Single-Phase Outer-Rotor Motor and Stator Thereof

Patent metadata

Field	Value
Publication number	US-2016329791-A1
Application number	US-201615148810-A
Country	US
Kind code	A1
Filing date	May 6, 2016
Priority date	May 8, 2015
Publication date	Nov 10, 2016
Grant date	—

Abstract

A single-phase outer-rotor motor and a stator thereof are provided. The stator includes a stator core having a yoke and a number of teeth. Each tooth includes a tooth body and a toot tip. A winding slot is formed between each two adjacent tooth bodies. A slot opening is formed between each two adjacent tooth tips. The tooth tip protrudes beyond the tooth body. Inner surfaces of at least part of the tooth tips facing the stator are formed with cutting grooves such that a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and deformed inwardly to narrow the slot opening.

First claim

1 . A stator for a single-phase outer-rotor motor, comprising a stator core, the stator core including:
a yoke; and a plurality of teeth extending outwardly from an outer edge of the yoke, each of the teeth including:
a tooth body connected with the yoke, a winding slot formed between each two adjacent tooth bodies; and
a tooth tip formed at a distal end of the tooth body, a slot opening formed between each two adjacent tooth tips, the tooth tip having a width in a circumferential direction greater than that of the tooth body and thus protruding beyond the tooth body in the circumferential direction, inner surfaces of at least part of the tooth tips facing the stator being formed with cutting grooves such that a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and deformed inwardly to narrow the slot opening.

2 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the portion of the tooth tip outside the cutting groove has a deformation angle of 15° to 60°.

3 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the portion of the tooth tip outside the cutting groove has a deformation angle of 20° to 45°.

4 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the cutting groove is formed in a connecting area between the tooth tip and the tooth body.

5 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the cutting groove is located adjacent the tooth body and spaced from the tooth body.

6 . The stator for a single-phase outer-rotor motor of claim 1 , wherein each of the tooth tips is formed with the cutting groove.

7 . The stator for a single-phase outer-rotor motor of claim 1 , wherein there is only one cutting groove is formed on the tooth tip, and a single side of the tooth tip is tilted outwardly before the tooth tip is forced to bend to form the stator core.

8 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the tooth tips of a half of the plurality of the teeth are formed with the cutting grooves, the tooth tips of the other half of the plurality of the teeth are not formed with the cutting grooves, and the tooth tips with the cutting grooves and the tooth tips without the cutting grooves are spacingly and alternatively arranged in the circumferential direction.

9 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the number of the cutting grooves on the tooth tip is two, the two cutting grooves are located at opposite sides of the tooth body, and both sides of the tooth tip are tilted outwardly before the tooth tip is forced to bend inwardly to form the stator core.

10 . The stator for a single-phase outer-rotor motor of claim 1 , wherein the stator further comprises windings wound around the stator core, the portion of the tooth tip outside the cutting groove is tilted outwardly before the windings are wound around the stator core; after the windings are wound around the stator core, the tilted portion of the tooth tip deforms to bend inwardly to form the stator core.

11 . A stator for a single-phase outer-rotor motor, comprising:
a stator core including:
a yoke; and
a plurality of teeth extending outwardly from an outer edge of the yoke, each of the teeth including a tooth body connected with the yoke and a tooth tip formed at a distal end of the tooth body, the tooth tip having a width greater than that of the tooth body, two circumferential sides of the tooth tip extending beyond the tooth body to respectively form two wing portions, a slot opening being formed between adjacent wing portions of each two adjacent tooth tips; and
windings wound around the tooth bodies; wherein at least one of two wing portions adjacent each slot opening is tilted outwardly before the windings are wound, and the tilted wing portion is deformed to bend inwardly to form the stator core after the windings are wound.

12 . The stator for a single-phase outer-rotor motor of claim 11 , wherein the wing portions of each of the tooth tips of a half of the plurality of the teeth are both tilted outwardly, neither of the wing portions of the tooth tips of the other half of the plurality of the teeth are tilted outwardly, and the tooth tips with the tilted wing portions and the tooth tips without the tilted wing portions are spacingly and alternatively arranged in the circumferential direction.

13 . The stator for a single-phase outer-rotor motor of claim 11 , wherein before the windings are wound, one of the wing portions of each tooth tip is tilted outwardly, the other of the wing portions of each tooth tip is not tilted outwardly, and all the tilted wing portions are located at the same side of the tooth bodies.

14 . The stator for a single-phase outer-rotor motor of claim 11 , wherein the tilted wing portion is formed with a cutting groove and, after the windings are wound, the tilted wing portion deforms to bend inwardly to reduce or eliminate the cutting groove.

15 . A single-phase outer-rotor motor comprising:
a stator including a stator core and windings wound on the stator core, the stator core comprising a yoke and a plurality of teeth extending outwardly from an outer edge of the yoke, each of the teeth including:
a tooth body connected with the yoke, a winding slot formed between each two adjacent tooth bodies; and
a tooth tip formed at a distal end of the tooth body, a slot opening formed between each two adjacent tooth tips, the tooth tip having a width in a circumferential direction greater than that of the tooth body and thus protruding beyond the tooth body in the circumferential direction to respectively form two wing portions, a slot opening being formed between two adjacent wing portions of each two adjacent tooth tip, an inner surface of at least one of two adjacent wing portions on opposite sides of each slot opening facing the stator being formed with a cutting groove such that prior to the windings are wound, a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and after the windings are wound, the tilted portion of the tooth tip is capable of being deformed to bend inwardly to narrow the slot opening; and
a rotor surrounding the stator, the rotor including a housing and at least one permanent magnet disposed inside the housing to form a plurality of magnetic poles, inner surfaces of the magnetic poles being opposed to and radially spaced from outer surfaces of the tooth tips to thereby form therebetween a gap, and the width of the slot opening in the circumferential direction being less than or equal to five times of a minimum width of the gap.

16 . The single-phase outer-rotor motor of claim 15 , wherein the width of the slot opening in the circumferential direction is less than or equal to three times of the minimum width of the gap.

17 . The single-phase outer-rotor motor of claim 15 , wherein a ratio of a maximum width to the minimum width of the gap is greater than two.

18 . The single-phase outer-rotor motor of claim 15 , wherein there are a plurality of the permanent magnets spacingly and evenly arranged in the circumferential direction, and each of the permanent magnets has a pole-arc coefficient greater than 0.7.

19 . The single-phase outer-rotor motor of claim 15 , wherein a radial width of the gap corresponding to each magnetic pole progressively increases from a middle portion toward circumferential ends of the magnetic pole.

20 . An

Assignees

• Johnson Electric Sa

Inventors

• Li Yue
• Zhou Chui You Andreas
• Wang Yong
• Li Gang
• Li Yong
• Zhang Wei
• Chai Jie

Classifications

• H02K15/095

  by laying conductors around salient poles · CPC title

• H02K29/03

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title

• H02K21/22 Primary

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

• H02K15/022

  with salient poles · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title