Speaker
Description
The magnetic field modulation type magnetic gear composite motor is a new type of motor integrating magnetic gear and permanent magnet brushless motor. Its advantage is that it has higher torque density and efficiency, and has a good application prospect in the field of low speed and large torque. According to the principle of magnetic field modulation, the air gap magnetic field of the magnetic gear composite motor is complex and the harmonic content is rich. In order to improve the air-gap magnetic field distribution and increase the torque density, this paper proposes a magnetic-gear composite motor with irregular Halbach array and superconducting magnetic ring. The permanent magnets of the motor are magnetized by an irregular Halbach array, and the unilateral magnetization effect can strengthen the magnetic field at the air gap side and weaken the magnetic field at the core yoke. Using superconducting modules to replace the epoxy resin in the conventional magnetic tuning ring can enhance the magnetic tuning effect of the magnetic tuning ring. Finally, a finite element model with the pole pairs of 4 and 18 for the inner and outer rotors is established. By comparing with the conventional magnetic gear compound motor, it was found that the air gap magnetic density and back EMF of the motor were high in sine, the torque increased by 30.12%, and the torque ripple was reduced by 20.64%.
