DE102019124189A1 - Powertrain device, electric motor and rotor - Google Patents

Abstract

The invention relates to a rotor (24) for an electric motor (10), having a rotor carrier (28) which can be rotated about an axis of rotation (14) and a rotor core (28) connected to the rotor carrier (28) via a toothing and rotatable about the axis of rotation (14). 26) with at least one first and second rotor lamination (38, 38.1, 38.2) arranged axially next to one another, several magnets (40) being distributed circumferentially in a corresponding magnet arrangement (42) in the first and second rotor lamination (38.1, 38.2). The invention also relates to an electric motor (10) for a drive train of a vehicle, having a stator (12) and a rotor (24) which can be rotated relative to the stator (12), as well as a drive train device for a vehicle, having a drive with an electric motor (10) ) to produce a drive torque on an output.

Description

The invention relates to a rotor according to the preamble of claim 1. Furthermore, the invention relates to an electric motor and a drive train device with an electric motor.

For example, an electric motor is off WO 2016/155718 A1 known. This describes an electric motor which has a rotor with a laminated rotor stack composed of several rotor laminations and a rotor carrier. The laminated rotor core is connected to the rotor arm via a cross interference fit and a tongue and groove connection. The laminated rotor core has two radially opposite springs which engage in respective grooves in the rotor arm. One of these two tongue and groove connections causes torque to be transmitted in the pushing direction and the other in the pulling direction.

The object of the present invention is to manufacture and build a rotor for an electric motor more cost-effectively and to make it more reliable and efficient. The torque ripple during operation of the rotor is intended to be reduced.

At least one of these objects is achieved by a rotor having the features according to claim 1. As a result, the magnet arrangement of the first rotor lamination can be rotated circumferentially with respect to the magnet arrangement of the second rotor lamination and this circumferential offset can be precisely set and unchanged via the first and second toothing. As a result, a reliable and constant reduction in torque ripple in the operation of the rotor can be realized. The rotor can be manufactured and assembled more cheaply. The rotor laminations do not heat up during assembly.

The rotor can be operated without current. The rotor lamination packet can have a plurality of rotor laminations axially lined up next to one another.

The magnets can be permanent magnets. The permanent magnets can be constructed from rare earth material. The magnets can be introduced into the respective rotor lamination in a non-positive, positive and / or cohesive manner.

The first toothing can be arranged on an inner circumference of the first rotor lamination. The second toothing can be arranged on an inner circumference of the second rotor lamination.

In a preferred embodiment of the invention, the first toothing is designed as a radial projection on the first rotor lamination, which positively engages in a radial recess in the rotor carrier. The radial projection can be made in one piece with the first rotor lamination. The radial projection can be punched from the first rotor lamination.

In a special embodiment of the invention, the second toothing is designed as a radial projection on the second rotor lamination, which positively engages in a radial recess in the rotor arm. The radial projection can be made in one piece with the second rotor lamination. The radial projection can be stamped from the second rotor lamination.

In a further special embodiment of the invention, the first and / or second toothing causes a torque transmission between the rotor core and the rotor carrier. In this way, a cost-effective torque transmission can be implemented. In addition, the material stresses that occur during torque transmission are reduced and better distributed. The stability of the rotor is increased.

The magnetic field acting on the rotor from outside can be converted into a torque on the rotor core via the magnets. The torque can be transmitted to the rotor arm via the first and / or second toothing.

In a preferred embodiment, the first and second teeth are aligned in the axial direction with respect to the rotor arm and, when the rotor is assembled, cause the first and second rotor laminations to be positioned with respect to one another and in each case with respect to the rotor carrier. As a result, the rotor can be assembled more easily and more quickly and the alignment of the first and second rotor laminations can be set more reliably.

In a special embodiment of the invention, the first rotor lamination has a total of two sets of teeth, on the one hand the first Toothing and a further toothing, both of which are offset from one another in a first circumferential direction by a first spacing angle and offset from one another in an opposite, second circumferential direction by a second spacing angle different from the first spacing angle. As a result, incorrect alignment of the respective rotor lamination with respect to the rotor arm when it is attached to the rotor arm can be prevented during assembly.

