关键词: 永磁同步电机, 滑模观测器, 无位置传感器矢量控制

Abstract:

A startup strategy, which was suitable for the position sensorless field oriented control (FOC) based on back-EMF, was studied.A control method of speed open-loop and current close-loop was used at the state of startup, while a double-closed-loops of speed and current one was employed in running state.In order to make the control strategy switched rapidly and smoothly, two transition states were added.The first transition state declined the current of q-axis, thus the error angle between given-coordinate and estimated-coordinate was decreased.Second one was that the rotor position information used for the FOC was changed from given speed's integral one to estimated one.Then the transition state was finished.The experimental results verify that the strategy was correct and feasible.

Key words: permanent magnet synchronous machines (PMSM), sliding mode observer (SMO), position sensorless FOC