Sensorless permanent-magnet synchronous motor starting control method and corresponding system

Abstract

The invention relates to a sensorless permanent-magnet synchronous motor starting control method and a corresponding system. The method comprises the following steps of (1) setting a current command I of a q axis of a permanent-magnet synchronous motor stator side in vector control to be 0, and controlling a current command I of a d axis within a rated current value of a set multiple; (2) gradually increasing a given value Angle of a planned rotor angle to 360 degrees from 0 degree; and (3) judging whether starting of a permanent-magnet synchronous motor is completed or not; if the motor starting is completed, entering the vector control of a voltage outer ring and a current inner ring; if the motor starting is not completed, returning back to the step (1) and starting again. A method based on current closed-loop control is used for zero correction on a motor rotor, the permanent-magnet synchronous motor is controlled according to the currents of the q axis and the d axis of the permanent-magnet synchronous motor stator side, and the over-current is prevented since the currents of the q axis and the d axis can be controlled; the motor can be ensured to be prevented from being out-of-step during the starting process by planning the rotor angle and reasonably using constant angle acceleration step size.

Description

technical field [0001] The invention belongs to the field of motor servo control, and in particular relates to a sensorless permanent magnet synchronous motor starting control method and a corresponding system. Background technique [0002] Permanent magnet synchronous motors are widely used in the field of industrial control because of their high power density, low loss, and high reliability. The control of permanent magnet synchronous motor needs to obtain reliable rotor position information, and rotor position sensors such as resolvers or encoders are often used for measurement. These devices add cost to the system and are difficult to install. Therefore, the sensorless control method has become a research hotspot, but if the control is not done properly, problems such as out-of-step and over-current may occur. Commonly used sensorless control methods for permanent magnet synchronous motors include "back electromotive force method", "high frequency signal injection meth...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sensorless permanent magnet synchronous motor starting control method and a corresponding system to solve the problem of out of step in the permanent magnet synchronous motor starting control method in the prior art

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