关键词: 永磁同步电机, 无位置传感器控制, 变指数趋近律, 滑模控制器, 高阶滑模观测器

Abstract: In response to issues such as poor dynamic response, large overshoot, and low accuracy in traditional PI control for permanent magnet synchronous motor speed regulation without position sensors, a sensorless control strategy based on an improved double sliding mode algorithm was proposed. A novel variable exponent convergence law was introduced. On this basis, the sliding mode velocity controller was designed using the differential integral sliding mode theory and a novel switching function to replace the traditional P I controller. An extended state observer was incorporated to compensate for unknown disturbances, enabling disturbance rejection in the speed loop through composite sliding mode control. A high-order sliding mode observer was designed based on the Super-Twisting algorithm, and an orthogonal phase-locked loop was employed to extract velocity and position information. Simulation results demonstrate that the proposed improved double sliding mode control strategy effectively enhanced the dynamic control performance of the system, improved observation accuracy, and exhibited superior disturbance rejection capabilities.

Key words: permanent magnet synchronous motor ( PMSM), position sensorless control, variable exponent reaching law, sliding mode controller, high-order sliding mode observer