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US 11,384,741 B2Granted
Stator assembly, electric machine and wind turbine having the stator assembly
AssigneeBeijing Goldwind Science & Creation Windpower Equipment Co., Ltd.
InventorShengjun Ma
Life of this patent
Estimating the term…
Abstract
A stator assembly, an electric machine and a wind turbine having the stator assembly are provided. The stator assembly includes a stator iron core, a stator bracket supporting the stator iron core, and an air flow conveyer configured to convey a first cold air flow along the radial direction of the stator iron core to a radial side surface of the stator iron core opposite to an air gap side. The embodiment of the present disclosure enables two radial sides of the stator to be cooled at the same time. Thereby, the expansion and deformation of the stator iron core are reduced, the air gap is prevented from being narrowed, magnetic poles are protected from being baked by the high temperature of the stator, and the service life of the electric machine is prolonged.
Claims20
A stator assembly, comprising:
- a stator core, comprising:
- a first radial side surface adjacent to an air gap between the stator core and a rotor;
- and
- a second radial side surface opposite to the first radial side surface;
- a stator bracket supporting the stator core;
- and
- an airflow conveying device configured to convey first cold airflow, in a radial direction of the stator core, to the second radial side surface of the stator core,
- wherein the airflow conveying device comprises a plurality of ejection tubes,
- wherein the stator bracket comprises an enclosure plate, an annular gap is formed between the second radial side surface of the stator core and the enclosure plate, the enclosure plate is provided with a plurality of first through holes, and the plurality of ejection tubes are inserted in the plurality of first through holes, respectively, and configured to eject the first cold airflow into the annular gap towards the second radial side surface, and
- wherein at least a cavity extending axially is formed at a radial inner side of the enclosure plate, and the enclosure plate is provided with a second through hole configured to make the annular gap and the cavity be in communication with each other, to allow the first cold airflow ejected into the annular gap to enter into the cavity through the second through hole.
7 more elements
An electric machine, comprising:
- a rotor;
- and
- a stator assembly, comprising:
- a stator core, comprising:
- a first radial side surface adjacent to an air gap between the stator core and the rotor;
- and
- a second radial side surface opposite to the first radial side surface;
- a stator bracket supporting the stator core;
- and
- an airflow conveying device configured to convey first cold airflow, in a radial direction of the stator core, to the second radial side surface of the stator core,
- wherein the airflow conveying device comprises a plurality of ejection tubes,
- wherein the stator bracket comprises an enclosure plate, an annular gap is formed between the second radial side surface of the stator core and the enclosure plate, the enclosure plate is provided with a plurality of first through holes, and the plurality of ejection tubes are inserted in the plurality of first through holes, respectively, and configured to eject the first cold airflow into the annular gap towards the second radial side surface, and
- wherein at least a cavity extending axially is formed at a radial inner side of the enclosure plate, and the enclosure plate is provided with a second through hole configured to make the annular gap and the cavity be in communication with each other, to allow the first cold airflow ejected into the annular gap to enter into the cavity through the second through hole.
10 more elements
A wind turbine, comprising:
- a stator assembly, comprising:
- a stator core, comprising:
- a first radial side surface adjacent to an air gap between the stator core;
- and
- a rotor and a second radial side surface opposite to the first radial side surface;
- a stator bracket supporting the stator core;
- and
- an airflow conveying device configured to convey first cold airflow, in a radial direction of the stator core, to the second radial side surface of the stator core;
- and
- a cold airflow supply unit, coupled to the airflow conveying device for supplying the first cold airflow to the airflow conveying device,
- wherein the airflow conveying device comprises a plurality of ejection tubes,
- wherein the stator bracket comprises an enclosure plate, an annular gap is formed between the second radial side surface of the stator core and the enclosure plate, the enclosure plate is provided with a plurality of first through holes, and the plurality of ejection tubes are inserted in the plurality of first through holes, respectively, and configured to eject the first cold airflow into the annular gap towards the second radial side surface, and
- wherein at least a cavity extending axially is formed at a radial inner side of the enclosure plate, and the enclosure plate is provided with a second through hole configured to make the annular gap and the cavity be in communication with each other, to allow the first cold airflow ejected into the annular gap to enter into the cavity through the second through hole.
10 more elements
A stator assembly, comprising:
- a stator core, comprising:
- a first radial side surface adjacent to an air gap between the stator core and a rotor;
- and
- a second radial side surface opposite to the first radial side surface;
- a stator bracket supporting the stator core;
- and
- an airflow conveying device configured to convey first cold airflow, in a radial direction of the stator core, to the second radial side surface of the stator core,
- wherein the airflow conveying device comprises a plurality of ejection tubes, the plurality of ejection tubes are arranged on the stator bracket, and a nozzle of each of the ejection tubes faces the second radial side surface of the stator core,
- wherein the stator bracket comprises a plurality of stand columns extending axially, an inner cylinder plate extending axially, and a plurality of rib plates connecting the plurality of stand columns and the inner cylinder plate, and
- wherein the plurality of stand columns are uniformly arranged in a circumferential direction, and the stator core is mounted to the stator bracket by being fastened to the plurality of stand columns, a cavity is formed between the second radial side surface of the stator core and the inner cylinder plate, and a nozzle of a corresponding ejection tube from the plurality of ejection tubes is located in the cavity and faces the second radial side surface of the stator core.
7 more elements
Dependencies are inferred from the claim text.