基于SMO的改进型转子位置检测方法

针对无位置传感器永磁同步电机（PMSM）在高速运行时无法准确观测转子位置，导致三相电流波动畸变的问题，提出了一种改进型滑模观测器（SMO）来预估转子位置和速度的新方法。该改进型滑模观测器采用S型切换函数来估算反电动势，并通过软件锁相环（SPLL）算法计算转子位置角，降低了传统滑模观测器抖振对转子位置角的影响，实现了PMSM在高速运行状态下转子位置角的准确观测。开发出一套高速永磁同步电机控制器，实现了电机在超高速高功率状态稳定运行。 

Improved rotor position detection method based on SMO

Due to the problem that the rotor position of sensorless Permanent Magnet Synchronous Motor (PMSM) cannot be accurately observed at high speed, which causes distortion of three-phase current fluctuation, an improved Sliding Mode Observer (SMO) is proposed to estimate the rotor position and speed more precisely. A function is adopted to be the switching function of the SMO to eliminate the fluctuation in the calculation of the back-EMF. Furthermore, a Software Phase Locked Loop (SPLL) algorithm is introduced to decrease the influence of chatting of traditional sliding mode observer on rotor position. The combined method significantly improves the observation accuracy of the rotor position angle at high speed. A controller of high speed PMSM is successfully developed and can works steadily under ultra-high speed and high power condition.