US5744893A
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Brushless motor stator design
Assignee: Transpacific IP Ltd
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Filing: 1997-03-12
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Granted: 1998-04-28
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Expires: 2017-03-12
Abstract
Abstract A brushless motor stator for an axially wound brushless motor with a diametrical air-gap having a plate structure with at least one plate, the profile of the plate comprising: a central circular hole; a number of salient poles surrounding the central circular hole; and a slot opening between every two adjacent said salient poles. The salient poles and those slot openings have the following characteristics: (1) the outer rim of the salient pole is in the form of a circular arc segment whose arc radius R S satisfies the following inequality relation: π/P×R M <R S <0.95R M ; (2) the neck width W S of the salient pole satisfies the following inequality relation: π/2P×R M <W S <2π/P×R M -g; (3) the depth D S of the slot opening satisfies the following inequality relation: π/P×R M <D S <2.5π/P×R M ; where R M reprents the radius from the center to the outer rim of the brushless motor stator; P reprents the number of poles of permanent magnets used in the brushless motor; and g reprents air-gap width between the salient poles and the permanent magnets. The three aforementioned characteristics can be used either individually or in various combinational groups for designing the profile of a stator.
Inventors
- 👤 Chi Mou Zhao
- 👤 Chin Po Liao
- 👤 Shyh-Jier Wang
- 👤 Huang Der-Ray
- 👤 Ying Tai-Fa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:02
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K21/227; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/145; H02K29/00; H02K29/03; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
A brushless motor stator for an axially wound, single-phase brushless motor with a diametrical air-gap having a plate structure with at least one plate, the profile of said plate comprising: a central circular hole; a plurality of salient poles surrounding said central circular hole, wherein an outer rim of each said salient pole is in the form of an arc; and a slot opening between every two adjacent said salient poles, wherein the radius of said arc satisfies the following inequality relation: π/P×R.sub.M <R.sub.S <0.95R.sub.M ; where R M represents the radius from the center to the outer rim of the brushless motor stator; R S represents the radius of said arc; and P represents the number of poles of permanent magnets used in said motor.
Claim 2
Dependent Claim
126 words
A brushless motor stator for an axially wound, single-phase brushless motor with a diametrical air-gap having a plate structure with at least one plate, the profile of said plate comprising: a central circular hole; a plurality of salient poles surrounding said central circular hole, wherein an outer rim of each said salient pole is in the form of an arc; and a slot opening between every two adjacent said salient poles, wherein the radius of said arc satisfies the following inequality relation: π/P×R.sub.M <R.sub.S <0.95R.sub.M ; where R M represents the radius from the center to the outer rim of the brushless motor stator; R S represents the radius of said arc; and P represents the number of poles of permanent magnets used in said motor.
Claim 3
Dependent Claim
80 words
A brushless motor stator according to claim 1, wherein a neck width of said salient poles satisfies the following inequality relation: π/2P×R.sub.M <W.sub.S <2π/P×R.sub.M -g; where R M represents the radius from the center to the outer rim of said brushless motor stator; W S represents said neck width of said salient pole; P represents the number of poles of permanent magnets used in said motor; and g represents the air-gap width between said salient poles and said permanent magnets.
Claim 4
Dependent Claim
64 words
A brushless motor stator according to claim 1, wherein the depth of said slot openings satisfies the following inequality relation: π/P×R.sub.M <D.sub.S <2.5π/P×R.sub.M ; where R M represents the radius from the center to the outer rim of said brushless motor stator; D S represents the depth of said slot opening; P represents the number of poles of permanent magnets used in said motor.
