Design and Analysis of a New Consequent-pole Permanent-magnet Servo Motor based on Field Modulation

Abstract

This paper proposed a new consequent-pole permanent-magnet servo motor (CPMSM) based on field modulation, which has a surface-inset PM (SIPM) rotor with an arch on PMs. To increase the torque density under low speed, split teeth on main stator teeth are adopted. The fault-tolerant teeth and single-layer concentrated windings are employed to achieve phase decoupling and improve reliability. By using finite element analysis (FEA), the electromagnetic characteristics of the proposed motor are analyzed. The influence of main parameters, such as pole-arc coefficient, PM thickness and the height of the arch on PMs on back EMF, average torque and torque ripple are investigated. Furthermore, optimal design is developed to improve the performance of the proposed motor. Simulation results verified that the proposed motor is suitable for applications requiring low speed and high torque, such as robotic joints.