| 摘要 |
PURPOSE:To reconcile the reduction of cogging torque with the reduction of torque ripple, by organizing field spaces with concave sections on the central sections of salient magnetic poles. CONSTITUTION:Salient poles 51-53 for windings on the side of an armature 4 are provided with auxiliary grooves 8c1-8c3, 8d1-8d3, and the grooves are arranged near the both ends of the respective salient poles 51-53. Inside two auxiliary grooves 8c1-8c3, 8d1-8d3 of each salient poles 51-53, near the central sections of the respective salient poles 51-53, concave sections 81-83 with the variation due to the outer peripheral position of magnetic permeance be tween the salient poles and permanent magnets 2 facing each other via a space 9 in the diameter direction of the outer periphery which is more relaxed than the variation of the magnetic permeance on the auxiliary grooves 8c1-8c3, 8d1-8d3 are formed. |
