DE8025424U1 - ELECTRIC MACHINE - Google Patents

Description

Chr / Jä 22. B, I98Ö

fobert Bosch GnIbH ₁ , 7000 Stuttgart 1

jElectric machine
fitänd the technology

t) he invention is based on an electrical machine liach of the genre of the main claim · There are already machines with external rotors known in which the Cooling air is drawn axially through the fascia in a conventional manner. But this has the disadvantage that the winding heads are only insufficiently cooled.

Advantages of the invention

By guiding the cooling air according to the invention »I through the targeted flow onto the winding heads and the stator lamination stack both in the air gap area ils also achieve very good heat dissipation via the stator yoke.

Through the measures listed in the subclaims are advantageous developments and improvements of the machine specified in the main claim possible. It is particularly advantageous that the air guiding device is particularly thermally stressed fan-side winding heads cools well thanks to the targeted flow, although it is up to at this point the cooling air has already warmed up to a relatively high degree. The air guide is advantageously

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Partly interchangeable and thus it is possible to achieve a good adaptation of the air duct to different laminated ^{core lengths without any structural changes to the 1 bearing hub.} The grooving of the surface of the stator yoke surface is also advantageous, as a result of which even better heat dissipation is achieved.

drawing

An exemplary embodiment is shown in the drawing and explained in more detail in the following description <

Description of the embodiment

The generator comprises a shaft 103, which is mounted in bearings (not shown) within the cylindrical hub part of the end shield 12. A rotor bell 10 is mounted on the shaft 103 and comprises permanent magnets 102, fan blades and windows 9 on a rotor casing 101. A stator T, which carries a winding k, 8, is mounted inside the rotor 101, 102.

; Through openings in a cover 1, during operation of the generator air is sucked in. The air first passes over the heat sink 2, then through the air outlets 3 in the end shield 12 inside the generator. The cooling air flow now divides and flows through the air gap 5 between the stator 7 and the permanent magnet 102 and through the channels 6 between the inner part of the stator core 7 and the hub part of the end shield 12 therethrough. On the A funnel-shaped air guide part 31 is placed on the hub part 'of the end shield 12. One edge 105 of the air,

of the bearing plate 12, the other edge 112 eiweiter't towards the winding heads 8 This funnel-shaped curved shape wiid the “air flow is directed to the end windings 8. The cooling air flow then passes through the window 9 out of the machine again.

The air guide part 11 can be pressed onto the bearing plate 12 or a leg cast onto the bearing plate 12; The Lüftleitteil 11 may be interchangeable with vefschiedeneh generator types it _s 12 may be slidably Odei on the hub portion of the bearing 'can be used for different types have different shaping i

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η. 0554

Chr / Jä 22.8.198O

Robert Bosch GmbH, 7OOO Stuttgart 1

summary

A permanent magnet generator with a motor (ΙΟΙ) designed as an external rotor is proposed, in which the winding heads (h, 8) of the stator (7) are cooled by a targeted air flow. The air flow is directed onto the winding heads (k , 8) by an air guide part {11). Such a generator is particularly suitable for use in motor vehicles.

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Claims (1)

Chr / Jä 22.8.I98O Robert Bosch GmbH, 7000 Stuttgart 1 Expectations ί]. Permanent magnet generator, especially for motor vehicles, with a stator (7) »which carries a winding (h, 8), and a rotor (] 0J) which is in a bearing plate (32)
is rotatably mounted with air passages (3), characterized in that a tubular, to the stator
(7) concentric, air guide part (J]) is provided, which extends into the area of the stator 7 and
whose one edge (3Jl) to the bearing plate (J2) and
the other edge (J32) of which is funnel-shaped to form one of the winding heads (8). 2 * generator according to claim 1, characterized in that that the air guide part (3 1) rests with its one edge (111) on the bearing plate (J2). Si generator "according to claim 2, characterized in that that the end shield (J?) is cylindrical in the ίI <f IfII 14 * ** * «I IHI «III» I « Q Area of the stator (7) extends and one edge (111) of the air guide part (11) is essentially in the area the middle of the stator (?) is in contact with the end shield (12). U. generator according to one ö.nr preceding claims, characterized in that the distance between the air guide (11) and the air guide member Mi) facing surface of the stator (7) and the winding head (8) is substantially constant. 5. Generator according to one of the preceding claims, characterized in that the winding slots facing away from the Side of the stator yoke (7) is provided with axial grooves (61). 6. Generator according to one of the preceding claims, characterized in that the machine is an external rotor machine is designed that the stator (7) facing on del · its axis of rotational symmetry Side provided with axial channels (6) for air guidance and that the air guide part (11) in the area of this Channels (6 ") is arranged. γ, generator according to one of claims 3 to 6, since! in that the air guide member (11) to your aylinderföraigen _{| t} part _deg Lagersehilds is pressed (12) 8. Generator according to any one of claims 3 to Tj characterized in that the air guide part (11) is displaceable on the cylindrical part of the bearing plate (12) is.