Wheel motor

• US 8,035,270 B2
• Filed: 06/29/2010
• Issued: 10/11/2011
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: American AXLE & Manufacturing Incorporated (American AXLE & Manufacturing Holdings Incorporated)
• Original Assignee: American AXLE & Manufacturing Incorporated (American AXLE & Manufacturing Holdings Incorporated)
• Inventors: Adams, Herbert L., Syverson, Charles D., Marsh, Gregory A.
• Primary Examiner(s): Leung; Quyen
• Assistant Examiner(s): Mok; Alex W
• Application Number:
  US12/825,405
• Publication Number:
  US 20100327674A1
• Time in Patent Office: 469 Days
• Field of Search: 310/216.023, 310/179, 310/180, 310/44, 310/68
• US Class Current: 310/216.023
• CPC Class Codes: B60K 2007/0038 the motor moving together with the wheel axle
• CPC Class Codes: B60K 2007/0092 the motor axle being coaxial to the wheel axle
• CPC Class Codes: B60K 7/0007 the motor being electric
• CPC Class Codes: B60L 2220/44 Wheel Hub motors, i.e. integrated in the wheel hub
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 3/0061 relating to electrical machines
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 1/2795 the rotor consisting of two or more circumferentially positioned magnets
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 21/12 with stationary armatures and rotating magnets
• CPC Class Codes: H02K 21/22 with magnets rotating around the armatures, e.g. flywheel magnetos
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 7/14 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 Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A wheel motor can include a stator adapted to be coupled to a vehicle. The stator can include a body portion and a core extending radially outward from the body portion. A rotor can be disposed about the stator and can have a portion positioned radially outboard of and around the stator core. The rotor can include a plurality of magnets aligned with the stator core, and can be adapted to be coupled to a rotatable vehicle component. At least one winding element can be disposed circumferentially around the stator core, and a controller can be positioned in a pocket integrally formed in the stator body portion. The controller can be coupled to the at least one winding element and can be arranged to selectively provide a current supply to the at least one winding element to generate a magnetic flux to rotate the rotor relative to the stator.

Claims

1. A wheel motor, comprising:

a stator adapted to be coupled to a vehicle structure, the stator including a body portion and a core, said core extending radially outward from said body portion;

a rotor disposed about said stator and having a portion positioned radially outboard of and around said stator core, said rotor portion having a plurality of magnets aligned with said stator core, and said rotor adapted to be coupled to a rotatable vehicle component so as to be rotatable relative to the stator;

at least one winding element disposed circumferentially around said stator core; and

a controller positioned in a pocket integrally formed in the body portion of said stator;

said controller coupled to said at least one winding element and arranged to selectively provide a supply of current to said at least one winding element to generate a magnetic flux to rotate said rotor relative to said stator;

wherein said stator core comprises a U-shaped stator core, said U-shaped stator core having axially inboard an outboard radial surfaces spaced apart from each other and connected by a radially outermost axial surface, and wherein the rotor portion comprises a corresponding U-shape configured so as to receive the U-shaped stator core substantially within the U-shape of the rotor portion, the rotor U-shape portion having axially inboard and outboard radial surfaces spaced apart from each other and connected by a radially outermost axial surface.

2. The wheel motor of claim 1, further comprising a plurality of U-shaped magnets positioned circumferentially around the rotor U-shaped portion, each of the plurality of magnets being spaced circumferentially spaced apart from each other.

3. The wheel motor of claim 2, wherein the plurality of U-shaped magnets includes three discrete magnets.

4. The wheel motor of claim 2, wherein the stator core includes a plurality of radial slots positioned in the outermost axial surface and spaced apart circumferentially around the stator core, the plurality of slots arranged to receive a corresponding plurality of laminations, the plurality of laminations configured to radially extend from the stator core outermost axial surface so as to form a plurality of lamination slots.

5. The wheel motor of claim 4, wherein the at least one winding element includes three sets of winding elements, each set of winding elements arranged to be positioned around the stator core in every fourth lamination slot of the plurality of lamination slots such that a repeating pattern of the three sets of windings is established around the stator core, and each set of winding elements being configured to substantially conform to the U-shape of the stator core.

6. The wheel motor of claim 5, wherein each set of the three sets of winding elements are stacked in a double layer configuration in a respective lamination slot, and wherein the U-shaped rotor portion is disposed about the stator core having the three sets of winding elements stacked in the double layer configuration in the lamination slots such that there is an air gap between the winding elements and the plurality of rotor magnets.

