Efficient acceleration control method for permanent-magnet synchronous motor

Abstract

The invention relates to an efficient acceleration control method for a permanent-magnet synchronous motor. The efficient acceleration control method comprises the steps as follows: the rotating speed of the permanent-magnet synchronous motor is detected in real time and is compared with a target rotating speed; when the rotating speed of the motor is less than k (k is less than or equal to 1) times of the target rotating speed, the permanent-magnet synchronous motor enters an efficient acceleration control mode; the torque axis current iq reaches the maximum stator current value ilim under the limiting conditions of an inverter and the permanent-magnet synchronous motor to obtain the maximum electromagnetic torque, so that the motor always approaches the target rotating speed at the maximum acceleration; the steps are an open-loop control stage; when the rotating speed of the motor reaches k times or more of the target rotating speed, the permanent-magnet synchronous motor quits the efficient acceleration control mode, enters a stable control mode, and is switched into a vector control strategy of id=0; and the permanent-magnet synchronous motor enters double closed-loop control of the current and the rotating speed, so that the motor relatively stably approaches the target rotating speed; and the system stably runs at the expected rotating speed. According to the method, when the permanent-magnet synchronous motor is started or the preset rotating speed greatly changes, the target rotating speed can be reached as soon as possible; the acceleration time of the motor is greatly shortened; and the efficient acceleration control method is simple in structure and easy to realize.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to a high-efficiency acceleration control method for a permanent magnet synchronous motor. Background technique [0002] With the emergence of new power electronic devices GTO, IGBT, etc., the synchronous motor speed control system has developed to a new stage. The permanent magnet synchronous motor speed control system has good static and dynamic characteristics and is suitable for use in machine tools, robots and flexible manufacturing systems. middle. The rotor of the motor is excited by permanent magnets, which eliminates the loss of rotor excitation. Nowadays, permanent magnet synchronous motors are widely used because of their advantages such as convenient maintenance, strong controllability, low environmental impact, high motor efficiency, and high power factor. Permanent magnet synchronous motors are developing towards high power, high speed, high efficiency and miniat...

AI Technical Summary

Problems solved by technology

[0004] However, various existing motor control strategies still have various deficiencies. The algorithm structure of vector control technology is relatively complex, and it is necessary to decouple the AC and DC axis currents of the motor. It is difficult to implement and requires relatively high requirements for the controller. , and its response to speed is slow, and its anti-interference ability is poor; direct torque control technology has poor speed regulation performance at low speed; modern control theory and intelligent control research mostly stay at the theoretical stage

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