DE102015214118A1 - Electric central release and clutch for a vehicle with the electric central release - Google Patents

Abstract

The invention relates to an electrical Zentralausrücker (1) with an electric motor (2) comprising a rotatably mounted rotor (3), wherein the rotor (3) has a number of permanent magnets (14) and a stator (4), wherein the stator (4) has a number of stator teeth (6, 7), characterized in that the stator teeth (6, 7) with respect to the permanent magnets (14) of the rotor (3) arranged on the stator (4) rotated by an angle (15) are.

Description

The invention relates to an electrical Zentralausrücker with an electric motor having a rotatably mounted rotor, wherein the rotor has a number of permanent magnets and a stator, wherein the stator has a number of stator teeth. Furthermore, the invention relates to a clutch for a vehicle comprising the electrical Zentralausrücker.

From the prior art electrical Zentralausrücker with electric motors have long been known. The electric motors each have a stator with a plurality of coils. The coils in the stator are arranged coaxially to an axial longitudinal direction of the stator. In addition to a stator, each electric motor has a rotor rotatably mounted in the stator with permanent magnets to convert electrical energy into mechanical energy. In this case, a force which is exerted by a magnetic field on the current-carrying conductor of a coil, converted into a movement.

The permanent magnets in the rotor produce cogging torques which are also present during operation of the electric motors.

Cogging moments refer to a phenomenon of electric motors which have permanent magnets in the stator and a grooved rotor made of electric sheets, or vice versa, a grooved stator and a rotor with permanent magnets.

In electric motors which are grooved both in the stator and in the armature, cogging moments also occur during operation. By changing the air gap when changing from armature tooth to armature against the permanent magnet vary the magnetic resistance and thus the force on the armature. Cogging moments lead to fluctuating torques, i. to a restless run, especially at low speeds.

It is therefore the technical task to overcome the disadvantages of the prior art. Furthermore, the cogging torques are to be reduced while maintaining the same space in the electrical Zentralausrücker.

The object is achieved in particular by an electric Zentralausrücker with an electric motor having a rotatably mounted rotor, wherein the rotor has a number of permanent magnets and a stator, wherein the stator has a number of stator teeth, and wherein the stator teeth relative to the permanent magnets of the Rotor are arranged at an angle rotated on the stator.

By providing the stator with the rotated stator teeth, an electrical Zentralausrücker is provided in which a change in the air gap when changing from stator tooth to Statornut relative to the permanent magnet can be compensated. Thus, fluctuating torques are compensated, resulting in a smooth running of the rotor, especially at low speeds.

Preferably, the stator teeth are arranged rotationally symmetrically on the stator. Preferably, all the stator teeth are arranged parallel to one another on a lateral surface of the stator. Particularly preferably, the stator teeth are arranged orthogonal to the axial longitudinal direction of the stator.

Preferably, "rotated at an angle" means that all the stator teeth are inclined. All stator teeth have the same inclination.

Preferably, the stator has windings which are guided around the stator teeth separated by stator slots. Preferably, the stator has Statorzahnendisolierungen which are provided at both ends of the stator teeth. Preferably, the stator has a potting.

Preferably, parts of the stator are encapsulated by means of the encapsulation. The encapsulation with the stator teeth preferably forms the lateral surface of the stator.

Preferably, the electric motor is a brushless DC motor or a three-phase motor. Preferably, the electric motor is an external rotor. Particularly preferably, an external rotor is a design of a rotating electrical machine in which the stationary part, namely the stator, the machine is located inside and the moving part, namely the rotor, is enclosed.

In a further embodiment of the invention, the stator teeth are oriented in a longitudinal direction and the permanent magnets are oriented in an axial longitudinal direction of the stator, so that the angle is formed by the longitudinal direction of the stator teeth and the axial longitudinal direction.

In this case, the stator teeth extend in a longitudinal direction and the permanent magnets in an axial longitudinal direction of the stator.

In a further embodiment of the invention, the angle is in the range of greater than 0 ° to 30 °.

This allows cogging moments to be reduced in a simple manner.

In a further embodiment of the invention, the angle is in the range of 3 ° to 15 °.

This allows cogging moments to be reduced particularly effectively.

In another embodiment of the invention, the angle measures 3.75 °.

At an angle of 3.75 °, the best results have been achieved in experiments to significantly reduce the cogging torques.

In a further embodiment according to the invention, the stator teeth have the same width.

As a result, a uniform compensation of fluctuating torques can be achieved.

In a further embodiment according to the invention, the stator teeth have different widths.

The stator teeth preferably have equal lengths in their longitudinal direction. The stator teeth preferably have equal heights. Preferably, a stator tooth height extends in a radial direction of the stator.

Furthermore, the object is achieved in particular by a coupling for a vehicle having an electrical central release, as described above.

The invention will now be exemplified by figures. Show it:

1 FIG. 2 a schematic section through part of an electrical central release mechanism according to the invention, FIG.

2 a schematic view of a stator of the electrical Zentralausrückers invention 1 .

3 a schematic view of the stator 2 after a shedding,

4 another schematic view of the stator 3 and

5 another schematic view of the stator 3 ,

1 shows a schematic section through a portion of an electrical Zentralausrückers invention.

