Study On The Power Magnetic Bearing Control System

Power Magnetic Bearing (short for PMB), which combines magnetic levitation bearing with the drive winding, is a kind of new bearings. Because the levitation windings and the torque windings of PMB are overlapped in the stator slots, and the rotating magnetic field activated by torque winding is used to generate the offset magnetic field of engendering levitation force, the space utilization ratio and electromagnetic efficiency is greatly improved.In this dissertation, the mathematical model of magnetic levitation force is built on the basis of the main principle of levitation of the PMB, and the equation of motion of the magnetic levitation force and torque are attained. Vector control technology is proposed on the torture windings, with the flux field oriented vector arithmetic, the amplitude value and phase angle of air-gap flux are attained. And then the decoupling control between the torque and magnetic levitation force is achieved, and the levitation control of rotator is realized, as provide theoretical foundation for the control system design of PMB.A digital control system based on single-DSP (TMS320LF240A) is designed. It can monitor the parameters of the rotator displacement, velocity, phase currents of the windings and other parameters, and process the signal. According to the model parameter and Characteristic, the software flow chart is designed, and each module of realization of DSP of the system is described. Then it is debugged under the CCS2.2 environment, at last the software design of the whole control system is completed.Besides, this dissertation simulates the whole control system using the Simulink of the MATLAB, and the simulation results are analyzed, the control system is adjusted, and then the feasibility of the control algorithm is verified.