Industrial Technology Research Institute

Ying Tai-Fa

Shyh-Jier Wang

Chi Mou Zhao

Huang Der-Ray

Chin Po Liao

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 &lt;R.sub.S &lt;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 &lt;W.sub.S &lt;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 &lt;D.sub.S &lt;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.

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Hsinchu, Taiwan

Ying Tai-Fa