Design and Research of a Dual Rotor Consequent-Pole Vernier Motor With Halbach Array

Abstract

Aiming at improving the torque density of the motor and the utilization rate of permanent magnets (PMs), a dual rotor consequent-pole vernier motor (DRCPVM) is proposed in this article. The stator of the motor has a double-sided structure with two sets of independent windings on each side. Therefore, the proposed motor has different working modes according to the on/off state of the two sets of windings. In the design process, DRCPVM is used as a basic model and optimization is performed on it. The optimization includes the slot width and height of the stator teeth and the radian ratio occupied by the PMs. Moreover, the Halbach array is introduced into the consequent-pole structure to establish the dual rotor consequent-pole vernier motor with Halbach array (DRCPVM-HA). Halbach array reduces flux leakage and improves the magnetic circuit. And Halbach array is employed to discuss the design of the magnetization angle. The rule of the electromagnetic performance changing with the magnetization angle is studied to find the optimal magnetization angle in the Halbach array. When the magnetization angle is 45° in DRCPVM-HA, the torque is significantly improved, the torque ripple is reduced, and the utilization rate of PMs is improved.

Keywords

• Vernier motor
• outer rotor
• inner rotor
• magnetization angle
• Halbach array