Drive element such as a driving wheel or a hoisting winch, the element comprising a synchronous motor

• US 6,661,137 B2
• Filed: 02/15/2002
• Issued: 12/09/2003
• Est. Priority Date: 02/20/2001
• Status: Expired due to Term

• Current Assignee: Moteurs Leroy Somer (Emerson Electric Company)
• Original Assignee: Moteurs Leroy Somer (Emerson Electric Company)
• Inventors: Gauthier, Pascal
• Primary Examiner(s): Lam, Thanh
• Application Number:
  US10/075,450
• Publication Number:
  US 20020121823A1
• Time in Patent Office: 662 Days
• Field of Search: 310/75.R, 310/67.R, 310/75.D, 310/156.01, 310/156-8-1, 180/65-- 6
• US Class Current: 310/75.00R
• CPC Class Codes: B60K 17/046 with planetary gearing having orbital motion
• CPC Class Codes: B60K 2007/0046 the motor moving together with the vehicle body, i.e. moving independently from 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 2220/14 Synchronous machines
• CPC Class Codes: B60L 2220/50 Structural details of electrical machines
• CPC Class Codes: B60Y 2200/15 Fork lift trucks, Industrial trucks
• CPC Class Codes: B62B 5/004 in wheels
• CPC Class Codes: B66D 1/12 incorporating electric motors
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 1/2773 consisting of tangentially magnetized radial magnets
• CPC Class Codes: H02K 11/00 Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection casings, enclosures or supports H02K5/00
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 21/22 with magnets rotating around the armatures, e.g. flywheel magnetos
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence
• CPC Class Codes: H02K 3/18 Windings for salient poles
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 5/1732 : radially supporting the rotary shaft at both ends of the rotor H02K5/1737 takes precedence
• CPC Class Codes: H02K 7/10 : Structural association with clutches, brakes, gears, pulleys or mechanical starters
• CPC Class Codes: H02K 7/1021 : Magnetically influenced friction brakes
• CPC Class Codes: H02K 7/116 : with gears
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

The present invention relates to a drive element such as a driving wheel for a goods-handling cart or the like, or such as a hoisting winch, the drive element comprising a wheel or a drum and an electric motor for rotating the wheel or the drum. The electric motor is a synchronous motor having a permanent-magnet rotor and a stator comprising teeth and respective individual windings on said teeth.

Claims

1. A driving wheel element, comprising:

a wheel; and

an electric motor for rotating the wheel, wherein the electric motor is a synchronous motor having a stator comprising teeth deprived of pole shoes and respective individual windings on said teeth and a permanent-magnet flux-concentrating rotor comprising pole pieces and magnets disposed radially between the pole pieces.

2. A driving wheel according to claim 1, wherein the wheel is coupled to the motor via stepdown gearing.

3. A driving wheel according to claim 2, wherein the gearing comprises a single stepdown stage.

4. A driving wheel according to claim 3, wherein the gearing comprises an epicyclic gear train.

5. A driving wheel according to claim 3, wherein the single stepdown stage has a stepdown ratio no greater than 15.

6. A driving wheel according to claim 5, wherein the stepdown ratio is in the range between 7 and 2.

7. A driving wheel according to claim 1, including a main casing comprising a large-diameter tubular wall and a small-diameter tubular wall interconnected by a transverse wall, the stator being received in the large diameter wall, which wall is secured to a first bearing-forming piece, the small-diameter tubular wall being secured to a second bearing-forming piece.

8. A driving wheel according to claim 7, wherein the second bearing-forming piece also constitutes a planet-carrier and has at least one pin rotatably carrying at least one planet wheel.

9. A driving wheel according to claim 8, wherein said planet-carrier carries three planet wheels, each planet wheel meshing with a gear cut in or fitted to the rotor shaft, and also with a ring gear of a support.

10. A driving wheel according to claim 8, wherein a rim supporting a tire is fixed to the support.

11. A driving wheel according to claim 10, wherein the support rotates via a bearing on the small-diameter tubular wall of the main casing.

12. A driving wheel according to claim 8, including a cap fitted in leaktight manner to the support.

13. A driving wheel element according to claim 7, including an electromagnetic brake that operates in the event of a power failure, the brake being fitted to said first bearing-forming piece, and comprising a disk fixed to a fluted end of the motor shaft.

14. A driving wheel according to claim 7, wherein the main casing is mounted to swivel about a vertical axis.

15. A driving wheel according to claim 7, wherein the motor drives a wheel and wherein the main casing is fixed in non-swivel manner to the chassis of the cart.

16. A driving wheel according to claim 1, wherein the rotor is coaxial with the tire of the wheel.

17. A hoisting winch, comprising:

a winch; and

an electric motor for rotating the winch, wherein the electric motor is a synchronous motor having a permanent-magnet rotor and a stator comprising teeth deprived of pole shoes and respective individual windings on said teeth.

18. A hoisting winch according to claim 17, wherein the rotor is a flux-concentrating rotor and has magnets disposed between pole pieces.

19. A hoisting winch according to claim 17, wherein the winch is coupled to the motor via stepdown gearing.

20. A hoisting winch according to claim 19,wherein the gearing comprises a single stepdown stage.

21. A hoisting winch according to claim 20, wherein the gearing comprises an epicyclic gear train.

22. A hoisting winch according to claim 20, wherein the single stepdown stage has a stepdown ratio no greater than 15.

23. A hoisting winch according to claim 22, wherein the stepdown ratio is in the range between 7 and 2.

24. A hoisting winch according to claim 17, including a main casing comprising a large-diameter tubular wall and a small-diameter tubular wall interconnected by a transverse wall, the stator being received in the large diameter wall, which wall is secured to a first bearing-forming piece, the small-diameter tubular wall being secured to a second bearing-forming piece.

25. A hoisting winch according to claim 24, wherein the second bearing-forming piece also constitutes a planet-carrier and has at least one pin rotatably carrying at least one planet winch.

26. A hoisting winch according to claim 25, wherein said planet-carrier carries three planet wheels, each planet wheel meshing with a gear cut in or fitted to the rotor shaft, and also with a ring gear of a support.

27. A hoisting winch according to claim 26, wherein the support rotates via a bearing on the small-diameter tubular wall of the main casing.

28. A hoisting winch according to claim 25, including a cap fitted in leaktight manner to the support.

29. A hoisting winch according to claim 24, including an electromagnetic brake that operates in the event of a power failure, the brake being fitted to said first bearing-forming teeth, and comprising a disk fixed to a fluted end of the motor shaft.

30. A driving wheel element, comprising:

a wheel;

a synchronous electric motor for rotating the wheel, said electric motor comprising;

a stator comprising teeth deprived of pole shoes and respective individual windings on said teeth; and

a permanent magnet rotor;

a stepdown gearing coupling the motor to the wheel, said stepdown gearing comprising;

an epicyclic gear train comprising;

a planet carrier, said planet carrier being in a fixed position relative to the stator;

at least one planet wheel rotating on the planet carrier; and

a ring being in a fixed position relative to the wheel, said at least one planet wheel intermeshing with the rotor and the ring to transmit rotation of the rotor to the wheel.