Motor closed loop control system based on precise signal feedback

Abstract

The invention discloses a motor closed-loop control system based on accurate signal feedback, which mainly consists of a position regulator, a current regulator connected with the position regulator, a drive circuit connected with the current regulator, and a motor connected with the drive circuit , a workbench connected to the motor, a grating ruler connected to the workbench, and an interference suppression circuit connected in series between the grating ruler and the position regulator. The invention detects the position pulse of the workbench through the grating ruler and feeds it back to the position regulator. The position regulator adjusts the output pulse number and frequency in real time according to the detected actual displacement state, so that the stepper motor is stable in the normal operation state, and Make the actual position consistent with the command position, so as to achieve precise positioning of the workbench. The invention is provided with a frequency correction circuit, which can perform frequency correction processing on the digital pulse signal fed back by the grating scale, avoiding the influence of the frequency distortion on the control of the motor by the position regulator, and improving the displacement accuracy of the workbench.

Description

technical field [0001] The invention relates to a motor control system, in particular to a motor closed-loop control system based on accurate signal feedback. Background technique [0002] At present, stepper motors are generally used for drive control when controlling the workbench. One of the main advantages of the stepper motor is that it can guarantee a certain control accuracy in the open-loop system, but the open-loop system also has some disadvantages: for example, it is impossible to know whether the stepper motor is in the constant speed stage of point movement and the speed-up stage of starting. Out of step, whether to overstep at the end of the step, and the speed change caused by the load change, especially when the load torque is large and there is an impact phenomenon, the out of step and lost step phenomenon is very prominent, thus affecting the work movement Table displacement accuracy. How to realize the accurate positioning of the workbench is a top prior...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the traditional motor open-loop control system cannot accurately control the motor, thereby affecting the positioning accuracy of the workbench, and to provide a motor closed-loop control system based on accurate signal feedback

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