High torque starting method for high power alternating current (AC) servo driver

Abstract

The invention belongs to the technical field of a servo driver, in particular to a high torque starting method for the servo driver. The aim of the invention is to solve the problem of serious influence on the control accuracy of a servo system due to executive mechanism vibration caused by disturbed torque in the starting process of an alternating current (AC) permanent-magnet servo motor. The technical scheme provided by the invention comprises the following steps of: firstly, establishing a simulation model of the servo driver in MATLAB according to the hardware circuit of the servo driver; secondly, acquiring a proportion integration differentiation (PID) value according to a multi-model control method based on pattern recognition; and finally, acquiring a control signal by a space vector pulse width modulation (SVPWM) method according to the acquired PID value to drive the servo motor and realize the startup of the servo driver. Based on a correction and control technology for current and position deviation in the starting process of the servo driver, the method is effective and rapid and can weaken the ripple wave torque generated by countering electromotive force of the motor and stator current harmonic, improve the low speed stability and control the accuracy.

Description

technical field [0001] The invention belongs to the technical field of servo drives, and in particular relates to a method for starting a servo drive with high torque. Background technique [0002] At present, the speed regulation function of servo motors is mainly realized through frequency conversion and variable voltage control technology, and sinusoidal pulse width modulation technology (SPWM) is an effective method to realize frequency conversion and variable voltage speed regulation control. 【1】 . The purpose of voltage space vector (SVPWM) control is to generate a circular magnetic field inside the servo motor, resulting in a constant electromagnetic torque. The variables of the motor, such as: voltage, current, electromotive force, magnetic flux, etc., are described by space vectors. By establishing a dynamic mathematical model of the motor, the real-time relationship between various physical quantities can be obtained, and realized on the directional coordinate sys...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the actuator vibrates due to the disturbance torque during the start-up process of the AC permanent magnet synchronous servo motor, which seriously affects the control accuracy of the servo system, and provides a control method for the high-torque start of the AC servo drive. The method Weaken the ripple torque generated by the back electromotive force of the motor and the harmonics of the stator current, and improve the low-speed stability and control accuracy

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