A New Rotor Dislocation Permanent Magnet Assisted High Speed Reluctance Motor for Improving Power Density and Reducing Torque Ripple

Abstract

Switched reluctance motor has been widely used in various fields because of its simple, solid structure and high reliability. However, the disadvantage of large torque ripple limits its application in highspeed occasions. In this paper, a new type of rotor dislocation permanent magnet assisted high-speed reluctance motor (RDPMA-HSRM) is proposed, which realizes the axial magnetic flux through the structure of two groups of stator and rotor, and a permanent magnet is connected in series for auxiliary excitation. On this basis, the rotor dislocation is developed and a unique structural design is developed. The working principle of the motor is explained, the magnetic circuit model of the motor is analyzed, the mathematical model of the motor is given, and the contribution of permanent magnet assistance to torque is discussed. The magnetic characteristics of the motor in terms of flux density, flux linkage, inductance and torque are obtained by finite element simulation, and compared with the characteristics of the improved motor. The effects of rotor misalignment and permanent magnet auxiliary excitation on the performance of the motor are analyzed. Finally, the prototype is tested and the experimental results are obtained. Simulation and experimental results show the RDPMA-HSRM has smaller torque ripple and higher torque density INDEX TERMS Torque ripple, rotor dislocation, permanent magnet assisted, axial flux, high speed