Analysis of the Generation and Weakening of Cogging Torque in Interior Permanent Magnet Machine

Abstract

The permanent magnet of interior permanent magnet motor is inside the rotor. Compared with the surface-mount permanent magnet motor, its equivalent air gap is small and the cogging torque has a great influence. In this paper, the cogging torque of interior permanent magnet synchronous motor is analyzed and deduced by the energy method. Taking the 48-slot/8-pole interior V-type permanent magnet synchronous motor as the research object, the influence of the axial segmented skew of the permanent magnets, the width of the stator slot and permanent magnets segmentation on the cogging torque was analyzed by the finite element method. Studies have shown that the reasonable selection of the above three methods can effectively weaken the cogging torque of V-type interior permanent magnet motor.