Rotary electric machine having wedges to support salient poles of a rotor

Patent metadata

Field	Value
Publication number	US-11245305-B2
Application number	US-201916656857-A
Country	US
Kind code	B2
Filing date	Oct 18, 2019
Priority date	Oct 19, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A rotary electric machine including a rotor having salient poles, each salient pole comprising a pole body surrounded by at least one coil, and at least one pair of wedges comprising a first wedge positioned against the coil of a first salient pole and a second wedge positioned against the coil of a second salient pole consecutive with the first. The first and second wedges are able to move in the inter-pole space with respect to one another along the longitudinal axis of the rotor, and each having at least one contact surface, the contact surface or surfaces of the first wedge being configured to come into contact with the contact surface or surfaces of the second wedge as one wedge is moved longitudinally with respect to the other in such a way that the movement of one wedge with respect to the other induces a pressing of these wedges against the coils so as to hold the coils of the first and second salient poles respectively against the pole bodies of the first and second salient poles.

First claim

The invention claimed is:

1. A rotary electric machine comprising a rotor comprising:
salient poles, each salient pole comprising a pole body surrounded by at least one coil,
at least one pair of wedges comprising a first wedge positioned against the coil of a first salient pole and a second wedge positioned against the coil of a second salient pole consecutive with the first,
the first and second wedges being able to move in an inter-pole space with respect to one another along the longitudinal axis of the rotor, and each having at least one contact surface, the contact surface or surfaces of the first wedge being configured to come into contact with the contact surface or surfaces of the second wedge as one wedge is moved longitudinally with respect to the other in such a way that the movement of one wedge with respect to the other induces a pressing of these wedges against the coils so as to hold the coils of the first and second salient poles respectively against the pole bodies of the first and second salient poles,
the contact surfaces of the first and second wedges exhibiting gradients with respect to the longitudinal axis of the rotor.

2. The machine according to claim 1 , wherein the angle of the gradients with respect to the longitudinal axis of the rotor is less than the angle defining the cone of friction based on the grip of the material of which the wedges are made.

3. The machine according to claim 1 , wherein the contact surfaces of the first and second wedges are notched, notably comprising nonreturn reliefs.

4. The machine according to claim 1 , wherein the first and second wedges comprise, or consist of, a metallic material, notably aluminum or an aluminum alloy, or an electrically insulating material, notably a thermoplastic or a reinforced thermoplastic.

5. The machine according to claim 1 , wherein the machine comprises an electrically insulating material, notably in the form of a thin sheet, placed between the wedges and the coils on which they are positioned.

6. The machine according to claim 1 , wherein the first and second wedges each comprise an inner part which is configured to press against the coil and an outer part which extends into the opening between two consecutive salient poles, each said inner and outer parts meeting at one end, forming an angle between them, and the contact surfaces being situated at the free ends of said parts.

7. The machine according to claim 6 , wherein each salient pole comprises a pair of pole tips situated on either side of said salient pole, and the end of the wedge being configured to come to bear under the pole tips after the wedges have been mounted in the corresponding inter-pole space.

8. The machine according to claim 6 , wherein the inner part comprises a body extending along a plane P and is prolonged by a protrusion that exhibits a break in gradient with the plane P, the protrusion exhibiting an upper surface.

9. The machine according to claim 6 , wherein the outer part comprises a body comprising a flat defining a lower surface.

10. The machine according to claim 6 , wherein the inner and outer parts are ribbed and comprise stiffening ribs.

11. The machine according to claim 6 , wherein the inner and outer parts of one wedge each defines contact surfaces for contact with the other wedge of the pair.

12. The machine according to claim 1 , wherein the first and second wedges comprise collaborating reliefs contributing to guiding said first and second wedges in their movement relative to one another.

13. The machine according to claim 12 , wherein the collaborating reliefs of one wedge comprise tabs, notably said tabs extending forward of the contact surfaces and positioned to slide on the upper face of the protrusion and the lower face of the flat of the other wedge during the longitudinal movement of the wedge with respect to the other one.

14. The machine according to claim 1 , wherein the first and second wedges are identical and positioned top to toe in the inter-pole space.

15. The machine according to claim 1 , wherein the machine comprises in each inter-pole space, several pairs of wedges distributed along the longitudinal axis of the rotor.

16. A method for manufacturing a rotor of a rotary electric machine, comprising salient poles, each salient pole comprising a pole body surrounded by at least one coil, the rotor comprising at least a first wedge positioned against the coil of a first salient pole and a second wedge positioned against the coil of a second salient pole consecutive with the first, the first and second wedges each having at least one contact surface, the contact surface of surfaces of the first wedge being configured to come into contact with the contact surface or surfaces of the second wedge as one wedge is moved longitudinally with respect to the other, the contact surfaces of the first and second wedges exhibiting gradients with respect to the longitudinal axis of the rotor, and in which clamping of the coils of the first and second salient poles against the pole bodies of the first and second salient poles respectively is performed by moving the first wedge with respect to the second wedge in an inter-pole space along the longitudinal axis of the rotor.

17. The method according to claim 16 , wherein the movement of the first wedge with respect to the second wedge in the inter-pole space is performed using a tool that allows controlled clamping of the coils of the first and second salient poles against the pole bodies of the first and second salient poles respectively.

18. A rotary electric machine comprising a rotor comprising:
salient poles, each salient pole comprising a pole body surrounded by at least one coil,
at least one pair of wedges comprising a first wedge positioned against the coil of a first salient pole and a second wedge positioned against the coil of a second salient pole consecutive with the first,
the first and second wedges being able to move in an inter-pole space with respect to one another along the longitudinal axis of the rotor, and each having at least one contact surface, the contact surface or surfaces of the first wedge being configured to come into contact with the contact surface or surfaces of the second wedge as one wedge is moved longitudinally with respect to the other in such a way that the movement of one wedge with respect to the other induces a pressing of these wedges against the coils so as to hold the coils of the first and second salient poles respectively against the pole bodies of the first and second salient poles,
the first and second wedges each comprising an inner part which is configured to press against the coil and an outer part which extends into the opening between two consecutive salient poles, each said inner and outer parts meeting at one end, forming an angle between them, and the contact surfaces being situated at the free ends of said parts.

19. A rotary electric machine comprising a rotor comprising:
salient poles, each salient pole comprising a pole body surrounded by at least one coil,
at least one pair of wedges comprising a first wedge positioned against the coil of a first salient pole and a second wedge positioned against the coil of a second salient pole consecutive with the first,
the first and second wedges being able to move in an inter-pole space with respect to one another along the longitudinal axis of the rotor, and each having at least one contact surface, the contact surface or surfaces of the first wedge being configured to come into contact with the contact surface or

Assignees

• Leroy Somer Moteurs

Inventors

• Vohlgemuth Patrick

Classifications

• H02K15/13

  Applying slot closure means in the cores; Manufacture of slot closure means · CPC title

• H02K1/24 Primary

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title

• H02K1/26

  Rotor cores with slots for windings · CPC title

• H02K3/48

  in slots · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title