Decoupling Control And Unbalance Compensation Of Rotor On Bearingless Permanent Magnet Slice Motors

The bearingless permanent magnet slice motor is a new design idea revolution in traditional of structure and electric drive field, which adopted the bearingless technology to realize the radial suspension and the suspension of the other 3 degrees of freedom by the reluctance forces, respectively. As the bearingless permanent magnet slice motor has all advantages of magnetic bearings, and can solve difficult problems in special electric drives. And it has a wide range of applications like in chemical processing industry, life science, semiconductor manufacturing industry and so on.In the dissertation, beginning from the principle of bearingless permanent magnet slice motor, the complex coupling system of decoupling control method is introduced, and the rotor control of mass unbalance compensation is designed, the correlation mathematical model is established, and control algorithm is deduced. Moreover, the control system is established and performance simulation is accomplished with MATLAB toolbox. Then the digital control system is designed. Main research works are as follows.Firstly, the structure and operation principle of bearingless permanent magnet slice motor is studied, suspension principle of bearingless permanent magnet slice motors is introduced. The mathematic models of radial suspension forces and rotation part of the bearingless permanent magnet slice motor are deduced, and based on the feature of bearingless permanent magnet slice motor, the control system adopting rotor flux oriented is designed.Secondly, according to the theory of nonlinear differential geometry, the coupling system of the bearingless permanent magnet slice motor between the radial suspension forces and current is reduced to decoupled linear subsystems and the Neural Network Sliding Mode Variable Structure controller is designed. Furthermore, the feasibility of the method is validated by the results of simulation.Thirdly, the rotor vibration control on the bearingless permanent magnet slice motor is completed based on the decoupling control of the electromagnet torque and radial suspension forces, and an unbalance feedback compensation technique is designed. The control system is established and performance simulation is accomplished with MATLAB/SIMULINK toolbox. The research results have shown that the control system can reduce the rotor vibration amplitude.Finally, the digital control system of the bearingless permanent magnet slice motor is set up, and the flowcharts of each software function block and the correlation experiments are presented. The validity of the digital control system is verified by experiment results.