Driving control and rotating angle measurement system used for stepping motor

Abstract

The invention provides a driving control and rotating angle measurement system used for a stepping motor. The measurement system measures the rotating angle by using an absolute coder based on stepping motor closed-loop control of an LMD18200 chip. The measurement system comprises an upper computer, a single-chip microcomputer controller, a stepping motor driving board, a stepping motor, a coupler, the absolute coder and a serial port protocol converter. The upper computer is connected with the single-chip microcomputer controller through a USB signal line. The single-chip microcomputer controller is connected with the stepping motor driving board through a control signal line and a feedback signal line. The stepping motor driving board is connected with the stepping motor through a driving current line. The stepping motor is connected with the absolute coder through the coupler. The absolute coder is connected with the serial port protocol converter through an RS485 serial port line. The serial port protocol converter is connected with the upper computer through an RS232 serial port line so as to form closed-loop control.

Description

technical field [0001] The invention relates to the technical field of electronic measurement, in particular to a drive control and rotation angle measurement system for a stepping motor. Background technique [0002] In the automatic control system, the stepper motor is a commonly used device, especially in the fields of machinery manufacturing and precision measurement. At present, the traditional stepper motor drive control uses an integrated stepper motor driver, mainly when the integrated stepper motor driver receives a pulse signal, the pulse signal drives the stepper motor to rotate a fixed angle in a set direction. Therefore, the number of pulse signals determines the angle of the corner, the frequency of the pulse signal determines the speed of the rotation speed of the corner, and the number and frequency of pulse signals are controlled by the software programming of the host computer. The control method of this stepper motor belongs to open-loop control, that is,...

AI Technical Summary

Problems solved by technology

This method has obvious disadvantages, that is, the angle information is relative to the zero-clearing position. When the encoder does not move or the power is cut off, the current position can only be remembered by the memory of the counting device. Once there is a disturbance, the motor will jump. or out of step, the memory position will be offset from the actual position, and this offset cannot be obtained, so that the test of the motor rotation angle will produce errors or even errors, and the actual rotation state of the motor cannot be accurately monitored

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