 38 is fixed to the other end of therotary shaft 32 In other words, theeccentric weight 37 has a perforatedinsert hole 37 a, and is fixed to therotary shaft 32 by inserting therotary shaft 32 into theinsert hole 37 a and then attaching them together via calking or adhesive. - In this case, the
eccentric weight 37 has a center of gravity formed eccentrically about theinsert hole 37 a. Therefore, rotating theeccentric weight 37 about theinsert hole 37 a generates vibration. - On the other hand, as shown in
FIG. 4 a, thestationary member 38 is a flat disk type without a projection formed at one side thereof different from a conventional stationary member, and a flat disk-type commutator 34 is attached on thestationary member 38. - A
cylindrical armature 36 is attached on thestationary member 38, and disposed parallel with and around therotary shaft 32, and thearmature 136 may have a structure coiled by a wire (not shown) or may include coils (not shown). - In this case, the
commutator 34 composed of conductive metal chip divided into several segments is attached on thestationary member 38, and electrically connected with thearmature 36. - In other words, the
commutator 34 is electrically connected via cables (not shown) to supply voltage to the coils or wire which may be included in thearmature 36. - Therefore, when the
commutator 34 is applied with external voltage, current is supplied to thearmature 36. - While the present embodiment has described about the
commutator 32 made of conductive metal chip, thecommutator 32 may be replaced with a conductive pattern directly printed on one side of thestationary member 38. In this case, the conductive pattern is electrically connected with thearmature 36. - Alternatively, the
commutator 36 may be also replaced with a circuit board having a conductive pattern thereon to connect thearmature 36 with the conductive pattern. - In this case, the circuit board may be preferably adopted as a Printed Circuit Board (PCB) or Flexible Printed Circuit board (FPC), but it may be applicable to any thing which has conductive patterns.
- On the other hand, as shown in
FIG. 4 a, thestationary member 38 has acoupling member 33 formed integral therein, in which thecoupling member 33 is coupled with acoupling groove 32 a formed on the other end of therotary shaft 32. - In other words, after the
coupling member 33 is coupled with thecoupling groove 32 a, thestationary member 38 may be injection molded to integrally house thecoupling member 33 therein. - Therefore, the
stationary member 38 may be formed thinner while the axial coupling force is maintained between therotary shaft 32 and thestationary member 38. - The
rotary shaft 32 and thecoupling member 33 according to the first embodiment of the present invention are shown inFIG. 5 a, and thecoupling member 33 has anopening 33 a for coupling with thecoupling groove 32 a formed in therotary shaft 32. Thecoupling member 33 may be preferably a snap ring. - On the other hand,
FIG. 5 b is a view illustrating a coupling structure for arotary shaft 32′ and acoupling member 33′ according to a modification to those inFIG. 5 a. A flat-end 33 b′ is formed in theopening 33 a′ of thecoupling member 33′ and a flat-end 32 b′ is formed in thecoupling groove 32 a′ so that the ends 33 b′ and 32 b′ contact each other to prevent the rotation thecoupling member 33′ about therotary shaft 32′. - Therefore, the stationary member injection molded to a
coupling member 33 can enhance axial coupling force to therotary shaft 32 as well as may transmit torque more efficiently from the armature to the rotary shaft. -
FIG. 5 c shows arotary shaft 32″ and acoupling member 33″ according to a second modification to those inFIG. 5 a, in which therotary shaft 32″ may have an insertinghole 32 a″ in place of the coupling groove and apin 33″ in place of the coupling member. - On the other hand, as shown in
FIG. 4 a, thecommutator 34 is attached on one side of thestationary member 38, and thecommutator 34 may be electrically connected with thearmature 36 fixed around thestationary member 38 by cables (not shown). - In this case, as shown in
FIG. 6 a, thecommutator 34 may be made of a metal chip divided into several segments, and hasterminals 34 a extruded radially from thecommutator 34 for connection with thearmature 36. - Also, a
varistor 34 b may be attached or formed on thecommutator 34 in order to prevent thecommutator 34 from being damaged by sparks in the contact with brushes, which will be described later. - The
varistor 34 b is a non-linear semiconductor resistance unit converting its resistance value with respect to voltage applied to both terminals to prevent sparks by electric contacts or protect electronic components from sparks or static electricity. - On the other hand, as shown in
FIG. 6 b, thecommutator 34 may be a PCB (printed circuit board) with conductive patterns printed thereon. - In this case, patterns may be formed on one side of the PCB to be used as the
varistor 34 b. - In the present embodiment, while the PCB is adopted as a commutator, any of those having conductive patterns may be applied as a commutator.
