Stator assembly, electrical motor, wind power generator set and method for cooling stator assembly

Patent metadata

Field	Value
Publication number	US-2021021163-A1
Application number	US-201917043225-A
Country	US
Kind code	A1
Filing date	Sep 3, 2019
Priority date	Sep 14, 2018
Publication date	Jan 21, 2021
Grant date	—

Abstract

A stator assembly, an electrical motor having the stator assembly, a wind power generator set and a method for cooling a stator assembly are provided. The stator assembly includes a stator support and a stator core mounted on the stator support, wherein the stator support includes a support enclosure plate, a first axial air flow channel is formed between the support enclosure plate of the stator support and a radial side surface of the stator core, and the first axial air flow channel is used for receiving a first cold air flow, so that the cold air flow can flow in the axial direction. The stator assembly can introduce a cold air flow from the other side, opposite an air gap, of a stator during the operation of an electrical motor, so that two radial sides of the stator can be cooled at the same time.

First claim

1 . A stator assembly, comprising:
a stator bracket, and a stator core, wherein the stator bracket comprises a support enclosure plate ( 220 ), the stator core is mounted on the support enclosure plate, a first axial airflow channel is formed between the support enclosure plate and a radial side surface of the stator core, wherein the stator assembly further comprises an airflow delivering unit for supplying a first cold airflow to the first axial airflow channel, which makes the first cold airflow flow in an axial direction of the first axial airflow channel.

2 . The stator assembly according to claim 1 , wherein the stator assembly further comprises a bridging portion provided in the first axial airflow channel, and the bridging portion extends in a radial direction of the stator assembly, and has one end connected to the stator core and the other end connected to the support enclosure plate.

3 . The stator assembly according to claim 2 , wherein a plurality of bridging portions are provided, each of which is in a shape of a column, and the plurality of bridging portions are arranged in a row or a cross in a flow direction of the first cold airflow,
wherein a cross-section of the bridging portion is in a shape of a droplet, and comprises a windward surface toward a first axial end of the stator core and a leeward surface toward a second axial end of the stator core in the flow direction of the first cold airflow, both the windward surface and the leeward surface are circular arc surfaces, the windward surface and the leeward surface are connected by a straight surface that is tangent to the windward surface and the leeward surface, and a radius of the arc surface of the windward surface is greater than a radius of the arc surface of the leeward surface.

4 . The stator assembly according to claim 2 , the stator core is formed by stacking a plurality of silicon steel sheets, and a plurality of protrusions extending integrally and radially inward are provided on a radially inner circumference of each of the plurality of silicon steel sheets, the protrusions on adjacent silicon steel sheets are stacked on each other to form the bridging portion after the plurality of the silicon steel sheets are stacked.

5 . The stator assembly according to claim 1 , wherein the radial side surface of the stator core is uneven in an axial direction of the stator core, which makes the first axial airflow channel be formed as a variable cross-section channel.

6 . The stator assembly according to claim 5 , wherein the radial side surface of the stator core is bent a plurality of times in the axial direction, which makes the first axial airflow channel be formed as the variable-section channel, in which gradually expanding channels and gradually contracting channels are alternately arranged in the axial direction.

7 . The stator assembly according to claim 5 , wherein the stator assembly further comprises a spoiler inserted in the first axial airflow channel, and the spoiler has at least one of the following structure features:
the spoiler has a rough surface; the spoiler is provided with meshes penetrating a radial thickness of the spoiler; the spoiler is a metal plate or a ceramic plate; a surface of the spoiler is formed as a chrome black surface or a sintered surface; and the spoiler is uneven in the axial direction of the stator core, and a variable cross-section channel is formed between the stator core and the spoiler.

8 . The stator assembly according to claim 6 , wherein the spoiler is bent a plurality of times in the axial direction of the stator core, and, a variable-section channel, in which gradually expanding channels and gradually contracting channels are alternately arranged in the axial direction, is formed between the stator core and the spoiler, the meshes are provided at positions corresponding to the gradually contracting channels.

9 . The stator assembly according to claim 5 , wherein a plurality of protrusion portions are formed on the radial side surface of the stator core and a cross-section of each of the protrusion portions in the axial direction is in a shape of at least one of a semi-droplet, a stalactite, an arc or a square.

10 . The stator assembly according to claim 9 , wherein the stator core is formed by stacking a plurality of silicon steel sheets, and a plurality of protrusions extending integrally and radially inward are provided on a radially inner circumference of each of the silicon steel sheets, after the plurality of silicon steel sheets are stacked, the protrusions are stacked on each other to form the protrusion portions.

11 . The stator assembly according to claim 1 , wherein the stator assembly further comprises a spoiler inserted in the first axial air flow channel, the spoiler has at least one of the following structural features:
the spoiler has a rough surface; the spoiler is provided with meshes penetrating a radial thickness of the spoiler; the spoiler is a metal plate or a ceramic plate; a surface of the spoiler is formed as a chrome black surface or a sintered surface; and the spoiler is uneven in the axial direction of the stator core, and a variable cross-section channel is formed between the stator core and the spoiler.

12 . The stator assembly according to claim 11 , wherein the spoiler is bent a plurality of times in the axial direction of the stator core, and a variable-section channel, in which gradually expanding channels and gradually contracting channels are alternately arranged in the axial direction, is formed between the stator core and the spoiler.

13 . The stator assembly according to claim 1 , wherein the stator bracket is provided in a radially inner side of the stator core, and the stator bracket is further provided with a second axial airflow channel formed in a radially inner side of the support enclosure plate, and the stator core further comprises the airflow delivering unit, which is configured to supply the first cold airflow to the first axial airflow channel and supply a second cold airflow to the second axial airflow channel, and the airflow delivering unit is configured to make the first cold airflow and the second cold airflow be in the same direction or in reverse directions.

14 . The stator assembly according to claim 13 , wherein the airflow delivering unit comprises a cold airflow confluence box provided at one axial end of the stator core and a hot airflow confluence box provided at the other axial end of the stator core, the first cold airflow is supplied to the first axial airflow channel and the second axial airflow channel through the cold airflow confluence box, and the hot air flow confluence box is configured to collect the first cold airflow through the first axial airflow channel and/or the second cold airflow through the second axial airflow channel.

15 . The stator assembly according to claim 1 , wherein the stator core further comprises the airflow delivering unit, and the airflow delivering unit further comprises a vortex tube mounted on the stator support, the vortex tube comprises a vortex chamber, a nozzle in communication with the vortex chamber tangentially in a radial direction of the vortex chamber, a hot end tube section connected to one axial side of the vortex chamber, a cold end tube section connected to the other axial side of the vortex chamber, and a regulating valve provided in the hot end tube section, and the cold end tube section is in communication with the first axial airflow channel.

16 . An electrical motor, comprising the stator assembly according to claim 1 .

Assignees

• Beijing Goldwind Science & Creation Windpower Equipment Co Ltd

Inventors

• Ma Shengjun

Classifications

• H02K1/18 Primary

  Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures · CPC title

• H02K9/227

  Heat sinks · CPC title

• H02K9/12

  wherein the cooling medium circulates freely within the casing · CPC title

• H02K7/1838

  Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine · CPC title

• H02K1/20 Primary

  with channels or ducts for flow of cooling medium · CPC title