Motor structure

摘要

This invention is to provide a motor structure in a salient pole type DC motor in which torque ripple and cogging torque are reduced without deceasing the efficiency and the torque constant, and hence the irregularity of the rotation is reduced. The magnetic flux density distribution of an air gap is more approached to a sine wave shape by forming a groove or a slit in the vicinity of the neutral part (a boundary of an N-pole and an S-pole) of a rotor magnet in the length of the air gap formed in a radial direction of the rotor magnet and a stator core of a salient pole type DC motor. <IMAGE>