Stator used for motor, motor and ventilation cooling method for motor

• US 10,644,557 B2
• Filed: 05/08/2015
• Issued: 05/05/2020
• Est. Priority Date: 06/13/2014
• Status: Active Grant

• Current Assignee: Goldwind Science & Technology Co., Ltd.
• Original Assignee: Xinjiang Goldwind Science & Technology Company Limited
• Inventors: Fan, Wenshou, Zhao, Xiang
• Primary Examiner(s): Kim, John K
• Application Number:
  US15/317,348
• Publication Number:
  US 20170179781A1
• Time in Patent Office: 1,824 Days
• Field of Search: 310 52, 310 58, 310 59
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/48 in slots
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 9/04 having means for generating a flow of cooling medium

Abstract

A stator used for a motor, the motor and a ventilation cooling method for the motor. The stator includes concentrated windings, and at least two wedge blocks are arranged at the gaps between the adjacent concentrated windings. The at least two wedge blocks are distributed on the concentrated windings in a staggered manner to form a first ventilation path. Therefore, the concentrated windings can be cooled effectively, the concentrated windings are effectively constrained in the circumferential direction by means of the at least two wedge blocks, the service life of the motor is further prolonged, and the reliability of the motor is improved.

Claims

1. A stator for an electric machine, comprising concentrated windings, each of the concentrated windings winds around a tooth portion of an iron core of the stator, and at least two wedges are provided in a gap formed between adjacent ones of the concentrated windings, wherein the at least two wedges are staggered on the concentrated winding in both an axial direction and a radial direction of the stator to form an axial first ventilation path,

wherein each of the at least two wedges is wrapped with an insulation felt, and the insulation felt is processed by vacuum pressure impregnating, to allow the at least two wedges and the concentrated windings to form integrally.

2. The stator according to claim 1, wherein tooth portions of the iron core of the stator are parallel, and each of slots corresponding to the iron core of the stator is a trapezoidal-shaped slot.

3. The stator according to claim 2, wherein the at least two wedges comprises a first wedge group and a second wedge group, and the first wedge group and the second wedge group are staggered in both the axial direction and the radial direction of the stator.

4. The stator according to claim 3, wherein each of the wedges in the first wedge group and the second wedge group is trapezoidal-shaped, and the trapezoidal-shaped wedges are in plane contact with the concentrated windings.

5. The stator according to claim 4, wherein a height of the trapezoidal-shaped wedge is slightly larger or smaller than half of a depth of the trapezoidal-shaped slot.

6. The stator according to claim 1, wherein the stator further comprises a support for supporting the stator, and the support separates an inner cavity of the electric machine into a first pressure area and a second pressure area, wherein pressure of the first pressure area is higher than that of the second pressure area.

7. The stator according to claim 1, wherein a slot wedge is

further provided to bridge the gap, an air gap is formed between the slot wedge and the rotor, and a fourth ventilation path is formed by the air gap.

8. An electric machine, wherein the electric machine comprises the stator according to claim 1.

9. The electric machine according to claim 8, wherein the electric machine comprises a wind driven generator.

10. A stator, for an electric machine, comprising concentrated windings, and, at least two wedges are provided in a gap formed between adjacent ones of the concentrated windings, wherein the at least two wedges are staggered on the concentrated winding to form a first ventilation path, wherein at least one of a tooth portion and a yoke portion of a slot base of an iron core of the stator are each provided with an axial ventilation hole, the axial ventilation hole in the at least one of the tooth portion forms a second ventilation path at the tooth portion, and the axial ventilation hole in the yoke portion of the slot base forms a third ventilation path at the yoke portion of the slot base.

11. An electric machine, wherein the electric machine comprises the stator according to claim 10.

12. A ventilation and cooling method for an electric machine, implemented by the electric machine, in which the electric machine comprises the stator, and the stator comprises concentrated windings, and at least two wedges are provided in a gap, formed between adjacent ones of the concentrated windings, wherein the at least two wedges are staggered on the concentrated winding to form a first ventilation path, wherein the ventilation and cooling method comprises:

separating the electric machine into a first pressure area and a second pressure area by a support configured to fix the stator, wherein pressure of the first pressure area is higher than that of the second pressure area; and

entering air into the first pressure area to cool the electric machine via the axial first ventilation path formed by the gap between the at least two wedges, and then entering the air into the second pressure area to allow a temperature of the air to be increased.

13. The ventilation and cooling method for the electric machine according to claim 12, wherein the ventilation and cooling method further comprises:

cooling the electric machine via a second ventilation path formed in the tooth portion of the stator and a third ventilation path formed in a yoke portion of a slot base of the stator, and then entering air into the second pressure area to allow the temperature of the air to be increased.

14. The ventilation and cooling method for the electric machine according to claim 12, wherein the air cools the electric machine via a fourth ventilation path formed by an air gap between the rotor and the iron core of the stator, and then enters into the second pressure area to increase the temperature of the air.

15. The ventilation and cooling method for the electric machine according to claim 12, wherein the ventilation and cooling method further comprises:

entering the air with an increased temperature into a cooling system in an electric machine room of the electric machine to cool the air, and returning cooled air to an interior of the electric machine, thus forming an inner circulation air path.

16. The ventilation and cooling method for the electric machine according to claim 15, wherein the ventilation and cooling method further comprises:

entering cold air outside the electric machine room of the electric machine into the cooling system in the electric machine room,

cooling the hot air in the inner circulation air path via the cooling system in the electric machine room, and

discharging the hot air out of the electric machine room.

17. The ventilation and cooling method for the electric machine according to claim 13, wherein the ventilation and cooling method further comprises:

entering the hot air into a cooling system in an electric machine room of the electric machine to cool the hot air, and

returning cooled air to an interior of the electric machine, thus forming an inner circulation air path.

18. The ventilation and cooling method for the electric machine according to claim 14, wherein the ventilation and cooling method further entering the hot air into a cooling system in an electric machine room of the electric machine to cool the hot air, and

returning cooled air to an interior of the electric machine, thus forming an inner circulation air path.