一种PMSM无位置传感器FOC控制的滑模观测器设计

A design of sliding mode observer for speed-sensorless FOC control of PMSM

永磁同步电机无传感器控制技术不但能够降低系统成本,而且能够增加系统的可靠性。为实现永磁同步电机无位置传感器运行,提出了一种基于自适应滑模观测器的非线性速度/角度估算方法。基于永磁同步电机的数学模型,根据实测电流与估算电流之间的误差构成滑模面,将反电动势估算值反馈引入到电机电流观测中。为简化调速系统的硬件结构,设计了一个截止频率可随转速变化的低通滤波器。

Sensorless control of PMSM has been a hot research topic of motor control technology, which has the advantages of low cost and high reliability.A nonlinear adaptive sliding mode speed/position observer was proposed for sensorless control of PMSM.The sliding was defined based on the errors between actual and estimated currents. Estimates of the back-EMF feedback introduced to the observation of the motor current.In ord-er to simplify the hardware structure of the speed control system, a low pass filter with a cutoff frequence changing with the rotor speed was designed.