The electrical central release 1 has an electric motor 2 on. The electric motor 2 is designed as an external rotor. The electric motor is preferred 2 a brushless DC motor or a three-phase motor. The electric motor 2 has a rotatably mounted rotor 3 (Runner) and a stator 4 (Stand) on. Here is the stator 4 in the radial direction R of the electrical Zentralausrückers 1 inside the rotor 3 arranged.

The stator 4 is with a power supply (see 3 to 5 ) to generate a changing electromagnetic field in stator coils (not shown). The rotor 3 has permanent magnets for the magnetic interaction 14 on.

The stator 4 is preferably on the carrier component 12 rotatably trained. The rotor 3 is formed as a rotor pot and is in a radial direction R to a bearing 13 supported. The warehouse 13 is in the axial direction A of the electrical Zentralausrückers 1 arranged. The rotor 3 has a number of permanent magnets 14 on and the stator 4 has a number of stator teeth 6 . 7 on (see 2 ).

As a result of energization by the stator 4 learns the rotor 3 in operation, a rotation about a rotation axis Z. The stator 4 will be described in more detail below.

The operation of an electrical Zentralausrückers is assumed to be known and will not be explained in detail here. In addition, for example, on the WO2014 / 090248 A2 referenced, in which the operation of an electrical Zentralausrückers is explained in a coupling.

2 shows a schematic view of a stator of the electrical Zentralausrückers invention 1 .

The stator 4 has a number through stator slots 5 separate stator teeth 6 . 7 on. The stator teeth 6 . 7 have different widths. Here is a first stator tooth 6 wider than a second stator tooth 7 educated. Alternatively, all stator teeth 6 . 7 also have the same width. The length of the stator teeth 6 . 7 and the height of the stator teeth 6 . 7 are identical. The stator 4 has convolutions 9 on. The windings 9 are around the stator teeth 6 . 7 guided. Furthermore, the stator has 4 Statorzahnendisolierungen 8th on that to both ends of the stator teeth 6 . 7 are provided.

The stator teeth 6 . 7 are rotated at an angle and parallel to each other on the stator 4 arranged. The stator teeth 6 . 7 are oriented in a longitudinal direction L, as under 3 described in more detail.

3 shows a schematic view of the stator 2 after a shedding and in the 4 to 5 are more schematic views of the stator 3 shown.

The stator grooves 5 and the windings 9 are by means of a potting 10 shed. The stator teeth 6 . 7 form with the potting 10 a freed from bumps lateral surface of the rotor 4 out. Alternatively, the stator teeth 6 . 7 also be free or be sprayed. The under 2 described windings 9 run in the power supply 11 together.

The stator teeth 6 . 7 are at an angle 15 rotated and parallel to each other on the stator 4 arranged. The stator teeth 6 . 7 extend in the longitudinal direction L. The permanent magnets (not shown) extend in an axial longitudinal direction A of the stator 4 , The angle 15 is from the longitudinal direction L of the stator teeth 6 . 7 and the axial longitudinal direction A formed. The angle 15 is preferably in the range of 3.0 ° to 4.5 ° at about 3.75 °.

By providing the stator with the rotated stator teeth, an electrical Zentralausrücker is provided in which a change in the air gap when changing from stator tooth to Statornut relative to the permanent magnet can be compensated. Thus, fluctuating torques are compensated, resulting in a smooth running of the rotor, especially at low speeds.

LIST OF REFERENCE NUMBERS

1

 electrical central release

2

 E-Motor

3

 rotor

4

 stator

5

 stator

6

 stator tooth

7

 stator tooth

8th

 Statorzahnendisolierung

9

 wrapping

10

 grout

11

 power

12

 support component

13

 camp

14

 permanent magnets

15

 angle

A

 axial longitudinal direction

L

 Longitudinal stator tooth

R

 radial direction

Z

 axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2014/090248 A2 [0038]

Claims (8)

Electric Central Release ( 1 ) with an electric motor ( 2 ) comprising a rotatably mounted rotor ( 3 ), wherein the rotor ( 3 ) a number of permanent magnets ( 14 ) and a stator ( 4 ), wherein the stator ( 4 ) a number of stator teeth ( 6 . 7 ), characterized in that the stator teeth ( 6 . 7 ) with respect to the permanent magnets ( 14 ) of the rotor ( 3 ) by an angle ( 15 ) turned on the stator ( 4 ) are arranged. Electric Central Release ( 1 ) according to claim 1, wherein the stator teeth ( 6 . 7 ) are oriented in a longitudinal direction (L) and the permanent magnets ( 14 ) in an axial longitudinal direction (A) of the stator ( 4 ) are oriented so that the angle ( 15 ) from the longitudinal direction (L) of the stator teeth ( 6 . 7 ) and the axial longitudinal direction (A) is formed. Electric Central Release ( 1 ) according to one of the preceding claims, wherein the angle ( 15 ) is in the range of greater than 0 ° to 30 °. Electric Central Release ( 1 ) according to one of the preceding claims, wherein the angle ( 15 ) is in the range of 3 ° to 15 °. Electric Central Release ( 1 ) according to one of the preceding claims, wherein the angle ( 15 ) Measures 3.75 °. Electric Central Release ( 1 ) according to one of the preceding claims, wherein the stator teeth ( 6 . 7 ) have the same width. Electric Central Release ( 1 ) according to one of claims 1 to 5, wherein the stator teeth ( 6 . 7 ) have different widths. Clutch for a vehicle having an electrical central release ( 1 ) according to one of the preceding claims.

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