In a further special embodiment of the invention, the second rotor lamination has a total of two toothings, on the one hand the second toothing and a further toothing, both of which are offset from one another in a first circumferential direction by a first spacing angle and in an opposite second circumferential direction by a different spacing angle from the first spacing angle second spacing angles are offset from one another.

In a preferred embodiment of the invention, a difference between the first and second offset angles is less than 90 °, preferably less than 45 °, in particular less than 30 °. As a result, the torque ripple of the electric motor can be reduced while still providing a sufficient number of poles.

Furthermore, an electric motor for a drive train of a vehicle, having a stator and a rotor which is rotatable with respect to the stator and having at least one of the features specified above is proposed to solve at least one of the aforementioned objects.

The drive train can be a hybrid drive train. The electric motor can produce a drive torque for moving the vehicle. A further drive element can alternatively or additionally produce a further drive torque. The further drive element can be an internal combustion engine.

The electric motor can be a permanent magnet synchronous motor. The stator can convert the electrical energy introduced via the motor phase lines into a magnetic field acting on the rotor.

Furthermore, to solve at least one of the above objects, a drive train device for a vehicle, having a drive with an electric motor with at least one of the previously specified features for effecting a drive torque on an output is proposed.

The output can be a differential gear, a vehicle axle and / or a vehicle wheel.

Further advantages and advantageous configurations of the invention emerge from the description of the figures and the illustrations.

• 1: Eine räumliche Ansicht eines Elektromotors in einer speziellen Ausführungsform der Erfindung.
• 2: Einen Querschnitt durch den Elektromotor aus 1.
• 3: Eine räumliche Ansicht eines Rotorblechpakets eines Rotors in einer speziellen Ausführungsform der Erfindung.
• 4: Den Ausschnitt A aus 3 in einer vergrößerten Darstellung.
• 5: Einen Querschnitt durch einen Rotor in einer weiteren speziellen Ausführungsform der Erfindung.

The invention is described in detail below with reference to the figures. They show in detail:

• 1 : A three-dimensional view of an electric motor in a special embodiment of the invention.
• 2 : A cross-section through the electric motor 1 .
• 3 : A three-dimensional view of a laminated rotor core of a rotor in a special embodiment of the invention.
• 4th : Cut out section A. 3 in an enlarged view.
• 5 : A cross section through a rotor in a further special embodiment of the invention.

1 shows a three-dimensional view of an electric motor 10 in a special embodiment of the invention. The electric motor 10 is designed as a permanent magnet synchronous motor and has a stator 12th and one radially inward of the stator 12th around an axis of rotation 14th rotatably arranged rotor. The rotor is with a motor shaft 16 non-rotatably connected. The motor shaft 16 has a toothing 18th for connection to a connection component for transmitting the drive torque coming from the rotor.

The stator 12th is via three motor phase cables 20th supplied with electrical energy. In the stator 12th several coils made up of wire winding are arranged, via which the electrical energy is converted into a magnetic field acting on the rotor. The result in the operation of the electric motor 10 The resulting thermal energy is dissipated via an engine cooling system.

In 2 is a cross section through the electric motor 10 out 1 shown. The stator 12th includes multiple coils 22nd to convert the electrical energy into a rotating electromagnetic field on the radially inward of the stator 12th arranged rotor 24 . The rotor 24 is made from a laminated rotor core 26th and one with the rotor core 26th non-rotatably connected rotor arm 28 built up. The rotor arm 28 is with the motor shaft 16 non-rotatably connected, in particular made in one piece.

The electric motor 10 is designed as an internal rotor and has a motor flange 30th for attachment to a receiving component for receiving the electric motor 10 on. The motor flange 30th is with the stator 12th screwed and takes a first bearing on an inner circumference 32 , here a roller bearing through which the rotor arm 28 is stored. Another camp 34 , here a roller bearing, is on one of the motor flange 30th opposite side between the rotor arm 28 and one with the stator 12th screwed engine cover 36 arranged. The rotor arm 28 is through the first and second camp 32 , 34 opposite the stator 12th supported radially and axially.

That about the axis of rotation 14th rotatable laminated rotor core 26th comprises several rotor laminations arranged axially next to one another 38 that with the rotor arm 28 are non-rotatably connected via a toothing. The rotor sheets 38 are on an axially between the first and second bearings 32 , 34 lying section on the rotor arm 28 recorded.

