Feedback Decoupling Control of Bearingless Synchronous Reluctance Motor

The whole mathematics model of bearingless synchronous reluctance motor (BSRM) is derived. Under the load, the main problem is coupling between radial forces and electromagnetic torque, and between the two radial forces in two axes. The bearingless synchronous reluctance motor is a multivariable nonlinear strongly coupled system. In this paper, feedback decoupling control method based on the motor´s actual parameters has been proposed, this method overcomes feed-forward compensation drawback that needs exact matching between given parameters and actual parameters, the coupling between those variables is canceled by using feedback decoupling, and the control system can be realized easily. The simulation results have validated that stable suspension operation and excellent decoupling control effect can be achieved, and good dynamic and static control performance of the motor can be also obtained.