关键词: 双边励磁, Halbach 阵列, 磁场调制, 外转子永磁电机, 有限元

Abstract: In order to solve the problems of low torque density and high calorific value of traditional external rotor permanent magnet motors, a bilateral Halbach external rotor permanent magnet motor using magnetic field modulation principle is proposed. The structure of bilateral Halbach external rotor motor and permanent magnet arrangement were introduced,the operating principle of the motor and the magnetization principle of Halbach array were analyzed, and the expressions of no-load back electromotive force and electromagnetic torque of the motor were obtained according to the operating principle and working magnetic-dense harmonics. The finite element simulation analysis and verification of the motor were carried out, and the no-load air gap magnetic density, no-load back EMF, d, q shaft inductance and electromagnetic torque of unilateral vernier permanent magnet motor,bilateral permanent magnet motor and bilateral Halbach permanent magnet motor were compared. The torque density and motor efficiency of the bilateral Halbach motors are superior than those of the other two types of motors.