The fast current loop bandwidth expansion method for high response AC permanent magnet servo system
As for the existing method of current sampling and pulse width modulation(PWM)duty cycle update in AC permanent magnet servo control systems,the delay time is long,which will affect the current loop bandwidth and dynamic characteristics of the motor to a certain extent.In response to this issue,a mathematical model of the current loop closed-loop system was established,and the internal delay of the current loop and the factors affecting the current loop bandwidth were analyzed.Based on this,a current loop bandwidth expansion method was proposed by improving the current sampling and shortening the PWM update time.This method reduces the delay between current sampling and PWM duty cycle update by advancing the timing of PWM duty cycle update,and reduces signal transmission delay,thereby expanding the closed-loop bandwidth of the current loop system and improving the system response speed.The simulation and experimental results show that compared with existing current sampling methods,the current loop of the AC permanent magnet servo control system using the new method has a wider bandwidth and higher dynamic response ability,thereby improving the dynamic response ability and steady-state accuracy of the AC servo system.This method can provide reference for the application of AC servo systems in fields such as robots and high-end intelligent equipment that require high response speed and positioning accuracy.
AC permanent magnet servo controlfast current loopcurrent samplingduty cycle updatescurrent loop bandwidth expansion
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维普
