Research On Sliding Mode Control Of Permanent Magnet Synchronous Counter-rotating Motor

For the rotating permanent magnet motor drive system,a special counter-rotating motor is often used,that is,a single stator and a double rotor counter-rotating permanent magnet synchronous motor.Compared with traditional marine motors,the motor has many advantages such as small size,compact structure and light material quality.Therefore,it has been widely praised and applied in the field of marine equipment.However,there are still some problems in the application field of this motor.For this reason,many scholars have carried out a series of research on it,and the existing research often uses the traditional PI control,which is prone to long adjustment time and overshoot.A number of shortcomings.In order to solve the stability problem of the rotating motor,the new technology can be more widely used in various fields.In this paper,the principle of the motor system is deeply analyzed,and the electromagnetic principle and corresponding mathematical model of the pair of rotating machines are demonstrated.The simulation model of the rotating motor is established by Matlab / Simulink software,and the realization process of the model is detailed.The simulation results are consistent with the theoretical analysis.The establishment of the model provides a basis for the optimization of the control strategy of the rotating motor.In order to improve the dynamic adjustment characteristics of the rotating machine,this paper proposes a sliding mode control method based on the improved approach law.Using the approach law method,a kind of rotary motor sliding mode speed regulator is designed and simulated on Matlab.Compared with the simulation results of PI regulator,it can be seen that the controller improves the rotary motor speed control system.Stability,rapidity and robustness effectively suppress overshoot under PI control.However,its shortcomings such as chattering problems limit its application in practical engineering.To this end,this paper introduces fractional-order calculus theory and further proposes a fractional-order sliding mode control strategy.The simulation and experimental results show that the fractional-order sliding mode control system has no chattering after being disturbed by the load.Compared with the improved sliding mode control,the system can return to the steady state faster,and the weakening effect on the chattering is more obvious..Therefore,the fractional-order sliding mode control system can not only suppress the chattering,butalso maintain the robustness of the traditional sliding mode control system to the disturbance and parameter changes,thus optimizing the control system of the rotating motor.