Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
March 15, 2011
Patent Application Number
12379861
Date Filed
March 3, 2009
Patent Primary Examiner
Patent abstract
In a brushless motor including a rotor having 2n poles and a stator having 3n slots, segment magnets are arranged in three columns in the axial direction, thus constituting rotor poles. The segment magnets of adjacent columns, which are identical in polarity, are displaced in the circumferential direction, thus forming a three-stage step-skew structure. The skew angle θskew of each segment magnet is set to an electrical angle of 60° to 75°. The center angle of θm of each segment magnet is set to 46.8° to 52.7°.
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