Patent ID: 7960886
Filing Date: 2011-06-14
Classification: H02K

Abstract:
1. A rotating electric machine comprising: a stator including a plurality of winding phases formed by distributed winding; a rotor including a plurality of magnetic poles and an outer circumference facing said stator; a first groove formed in said outer circumference of said rotor; a second groove formed in a position opposite to reference magnetic poles closest to said first groove, of said magnetic poles, with respect to said first groove; and a protrusion positioned between said first groove and said second groove and defined by said first and said second grooves, a ratio of a width half the width of said protrusion in a circumferential direction of said rotor to a width of said first groove and said second groove in the circumferential direction of said rotor being not smaller than 0.37 and not greater than 6, the width of said first groove in the circumferential direction of said rotor is not smaller than 2.3 degrees and not greater than 3.45 degrees in electrical angle, and a sum of an electrical angle of the width half the width of said protrusion in the circumferential direction of said rotor and an electrical angle of the width of said first groove in the circumferential direction of said rotor is constant.