为了实现永磁同步电机（PMSM）宽速度范围无传感器控制，提出了一种基于改进滑模方法的宽速度无位置传感器控制策略。在电机中高速阶段，为抑制传统滑模观测器的固有抖振问题设计了一种新型滑模趋近律，来提高电机转速估计精度；在电机零低速阶段采用脉振高频注入法估计电机转速。此外，设计了一种平滑切换控制策略，实现不同算法间的平滑切换。对比仿真结果验证了所设计控制器具有良好的转速估计和跟踪性能，且能实现不同控制算法的平滑切换。

In order to realize the position sensorless control of permanent magnet synchronous motor （PMSM） with wide speed range, a wide speed position sensorless control strategy based on the improved sliding mode method is proposed. In the medium and highspeed stage of the motor, a new sliding mode reaching law is designed to suppress the inherent chattering problem of the traditional sliding mode observer. Thus, the estimation accuracy of the motor speed is improved. In the zero and low speed stage of the motor, the pulsating high frequency injection method is used to estimate the speed of motor. In addition, a smooth switching control strategy is designed to achieve smooth switching between different algorithms. The comparison of simulation results verifies that the designed controller has good speed estimation and tracking performance, and the smooth switching of different control algorithms can be achieved.

国家自然科学基金会资助项目（52037005）；中国博士后科学基金会资助项目（2018M632622）；山东省高校青年创新科技支持计划资助项目（2019KJN033）