A Study on Reducing Cogging Torque of IPMSM Applying Rotating Tapering

Abstract

The Interior Permanent Magnet Synchronous Motor(IPMSM) has a structure in which a permanent magnet is inserted inside the rotor, and cogging torque is generated in its structure. To solve this problem, various methods for reducing the cogging torque are being studied. The first method is to reduce the cogging torque by increasing the air gap length by applying tapering to the rotor or stator core. However, in case of reducing the cogging torque above a certain level, the tapering application method may cause a decrease in output because the position and shape of the permanent magnet are restricted. The second method is to apply skew to the stator or rotor. This is the most reliable way to reduce the cogging torque, but the magnetization rate of the permanent magnet is low, so the manufacturability is low. In this paper, we describe a rotor with rotational tapering that fuses the advantages of tapering and skew and offsets the disadvantages. The motor design used 3D finite element analysis(FEA), and the validity of this paper was verified by making the final model and comparing it with the simulation results. IEEE