STATOR FOR AN ELECTRIC MACHINE

• US 20100019613A1
• Filed: 07/01/2009
• Published: 01/28/2010
• Est. Priority Date: 07/28/2008
• Status: Active Grant

• Current Assignee: FMC Technologies Incorporated (TechnipFMC, plc)
• Original Assignee: Direct Drive Systems Inc. (TechnipFMC, plc)
• Inventors: Saban, Daniel M., Guedes-Pinto, Paulo
• Granted Patent: US 8,415,854 B2
• Time in Patent Office: Days
• US Class Current: 310/216.86
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/165 Shape, form or location of the slots
• CPC Class Codes: H02K 1/278 Surface mounted magnets; Inset magnets
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• 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 3/487 Slot-closing devices
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 5/1285 of the submersible type
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

A stator core for a stator of an electrical machine includes an elongate stator yoke having an interior surface that defines an axial central opening through the stator yoke. The interior surface further defines a plurality of axial channels about a perimeter of the central opening. A plurality of stator teeth are retained in the plurality of axial channels and spaced apart from one another to define to define axial channels to receive windings of the stator.

Claims

1. A stator core for a stator of an electrical machine, comprising:

an elongate yoke stack comprising;

a plurality of yokes;

an axial central opening extending through the yoke stack; and

a plurality of axial channels formed in an interior surface of the central opening, at least one of the plurality of yokes formed at least partially from a material different from another of the plurality of yokes; and

a plurality of stator teeth retained in the plurality of axial channels, the plurality of stator teeth defining axial channels to receive windings of the stator.

2. The stator core of claim 1, wherein a plurality of the stator teeth comprise a material different than at least one of the plurality of yokes.

3. The stator core of claim 1, wherein at least one of the stator teeth comprise a plurality of tooth segments.

4. The stator core of claim 1, wherein at least one of the yokes is segmented.

5. The stator core of claim 4, wherein at least one of the yoke segments comprises a plurality of yoke segment laminations.

6. The stator core of claim 5, wherein one or more of the yoke segment laminations comprises a material different from one or more other yoke segment laminations.

7. The stator core of claim 3, wherein the plurality of tooth segments comprise a protrusion that mates to a receptacle in an adjacent tooth lamination.

8. The stator core of claim 3, wherein one or more of the tooth segments of one of the stator tooth at least partially comprises a material different from a material of one or more other tooth segments of the same stator tooth.

9. The stator core of claim 3, wherein at least one of the tooth segments comprises a plurality of tooth laminations.

10. The stator core of claim 9, wherein at least one of the plurality of tooth laminations of one of the tooth segments comprises a material different from one or more other tooth laminations of the same tooth segment or different tooth segments of the same stator tooth.

11. The stator core of claim 9, wherein for one or more of the stator teeth, the tooth laminations of the tooth segments alternate between one or more first tooth laminations comprising a first saturation flux density and one or more second tooth laminations comprising a second, higher saturation flux density.

12. The stator core of claim 9, wherein one or more of the stator teeth comprises a pattern of first saturation flux density tooth laminations and second, higher flux density tooth laminations along an axial length of the stator tooth, the pattern comprising a highest saturation flux about an axial end of the stator tooth.

13. The stator core of claim 9, wherein one or more of the stator teeth comprises a pattern of first saturation flux density tooth laminations and second, higher flux density tooth laminations along an axial length of the stator tooth, the pattern comprising a highest saturation flux density intermediate the axial length of the stator tooth.

14. The stator core of claim 1, wherein the plurality of stator teeth are interlocked with the elongate yoke stack.

15. A stator for an electrical machine, comprising:

a generally cylindrical yoke;

a plurality of teeth coupled to the yoke and extending substantially a length of the yoke; and

windings extending the length of the yoke between the teeth.

16. The stator of claim 15, wherein the plurality of teeth are retained in axial grooves extending axially along an interior periphery of the yoke.

17. The stator of claim 15, wherein the yoke comprises a first material and the teeth comprises a second, different material.

18. The stator of claim 15, wherein a saturation flux density of the teeth is greater than a saturation flux density of the yoke.

19. The stator of claim 18, wherein the saturation flux density of the teeth varies along a length of the teeth.

20. The stator of claim 19, wherein the saturation flux density of the teeth is lowest about an end of the stator.

21. The stator of claim 15, wherein the plurality of teeth are interlocked with the generally cylindrical yoke.

22. A method of making a stator core for an electric machine, comprising:

receiving a stator yoke;

receiving a plurality of stator teeth; and

assembling the plurality of stator teeth to the stator yoke.

23. The method of claim 22, further comprising assembling a plurality of stator tooth laminations together in forming a stator tooth, different of the stator tooth laminations comprising different materials.

24. The method of claim 23, wherein one or more of the stator tooth laminations comprise a material that is different from a material of the stator yoke.

25. The method of claim 23, further comprising assembling the stator tooth laminations of different materials in an order selected in relation to a desired temperature distribution across a length of the stator during operation.

26. The method of claim 22, wherein receiving a stator yoke comprises:

receiving a plurality yoke segment laminations;

combining the plurality of yoke segment laminations into a plurality of yoke segments;

combining the plurality of yoke segments into a plurality of stator yokes; and

combining the plurality of yokes into a yoke stack.