Effects of V-skew on the cogging torque in permanent magnet synchronous motor

In this paper, we proposed how the V-skew applied on a magnet of the rotor to improve the characteristics of cogging torque in large PMSM. Large PMSM is difficult to apply a pitch of the diagonal magnetic skew because of the motor's structure and making. In addition, the force in the direction of z-axis occurs when the diagonal skew is applied. So we are applying the optimal v-skew to reduce torque ripple and cogging torque because this reduces the noise and vibration on the motor. Through FEM 3D analysis, we studied to find the optimal v-skew angle for reducing torque ripple.