Decoupling control of 5 degree-of-freedom bearingless permanent magnet synchronous motor based on /spl alpha/-th order inverse system method

A decoupling control method based on /spl alpha/-th order inverse system method has been developed for the innovative 5 degree-of-freedom (DOF) bearingless permanent magnet synchronous motor (BPMSM), which is multi-variable, nonlinear and coupling system. Firstly, the innovative 5 DOF BPMSM is briefly introduced; Secondly, the state equations of the innovative 5 DOF BPMSM are set up. Then feasibility of decoupling control based on /spl alpha/-th order inverse system method for the innovative 5 DOF BPMSM is discussed in detail, and the dynamic decoupling control algorithm based on inverse system is also deduced. Finally, the simulation results have shown that this kind of control strategy can realize dynamic decoupling control between torque force and radial suspension forces, and the whole control system has good dynamic and static performance.