Design accuracy and magnetic field analysis of a dual-armature bearingless flux reversal motor

Abstract

A dual-armature bearingless flux reversal motor (DBFRM) is proposed. The permanent magnet in the motor is located on the stator side, the armature winding is located on the stator side and the rotor side, the suspension winding is located at the stator side, the rotor teeth are embedded in the slotted non-magnetic material rotor barrel, and the stator and rotor cores are made of laminated silicon steel. The DBFRM demonstrates the characteristics of high speed, long life, and fast dynamic response and has unique advantages in power energy saving and energy storage. Compared with the traditional bearingless flux reversal motor, the DBFRM shows better fault tolerance. Based on the theory of air-gap magnetic field modulation, the torque and the levitation mechanism of the motor are expounded from four perspectives—permanent magnetic field, armature reaction magnetic field, electromagnetic torque, and levitation force—which lays the foundation for the establishment of an accurate mathematical model of levitation force and torque.