ROTATING ELECTRICAL MACHINE WINDING, ROTATING ELECTRICAL MACHINE, AND SEMICONDUCTIVE INSULATING COMPONENT USED THEREIN

• US 20080106157A1
• Filed: 11/07/2007
• Published: 05/08/2008
• Est. Priority Date: 11/07/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tanaka, Nobuaki, Suzuki, Keiji, Higashimura, Yutaka, Kurahara, Yoshimi, Onoda, Mitsuru, Miyao, Hiroshi
• Granted Patent: US 7,804,218 B2
• Time in Patent Office: Days
• US Class Current: 310/45
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H02K 3/40 for high voltage, e.g. affording protection against corona discharges

Abstract

When a rotating electrical machine winding is inserted into a slot with a protective insulation intervening between them, a semiconductive insulating layer is lap-wound between an interlayer insulating layer of the rotating electrical machine winding and the protective insulation, the semiconductive insulating layer being formed by center-folding a continuous semiconductive sheet in the longitudinal direction. A thermal stress relaxation layer is provided inside the center-folded continuous semiconductive sheet so that thermal stress exerted in thickness direction of the insulating layers is absorbed.

Claims

1. A rotating electrical machine winding in which a semiconductive insulating layer is formed by wrapped taping a semiconductive insulating component, wherein the semiconductive insulating component comprises a continuous semiconductive sheet that is center-folded in a longitudinal direction thereof and a thermal stress relaxation layer disposed inside the center-folded continuous semiconductive sheet.

2. The rotating electrical machine winding according to claim 1, wherein the continuous semiconductive sheet is formed by coating insulation resin in which carbon filler are mixed to an insulating component.

3. The rotating electrical machine winding according to claim 2, wherein the thermal stress relaxation layer is a non-adhesive layer.

4. The rotating electrical machine winding according to claim 3, wherein the non-adhesive layer is a coating layer formed by coating silicone resin to the insulating component.

5. The rotating electrical machine winding according to claim 3, wherein the non-adhesive layer is a coating layer formed by coating fluorocarbon resin to the insulating component.

6. The rotating electrical machine winding according to claim 2, wherein the thermal stress relaxation layer is an elastic body.

7. The rotating electrical machine according to claim 1, in which a rotating electrical machine winding is formed by providing a groundwall insulating layer around the outer periphery of a coil conductor, the rotating electrical machine winding is inserted into a slot formed in a rotating electrical machine core with a protective insulation intervening therebetween, a wedge is inserted on an opening side of the slot so as to fix the rotating electrical machine winding, insulation resin is grobal impregnated into the rotating electrical machine winding and rotating electrical machine core, and the impregnated insulation resin is cured;

wherein;

a semiconductive insulating layer is formed between the groundwall insulating layer and the protective insulation, the semiconductive insulating layer comprising a center-folded continuous semiconductive sheet disposed in a longitudinal direction thereof and a semiconductive sheet lap-wound outside the center-folded continuous semiconductive sheet; and

a thermal stress relaxation layer is formed inside the center-folded semiconductive sheet, the thermal stress relaxation layer relaxation thermal stress exerted in a thickness direction of the insulating layers.

8. The rotating electrical machine winding according to claim 7, wherein the continuous semiconductive sheet is formed by coating insulation resin in which carbon filler are mixed to an insulating component.

9. The rotating electrical machine winding according to claim 8, wherein the thermal stress relaxation layer is a non-adhesive layer.

10. The rotating electrical machine winding according to claim 9, wherein the non-adhesive layer is a coating layer formed by coating silicone resin to the insulating component.

11. The rotating electrical machine winding according to claim 9, wherein the non-adhesive layer is a coating layer formed by coating fluorocarbon resin to the insulating component.

12. The rotating electrical machine winding according to claim 8, wherein the thermal stress relaxation layer is an elastic body.

13. A rotating electrical machine according to claim 1, in which a rotating electrical machine winding is formed by providing a groundwall insulating layer and a corona shield layer around the outer periphery of a strands insulating layer or an inter-layer insulating layer disposed on a coil conductor, the rotating electrical machine winding is inserted into a slot formed in a rotating electrical machine core with a protective insulation intervening therebetween, a wedge is inserted on an opening side of the slot so as to fix the rotating electrical machine winding, insulation resin is grobal impregnated into the rotating electrical machine winding and rotating electrical machine core, and the impregnated insulation resin is cured;

wherein;

a semiconductive insulating layer is formed by wrapped taping a continuous semiconductive sheet, which is center-folded in a longitudinal direction thereof, between the strands insulating layer or the inter-layer insulating layer and the protective insulation; and

a thermal stress relaxation layer is formed inside the center-folded semiconductive sheet, the thermal stress relaxation layer relaxation thermal stress exerted in a thickness direction of the insulating layers.

