Direct drive segmented generator

Patent metadata

Field	Value
Publication number	US-9455603-B2
Application number	US-201113883731-A
Country	US
Kind code	B2
Filing date	Nov 6, 2011
Priority date	Nov 5, 2010
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

The present invention relates an electrical machine comprising a plurality of stator segments; each segment has a plurality of electrical phase windings embedded in stator slots in a phase sequence, wherein the phase of the first slot of a segment is different from the phase of the first slot of an adjacent segment.

First claim

The invention claimed is:

1. An electrical machine comprising:
a plurality of stator segments arranged annularly to form a stator and comprising adjacent first and second stator segments, each of the plurality of stator segments forming a respective plurality of stator slots; and
a plurality of electrical phase windings comprising first and second electrical phase windings, the plurality of electrical phase windings arranged in a phase sequence in a circumferential direction along a circumference of the stator, each of the plurality of electrical phase windings embedded in a respective one of the plurality of stator slots of a respective one of the plurality of stator segments,
wherein a phase of the first electrical phase winding embedded in a stator slot of the first stator segment first encountered along the circumferential direction is different from a phase of the second electrical phase winding embedded in a stator slot of the second stator segment first encountered along the circumferential direction,
wherein each of the electrical phase windings embedded in the first stator segment is connected in series with a respective phase winding of a same electrical phase in the second stator segment.

2. The electrical machine according to claim 1 , wherein the phase sequence of the electrical phase windings is such that the electrical phase windings form a plurality of electrical phases distributed equally with a same phase angle between each of the plurality electrical phases.

3. The electrical machine according to claim 1 , wherein a number of electrical phase windings connected in series equals N times a number of electrical phase windings embedded in each of the plurality of stator segments, wherein N is an integer representing a number of the plurality of stator segments.

4. The electrical machine according to claim 3 , wherein P stator segments of the plurality of stator segments form a first set of electrical phases and Q stator segments of the plurality of stator segments form a second set of electrical phases, wherein the electrical phases of the first set are not aligned with the electrical phases of the second set, wherein P and Q are integers.

5. The electrical machine according to claim 1 , wherein a length of at least one of the plurality of electrical phase windings embedded in the first stator segment differs from a length of the other electrical phase windings embedded in the first stator segment.

6. The electrical machine according to claim 1 , wherein the plurality of electrical phase windings are embedded in the plurality of stator slots in a single layer.

7. The electrical machine according to claim 1 , wherein the plurality of electrical phase windings are embedded in the plurality of stator slots in a double layer.

8. The electrical machine according to claim 1 , wherein each of the plurality of stator segments comprises a respective plurality of stator teeth, wherein each of the plurality of electrical phase windings is a concentrated wound winding disposed around a single stator tooth of the plurality of stator teeth of the respective stator segment.

9. The electrical machine according to claim 1 , wherein each of the plurality of electrical phase windings is wound as a lap winding.

10. A method of assembling an electrical machine comprising a plurality of stator segments arranged annularly to form a stator, each stator segment comprising a respective yoke with a respective plurality of stator slots formed therein, the method comprising:
in a first stator segment of the plurality of stator segments, embedding a first plurality of electrical phase windings in the corresponding plurality of stator slots in a phase sequence in a circumferential direction along a circumference of the stator;
in an adjacent second stator segment of the plurality of stator segments, embedding a second plurality of electrical phase windings in the corresponding plurality of stator slots in the phase sequence; and
connecting each of the first plurality of electrical phase windings in series with a respective one of the second plurality of electrical phase windings of a corresponding electrical phase such that the electrical phase of an electrical phase winding embedded in a stator slot of the first stator segment first encountered along the circumferential direction is different from the electrical phase of an electrical phase winding embedded in a stator slot of the adjacent second stator segment first encountered along the circumferential direction,
wherein each of the electrical phase windings embedded in the first stator segment is connected in series with a respective phase winding of a same electrical phase in the second stator segment.

11. The method of assembling an electrical machine according to claim 10 , wherein a number of electrical phase windings connected in series equals N times a number of electrical phase windings embedded in each of the plurality of stator segments, wherein N is an integer.

12. The method of assembling an electrical machine according to claim 10 , wherein a length of at least one of the first plurality of electrical phase windings embedded in the first stator segment in a segment differs from a length of the other electrical phase windings embedded in the first stator segment.

13. The method of assembling an electrical machine according to claim 10 , wherein the electrical phase windings of the first and second pluralities of electrical phase windings are embedded in corresponding stator slots of the first and second stator segments in a single layer.

14. The method of assembling an electrical machine according to claim 10 , wherein the electrical phase windings of the first and second pluralities of electrical phase windings are embedded in corresponding stator slots of the first and second stator segments in a double layer.

Assignees

• Neumann Raphael
• Vestas Wind Sys As

Inventors

• Neumann Raphael

Classifications

• H02K3/12 Primary

  arranged in slots · CPC title

• H02K3/48

  in slots · CPC title

• H02K15/064

  Windings consisting of separate segments · CPC title

• H02K15/08

  Forming windings by laying conductors into or around core parts · CPC title

• H02K3/28 Primary

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