7. The wheel motor of claim 6, wherein the controller includes three controllers, each of the three controllers positioned in a respective pocket integrally formed in the stator body and coupled to a respective set of the three sets of windings;

and

wherein each of the three controllers is configured to selectively supply current to a respective set of winding elements so as to generate a selectively positioned three-dimensional flux in the air gap to rotate the rotor relative to the stator.

8. The wheel motor assembly of claim 1, further comprising a sealing element, the sealing element having a body portion positioned on the stator and a sealing portion extending from the body portion, the sealing portion arranged to sealingly engage the rotor so as to maintain a watertight connection between the rotor and the stator.

9. The wheel motor assembly of claim 1, wherein the stator is disposed about a brake drum assembly such that the brake drum assembly is positioned radially inboard of the stator core.

10. The wheel motor assembly of claim 1, wherein the pocket is formed in the stator body and positioned radially inboard of the stator core and radially outboard of a mounting portion for mounting the stator to the vehicle structure.

11. The wheel motor assembly of claim 1, wherein the stator core comprises an insulated powdered metal stator core.

12. The wheel motor of claim 1, wherein the winding element includes one of a square and a rectangular shape in cross-section.

13. The wheel motor of claim 1, wherein the rotor includes a three-piece construction having a first portion substantially positioned on an axially inboard side of the wheel motor, a second portion positioned substantially at an axially outboard side of the wheel motor, and a third portion connecting the axially inboard and outboard portions.

14. The wheel motor of claim 13, wherein the axial outboard portion is adapted to be mounted to the wheel hub.

15. The wheel motor of claim 13, wherein the axially outboard portion includes an air circulating arrangement for cooling the wheel motor assembly, the air circulating arrangement comprising an inwardly angled annular recess having a plurality of apertures formed therein, each of the plurality of apertures being separated by a radial fin.

16. A wheel motor, comprising:

a stator adapted to be fixed to a wheel hub assembly, the stator including a body portion and a core formed from insulated powdered metal, the body portion having a mounting region adapted to engage the wheel hub assembly, the core having a U-shape and positioned radially outboard of the body portion, the U-shape including axially inboard and outboard radial surfaces spaced apart from each other and connected by a radially outermost axial surface, the radially outermost axial surface including a plurality of radial slots spaced apart from each other around a circumference of the stator core;

a rotor disposed about said stator and having a U-shaped portion positioned radially outboard of and around said U-shaped stator core, said rotor having a plurality of magnets positioned in a U-shaped configuration on a radially inner surface of the rotor U-shaped portion, said rotor adapted to be coupled to a rotatable portion of said wheel hub assembly so as to be rotatable relative to said stator;

a plurality of laminations positioned in the plurality of radial slots and arranged to extend radially outboard from the stator core outermost axial surface so as to form a plurality of lamination slots;

at least one winding element disposed circumferentially about the stator core so as to be positioned in each lamination slot, said at least one winding element substantially conforming to the U-shape of the stator core;

a controller positioned in a pocket integrally formed in the stator body portion, the pocket positioned radially inboard of the stator core and radially outboard of the mounting area, said controller coupled to the at least one winding element;

wherein the rotor U-shaped portion is disposed about the stator core U-shaped portion such that the respective axially inboard and outboard surfaces and the radially outboard surfaces of the rotor and stator are opposed from each other and there is an air gap between the plurality of U-shaped rotor magnets and the at least one winding element, and wherein said controller is arranged to selectively provide a supply of current to the at least one winding element to generate a three dimensional magnetic flux to rotate the rotor relative to the stator.

17. The wheel motor of claim 16, wherein the at least one winding element includes three pairs of winding elements, each pair of winding elements arranged be positioned circumferentially around the stator core in every fourth lamination slot of the plurality of lamination slots such that a repeating pattern of the three pairs of winding elements is established around the stator core, each pair of winding elements having a substantially square shape in cross section and positioned in a double layer stacked configuration in a respective lamination slot;

and

wherein the controller includes three controllers, each of the three controllers positioned in a respective pocket integrally formed in the stator body portion and coupled to a respective pair of the three pairs of winding elements, and each of the three controllers configured to selectively provide a supply of current to a respective pair of winding elements so as to generate a selectively positioned three dimensional flux in the air gap to rotate the rotor relative to the stator.

18. The wheel motor of claim 16, wherein the plurality of magnets includes three discrete magnets positioned in a U-shaped configuration on the inner surface of the rotor U-shaped portion and circumferentially spaced apart from each other.

19. The wheel motor of claim 16, wherein the rotor further comprises an axially outboard portion adapted to be mounted to the wheel hub assembly, said axially outboard portion including an air circulating arrangement for cooling the wheel motor assembly, the air circulating arrangement comprising an inwardly angled annular recess having a plurality of apertures formed therein, each of the plurality of apertures separated by a radial fin.