CA2032825A1 - Flat motor of reduced length - Google Patents
Flat motor of reduced lengthInfo
- Publication number
- CA2032825A1 CA2032825A1 CA002032825A CA2032825A CA2032825A1 CA 2032825 A1 CA2032825 A1 CA 2032825A1 CA 002032825 A CA002032825 A CA 002032825A CA 2032825 A CA2032825 A CA 2032825A CA 2032825 A1 CA2032825 A1 CA 2032825A1
- Authority
- CA
- Canada
- Prior art keywords
- assembly
- motor
- stationary housing
- armature
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- 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
- H02K23/54—Disc armature motors or generators
-
- 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
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- 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
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S310/00—Electrical generator or motor structure
- Y10S310/06—Printed-circuit motors and components
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc Machiner (AREA)
- Motor Or Generator Frames (AREA)
- Windings For Motors And Generators (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
ABSTRACT
There is disclosed a flat motor of reduced length and maximized power output and which is suitable to being disposed in a limited space configuration and a close tolerance within other objects which may be present in such limited space.
There is disclosed a flat motor of reduced length and maximized power output and which is suitable to being disposed in a limited space configuration and a close tolerance within other objects which may be present in such limited space.
Description
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FLA'r ~OTOR O~ R~D~CBD l~N~rH
FLA'r ~OTOR O~ R~D~CBD l~N~rH
2 This invention relates to motors. More particularly, 3 it relates to a 1at motor o~ reduced lengt~l and maximized power j output.
ACR~RO~:IND O:@ TH:ES INV~3NTION
6 Flat or "pancake'l motors have been employed in numerous 7 applications where length is a critical Eactor. In general, 8 axial air gap "pancake" armature desi.gns provide the shortest 9 length motor pro~iles ava.ilable and are characterized by axial ¦ air gap, printed, stamped or wire wound armatures and axi.al or 11 radial orientad brush/spring assemblies for axial or radial 12 commutation.
13 While known motors of this type have proved themselves 14 beneficial for their desired purposes, today there are many applications where redu~tion o~ length need be optimized even 16 further. For examp}e, this i5 the case with motor used in many 17 automotive applications, such as in radiator and condenser 18 cooling modules, as well as window lifts, blower assemblies and 19 the like. Engine compar~ments and body panels in automobiles are constantly decreasing in available volume while passenger space 21 is constant or increasing. Consequently, minimizing length and 22 weight, as well as costs, while maximizing power output are 23 : important criteria for not only automotive applications but also 24 other application~ of such motors, as, for example, aerospace, 25 ~ industrial and other commercial applications. It is to be 26 understood, therefore, whil~ the flat motor of reduced length of - 27 this invention is disclosed in its relation to automotive 28 applications, it may also be employed in a wide variety of 29 aerospace, indu~trial and commercial applications~
Accordingly, it i5 the purpose of this invention to : :
31 provide a motor havinq reduced length and weight, as well as 32 minimized co~ts o~ manufacturing, while increasing ef~iciency and ~:
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2~32~2~
1 output power. In the past, in order to reduce motor length, 2 alternatives such as double cage magnet structures, that i5, two 3 individual magnet lengths, bearing journals located within the 4 stamping, and radially oriented brush holder assemblies located between magnet poles on wire wound armature designs with standard 6 commutation and rear radial exit leads, have been employed.
7 There exists, however, a need to provide a motor embodying these 8 features and others in an even more optimized manner. The present inventi n ~ul~ 11s sucn needs.
:
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BRIEF STATEME~T OF T~E INVENTION
. . .
