The Fast Control Strategy Of Permanent Magnet Synchronous Motor Without Proportional Integral Controller

With the proposal of Made-in-China 2025,high-performance permanent magnet synchronous motor(PMSM)has been widely used in high-end manufacturing industry.In order to meet the high-precision requirements of the fast-developing manufacturing industry,a control method of fast permanent magnet synchronous motor without PI controller is proposed.This method combines the advantages of speed sliding mode and current prediction,and forms a fast-controlled servo control system,which improves the dynamic response performance of the system and also enhances the robustness of the system.This research is in the leading position of high-end manufacturing industry.Domain has practical application value.In this paper,the surface mounted permanent magnet synchronous motor(PMSM)is used as the experimental and research model.According to the principle of three-phase to two-phase conversion,static to rotation conversion,the mathematical models of different reference systems are derived.Then the modulation theory of SVPWM is discussed in depth,the structure of traditional vector control is analyzed in detail,and a series of simulation validation is completed.The PI controller of current inner loop is replaced by model prediction.The single and double vector predictive control and deadbeat predictive control of current prediction are deduced in detail.Then the three different control strategies are simulated and compared.The simulation results show that the two current prediction methods have faster response speed and higher steady-state and dynamic accuracy.Among them,deadbeat current prediction method has simpler structure and better control effect.The sliding mode control strategy with disturbance observer replaces PI control strategy with speed outer loop.The system has good anti-interference ability.In this paper,the integral sliding mode is deduced theoretically.In order to adapt to the control of digital chip,the sliding mode is discretized.In order to reduce the inherent buffeting of sliding mode and the disturbance of load to the system,a sliding mode observer of load torque is designed as feed-forward compensation.The simulation results show that the control method has high control accuracy and strong robustness.Based on vector control and permanent magnet synchronous motor(PMSM),the deadbeat current predictive controller is used to replace PI current regulator,and the speed sliding mode controller with feedforward compensation is used to replace PI speed regulator,which achieves the goal of high performance control of PMSM.The experimental results show that the combined control strategy not only improves the response speed of the control,but also brings strong anti-interference ability to the system.