STATOR USED FOR MOTOR, MOTOR AND VENTILATION COOLING METHOD FOR MOTOR

• US 20170179781A1
• Filed: 05/08/2015
• Published: 06/22/2017
• 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
• Granted Patent: US 10,644,557 B2
• Time in Patent Office: Days
• 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, 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.

2. The stator according to claim 1, wherein tooth portions of an 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 an axial 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 at least one of the tooth portions and a yoke portion of slot base of the 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 portions forms a second ventilation path at the tooth portion, and the axial ventilation hole in the yoke portion of slot base forms a third ventilation path at the yoke portion of slot base.

7. The stator according to claim 1, 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.

8. 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 high pressure area and a low pressure area.

9. 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 a rotor, and a fourth ventilation path is formed by the air gap.

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

11. The electric machine according to claim 10, wherein the electric machine comprises a wind driven generator.

12. A ventilation and cooling method for an electric machine, implemented by the electric machine according to claim 10, wherein the ventilation and cooling method comprises:

separating the electric machine into the high pressure area and the low pressure area by the support configured to fix the stator; and

entering cold air into the high pressure area via pipelines to cool the electric machine via the first ventilation path formed by the gap between the at least two wedges, and then entering the cold air into the low pressure area to avow the cold air to change into hot air.

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 the second ventilation path formed in the tooth portion of the stator and the third ventilation path formed in the yoke portion of slot base of the stator, and then entering the cold air into the low pressure area to avow the cold air to change into hot air.

14. The ventilation and cooling method for the electric machine according to claim 12, wherein the cold air cools the electric machine via the fourth ventilation path formed by the air gap between the rotor and the iron core of the stator, and then enters into the low pressure area to be turned into hot 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 hot air into a cooling system in an electric machine room of the electric machine via pipelines to cool the hot 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 via pipelines 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 comprises:

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

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