In accordance with this invention, there is provided a flat D.C. printed circu:it or stamped armature electric motor having a reduced length from front to rear comprising in combination a stati.onary housing having front and rear housing assemblies, a rotatable shaft disposed in the stationary housing on the central axis of the motor and at least part of which protrudes through the front housiny assembly of the stationary housing; a stator assembly located in the stationary housing; an armature assembly having planar windings located in the stationary housing;
means for mounting the assemblies and for rotating the armature assembly in a planar path past the stator assembly located in the stationary housing, the stator assembly including a magnetic circuit assembly : directing a magnetic field to the planar windings of the armature àssembly in a direction normal to the plane of the armature; commutation means, including a brush assembly, located in the stationary housing in the viainity of the armature assembly on the same side : ~ thereof as the rotatable shaft protrudes through the ; stationary housing and for electrically energizing the planar vindings of the armature assembly and imparting a rotary motion thereto past the stator assembly; and wire means connected to the brush assembly and exiting sd~
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the stationary housing at a point radially distant from the central axis of the motor and outside the outer diameter of the armature assembly and which pass through the interior of the stationary housing between the front housing assembly thereof and ~:he rear housing assembly, whereby the disposition of the commutation means includ:ing the brush means results in a motor of reduced length from front to rear and which is adaptable to being di.sposed in a limited space configuration and in close tolerance with other objects which may be present i~ the limited space configuration.
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2~3282~ 1 1 TR~ D~A~ING8 2 The aforementioned aspects o~ this invention and other 3 features thereof are set forth in the following description of 4 ¦ the invention which is to be taken in conjunction with the 5 1 acco~panying Drawings in which:
ACR~RO~:IND O:@ TH:ES INV~3NTION
6 Flat or "pancake'l motors have been employed in numerous 7 applications where length is a critical Eactor. In general, 8 axial air gap "pancake" armature desi.gns provide the shortest 9 length motor pro~iles ava.ilable and are characterized by axial ¦ air gap, printed, stamped or wire wound armatures and axi.al or 11 radial orientad brush/spring assemblies for axial or radial 12 commutation.
13 While known motors of this type have proved themselves 14 beneficial for their desired purposes, today there are many applications where redu~tion o~ length need be optimized even 16 further. For examp}e, this i5 the case with motor used in many 17 automotive applications, such as in radiator and condenser 18 cooling modules, as well as window lifts, blower assemblies and 19 the like. Engine compar~ments and body panels in automobiles are constantly decreasing in available volume while passenger space 21 is constant or increasing. Consequently, minimizing length and 22 weight, as well as costs, while maximizing power output are 23 : important criteria for not only automotive applications but also 24 other application~ of such motors, as, for example, aerospace, 25 ~ industrial and other commercial applications. It is to be 26 understood, therefore, whil~ the flat motor of reduced length of - 27 this invention is disclosed in its relation to automotive 28 applications, it may also be employed in a wide variety of 29 aerospace, indu~trial and commercial applications~
Accordingly, it i5 the purpose of this invention to : :
31 provide a motor havinq reduced length and weight, as well as 32 minimized co~ts o~ manufacturing, while increasing ef~iciency and ~:
.. : ~
2~32~2~
1 output power. In the past, in order to reduce motor length, 2 alternatives such as double cage magnet structures, that i5, two 3 individual magnet lengths, bearing journals located within the 4 stamping, and radially oriented brush holder assemblies located between magnet poles on wire wound armature designs with standard 6 commutation and rear radial exit leads, have been employed.
7 There exists, however, a need to provide a motor embodying these 8 features and others in an even more optimized manner. The present inventi n ~ul~ 11s sucn needs.
:
- ~\
BRIEF STATEME~T OF T~E INVENTION
. . .
In accordance with this invention, there is provided a flat D.C. printed circu:it or stamped armature electric motor having a reduced length from front to rear comprising in combination a stati.onary housing having front and rear housing assemblies, a rotatable shaft disposed in the stationary housing on the central axis of the motor and at least part of which protrudes through the front housiny assembly of the stationary housing; a stator assembly located in the stationary housing; an armature assembly having planar windings located in the stationary housing;
means for mounting the assemblies and for rotating the armature assembly in a planar path past the stator assembly located in the stationary housing, the stator assembly including a magnetic circuit assembly : directing a magnetic field to the planar windings of the armature àssembly in a direction normal to the plane of the armature; commutation means, including a brush assembly, located in the stationary housing in the viainity of the armature assembly on the same side : ~ thereof as the rotatable shaft protrudes through the ; stationary housing and for electrically energizing the planar vindings of the armature assembly and imparting a rotary motion thereto past the stator assembly; and wire means connected to the brush assembly and exiting sd~
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. .