14. A rotating electrical machine according to claim 1, in which a rotating electrical machine winding is formed by providing a groundwall insulating layer and a corona shield layer around the outer periphery of a strands insulating layer or an inter-layer insulating layer disposed on a coil conductor, the rotating electrical machine winding is inserted into a slot formed in a rotating electrical machine core with a protective insulation intervening therebetween, a wedge is inserted on an opening side of the slot so as to fix the rotating electrical machine winding, insulation resin is grobal impregnated into the rotating electrical machine winding and rotating electrical machine core, and the impregnated insulation resin is cured;

wherein;

a semiconductive insulating layer is formed by wrapped taping a continuous semiconductive sheet, which is center-folded in a longitudinal direction thereof, between the groundwall insulating layer and the inter-layer insulating layer or the strands insulating layer; and

a thermal stress relaxation layer is formed inside the center-folded semiconductive sheet, the thermal stress relaxation layer relaxation thermal stress exerted in a thickness direction of the insulating layers.

15. The rotating electrical machine winding according to claim 14, wherein:

the semiconductive insulating layer has a silicone resin layer inside the continuous semiconductive sheet, which is center-folded in the longitudinal direction; and

two layers of the semiconductive insulating layer are provided, the continuous semiconductive sheet in one of the two layers being lap-wound in a reverse direction.

16. A rotating electrical machine in which a rotating electrical machine winding is formed by providing a groundwall insulating layer and a corona shield layer around the outer periphery of a strands insulating layer or an inter-layer insulating layer disposed on a coil conductor, the rotating electrical machine winding is inserted into a slot formed in a rotating electrical machine core with a protective insulation intervening therebetween, a wedge is inserted on an opening side of the slot so as to fix the rotating electrical machine winding, insulation resin is grobal impregnated into the rotating electrical machine winding and rotating electrical machine core, and the impregnated insulation resin is cured;

wherein;

a semiconductive insulating layer is formed by wrapped taping a continuous semiconductive sheet, which is center-folded in a longitudinal direction thereof, between the groundwall insulating layer and the inter-layer insulating layer or the strands insulating layer;

a first thermal stress relaxation layer is formed inside the center-folded semiconductive sheet, the first thermal stress relaxation layer relaxation thermal stress exerted in a thickness direction of the insulating layers; and

a second thermal stress relaxation layer is formed in the protective insulation, the second thermal stress relaxation layer relaxation thermal stress exerted in a longitudinal direction of the rotating electrical machine winding.

17. The rotating electrical machine winding according to claim 16, wherein:

the protective insulation comprises two insulating sheets;

the second thermal stress relaxation layer is a non-adhesive layer; and

the non-adhesive layer is disposed between the two layers of the continuous insulating layers disposed at both ends in the longitudinal direction of the slot, except a central part.

18. The rotating electrical machine winding according to claim 16, wherein:

the protective insulation comprises two center-folded insulating sheets;

the fold line of each insulating sheet is positioned at the central part in the longitudinal direction of the slot; and

the second thermal stress relaxation layer is a non-adhesive layer, which is disposed inside the center-folded insulating sheet.

19. The rotating electrical machine winding according to claim 16, wherein:

the semiconductive insulating layer is disposed at a central part in a longitudinal direction of the slot; and

the protective insulation including two center-folded insulating sheets is disposed at both ends in the longitudinal direction of the slot, except the central part.

20. A semiconductive insulating component used to form a semiconductive insulating layer on a rotating electrical machine winding, the component comprising:

a continuous semiconductive sheet that is center-folded in a longitudinal direction thereof; and

a thermal stress relaxation layer disposed inside the center-folded continuous semiconductive sheet.

21. The semiconductive insulating component according to claim 20, wherein the continuous semiconductive sheet is formed by coating insulation resin in which carbon filler are mixed to an insulating component.

22. The semiconductive insulating component according to claim 21, wherein the thermal stress relaxation layer is a non-adhesive layer.

23. The semiconductive insulating component according to claim 22, wherein the non-adhesive layer is a coating layer formed by coating silicone resin to the insulating component.

24. The semiconductive insulating component according to claim 22, wherein the non-adhesive layer is a coating layer formed by coating fluorocarbon resin to the insulating component.

25. The semiconductive insulating component according to claim 21, wherein the thermal stress relaxation layer is an elastic body.