Claim 5
Dependent Claim
143 words
A brushless motor stator for an axially wound brushless, single-phase motor with a diametrical air-gap having a plate structure with at least one plate, the profile of said plate comprising: a central circular hole; a plurality of salient poles surrounding said central circular hole, wherein the outer rim of each said salient pole is in the form of an arc; and a slot opening between every two adjacent said salient poles, wherein the neck width of said salient poles satisfies the following inequality relation: π/2P×R.sub.M <W.sub.S <2π/P×R.sub.M -g; where R M represents the radius from the center to the outer rim of said brushless motor stator; W S represents the neck width of said salient pole; P represents the number of poles of permanent magnets used in said motor; and g represents the air-gap width between said salient poles and said permanent magnets.
Claim 6
Dependent Claim
143 words
A brushless motor stator for an axially wound brushless, single-phase motor with a diametrical air-gap having a plate structure with at least one plate, the profile of said plate comprising: a central circular hole; a plurality of salient poles surrounding said central circular hole, wherein the outer rim of each said salient pole is in the form of an arc; and a slot opening between every two adjacent said salient poles, wherein the neck width of said salient poles satisfies the following inequality relation: π/2P×R.sub.M <W.sub.S <2π/P×R.sub.M -g; where R M represents the radius from the center to the outer rim of said brushless motor stator; W S represents the neck width of said salient pole; P represents the number of poles of permanent magnets used in said motor; and g represents the air-gap width between said salient poles and said permanent magnets.
Claim 7
Dependent Claim
65 words
A brushless motor stator according to claim 4, wherein the depth of said slot openings satisfies the following inequality relation: π/P×R.sub.M <D.sub.S <2.5π/P×R.sub.M ; where R M represents the radius from the center to the outer rim of said brushless motor stator; D S represents the depth of said slot opening; and P represents the number of poles of permanent magnets used in said motor.
Claim 8
Dependent Claim
128 words
A brushless motor stator for an axially wound brushless, single-phase motor with a diametrical air-gap having a plate structure with at least one plate, the profile of said plate comprising: a central circular hole; a plurality of salient poles surrounding said central circular hole, wherein an outer rim of each said salient pole is in the form of an arc; and a slot opening between every two adjacent said salient poles, wherein the depth of said slot openings satisfies the following inequality relation: π/P×R.sub.M <D.sub.S <2.5π/P×R.sub.M ; where R M represents the radius from the center to the outer rim of said brushless motor stator; D S represents the depth of said slot opening; and P represents the number of poles of permanent magnets used in said motor.
Claim 9
Dependent Claim
128 words
A brushless motor stator for an axially wound brushless, single-phase motor with a diametrical air-gap having a plate structure with at least one plate, the profile of said plate comprising: a central circular hole; a plurality of salient poles surrounding said central circular hole, wherein an outer rim of each said salient pole is in the form of an arc; and a slot opening between every two adjacent said salient poles, wherein the depth of said slot openings satisfies the following inequality relation: π/P×R.sub.M <D.sub.S <2.5π/P×R.sub.M ; where R M represents the radius from the center to the outer rim of said brushless motor stator; D S represents the depth of said slot opening; and P represents the number of poles of permanent magnets used in said motor.
Claim 10
Dependent Claim
105 words
A brushless motor stator according to claim 6, wherein the radius of said arc satisfies the following inequality relation: π/P×R.sub.M <R.sub.S <0.95R.sub.M ; and further that a neck width of said salient poles satisfies the following inequality relation; π/2P×R.sub.M <W.sub.S <2π/P×R.sub.M -g; where R M represents the radius from the center to the outer rim of said brushless motor stator; W S represents the neck width of said salient pole; P represents the number of poles of permanent magnets used in said motor; g represents the air-gap width between said salient poles and said permanent magnets; and R S represents the radius of said arc.
Claim 11
Dependent Claim
18 words
A brushless motor stator according to claim 1, wherein the meterial of said plate includes silicon steel sheet.
Claim 12
Dependent Claim
18 words
A brushless motor stator according to claim 4, wherein the meterial of said plate includes silicon steel sheet.
Claim 13
Dependent Claim
18 words
A brushless motor stator according to claim 6, wherein the meterial of said plate includes silicon steel sheet.
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