Study On Inverse System Dynamic Decoupling Control Strategy Of Bearingless Induction Motor

Bearingless motor is a new type of machine that integrates the function of rotor radial suspension and rotary actuation control. Bearingless motor has the advantages of no lubrication, no friction and no abrasion that the magnetic bearing motor has, in addition, it has more advantages as simple structure, high space utilization and high electromagnetic efficiency and so on. Therefore, bearingless motor has a broad application prospect. However, bearingless motor is a multi-variable, nonlinear and strong-coupling system. In order to achieve good control performance, it is necessary for bearingless motor to decoupling. For the multi-variable、nonlinear and strong-coupling problems of three-phase bearingless induction motor, the decoupling control strategies based on inverse system method has been used to realize decoupling control in this paper：1. Inverse decoupling control method is researched based on rotor flux orientation, inverse model is built, and inverse system decoupling control strategy with considering stator current dynamic is proposed. The simulation result showed that: to reduce the dependence on the motor parameters, the methods of inverse dynamic decoupling control based on stator field orientation were researched for bearingless induction motor.2. To reduce the dependence on the motor parameters, the inverse system model based on stator flux orientation for bearingless induction motor is built, and the inverse control strategy based on stator flux orientation with considering stator current dynamic is proposed. From the simulation results it can be showed that: with the inverse system decoupling control method based on stator field orientation, not only the system can have a good dynamic decoupling control performance, but also can reduce the influences caused by motor parameters effectively.3. On the basis of flux orientation inverse control is adopted for torque system, the independent control method for suspension system is researched and analyzed. The simulation result showed that the algorithm of this method is simple, and the decoupling control effects are good.