- The
rotor unit 30 is rotatably assembled with thestator unit 10, and a resultant structure will describe as follow. - As shown in
FIG. 4 a, afirst bearing 16 a is inserted into the bearinginsert groove 12 b extruded from one end of thebody 12 to the outside, and asecond bearing 16 b is inserted into the end of thesupport tube 12 a. - The
rotary shaft 32 is supported at its both ends by first andsecond bearings support tube 12 a, respectively, so therotor unit 30 is rotatably assembled in thestator unit 10. - In this case, because the
bearing insert groove 12 b is projected outward from thebody 12, the bearinginsert groove 12 b may not interfere with other components such as themagnet 14 even though its length or depth is increased. - Therefore, the bearing
insert groove 12 b may be not damaged by external impact, and be deep enough to house a long bearing capable of scattering the impact. - Next, the
power supply unit 50 will be explained. - As shown in
FIG. 3 , thepower supply unit 50 includes a fixingcap 52 and brushes 54, and the fixingcap 52 has acoupling step 52 b formed in the periphery of the fixingcap 52 to be coupled with the opened other end of thebody 12. - The fixing
cap 52 coupled with the opened other end of thebody 12 has anopening 52 a therein so that asubstrate member 56 can be seated in theopening 52 a. - The
substrate member 56 has conductive patterns formed thereon, and thebrushes 54 are electrically connected and fixed to the conductive patterns. A lead wire (not shown) is electrically connected with the conductive patterns formed on thesubstrate member 56 to supply votage to thesubstrate member 56. - Therefore, the
brushes 54 supply external voltage to thearmature 36 through thesubstrate member 56. - On the other hand, as shown in
FIG. 4 a, when the fixingcap 52 is coupled with the other end of thebody 12, thebrushes 54 are elastically touched with thecommutator 34 fixed to thestationary member 38, - In this case, the
brush 54 has a fixedend 54 a fixed to thesubstrate member 56 and afree end 54 b touching thecommutator 34, thefixed end 54 a is bent at an acute angle with respect to thefree end 54 b. - In other words, when the fixing
cap 52 is coupled with the other end of thebody 12, thefree end 54 b is compressed toward thefixed end 54 a by thefree end 54 b to elastically touch thecommutator 34 attached on thestationary member 38. - While a PCB or FPC is adopted as the
substrate member 56 to which thefixed end 54 a of thebrush 54 is fixed, any one of those having conductive patterns may be applied as thesubstrate members 56. -
FIG. 7 shows a bar type vibration motor according to an alternate embodiment of the present invention, which has amagnet 14 fixed to the inside of thebody 12 and anarmature 36 spaced from the magnet14 unlike the foregoing embodiment. - Other components of the alternate embodiment of the present invention are the same as those of the above mentioned embodiment, so they will not be described hereinafter.
- As above mentioned, because the
body 32 of the bar type vibration motor according to embodiments of the present invention is integrally formed, the motor of present invention is free from the bending or thermal deformation of the yoke and the housing during the assembly thereof unlike the prior art. - As the bar type vibration motor is miniaturized and lighter, both of the yoke and the housing become smaller and thinner so it is difficult to fix the yoke with the housing by pressing or welding.
- However, the present invention can overcome the foregoing difficulty associated with the fabrication by integrally forming the body of the bar type vibration motor.
- On the other hand, because the
bearing insert groove 12 b formed by theprojection 12 c extruded from the one end of thebody 12 is disposed outside thebody 12, the bearinginsert groove 12 b may house a long bearing without interference with other components to scatter external impact so as to protect the bearing from damage by the impact. - In other words, the length of the
magnet 14 needs not to be decreased, because the depth of the bearinginsert groove 12 b is increased by extending theprojection 12 c to the outside of thebody 12 to house a longer bearing. - Therefore, because the magnetic field formed in the body is not decreased, the performance of the bar type vibration motor is not deteriorated and the
rotary shaft 32 is steadily supported. So, the bar type vibration motor according to the present invention may have improved impact resistance, and therefore prevent reduction in the expected life span by the breakage of the bearing as well as the rapid abrasion of afirst bearing 16 a by the rotation of therotary shaft 32. - Also, the invention uses the flat disk-type
stationary member 38 and improves the contacting structure of thecommutator 34 and thebrushes 54, so that thebrushes 54 elastically touch thecommutator 34 fixed to thestationary member 38, in order to minimize the deformation of thebrush 54 as well as decrease the size of the vibration motor. - On the other hand, the
stationary member 38 can retain axial coupling force to therotary shaft 32 while reducing the thickness thereof since it is injection molded integrally with therotary shaft 32 with thecoupling member 33 for coupling with therotary shaft 32 being housed therein. - Also, since the invention improves the
stationary member 38 into a flat circular shape as well as the contact structure between thebrushes 54 and thecommutator 34 so that thebrushes 54 contact thecommutator 34 fixed to the one side of thestationary member 38, theprojection 138 a formed in the conventional stationary member 138(FIG. 1 a) becomes unnecessary, and thus it is possible to minimize the vibration motor. - The
commutator 34 or thebrushes 54 can be protected from sparks generated between thecommutator 34 and thebrushes 54 since the varistor is formed on one side of thecommutator 34 to decrease spark. - While the present invention has been described with reference to the particular illustrative embodiments and the accompanying drawings, it is not to be limited thereto but will be defined by the appended claims. It is to be appreciated that those skilled in the art can substitute, change or modify the embodiments into various forms without departing from the scope and spirit of the present invention.