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.
the stationary housing at a point radially distant from the central axis of the motor and outside the outer diameter of the armature assembly and which pass through the interior of the stationary housing between the front housing assembly thereof and ~:he rear housing assembly, whereby the disposition of the commutation means includ:ing the brush means results in a motor of reduced length from front to rear and which is adaptable to being di.sposed in a limited space configuration and in close tolerance with other objects which may be present i~ the limited space configuration.
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2~3282~ 1 1 TR~ D~A~ING8 2 The aforementioned aspects o~ this invention and other 3 features thereof are set forth in the following description of 4 ¦ the invention which is to be taken in conjunction with the 5 1 acco~panying Drawings in which:
6 ll Fig. 1 is a lateral, sectional view of a motor 7 1 1 according to the invention t~ken along the central axi5 thereof 8 ¦I showing the bearings journall~d o~f the front housing assembly;
9 l! Fig. 2 is a modi~ication o:f the motor illustrated in l Fig. 1 showing the bearings journalled within the front and rear i 11 endcaps of the motor;
12 ¦ Fig. 3 is an illustration o~ a lateral, sectional view 13 I of the motor shown in Fig. 1 mounted to and within the hub 14 ¦ portion o~ a fan; and Fig. 4 is a graph showing tha relationship of the motor 16 1 torque constant (kt) and magnet length in D.C. motors such as 17 ¦ that of the present invention.
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1,l 1,1 2~3282~
DE:~CRIP~ION OF T~115 P~Rl:Fl~RRED ~MBODIMl~NT8 2 Referring now more particularly to Fig. 1, a motor 12 3 in accordance with the invention comprises brush holder assem~ly 4 11, including a spring 11' and brush 11", located on the output sha~t side of the motor housiny which is comprised o~ a front 6 housing assembly 13 and a rear housing assembly 14 provided with ;
7 endcaps elements 13' and 14', respectively. At least one other 8 brush holder assembly is present, but not visible in Fig. 1, for 9 !I the motor to operate. In the motor shown in Fig. 1, a stator ¦l assembly is located in the motor hou~sing being supported thereby 11 ¦ and comprising a double cage magnet structure 16, although it is 12 ¦ to be understood that a single cage structure can be employed in 13 the practice of this invention.
14 Motor leads 17 can be passed under or through a magnet or between a magnet and the housing and then exit axially or 16~ radially from th~ housing through ~he rear or front of tha motor.
17 In the embodiment shown in Fig. 1~ leads 17 are disposed in a 18 groove 18 oP the magnet 19 and exit axially through the rear 19 ¦ housing assembly 13.
An armature assembly comprising planar windings 26 is 21 also located in the housing and supported on armature hub 24.
22 Bearings 20 and 21 are recessed within the motor 23 housing assemblies 13 and 14 by bearing journals within the 24 endcaps 13' and 14' of housing assemblies 13 and 14, r spectively, or within a separate spindle assembly 22 or combination th~reof. It is also to be understood that it is 27 1 within the purview of this invention to journal the bearings all 28 off the front housing assembly 13, as illustrated in Fig. 1, the 29 rear housing assembly 14, or to split them up between the front 3:0 and rear endcaps 13'~and 14l of the motor as shown in Fig. 2.
31 Still further, the bearings 20 and 21 are tucked within the 32 armature hub 24 and within the magnet inner diameters.
I
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2~3282~
1 Strengthening of the rear housing portion 14, if 2 desired or required, is accomplished by ~orming a rib or 3 depress.ion ~5 which falls into the magnet inner diameter 27, thus 4 eliminating the need for any protruding ribs or other metal forming. Another formed depression 28 located on the front 6 housing assembly 13 allows external load features to be located 7 1 closer to the ~ront of the motor, thus shortening the package 8 ¦ even further, as well as allowing for reduction of the overall 9 ¦ lPngth of sha~t 30.
12 ¦ Fig. 3 is an illustration o~ a lateral, sectional view 13 I of the motor shown in Fig. 1 mounted to and within the hub 14 ¦ portion o~ a fan; and Fig. 4 is a graph showing tha relationship of the motor 16 1 torque constant (kt) and magnet length in D.C. motors such as 17 ¦ that of the present invention.
