Yan Langtao, Liu Guangyin, and Ren Yiran
Linear motor, control, modelling, sliding mode, simulation
A three closed-loop control strategy based on current, speed, and displacement parameters is proposed to solve the control problem of speed and position for bilateral permanent magnet linear motors. Combining the idea of zero d-axis current-component and space vector pulse width modulation, the current loop control is achieved by using a second-order super-twisting sliding mode control algorithm in the current controller. The position controller adopts a first-order sliding mode control based on exponential convergence law to track contour errors, enabling position control to be achieved, which has the function of reducing high-frequency chattering, improving the dynamic performance of the control process. The design scheme of the control system was simulated and verified using MATLAB/Simulink software. The variation trend of the simulated waveform and the relationship between the parameters were consistent with the physical parameters of the actual motor operation. The change process and smoothness of the simulated waveform proved the good performance of the control system.
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