Fitting of stator body in bearing of rotary electrical machine, and rotary electrical machine comprising the fitting

• US 10,218,240 B2
• Filed: 12/04/2013
• Issued: 02/26/2019
• Est. Priority Date: 12/07/2012
• Status: Active Grant

• Current Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Original Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Inventors: Bonnici, Matthieu, Palleschi, Frederic, Pentecote, Delphine
• Primary Examiner(s): Mok, Alex W
• Application Number:
  US14/648,630
• Publication Number:
  US 20150318755A1
• Time in Patent Office: 1,910 Days
• Field of Search: 310 90, 310195, 29596
• CPC Class Codes: B23P 11/025 by using heat or cold
• CPC Class Codes: H02K 15/028 for fastening to casing or support, respectively to shaft or hub
• CPC Class Codes: H02K 15/062 Windings in slots; salient pole windings
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates
• CPC Class Codes: H02K 5/161 radially supporting the rotary shaft at both ends of the rotor H02K5/165, H02K5/167, H02K5/173 take precedence
• CPC Class Codes: H02K 9/227 Heat sinks
• CPC Class Codes: H05B 6/04 Sources of current
• CPC Class Codes: H05B 6/101 for local heating of metal pieces
• CPC Class Codes: Y10T 29/49011 Commutator or slip ring assembly

Abstract

The fitting of a stator (13) body (14) equipped with a winding (12) in an inner support surface (250) for a skirt (155) of a bearing (15) of a rotary electrical machine, such as an alternator or an alternator-starter of a motor vehicle, characterized in that the skirt (155) is heated locally by induction before fitting of the body (14) equipped with its winding (12) in the skirt (155). The invention also relates to a rotary electrical machine comprising a fitting of this type.

Claims

1. A fitting of a stator body (14) of a stator (13) of a rotary electrical machine, the rotary electrical machine including:

a bearing (15) having a skirt (155); and

the stator (13) mounted within the skirt (155) of the bearing (15) and having a stator body (14) equipped with a winding (12) within the stator body (14);

the stator body (14) is fitted in an inner support surface (250) for the skirt (155) of the bearing (15) of the rotary electrical machine, wherein the skirt (155) is heated locally by induction before fitting of the stator body (14) equipped with the winding (12) in the skirt (155).

2. The fitting according to claim 1, wherein the heating by induction is carried out by a solenoid which has at least one turn, and surrounds the skirt (155) at the level of the inner support surface (250) and without contact, such that the skirt is immersed in an electromagnetic field.

3. The fitting according to claim 2, wherein the inner support surface (250) of the skirt (155) is heated locally by induction.

4. The fitting according to claim 2, wherein, after heating by induction, the clamping between the inner support surface (250) and the outer periphery of the stator body (14) is equal to or more than −

0.1 mm.

5. The fitting according to claim 2, wherein the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator body (14).

6. The fitting according claim 1, wherein the inner support surface (250) of the skirt (155) is heated locally by induction.

7. The fitting according to claim 6, wherein, after heating by induction, the clamping between the inner support surface (250) and the outer periphery of the stator body (14) is equal to or more than −

0.1 mm.

8. The fitting according to claim 6, wherein the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator body (14).

9. The fitting according to claim 1, wherein, after heating by induction, the clamping between the inner support surface (250) and the outer periphery of the stator body (14) is equal to or more than −

0.1 mm.

10. The fitting according to claim 9, wherein the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator body (14).

11. The fitting according to claim 1, wherein the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator body (14).

12. The fitting according to claim 1, wherein the inner support surface (250) is formed at the level of a free end of the skirt (155).

13. The fitting according to claim 1, wherein an axial length (X) of the inner support surface (250) is more than half an axial length (L1) of the stator body (14).

14. A rotary electrical machine comprising a bearing (15) for receiving of a stator body (14) of a stator (13) with the fitting of the stator body according to claim 1.

15. The machine according to claim 14, wherein the bearing (15) for fitting of the stator body (14) is associated with another bearing (16) with a skirt (255) provided with a second inner support surface (260) for guiding of the stator body (14) with the presence of axial play between opposite free ends of the two opposite bearings (15, 16).

16. The machine according to claim 15, wherein an axial length of the second inner support surface (260) is equal to at least 10% of an axial length (L1) of the stator body (14).

17. The machine according to claim 14, wherein an axial length (L1) of the stator body (14) is between 26 and 42 mm.

18. The machine according to claim 14, wherein the stator body is equipped with a winding (12) which on both sides of the stator body has chignons with a pointed shape and a length of between 15 and 20 mm.