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1,l 1,1 2~3282~
DE:~CRIP~ION OF T~115 P~Rl:Fl~RRED ~MBODIMl~NT8 2 Referring now more particularly to Fig. 1, a motor 12 3 in accordance with the invention comprises brush holder assem~ly 4 11, including a spring 11' and brush 11", located on the output sha~t side of the motor housiny which is comprised o~ a front 6 housing assembly 13 and a rear housing assembly 14 provided with ;
7 endcaps elements 13' and 14', respectively. At least one other 8 brush holder assembly is present, but not visible in Fig. 1, for 9 !I the motor to operate. In the motor shown in Fig. 1, a stator ¦l assembly is located in the motor hou~sing being supported thereby 11 ¦ and comprising a double cage magnet structure 16, although it is 12 ¦ to be understood that a single cage structure can be employed in 13 the practice of this invention.
14 Motor leads 17 can be passed under or through a magnet or between a magnet and the housing and then exit axially or 16~ radially from th~ housing through ~he rear or front of tha motor.
17 In the embodiment shown in Fig. 1~ leads 17 are disposed in a 18 groove 18 oP the magnet 19 and exit axially through the rear 19 ¦ housing assembly 13.
An armature assembly comprising planar windings 26 is 21 also located in the housing and supported on armature hub 24.
22 Bearings 20 and 21 are recessed within the motor 23 housing assemblies 13 and 14 by bearing journals within the 24 endcaps 13' and 14' of housing assemblies 13 and 14, r spectively, or within a separate spindle assembly 22 or combination th~reof. It is also to be understood that it is 27 1 within the purview of this invention to journal the bearings all 28 off the front housing assembly 13, as illustrated in Fig. 1, the 29 rear housing assembly 14, or to split them up between the front 3:0 and rear endcaps 13'~and 14l of the motor as shown in Fig. 2.
31 Still further, the bearings 20 and 21 are tucked within the 32 armature hub 24 and within the magnet inner diameters.
I
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2~3282~
1 Strengthening of the rear housing portion 14, if 2 desired or required, is accomplished by ~orming a rib or 3 depress.ion ~5 which falls into the magnet inner diameter 27, thus 4 eliminating the need for any protruding ribs or other metal forming. Another formed depression 28 located on the front 6 housing assembly 13 allows external load features to be located 7 1 closer to the ~ront of the motor, thus shortening the package 8 ¦ even further, as well as allowing for reduction of the overall 9 ¦ lPngth of sha~t 30.
10 ll In accordance with this invention, it is preferred 11 that a grommet 31 or bushing be provided on the motor housing to 12 insure that wire leads 17 are not pulled loose from their 13 conn~ction in the interior of the housing, the grommet being 14 located as an opening 32 in the rear housing assembly 14 at a point radially distant from the central axis of the motor.
16 In the design of D.C. motors, one key factor is the 17 motor torque constant (kt) which has units o~ torque per ampere.
18 It is desirable to increase the kt in order to reduce current 19 draw ~or a given torque. The kt is proportional to the magnetic flux density which, in turn, is proportional to the magnet 21 length. This relationship is modified by the introduction of 22 magnetic-flux leakage. As the magnet length increases, the gain 23 in per~ormance rolls off, and can even decrease if the magnet 24 length is too long. This occurs because the flux leakage increases as the magnet len~th increases. In Fig. 4, the graph 26 demons rates the kt o~ a motor of this invention and which also 27 shows the change in performance as the magnet length changes for 28 both single and double cag~ magnet structures.
29 As can be seen from re~erence to the graph, when the curva begins to become asymptotic for the singl.e cage structure, 31 the double cage structure for the same individual magnet length 32 shows improved psrformance in kt~ This happ~ns because the flux 1, 2~282~;
1 leakage for double cage structures is less than for single cage 2 structures when comparing equivalent total magnet lengths.
3 Consequently, higher power can be achieved and it is more 4 ¦ magnetically efficient to use two individual ~agnets (double , cage) across an air gap rather than a sinyle magnet of equal 6 1 length for the same gap. Thus, while it is within the purview of, 7 ¦ this invention to employ a single cass structure, a double cage ~tructure is preferredO
¦ An additional advantage of a double cage structure is 1 that it permits interior motor components, such as the bsaring 11 ~ and armature hubs, to be packaged within the inner diameter space 12 1 of the magnet, thus allowing the effective overall package length 13 ¦ to be reduced even further.
