Research And Realization Of The Control Strategy For Pmsm Servo System Based On Auto-disturbances Rejection Controller

Permanent magnet synchronous servo control system is widely used in open CNC machine. However, permanent magnet synchronous motor is a nonlinear, strong coupling, multi-parameter perturbation variable system, so demanding for the control strategy. In this paper the research methods based on the vector control strategy, no mechanical sensorless vector control strategy, direct torque control strategy are studied, and ADRC is applied to improve the systen performance. Then a DSP-based multi-axis motion control card is built as an experimental platform. The simulation and experiment on permanent magnet synchronous servo system control strategy are verified in this basis.The PMSM vector control theory is analysed, and a control strategy based on permanent magnet synchronous motor is introduced to the control strategy. First, a strategy based on ADRC is proposed to estimated and compensated the disturbances. Second, a DSP-based multi-axis motion control card is designed. Simulation and experimental results show that the vector control system is simple, and will improve the stability, robustness and adaptability in the system significantly.The PMSM sensorless vector control theory is analysed, and a control strategy based on permanent magnet synchronous motor is introduced to the control strategy. The rotor position and speed will be estimated by an ESO and a NTD, and the accurate closed-loop control will be achieved on this basis. Simulation and experimental results show that the control system is simple, and will give fast, accurate position control results.The PMSM direct torque control theory is analysed, and a control strategy based on permanent magnet synchronous motor is introduced to the control strategy. In this method, the stator flux is chosen as state variables, and the uncertain component including the rotor speed is extended into a new state variable. Then the stator flux and speed can be obtained by ESO timely. Simulation and experimental results show that the new control strategies improve the system dynamic,static performance and robustness significantly.In order to verify the effectiveness of the control strategy for permanent magnet synchronous servo, the paper developed a DSP-based multi-axis motion control card and described the system hardware and software architecture, implemented on this basis, the effective control of permanent magnet synchronous current.