A Novel 24 / 15 pole Bearingless Switched Reluctance Motor and Sensorless Speed Control

In view of the problems of small levitation force and negative torque in the traditional bearingless switched reluctance motor, a new 24/15 pole bearingless switched reluctance motor with hybrid rotor tooth structure is proposed. The rotor teeth are divided into torque teeth, levitation teeth and support teeth to increase the pole arc of support teeth and reduce the influence of levitation force on torque. The performance of the motor is simulated and verified by Maxwell 2D. The results show that the suspension performance of the structure is better and the torque output is improved. At the same time, in order to reduce the volume and cost of the motor, the sliding mode observer is used for sensorless control of the motor. The motor model and sliding mode observer model are built and simulated in Matlab / Simulink. The simulation results show that the control method can effectively estimate the motor speed with small error and high tracking accuracy.