The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1998
Filed:
Mar. 12, 1997
Chi Mou Zhao, Taipei Hsien, TW;
Chin Po Liao, Yun Lin Hsien, TW;
Shyh-Jier Wang, Hsinchu, TW;
Huang Der-Ray, Hsinchu, TW;
Ying Tai-Fa, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
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.sub.S satisfies the following inequality relation: .pi./P.times.R.sub.M <R.sub.S <0.95R.sub.M ; (2) the neck width W.sub.S of the salient pole satisfies the following inequality relation: .pi./2P.times.R.sub.M <W.sub.S <2.pi./P.times.R.sub.M -g; (3) the depth D.sub.S of the slot opening satisfies the following inequality relation: .pi./P.times.R.sub.M <D.sub.S <2.5.pi./P.times.R.sub.M ; where R.sub.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.