基于虚拟电流采样的永磁同步电机驱动无传感器控制反电动势精度提升

The extended back electromotive force (BEMF) of permanent magnet synchronous motors (PMSMs) can be directly calculated according to the current derivative, thereby observing the rotor position. To avoid being limited by the short duration of zero-voltage vector, the twice current samplings can be completed at the beginning and middle of the control cycle. However, the current between two samples i...