- According to the present invention, the body may steadily support the rotary shaft while scattering external impact without shortening the magnet, since the bearing insert groove is extruded to the outside of the body.
- Further, the bar type vibration motor may be easily manufactured and have higher durability by improving the body into an integral structure to prevent deformation in manufacturing.
- Moreover, the contact structure of the commutator and the brushes, and the coupling structure of the stationary member and the rotary shaft are improved in such a fashion of miniaturizing the vibration motor. In addition, the varistor is mounted on the commutator to prevent the brushes or the commutator from the damage by sparks.
Claims (21)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2004-9506 | 2004-02-13 | ||
KR1020040009506A KR20050081317A (en) | 2004-02-13 | 2004-02-13 | Bar type vibration motor |
KR2004-12511 | 2004-02-25 | ||
KR1020040012511A KR100568293B1 (en) | 2004-02-25 | 2004-02-25 | Bar type vibration motor |
Publications (2)
Publication Number | Publication Date |
---|---|
US6930419B1 US6930419B1 (en) | 2005-08-16 |
US20050179332A1 true US20050179332A1 (en) | 2005-08-18 |
Family
ID=34829549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/929,394 Expired - Fee Related US6930419B1 (en) | 2004-02-13 | 2004-08-31 | Bar type vibration motor |
Country Status (4)
Country | Link |
---|---|
US (1) | US6930419B1 (en) |
JP (1) | JP2005229791A (en) |
CN (1) | CN100373749C (en) |
TW (1) | TWI283957B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060284501A1 (en) * | 2005-06-07 | 2006-12-21 | Sanyo Seimitsu Co., Ltd. | Vibration motor |
US20070063602A1 (en) * | 2005-09-16 | 2007-03-22 | Samsung Electro-Mechanics Co., Ltd. | Vibration motor provided with a thin blocking body of a communtator's breakaway |
WO2016168707A1 (en) * | 2015-04-17 | 2016-10-20 | Martin Engineering Company | Electrically driven industrial vibrator with circumjacent eccentric weight and motor |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100722601B1 (en) * | 2005-09-16 | 2007-05-28 | 삼성전기주식회사 | Vibration motor |
CN103545695B (en) * | 2008-11-18 | 2017-02-01 | 广东德昌电机有限公司 | Commutator manufacturing method |
US20130087532A1 (en) * | 2011-10-07 | 2013-04-11 | Ronald D. Gentry | Self securing brazing preform clip |
JP6353258B2 (en) * | 2014-03-31 | 2018-07-04 | 日本電産サンキョー株式会社 | Bearing mechanism and motor device |
CN106208613B (en) * | 2016-07-21 | 2018-09-21 | 瑞声科技(新加坡)有限公司 | Linear vibration electric motor |
CN108429571B (en) * | 2018-03-12 | 2019-10-22 | 深圳市杉川机器人有限公司 | A kind of rotating device and rotating radar device |
CN116388429B (en) * | 2023-04-20 | 2024-03-01 | 上海莘汭驱动技术有限公司 | Hollow cup motor rotor structure |
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- 2004-08-31 US US10/929,394 patent/US6930419B1/en not_active Expired - Fee Related
- 2004-09-02 JP JP2004256161A patent/JP2005229791A/en active Pending
- 2004-09-10 CN CNB2004100771284A patent/CN100373749C/en not_active Expired - Fee Related
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US4412146A (en) * | 1974-07-13 | 1983-10-25 | Fuetterer Bodo | Electric motor control |
US4590814A (en) * | 1980-10-14 | 1986-05-27 | Wadensten Theodore S | Vibration dampening apparatus for motor actuated eccentric forces |
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US20070063602A1 (en) * | 2005-09-16 | 2007-03-22 | Samsung Electro-Mechanics Co., Ltd. | Vibration motor provided with a thin blocking body of a communtator's breakaway |
US7598639B2 (en) | 2005-09-16 | 2009-10-06 | Samsung Electro-Mechanics Co., Ltd. | Vibration motor provided with a thin blocking body of a communtator's breakaway |
WO2016168707A1 (en) * | 2015-04-17 | 2016-10-20 | Martin Engineering Company | Electrically driven industrial vibrator with circumjacent eccentric weight and motor |
US9882449B2 (en) | 2015-04-17 | 2018-01-30 | Martin Engineering Company | Electrically driven industrial vibrator with circumjacent eccentric weight and motor |
US10090731B2 (en) | 2015-04-17 | 2018-10-02 | Martin Engineering Company | Electrically driven industrial vibrator with circumjacent eccentric weight and motor |
Also Published As
Publication number | Publication date |
---|---|
TWI283957B (en) | 2007-07-11 |
US6930419B1 (en) | 2005-08-16 |
TW200527800A (en) | 2005-08-16 |
JP2005229791A (en) | 2005-08-25 |
CN100373749C (en) | 2008-03-05 |
CN1655423A (en) | 2005-08-17 |
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