FITTING OF A STATOR BODY IN A BEARING OF A ROTARY ELECTRICAL MACHINE, AND ROTARY ELECTRICAL MACHINE COMPRISING FITTING OF THIS TYPE

• US 20150318755A1
• Filed: 12/04/2013
• Published: 11/05/2015
• 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
• Granted Patent: US 10,218,240 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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. 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, wherein the skirt (155) is heated locally by induction before fitting of the body (14) equipped with its winding (12) in the skirt (155).

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

3. Fitting according to claim 1, characterized in that the inner support surface (250) of the skirt (155) is heated locally by induction.

4. Fitting according to claim 1, characterized in that, after heating by induction, the clamping between the inner support surface (250) and the outer periphery of the stator (13) body (14) is equal to or more than −

0.1 mm.

5. Fitting according to claim 1, characterized in that the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator (13) body (14).

6. Fitting according to claim 1, characterized in that the inner support surface (250) is formed at the level of the free end of the skirt (155).

7. Fitting according to claim 1, characterized in that the axial length (X) of the inner support surface (250) is more than half the axial length (L1) of the stator (13) body (14).

8. Rotary electrical machine, in particular an alternator or an alternator-starter of a motor vehicle, characterized in that it comprises a bearing (15) for receipt of a stator (13) body (14) with fitting of the stator body according to claim 1.

9. Machine according to claim 8, characterized in that the bearing (15) for fitting of the stator body is associated with another bearing (16) with a skirt (255) provided with a second, inner support surface (260) for guiding of the stator (13) body (14) with the presence of axial play between the free ends opposite one another of the two bearings (15, 16).

10. Machine according to claim 9, characterized in that the axial length of the second support surface (260) is equal to at least 10% of the axial length (L1) of the stator body.

11. Machine according to claim 8, characterized in that the axial length (L1) of the stator body is between 26 and 42 mm.

12. Machine according to claim 8, characterized in that the stator body is equipped with a winding (12) which on both sides of the stator body has chignons with a pointed form and a length of between 15 and 20 mm.

13. Machine according to claim 8, characterized in that the bearing (15) comprises a skirt (155) which has tracks for heating by induction.

14. Fitting according to claim 2, characterized in that the inner support surface (250) of the skirt (155) is heated locally by induction.

15. Fitting according to claim 2, characterized in that, after heating by induction, the clamping between the inner support surface (250) and the outer periphery of the stator (13) body (14) is equal to or more than −

0.1 mm.

16. Fitting according to claim 3, characterized in that, after heating by induction, the clamping between the inner support surface (250) and the outer periphery of the stator (13) body (14) is equal to or more than −

0.1 mm.

17. Fitting according to claim 2, characterized in that the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator (13) body (14).

18. Fitting according to claim 3, characterized in that the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator (13) body (14).

19. Fitting according to claim 4, characterized in that the inner support surface (250) is formed by removing material, with formation of an axial stop shoulder for the stator (13) body (14).