Position Sensorless Control for Permanent Magnet Synchronous Motor Based on Sliding Mode Observer and Sliding Mode Controller
Chen Siyi1, Pi Youguo2
1. Key Laboratory of Autonomous Systems and Network Control Ministry of Education South China University of Technology Guangzhou 510640 China; 2. School of Automation Science and Engineering South China University of Technology Guangzhou 510640 China
Abstract：In this paper, a scheme of sensorless detection based on sliding mode observer is proposed for the position sensorless control system in permanent magnet synchronous motor (PMSM). By analyzing the estimation errors existed in sliding mode observer at low speed that lead to starting failure under sensorless control strategy, a method for PMSM running with constant volt/hertz (V/F) is proposed. Considering the following performance of current and motor speed in sliding mode observer (SMO) and sliding mode controller (SMC) respectively, a time-varying item is introduced. It can achieve the smooth transition from constant V/F method to self-controlled method in speed control system, and also can improve the convergence rate of the sliding mode surface. Simulations and experiments demonstrate that the proposed control strategy can not only solve the dead-zone of SMO at standstill and low speed, but also reduce the chattering in the switching process between the two control methods.
陈思溢, 皮佑国. 基于滑模观测器与滑模控制器的永磁同步电机无位置传感器控制[J]. 电工技术学报, 2016, 31(12): 108-117.
Chen Siyi, Pi Youguo. Position Sensorless Control for Permanent Magnet Synchronous Motor Based on Sliding Mode Observer and Sliding Mode Controller. Transactions of China Electrotechnical Society, 2016, 31(12): 108-117.
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