14 ¦ An additional advantage is obtained by positioning the ! brush assemblies on the output shaft side of a motor in 16 ~ accordance with this invention, since this reduces effective 17 motor lenyth by eliminating rear protrusio~s located radially 18 ~eyond the motor center line. The shift of the brush length 19 ¦ protrusion to the front side of the housing in many applica~ions ¦ does not affect the units ef~ective length because, in such 21 applications, th~ brushes can be tucked inside the component that 22 is mounted on the shaft~ An excellent example o~ this advantage 23 is illustrated in Fig. 3 where the motor of this invention is 24 mounted within the hub portion 33 of a fan 34.
While it is preferred to provide a groove, as mentioned' : 26 above, either within or under the magnet in which the motor leads -27 17 are disposed, it is within the purview of the invention that 28 th~ leads 17 can also b~ passed between adjacent magnet poles.
29 The leads are then passed outside the motor radially through the motor case or axially through the rear motor case. While either 31 construction may b~ utilized to pass the l~ads 17 to the exterior, 32 ¦ of the motor case, or housing, radial disposi~ion~ as described 2~3282~
1 above, is preferred, axial disposition being more difficult 2 because leads must pass across the rotating armature, thus 3 requiring other provisions in the motor housing, such as a formed 4 depres~ion or a machined channel (not shown). This will require strain relieving of some type, either mechanical or adhesive in 6 order to insure that the leads are not displaced from their 7 connection.
8 It is also within the purview of this invention to 9 employ a wide variety o~ known brush and spring urged assemblies in a motor o~ this invention, such as constant force brush and 11 spring urged assemblies provided with constant force springs, or 12 brush and spring urged assemblies utilizing helical, torsional or 13 flat springs. In addition, single cage magnet structures offer 14 shorter packaging. On the other hand, for the reasons mentioned above, the same given magnetic material will provide a reduced 16 power output. Consequently, although single caged magnetic 17 structures may be employed in the motor of this invention, the 18 double cage magnet structures are preferred.
19 In addition to the advantages men~ionéd above, the motor of this invention is further advantageous in that it 21 provides a ~mall package which permits efficient use of space.
22 The motor is relatively light in weight and has a low rurrent 23 draw and is further advantageous in that it can be employed with 24 other elements, such as a fan to provide a small bu~ useful pack~ye which can be utilized in limited spatial areas. Numerous 26 other advantages of th~ motor of this invention will be readily 27 apparent to those skilled in the art. For example, the motor may ~ be of materials which ~re utilized in presently know~ motors, yet 23 these materials may b~ shaped and formed so that they provide a small, neat, compact package which permits construction of an 31 efficient motor without substantially reducing the power output 32 thereof. More) er, the motor may be construc~ed from componen~s ,, l 2~3282~ 1 1 and materials which are readily available through commercial 2 channels. In addition, it is to b~ noted that the disposition of 3 the brushes on the output side of the motor and near the ¦ protruding portion of the shaft is advantageous since the 1 protruding portion of the shaft being longer than the height of 6 the brushes, prevents damage to the brushes if the motor i5 7 accidentally dropped.
8 It is to be understood that this invention is not to be 9 limited to the specific embodiments described hereinabove and that numerous variations of these emhodiments may be made without 11 departing from the spirit and scope of this inventionO
12 Accordingly, the invention is to be limited to the described 13 embodiments, except as defined in the appended Claims.
~1
16 In the design of D.C. motors, one key factor is the 17 motor torque constant (kt) which has units o~ torque per ampere.
18 It is desirable to increase the kt in order to reduce current 19 draw ~or a given torque. The kt is proportional to the magnetic flux density which, in turn, is proportional to the magnet 21 length. This relationship is modified by the introduction of 22 magnetic-flux leakage. As the magnet length increases, the gain 23 in per~ormance rolls off, and can even decrease if the magnet 24 length is too long. This occurs because the flux leakage increases as the magnet len~th increases. In Fig. 4, the graph 26 demons rates the kt o~ a motor of this invention and which also 27 shows the change in performance as the magnet length changes for 28 both single and double cag~ magnet structures.
