高频信号注入法解决了永磁电机无速度传感控制在零速和低速运行时的许多难题，但是动态性能较慢也是一大不足。针对高频注入永磁同步电机(PMSM)无速度传感器控制动态响应问题，提出了一种基于变结构滑模控制改进的锁相环(PLL)结构。该结构在传统的PLL基础上，通过对高频信号调解后的PLL输入信号进行滑模控制从而提升PLL的动态性能。该方法比传统的PLL结构增强了系统的动态响应能力，且不需要电机参数，由于变结构滑模函数的引入,也增强了系统的鲁棒性能。仿真和试验结果证明，该方法缩短了电机动态响应时间，减小了动态响应过冲，证明了改进算法的可行性与有效性。

The high-frequency signal injection method solves many of the problems of the permanent magnet motor without speed sensing control in zero- and low-speed operation, but its slow dynamic performance is also a major shortcoming. To address the dynamic response of high-frequency injection permanent magnet synchronous motor (PMSM) with speed sensorless control, an improved phase locked loop (PLL) structure based on variable structure sliding mode control is proposed. The structure is designed based on the traditional PLL, and the dynamic performance of the PLL is improved by performing the sliding mode control on the input signal of the PLL after the high-frequency signal is mediated. Compared with the traditional PLL structure, the method enhances the dynamic response of the system, and does not require motor parameters, and enhances the robustness of the system due to the introduction of the variable structure sliding mode function. Simulation and experimental results prove that the method shortens the motor dynamic response time and reduces the dynamic response overshoot, which proves the feasibility and effectiveness of the improved algorithm.