Electric drive for a motor vehicle

Patent metadata

Field	Value
Publication number	US-11557939-B2
Application number	US-201816626739-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jun 26, 2017
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

An electric drive for a motor vehicle, in particular a fan drive, comprising an electric motor that includes a rotor which is mounted on a motor shaft so as to be able to rotate about a stationary stator as well as a driving part which is coupled to the rotor, and at least one electroconductive cover part for influencing and/or blocking interfering electromagnetic fields generated during operation of the electric motor.

First claim

The invention claimed is:

1. An electric drive for a motor vehicle comprising:
an electric motor including
a stationary stator,
a rotor configured to rotate relative to the stationary stator about an axis of rotation, the rotor configured to be coupled to a drive part in a non-rotatable manner, wherein the rotor is formed by a recoil pot provided with an inner circumference, an outer circumference, an end face, and permanent magnets disposed circumferentially about the inner circumference, and
a motor housing, wherein the motor housing at least partially accommodates the stator and/or the rotor; and

an electrically conductive cover part configured to influence and/or block electromagnetic interference fields generated during operation of the electric motor,
wherein the cover part forms a rotor sleeve provided with a sleeve-like shell, wherein in an assembled state, the cover part is disposed on the outer circumference of the rotor,
wherein the sleeve-like shell includes an outer surface, facing away from the rotor, and a number of beads extending radially inward from the outer surface of the sleeve-like shell, the number of beads circumferentially disposed about the inner surface of the sleeve-like shell and configured to compensate for a radial clearance between the electrically conductive cover part and the outer circumference of the recoil pot,
wherein the sleeve-like shell includes an end face, an upper collar, and a number of retaining lugs, the end face configured to face the drive part in the assembled state, the upper collar arranged on the end face, the number of retaining lugs disposed circumferentially about the upper collar and bent radially inwards, wherein the number of retaining lugs are configured to provide non-rotatable attachment of the electrically conductive cover part to the end face of the recoil pot.

2. The electric drive of claim 1 , wherein the cover part is mounted to and in direct contact with the motor housing.

3. The electric drive of claim 1 , wherein the electrically conductive cover part has a pot base at one end, joined to the sleeve like shell, wherein the rotor is inserted at least partially into the electrically conductive cover part.

4. The electric drive of claim 1 , wherein the sleeve-type shell is at least substantially annular wherein one end of the sleeve like shell at least partially covers a rotating-field winding of the stator.

5. The electric drive of claim 4 , wherein the electrically conductive cover part—includes angled tabs integrally formed and extending radially inward from a periphery of a central annular opening defined by the cover part.

6. The electric drive of claim 5 , wherein the angled tabs are secured to the stator.

7. The electric drive of claim 1 , wherein the electrically conductive cover part is inserted into the motor housing.

8. A fan device for use in a motor vehicle, the fan device comprising:
a fan impeller including a hub;
an electric motor including
a stationary stator,
a rotor coupled to the hub and configured to rotate relative to the stator about an axis of rotation to rotate the fan impeller, the rotor formed by a recoil pot provided with an inner circumference, an outer circumference, an end face, and permanent magnets disposed circumferentially about the inner circumference and
a motor housing, wherein the motor housing at least partially accommodates the stator and/or the rotor; and

a rotor sleeve formed of an electrically conductive material configured to influence and/or block electromagnetic interference fields generated during operation of the electric motor, the rotor sleeve disposed on the outer circumference of the rotor and mounted to the hub,
wherein the rotor sleeve includes a number of beads formed on an outer surface of the rotor sleeve, facing away from the rotor, and radially inwardly extending towards the recoil pot, the number of beads are collectively configured to compensate for a radial clearance between the rotor sleeve and the outer circumference of the recoil pot,
wherein the rotor sleeve includes a number of retaining lugs bent radially inward from an upper portion of the rotor sleeve, the number of retaining lugs are configured to provide non-rotatable attachment of the rotor sleeve to the end face of the recoil pot.

9. The electric drive of claim 1 , wherein the electrically conductive cover part is formed separately from the stationary stator, rotor, and motor housing.

10. The electric drive of claim 5 , wherein the angled tabs are angled axially.

11. The fan device of claim 8 , wherein the rotor sleeve has a substantially annular shape.

12. An electric drive comprising:
an electric motor including a stator, a rotor, and a motor housing, wherein the rotor may be configured to rotate with respect to the stator or vice-versa and the motor housing receives at least portions of the stator and the rotor, wherein the rotor is formed by a recoil pot provided with an inner circumference, an outer circumference, an end face, and permanent magnets disposed circumferentially about the inner circumference; and
a cover formed of an electrically conductive material configured to mitigate electromagnetic interference fields generated during the operation of the electric motor, wherein the cover includes,
an annular sleeve including an inner surface and an outer surface, and
a retaining rim radially extending away from the outer surface of the annular sleeve, wherein the annular sleeve includes number of beads each radially and inwardly extending from the outer surface towards the recoil pot and configured to compensate for a radial clearance between the cover part and the recoil pot.

13. The electric drive of claim 12 , further comprising a fan and a hub, wherein the cover is fixed to the hub.

14. The electric drive of claim 13 , further comprising a pot base concentrically arranged and axially offset from the retaining rim.

15. The electric drive of claim 14 , further comprising a strut radially extending from the retaining rim to the pot base.

16. The electric drive of claim 15 , wherein the strut extends at least partially axially from the retaining rim.

17. The electric drive of claim 14 , wherein the pot base defines a plurality of elongated apertures.

18. The electric drive of claim 12 , wherein the annular sleeve includes a second number of beads and a contact element extending from the inner surface and disposed between the first number of beads and the second number of beads, wherein the contact element has a convex shape with respect to the inner surface and is configured to electrically contact the rotor or the stator.

19. The electric drive of claim 1 , wherein at least one of the number of retaining lugs defines an opening configured to receive a fastener to fix the sleeve like shell to the recoil pot.

Assignees

• Brose Fahrzeugteile

Inventors

• Ludwig Kevin
• Labat Sebastien
• Duppe Carsten
• Hermann Eugen

Classifications

• H02K11/012

  Shields associated with rotating parts, e.g. rotor cores or rotary shafts · CPC title

• H02K7/14 Primary

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• F01P2005/046

  with electrical pump drive · CPC title

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title