The decoupling control of bearingless synchronous reluctance motor based on differential geometry

A bearingless synchronous reluctance motor (BSRM) is a multivariable, strong-coupled, complicated nonlinear system. The decoupling control of electromagnetic torque and radial suspension forces and between the two radial forces in x-and y-axes is the key technology of the stable operation for the BSRM. In the paper, the principle of radial suspension forces for the BSRM is expounded, and then the mathematical models of radial suspension force subsystem and torque subsystem are set up. A control system based on differential geometry theory is designed. The control system is simulated with Matlab/Simulink software. Simulation results show that the rotor can be suspended steadily, the control strategy can realize decoupling control among torque and radial suspension forces, and the control system has good dynamic and static performance.