3 shows a three-dimensional view of a rotor core 26th of a rotor 24 in a special embodiment of the invention. The three rotor laminations arranged axially next to one another 38 are in an installation position as if the toothing with the rotor arm, not shown here, had been implemented in a form-fitting manner.

In the rotor sheets 38 are each several magnets 40 in a corresponding magnet arrangement 42 Introduced distributed around the circumference. The magnets 40 are in the respective magnet recesses 44 in the respective rotor sheet 38 arranged. The magnets 40 can in the respective magnet recess 44 be introduced non-positively, positively and / or cohesively. The magnets 40 can be permanent magnets, for example made of rare earth material. Each of the magnets 40 in a rotor lamination 38 is opposite the neighboring magnet 40 arranged at a distance from the circumference.

A first rotor lamination 38.1 has at one with a first offset angle with respect to the magnet arrangement 42 twisted first circumferential position P1 a first interlocking Z1 for a positive connection with the rotor arm. A second rotor sheet 38.2 has at one with a second offset angle with respect to the magnet arrangement 42 twisted second circumferential position P2 a second toothing Z2 for a positive connection with the rotor arm. The first and second circumferential positions P1 , P2 are the same in relation to the rotor arm and in the axial direction, i.e. parallel to the axis of rotation 14th aligned.

The first and second offset angles, however, are used to align the magnet arrangements in a mutually rotated manner 42 of the first and second rotor lamination 38.1 , 38.2 different. This allows the magnet assembly 42 of the first rotor lamination 38.1 opposite the magnet arrangement 41 of the second rotor lamination 38.2 be offset circumferentially and this offset on the first and second teeth Z1 , Z2 precisely adjusted and maintained unchangeably. This enables a reliable and consistent reduction in torque ripple during operation of the rotor 24 be realized. The rotor 24 can be manufactured and assembled more cheaply. A heating of the rotor laminations 38 during assembly can be omitted.

The first interlocking Z1 is on an inner circumference of the first rotor lamination 38.1 and the second toothing Z2 is on an inner circumference of the second rotor lamination 38.2 arranged. The teeth Z1 , Z2 are made in one piece from the respective rotor sheet 38.1 , 38.2 designed as a radial projection. The radial projection is form-fitting with a corresponding radial recess in the rotor arm for torque transmission between the rotor core 26th and the rotor arm can be connected. As a result, a more cost-effective torque transmission can be implemented. In addition, the material stresses that occur during torque transmission are reduced in the rotor core 26th reduced and better distributed. The stability of the rotor 24 will be raised.

In 4th section A is off 3 shown in an enlarged view. The first rotor sheet 38.1 has a total of two circumferentially offset toothing, on the one hand the first toothing Z1 and another toothing Zn . The first interlocking Z1 and the further interlocking Zn are in a first circumferential direction R1 by a first distance angle WA1 offset from one another and in an opposite second circumferential direction R2 by one of the first distance angle WA1 different second spacing angles WA2 offset against each other.

This can result in incorrect alignment of the respective rotor lamination when assembling the rotor core 38 against the rotor arm can be prevented. The rotor sheet 38 can only through the first and further teeth in the circumferential direction Z1 , Zn take up the given position.

5 shows a cross section through a rotor 24 in a further special embodiment of the invention. The rotor 24 is through that on the rotor arm 28 attached rotor lamination package 26th set up that by the magnets 40 to transmit the released torque to a motor shaft. Here is the first rotor lamination 38.1 about the first toothing Z1 and the further interlocking Zn with the rotor arm 28 positively and non-rotatably connected.

The first interlocking Z1 of the first rotor lamination 38.1 is about the first offset angle W1 compared to the magnet arrangement 42 of the first rotor lamination 38.1 twisted and at the first circumferential position P1 arranged. The second interlocking Z2 of the second rotor lamination shown in dashed lines 38.2 is about the second offset angle W2 compared to the magnet arrangement 42 of the second rotor lamination 38.2 twisted and at the second circumferential position P2 arranged. The first and second circumferential positions P1 , P2 are in relation to the rotor arm 28 the same and aligned in the axial direction. The first and second offset angles W1 , W2 however, for mutually rotated alignment of the Magnet arrangements 42 of the first and second rotor lamination 38.1 , 38.2 different.