29 As can be seen from re~erence to the graph, when the curva begins to become asymptotic for the singl.e cage structure, 31 the double cage structure for the same individual magnet length 32 shows improved psrformance in kt~ This happ~ns because the flux 1, 2~282~;
1 leakage for double cage structures is less than for single cage 2 structures when comparing equivalent total magnet lengths.
3 Consequently, higher power can be achieved and it is more 4 ¦ magnetically efficient to use two individual ~agnets (double , cage) across an air gap rather than a sinyle magnet of equal 6 1 length for the same gap. Thus, while it is within the purview of, 7 ¦ this invention to employ a single cass structure, a double cage ~tructure is preferredO
¦ An additional advantage of a double cage structure is 1 that it permits interior motor components, such as the bsaring 11 ~ and armature hubs, to be packaged within the inner diameter space 12 1 of the magnet, thus allowing the effective overall package length 13 ¦ to be reduced even further.
14 ¦ An additional advantage is obtained by positioning the ! brush assemblies on the output shaft side of a motor in 16 ~ accordance with this invention, since this reduces effective 17 motor lenyth by eliminating rear protrusio~s located radially 18 ~eyond the motor center line. The shift of the brush length 19 ¦ protrusion to the front side of the housing in many applica~ions ¦ does not affect the units ef~ective length because, in such 21 applications, th~ brushes can be tucked inside the component that 22 is mounted on the shaft~ An excellent example o~ this advantage 23 is illustrated in Fig. 3 where the motor of this invention is 24 mounted within the hub portion 33 of a fan 34.
While it is preferred to provide a groove, as mentioned' : 26 above, either within or under the magnet in which the motor leads -27 17 are disposed, it is within the purview of the invention that 28 th~ leads 17 can also b~ passed between adjacent magnet poles.
29 The leads are then passed outside the motor radially through the motor case or axially through the rear motor case. While either 31 construction may b~ utilized to pass the l~ads 17 to the exterior, 32 ¦ of the motor case, or housing, radial disposi~ion~ as described 2~3282~
1 above, is preferred, axial disposition being more difficult 2 because leads must pass across the rotating armature, thus 3 requiring other provisions in the motor housing, such as a formed 4 depres~ion or a machined channel (not shown). This will require strain relieving of some type, either mechanical or adhesive in 6 order to insure that the leads are not displaced from their 7 connection.
8 It is also within the purview of this invention to 9 employ a wide variety o~ known brush and spring urged assemblies in a motor o~ this invention, such as constant force brush and 11 spring urged assemblies provided with constant force springs, or 12 brush and spring urged assemblies utilizing helical, torsional or 13 flat springs. In addition, single cage magnet structures offer 14 shorter packaging. On the other hand, for the reasons mentioned above, the same given magnetic material will provide a reduced 16 power output. Consequently, although single caged magnetic 17 structures may be employed in the motor of this invention, the 18 double cage magnet structures are preferred.
19 In addition to the advantages men~ionéd above, the motor of this invention is further advantageous in that it 21 provides a ~mall package which permits efficient use of space.
22 The motor is relatively light in weight and has a low rurrent 23 draw and is further advantageous in that it can be employed with 24 other elements, such as a fan to provide a small bu~ useful pack~ye which can be utilized in limited spatial areas. Numerous 26 other advantages of th~ motor of this invention will be readily 27 apparent to those skilled in the art. For example, the motor may ~ be of materials which ~re utilized in presently know~ motors, yet 23 these materials may b~ shaped and formed so that they provide a small, neat, compact package which permits construction of an 31 efficient motor without substantially reducing the power output 32 thereof. More) er, the motor may be construc~ed from componen~s ,, l 2~3282~ 1 1 and materials which are readily available through commercial 2 channels. In addition, it is to b~ noted that the disposition of 3 the brushes on the output side of the motor and near the ¦ protruding portion of the shaft is advantageous since the 1 protruding portion of the shaft being longer than the height of 6 the brushes, prevents damage to the brushes if the motor i5 7 accidentally dropped.
8 It is to be understood that this invention is not to be 9 limited to the specific embodiments described hereinabove and that numerous variations of these emhodiments may be made without 11 departing from the spirit and scope of this inventionO
12 Accordingly, the invention is to be limited to the described 13 embodiments, except as defined in the appended Claims.
