Reach on Operation Principle and Electromagnetic Characteristics of the Partitioned-Stator Permanent-Magnet Vernier Motor

A new Partitioned-Stator Permanent-Magnet Vernier (PS-PMV) motor is proposed in this paper, in which the power density and torque density are further improved to meet the operational requirements of direct drive systems for low-speed and high-torque conditions. Besides, partitioned-stator and intermediate rotor structure are adopted, and the PM magnetic field can be modulated to effective harmonic magnetic field with few pole-pair number and high speed, then the field winging is designed according to the effective harmonic magnetic field, so the magnetic field excited by two sets of PMs is coupled of armature windings. Firstly, the topology of PS-PMV motor is introduced. Secondly, the operational principle of the motor is elaborated in detail, and an analysis of the air-gap flux density is conducted based on the equivalent magnetic circuit method. Finally, the performances of PS-PMV motor are calculated and simulated using the finite element analysis, thus confirming its suitability for direct drive systems with high power density and high torque density.