基于滑模观测器的永磁同步电机无传感器矢量控制

为解决永磁同步电机（PMSM）控制中机械式位置传感器带来的成本及可靠性等问题，将滑模观测器技术应用到PMSM矢量控制系统中。该系统采用滑模面及滑模等效控制方法，通过选择足够大的滑模增益，在观测电流和实测电流之间的误差上构建滑模面，对电机反电势进行观测以得到转子位置角，并基于Lyapunov稳定性判据对滑模观测器的收敛性进行了分析；建立了应用滑模观测器的PMSM无传感器矢量控制实验系统，设计了位置及速度滑模控制器。进行了1500r／min稳态及正负转速切换的角度估算实验，实验结果验证了该方法的有效性。研究结果表明，基于滑模观测器的无传感器控制策略能准确估计出PMSM的转子位置角，从而得到转子速度，且系统具有较好的动、静态特性。

Sensorless vector control of PMSM based on sliding mode observer

In order to eliminate the problems of cost and reliability that caused by the mechanical sensor of the permanent magnet synchronous motor（PMSM） drives, a novel nonlinear control strategy based on sliding mode observer was investigated. The sliding surface was defined on the errors between the actual and estimated currents. The estimated back-EMF was observed to calculate the angle and speed of the rotor by using a sufficient sliding gain. The stypticity of sliding observer based On Lyapunov was analyzed. The hardware and software of the proposed sensorless vector control based on sliding mode observer was implemented. The steady state of 1 500 r/min and the transient response of positive to negative speed tests were evaluated. The experimental results show that proposed sliding mode observer algorithm is effective to estimate the rotor position of the PMSM and has good steady and transient response.