Modular Permanent Magnet Vernier Machine Design and Optimization for Forging Servo Application

A comprehensive topology performance diagram of the permanent magnet vernier machine is constructed in this paper. The changes in the air gap harmonic magnetic field and the contribution of each harmonic to the average torque of the permanent magnet vernier machine (PWVM) with integer slot distribution winding and fractional slot concentrated winding are studied. Additionally, in the key electromagnetic performance indicators, such as copper loss, iron loss, efficiency, and power factor of different machines are analyzed and summarized. After comprehensive consideration, the optimal design scheme is identified, and the geometric parameters of the machine are optimized using a global optimization method. Subsequently, a prototype is manufactured employing a modular stator structure, and bench experiments are conducted. The experimental results demonstrate a close agreement with the finite element analysis results, providing crucial technical reference for the design of forging servo machines. It is noteworthy that the machine topology has been accepted by Estun Ltd for potential future industry applications.