~1
Claims (16)
1. A flat D.C. printed circuit or stamped armature electric motor having a reduced length from front to rear comprising in combination:
a stationary housing having front and rear housing assemblies;
a rotatable shaft disposed in said stationary housing on the central axis of said motor and at least part of which protrudes through the front housing assembly of said stationary housing;
a stator assembly located in said stationary housing;
an armature assembly having planar windings located in said stationary housing;
means for mounting said assemblies and for rotating said armature assembly in a planar path past said stator assembly located in said stationary housing;
said stator assembly including a magnetic circuit assembly directing a magnetic field to said planar windings of said armature assembly in a direction normal to the plane of said armature;
commutation means, including a brush assembly, located in said stationary housing in the vicinity of said armature assembly on the same side thereof as said rotatable shaft protrudes through said stationary housing and for electrically energizing the planar windings of said armature assembly and imparting a rotary motion thereto past said stator assembly;
and wire means connected to said brush assembly and exiting said stationary housing at a point radially distant from the central axis of said motor and outside the outer diameter of said armature assembly and which pass through the interior of said stationary housing between the front housing assembly thereof and the rear housing assembly, whereby the disposition of said commutation means including said brush means results in a motor of reduced length from front to rear and which is adaptable to being disposed in a limited space configuration and in close tolerance with other objects which may be present in said limited space configuration.
a stationary housing having front and rear housing assemblies;
a rotatable shaft disposed in said stationary housing on the central axis of said motor and at least part of which protrudes through the front housing assembly of said stationary housing;
a stator assembly located in said stationary housing;
an armature assembly having planar windings located in said stationary housing;
means for mounting said assemblies and for rotating said armature assembly in a planar path past said stator assembly located in said stationary housing;
said stator assembly including a magnetic circuit assembly directing a magnetic field to said planar windings of said armature assembly in a direction normal to the plane of said armature;
commutation means, including a brush assembly, located in said stationary housing in the vicinity of said armature assembly on the same side thereof as said rotatable shaft protrudes through said stationary housing and for electrically energizing the planar windings of said armature assembly and imparting a rotary motion thereto past said stator assembly;
and wire means connected to said brush assembly and exiting said stationary housing at a point radially distant from the central axis of said motor and outside the outer diameter of said armature assembly and which pass through the interior of said stationary housing between the front housing assembly thereof and the rear housing assembly, whereby the disposition of said commutation means including said brush means results in a motor of reduced length from front to rear and which is adaptable to being disposed in a limited space configuration and in close tolerance with other objects which may be present in said limited space configuration.
2. A motor according to Claim 1, wherein the magnetic circuit assembly is a double cage structure.
3. A motor according to Claim 1, wherein the magnetic circuit assembly is a single cage structure.
4. A motor according to Claim 1, wherein the magnetic circuit assembly is provided with a groove and the wire means connected to the brush assembly and exiting the stationary housing at a point radially distant from the central axis of the motor is located in said groove before passing to the exterior of said stationary housing.
5. A motor according to Claim 1, wherein the wire means passes between magnet segments of the magnetic circuit assembly.
6. A motor according to Claim 1, wherein the wire means passes under the magnets of the magnetic circuit assembly.
7. A motor according to Claim 1, wherein the wire means exits the motor through the front housing assembly.
8. A motor according to Claim 1, wherein the wire means exits the motor through the rear housing assembly.
9. A motor according to Claim 1, wherein an opening having a grommet disposed therein is provided in the stationary housing at a point radially distant from the central axis of said motor and the wire means passes through said grommet to relieve any strain or excess force being applied thereto.
10. A motor according to Claim 1, wherein a depression is formed on the rear portion of the stationary housing.
11. A motor according to Claim 1, including bearings recessed within the stationary housing in bearing journals located within endcaps of said stationary housing.
12. A motor according to Claim 1, including an armature hub located within the magnet inner diameter of said magnetic circuit assembly and bearings located within said armature hub.
