At high and low speeds, the back potential is not the same, but the flux linkage of the rotor is basically similar. If the flux link is used as the observation object, the negative effects of SNR and nonlinear factors at low speed can be avoided. Based on the principle of flux model, this paper builds a flux observer model. The test results show that it can run stably at low speed, has strong load capacity, smooth switching at low speed and high speed, and fast convergence at high speed.
In order to solve the problems of permanent magnet synchronous motor under disturbance conditions, the motor overshoot is too large and the anti-interference ability is not strong. Based on Matlab\Simulink, a vector control system model of PMSM based on active disturbance rejection control and double closed-loop PI control is established. Under the same motor parameters and simulation conditions, the speed, electromagnetic torque and three-phase current response of permanent magnet synchronous motor under ADRC control were studied and the simulation results were compared with the traditional double closed-loop PI control system. The experimental results indicate that the ADRC has obvious advantages in restraining speed overshoot and improving speed response of PMSM. It has better robustness and control performance.
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