The first interlocking Z1 is on an inner circumference of the first rotor lamination 38.1 and the second toothing Z2 is on an inner circumference of the second rotor lamination 38.2 arranged. The teeth Z1 , Z2 are made in one piece from the respective rotor sheet 38.1 , 38.2 designed as a radial projection and in an axially continuous radial recess 46 in the rotor arm 28 positively recorded.

List of reference symbols

10

Electric motor

12th

stator

14th

Axis of rotation

16

Motor shaft

18th

Interlocking

20th

Motor phase lead

22nd

Kitchen sink

24

rotor

26th

Rotor core

28

Rotor arm

30th

Motor flange

32

camp

34

camp

36

Engine cover

38

Rotor lamination

38.1

first rotor sheet

38.2

second rotor sheet

40

magnet

42

Magnet arrangement

44

Magnet recess

46

Recess

P1

first circumferential position

P2

second circumferential position

R1

first circumferential direction

R2

second circumferential direction

W1

first offset angle

W2

second offset angle

WA1

first spacing angle

WA2

second spacing angle

Z1

first toothing

Z2

second toothing

Zn

further gearing

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• WO 2016/155718 A1 [0002]

Claims (10)

A rotor (24) for an electric motor (10), comprising a rotor carrier (28) rotatable about an axis of rotation (14) and a rotor core (26) which is connected to the rotor carrier (28) via a toothing and rotates about the axis of rotation (14) with at least a first and second rotor lamination (38, 38.1, 38.2) arranged axially next to one another, several magnets (40) being distributed circumferentially in a corresponding magnet arrangement (42) in the first and second rotor lamination (38.1, 38.2), characterized in that the first rotor lamination (38.1) at a first circumferential position (P1) rotated circumferentially with a first offset angle (W1) relative to the magnet arrangement (42), a first toothing (Z1) for a positive connection with the rotor arm (28) and the second rotor lamination (38.2) at a second circumferential position (P2) rotated circumferentially with a second offset angle (W2) relative to the magnet arrangement (42), a second toothing (Z2) for a form-fitting connection with the rotor arm (28), the first and second circumferential positions (P1, P2) being the same with respect to the rotor arm (28) and the first and second offset angles (W1, W2) for the mutually rotated alignment of the magnet assemblies (42) of the first and second rotor lamination (38.1, 38.2) are different. Rotor (24) Claim 1 , characterized in that the first toothing (Z1) is designed as a radial projection on the first rotor lamination (38.1) which positively engages in a radial recess (46) in the rotor carrier (28). Rotor (24) Claim 1 or 2 , characterized in that the second toothing (Z2) is designed as a radial projection on the second rotor plate (38.2) which positively engages in a radial recess (46) in the rotor carrier (28). Rotor (24) according to one of the preceding claims, characterized in that the first and / or second toothing (Z1, Z2) causes a torque transmission between the rotor core (26) and the rotor carrier (28). Rotor (24) according to one of the preceding claims, characterized in that the first and second teeth (Z1, Z2) are aligned in the axial direction with respect to the rotor arm (28) and a positioning of the first when assembling the rotor (24) and the second rotor lamination (38.1, 38.2) to one another and in each case to the rotor arm (28). Rotor (24) according to one of the preceding claims, characterized in that the first rotor plate (38.1) has a total of two teeth, on the one hand the first toothing (Z1) and another toothing (Zn), both of which in a first circumferential direction (R1) a first spacing angle (WA1) offset from one another and offset from one another in an opposite second circumferential direction (R2) by a second spacing angle (WA2) different from the first spacing angle (WA1). Rotor (24) according to one of the preceding claims, characterized in that the second rotor plate (38.2) has a total of two toothings, on the one hand the second toothing (Z2) and another toothing (Zn), both of which in a first circumferential direction (R1) a first spacing angle (WA1) offset from one another and offset from one another in an opposite second circumferential direction (R2) by a second spacing angle (WA2) different from the first spacing angle (WA1). Rotor (24) Claim 6 or 7th , characterized in that a difference between the first and second offset angles (WA1, WA2) is less than 90 °. Electric motor (10) for a drive train of a vehicle, having a stator (12) and a rotor (24) which is rotatable relative to the stator (12) according to one of the preceding claims. Drive train device for a vehicle, comprising a drive with an electric motor (10) according to Claim 9 for effecting a drive torque on an output.

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