13. A motor according to Claim 1, wherein the commutation means are brush and spring urged assemblies.
14. A motor according to Claim 1, wherein the armature assembly circuit is a printed circuit.
15. A motor according to Claim 1, wherein the armature assembly circuit is a stamped circuit.
16. A flat D.C. printed circuit or stamped armature electric motor having a reduced length from front to rear comprising in combination:
a stationary housing having front and rear housing assemblies;
a rotatable shaft disposed in said stationary housing on the central axis of said motor and at least part of which protrudes through the front housing assembly of said stationary housing;
a stator assembly located in said stationary housing;
an armature assembly having planar windings located in said stationary housing;
means for mounting said assemblies and for rotating said armature assembly in a planar path past said stator assembly located in said stationary housing;
said stator assembly including a magnetic circuit assembly directing a magnetic field to said planar windings of said armature assembly in a direction normal to the plane of said armature;
commutation means, including a brush assembly, located in said stationary housing on the same side thereof as that portion of the rotatable shaft which protrudes therefrom for electrically energizing said planar windings of said armature assembly to impart a rotary motion thereto past said stator assembly;
and wire means connected to said brush assembly and exiting said stationary housing at a point radially distant from said central axis of said motor and outside the outer diameter of said armature assembly and which pass through the interior of said stationary housing between the front housing assembly thereof and said stator assembly, whereby the disposition of said commutation means including said brush assembly of said motor on the same side of said stationary housing as the portion of said shaft protruding therefrom results in a motor of reduced length from front to rear and which is adaptable to being disposed in a limited space configuration and in close tolerance with other objects which may be present in said limited space configuration.
a stationary housing having front and rear housing assemblies;
a rotatable shaft disposed in said stationary housing on the central axis of said motor and at least part of which protrudes through the front housing assembly of said stationary housing;
a stator assembly located in said stationary housing;
an armature assembly having planar windings located in said stationary housing;
means for mounting said assemblies and for rotating said armature assembly in a planar path past said stator assembly located in said stationary housing;
said stator assembly including a magnetic circuit assembly directing a magnetic field to said planar windings of said armature assembly in a direction normal to the plane of said armature;
commutation means, including a brush assembly, located in said stationary housing on the same side thereof as that portion of the rotatable shaft which protrudes therefrom for electrically energizing said planar windings of said armature assembly to impart a rotary motion thereto past said stator assembly;
and wire means connected to said brush assembly and exiting said stationary housing at a point radially distant from said central axis of said motor and outside the outer diameter of said armature assembly and which pass through the interior of said stationary housing between the front housing assembly thereof and said stator assembly, whereby the disposition of said commutation means including said brush assembly of said motor on the same side of said stationary housing as the portion of said shaft protruding therefrom results in a motor of reduced length from front to rear and which is adaptable to being disposed in a limited space configuration and in close tolerance with other objects which may be present in said limited space configuration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/615,983 US5144183A (en) | 1990-11-20 | 1990-11-20 | Flat motor of reduced length |
| US615,983 | 1990-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2032825A1 true CA2032825A1 (en) | 1992-05-21 |
Family
ID=24467568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002032825A Abandoned CA2032825A1 (en) | 1990-11-20 | 1990-12-20 | Flat motor of reduced length |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5144183A (en) |
| EP (1) | EP0486746A1 (en) |
| JP (1) | JPH04289757A (en) |
| CA (1) | CA2032825A1 (en) |
| DE (1) | DE4137503C2 (en) |
| GB (1) | GB2250141B (en) |
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-
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- 1990-11-20 US US07/615,983 patent/US5144183A/en not_active Expired - Lifetime
- 1990-12-20 CA CA002032825A patent/CA2032825A1/en not_active Abandoned
-
1991
- 1991-01-21 JP JP3021537A patent/JPH04289757A/en active Pending
- 1991-02-15 EP EP91102127A patent/EP0486746A1/en not_active Withdrawn
- 1991-02-18 GB GB9103373A patent/GB2250141B/en not_active Expired - Fee Related
- 1991-11-14 DE DE4137503A patent/DE4137503C2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9103373D0 (en) | 1991-04-03 |
| JPH04289757A (en) | 1992-10-14 |
| GB2250141B (en) | 1994-10-12 |
| DE4137503C2 (en) | 1996-12-12 |
| EP0486746A1 (en) | 1992-05-27 |
| DE4137503A1 (en) | 1992-05-21 |
| US5144183A (en) | 1992-09-01 |
| GB2250141A (en) | 1992-05-27 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Dead |