Sensorless permanent magnet synchronous motor control method based on high power slide mode

Abstract

The application discloses a sensorless permanent magnet synchronous motor control method based on high power sliding mode, relates to the technical field of permanent magnet synchronous motor control, and comprises the following steps: the following steps are included: step one: determining the given speed omega of a permanent magnet synchronous motor * , determining the given current of a d-axis, determining the d-axis current i d of the permanent magnet synchronous motor, determining the q-axis current i q of the permanent magnet synchronous motor, estimating the rotor speed and rotor position of the permanent magnet synchronous motor; step two: calculating the difference between the given speed omega * and the rotor speed, and inputting the difference into a sliding mode controller; the sliding mode controller calculates the q-axis given current of the permanent magnet synchronous motor; the application generates high-frequency current through the sliding mode control, so that the permanent magnet synchronous motor position can be obtained without additional injection of high-frequency current, and the torque pulsation of the permanent magnet synchronous motor is also reduced relative to the method of additional injection of high-frequency current.

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