Design and Characteristic Analysis of a New Dual-Stator Bearingless Switched Reluctance Motor

Abstract

This paper proposes a 18/15/6 pole dual-stator bearingless switched reluctance motor (DSBSRM) with better overall performance. The proposed motor separates the torque control system and the suspension control system with a magnetic isolation ring. The torque drive system adopts the method of optimizing the distribution and quantity of the stator and rotor tooth poles, which reduces the hysteresis force that exists during the commutation of the electromagnetic poles and improves the torque output capacity and the electromagnetic conversion efficiency. The suspension control system adopts hybrid excitation differential control method. This method increases the electromagnetic induction intensity of the suspension system at a small current and thus improves the levitation force output capability and control accuracy. The mathematical model of the 18/15/6 pole DSBSRM was established. The torque mathematical model adopts the Maxwell stress integral method after path optimization, and the levitation mathematical model is established with full consideration of the rotor offset problem to ensure the accuracy of the mathematical model. Ansoft Maxwell 2D software was then used to simulate the 18/15/6 pole DSBSRM in 2D. While verifying the correctness of the mathematical model, the characteristics of the motor were analyzed and the influence of key parameters such as control current and air gap thickness on the performance of the motor was analyzed. In order to further highlight the excellent performance of 18/15/6-pole DSBSRM. Compare 18/15/6 pole DSBSRM with new 16-phase BSRM and 12/8/4 pole DSBSRM. Structural decoupling method is used in all 3 motors. The results show that the proposed 18/15/6-pole DSBSRM has better performance in terms of torque and suspension output capacity and decoupling performance.