Optimization and Performance Analysis of Asymmetric Interior Permanent Magnet Motor

In this paper, a novel type of asymmetric interior permanent magnet synchronous motor (AIPM) is presented. The motor's topology is based on an interior U-shaped structure, with an asymmetric slot-type stator and dissymmetrical permanent magnets (PMs) in the rotor. The influences of both stator and rotor variables are investigated using finite element analysis. The Taguchi Algorithm is applied for optimization under constant copper loss, resulting in a significant enhancement of torque quality. A further comparison between the proposed AIPM and IPM is conducted, including output torque, air gap flux density, and dual-direction rotation performance. It is demonstrated that the proposed AIPM effectively reduces cogging torque and torque ripple, while also enhancing average output torque to a certain extent.