Method and device for controlling speed of permanent-magnet synchronous motor

Abstract

The invention discloses a method and a device for controlling speed of a permanent-magnet synchronous motor. The method includes that an active-disturbance-rejection control technology is adopted for a speed ring, speed setting and a speed detection value are taken as input of a first-order active-disturbance-rejection controller, a tracking differentiator reasonably arranges a transition process, an extended state observer observes an actual value of rotating speed of the motor, estimates total disturbance of a system and acquires output of the speed ring through a nonlinear state error feedback control ratio, a load torque observer is designed through detection values of a current and the speed, and observed load torque through output of a feedforward controller and the active-disturbance-rejection controller is taken as reference input of a quadrature-axis current. The method carries forward characteristics of overshoot freeness, high disturbance rejection capacity, good robustness and the like of the permanent-magnet synchronous motor in speed control in the active-disturbance-rejection control technology, and compensation is performed on the problem of load disturbance, so that the problem of fluctuation of the rotating speed under the circumstance of load disturbance is improved.

Description

technical field [0001] The invention relates to synchronous motor control technology, in particular to a speed control method and device for a permanent magnet synchronous motor. Background technique [0002] At present, the speed control of permanent magnet synchronous motor is mainly based on vector control technology, and direct torque control has also been applied in some special occasions. The invention is based on The vector control technology, using The structure of the permanent magnet synchronous motor control system based on the vector control technology is as follows: figure 1 As shown, the current of A and B two phases is obtained through the current sensor, and the direct axis current is obtained through CLARKE and PARK transformation and quadrature current , as the current feedback value of the two current loops; in addition, the position and speed of the rotor are calculated by the encoder, and the position of the rotor is used for PARK and its inverse...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a permanent magnet synchronous motor speed control method and device to solve the problem of large speed fluctuations under load disturbance in the permanent magnet synchronous motor speed control, so as to improve the energy efficiency of the permanent magnet synchronous motor and reduce motor noise

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