Brushless motor stator design

摘要

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 RS satisfies the following inequality relation: pi /PxRM<RS<0.95RM; (2) the neck width WS of the salient pole satisfies the following inequality relation: pi /2PxRM<WS<2 pi /PxRM-g; (3) the depth DS of the slot opening satisfies the following inequality relation: pi /PxRM<DS<2.5 pi /PxRM; where RM 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.