Rotor for a rotating electric machine and electric motor

• US 9,685,833 B2
• Filed: 01/22/2013
• Issued: 06/20/2017
• Est. Priority Date: 01/26/2012
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (Continental AG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Bulatow, Michael, Welke, Knut
• Primary Examiner(s): Lam, Thanh
• Application Number:
  US14/373,503
• Publication Number:
  US 20150076935A1
• Time in Patent Office: 1,610 Days
• Field of Search: 310 43, 310214-215
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/34 between conductors or between conductor and core, e.g. slot insulation
• CPC Class Codes: H02K 3/487 Slot-closing devices

Abstract

A rotor for a rotating electrical machine may include a number of pole teeth which carry a field winding, slots formed between the pole teeth, slot wedges provided in the slots, and separators arranged in the slots, the separators extending, starting from the slot wedges, between the windings in a direction toward a slot base.

Claims

1. A rotor for a rotating electric machine, the rotor comprising:

a plurality of pole teeth, each carrying a field winding;

a slot formed between each pair of adjacent pole teeth, such that for each slot, the field windings carried by a respective pair of adjacent pole teeth extends into that slot;

a slot wedge arranged in each slot; and

a separator arranged in each slot, the separator including two limbs each extending between the slot wedge and each of the respective field windings in the respective slot;

wherein the separator arranged in each slot (a) extends a generally radial direction from a respective slot wedge arranged in that slot toward a slot base and (b) extends between the field windings carried by the pair of adjacent pole teeth associated with that slot.

2. The rotor of claim 1, wherein each separator is formed from a non-magnetizable, electrically insulating material.

3. The rotor of claim 1, wherein each separator is formed from a plastic.

4. The rotor of claim 1, wherein each separator has a V shaped cross section.

5. The rotor of claim 1, wherein each separator is under prestress and press against the respective field winding in at least one contact-pressure region.

6. The rotor of claim 1, wherein each separator physically separates and electrically isolates the slot wedge from the field windings in the respective slot.

7. The rotor of claim 1, wherein each field winding is surrounded by a potting compound.

8. The rotor of claim 7, wherein the potting compound is also provided in a cavity defined between the slot wedge and the separator in each slot.

9. The rotor of claim 7, wherein a cavity defined between the slot wedge and the separator in each slot is free of the potting compound.

10. The rotor of claim 1, wherein each field winding is surrounded by an impregnating compound.

11. An electric motor, comprising:

a rotor comprising;

a plurality of pole teeth, each carrying a field winding;

a slot formed between each pair of adjacent pole teeth, such that for each slot, the field windings carried by a respective pair of adjacent pole teeth extends into that slot;

a slot wedge arranged in each slot; and

a separator arranged in each slot, the separator including two limbs each extending between the slot wedge and each of the respective field windings in the respective slot, insulating the slot wedge from the field windings;

wherein the separator arranged in each slot (a) extends a generally radial direction from a respective slot wedge arranged in that slot toward a slot base and (b) extends between the field windings carried by the pair of adjacent pole teeth associated with that slot.

12. The electric motor of claim 11, wherein each separator of the rotor is formed from a non-magnetizable, electrically insulating material.

13. The electric motor of claim 11, wherein each separator of the rotor is formed from a plastic.

14. The electric motor of claim 11, wherein each separator of the rotor has a V shaped cross section.

15. The electric motor of claim 11, wherein each separator of the rotor is under prestress and press against the respective field winding in at least one contact-pressure region.

16. The electric motor of claim 11, wherein each separator of the rotor physically separates and electrically isolates the slot wedge from the field windings in the respective slot.

17. The electric motor of claim 11, wherein each field winding of the rotor is surrounded by a potting compound.

18. The electric motor of claim 17, wherein the potting compound is also provided in a cavity defined between the slot wedge and the separator in each slot of the rotor.

19. The electric motor of claim 17, wherein a cavity defined between the slot wedge and the separator in each slot is free of the potting compound.

20. The electric motor of claim 11, wherein each field winding of the rotor is surrounded by an impregnating compound.