Permanent-magnetic direct-drive wind generator, system and stator thereof

Patent metadata

Field	Value
Publication number	US-2018069442-A1
Application number	US-201515554133-A
Country	US
Kind code	A1
Filing date	Nov 17, 2015
Priority date	Apr 15, 2015
Publication date	Mar 8, 2018
Grant date	—

Abstract

A stator of a permanent magnet direct-drive wind power generator includes a stator support, a stator iron core, a blade side tooth pressing plate and a blade side surrounding plate. At least one comb tooth air inlet hole is provided on a side close to the rotor of the blade side surrounding plate, the comb tooth air inlet hole and the second air hole are connected respectively via an air guide pipe. A first spiral comb tooth mechanism is provided on a side, close to the rotor sealing ring, of the blade side surrounding plate, the first spiral comb tooth mechanism is in communication with the comb tooth air inlet hole. The first spiral comb tooth mechanism has first spiral comb teeth protruding into an annular gap formed by the blade side surrounding plate and the rotor sealing ring for generating an airflow with spiral motion.

First claim

1 . A stator of a permanent magnet direct-drive wind power generator, comprising:
a stator support, a stator iron core arranged around an outer peripheral wall of the stator support, a blade side tooth pressing plate, and a blade side surrounding plate; wherein the blade side tooth pressing plate is arranged on an axial end face at a blade side of the stator iron core, and a rotor matching with the stator has a rotor sealing ring; at least one first air hole is provided in the outer peripheral wall of the stator support, and at least one second air hole is provided in the blade side tooth pressing plate; the stator further comprises at least one air flow passage via which the first air hole and the second air hole are in communication with each other, and the at least one air flow passage extends through an interior of the stator iron core; at least one comb tooth air inlet hole is provided on a side, close to the rotor, of the blade side surrounding plate, the comb tooth air inlet hole and the second air hole are connected via an air guide pipe; and a first spiral comb tooth mechanism is provided on a side, close to the rotor sealing ring, of the blade side surrounding plate, the first spiral comb tooth mechanism as a whole is annular and is in communication with the at least one comb tooth air inlet hole, the first spiral comb tooth mechanism has first spiral comb teeth, the first spiral comb teeth protrude into an annular gap formed by the blade side surrounding plate and the rotor sealing ring for generating an airflow with spiral motion in the annular gap.

2 . The stator of the permanent magnet direct-drive wind power generator according to claim 1 , wherein in an axial direction of the stator, the comb tooth air inlet hole is located in the middle of the first spiral comb tooth mechanism, the first spiral comb tooth mechanism comprises first upper spiral comb teeth and first lower spiral comb teeth;
taking the comb tooth air inlet hole as a center, first spiral comb teeth at a side away from the stator support are the first upper spiral comb teeth and first spiral comb teeth at a side close to the stator support are the first lower spiral comb teeth; and in a sectional view of the first spiral comb teeth, the first upper spiral comb teeth are inclined in a direction away from the stator support to generate an air flow with an inclination angle of spiral motion being inclined towards a direction away from the stator support, and the first lower spiral comb teeth are inclined in a direction close to the stator support to generate an air flow with an inclination angle of spiral motion being inclined towards a direction close to the stator support.

3 . The stator of the permanent magnet direct-drive wind power generator according to claim 2 , wherein a spiral direction of the first upper spiral comb teeth is opposite to a spiral direction of the first lower spiral comb teeth.

4 . The stator of the permanent magnet direct-drive wind power generator according to claim 3 , wherein the spiral direction of the first upper spiral comb teeth is the same as a rotational direction of the rotor.

5 . The stator of the permanent magnet direct-drive wind power generator according to claim 2 , wherein the first spiral comb teeth further comprise a first middle comb tooth; and
the first middle comb tooth is provided in the comb tooth air inlet hole, the first middle comb tooth splits an air flow flowing from the comb tooth air inlet hole, to allow a part of the air flow to flow into the first upper spiral comb teeth, and the other part of the air flow to flow into the first lower spiral comb teeth.

6 . The stator of the permanent magnet direct-drive wind power generator according to claim 1 , wherein the stator further comprises a tower side tooth pressing plate and a tower side surrounding plate, the tower side tooth pressing plate is arranged on an axial end face at the tower side, of the stator iron core, and the rotor further comprises an end cover sealing ring; and
a second spiral comb tooth mechanism is provided on a side, close to the end cover sealing ring, of the tower side surrounding plate, the second spiral comb tooth mechanism as a whole is annular and has second spiral comb teeth, and the second spiral comb teeth protrude into an annular gap formed by the tower side surrounding plate and the end cover sealing ring, for generating an airflow with spiral motion in the annular gap.

7 . The stator of the permanent magnet direct-drive wind power generator according to claim 6 , wherein in a sectional view of the second spiral comb teeth, the second spiral comb teeth are inclined in a direction close to the stator support to generate an air flow with an inclination angle of spiral motion being inclined towards a direction close to the stator support.

8 . The stator of the permanent magnet direct-drive wind power generator according to claim 1 , wherein the at least one comb tooth air inlet hole and the at least one second air hole are connected respectively via an air guide pipe which as a whole is annular, or the at least one comb tooth air inlet hole and the at least one second air hole are connected respectively via a plurality of air guide pipes separated from each other.

9 . The stator of the permanent magnet direct-drive wind power generator according to claim 1 , wherein a stamped sheet fixing key is fixed on the outer peripheral wall of the stator support, a dovetail groove of the stator iron core is arranged on the stamped sheet fixing key, and the at least one air flow passage extends through the stamped sheet fixing key to be in communication with the at least one first air hole.

10 . The stator of the permanent magnet direct-drive wind power generator according to claim 9 , wherein the air flow passage comprises a radial air flow passage and an axial air flow passage, the radial air flow passage extends through the stamped sheet fixing key and the interior of the stator iron core, the radial air flow passage has one end connected to the first air hole and another end connected to the axial air flow passage, and the axial air flow passage extends axially through the interior of the stator iron core to be in communication with the second air hole.

11 . The stator of the permanent magnet direct-drive wind power generator according to claim 10 , wherein a plurality of the first air holes, a plurality of the second air holes and a plurality of the air flow passages are provided and have the same number; and
the plurality of first air holes, the plurality of second air holes, and the plurality of air flow passages are arranged circumferentially uniformly, and are communicated respectively, to generate a plurality of independent air flow paths from the outer peripheral wall of the stator support to the blade side tooth pressing plate.

12 . A permanent magnet direct-drive wind power generator, comprising a rotor and the stator according to claim 1 .

13 . A permanent magnet direct-drive wind power generator system, comprising the permanent magnet direct-drive wind power generator according to claim 12 and an air source system arranged inside a wind power generator unit, wherein the air source system is connected to the first air hole.

14 . The permanent magnet direct-drive wind power generator system according to claim 13 , wherein the air source system comprises an air source generation device configured to generate an air flow with a predetermined pressure, and an air source treatment device configured to purify and dry the air flow.

15 . The permanent magnet direct-drive wind power generator system

Assignees

• Xinjiang Goldwind Science & Tech Co Ltd

Inventors

• Ma Shengjun
• XIN Rujang
• Wang Dong
• Liu Chengqian

Classifications

• H02K1/18 Primary

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

• H02K7/1838

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

• F05B2240/57

  Seals · CPC title

• F05B2220/7068

  equipped with permanent magnets · CPC title

• H02K21/22

  with magnets rotating around the armatures, e.g. flywheel magnetos · CPC title