Zero position-searching method for limited angle servo turntable

Abstract

The invention discloses a zero position-searching method for a limited angle servo turntable and belongs to the technical field of servo control. In the method, an optoelectronic switch is installed between a mechanical zero position and a positive limit of the servo turntable; the position of the optoelectronic switch and the positive mechanical limit are respectively taken as a first reference point and an auxiliary reference point of the method; a motor rotates positively when the servo turntable turns on; and the motor can be controlled to reversely rotate at a corresponding known angle when a transistor-transistor logic (TTL) level signal controlled by the optoelectronic switch is searched or a current value of the motor is monitored to reach a set threshold value, and then the accurate mechanical zero position can be found out. According to the method, the zero position searching is performed by preferably using the first reference point and is carried out through the auxiliary reference point when the optoelectronic switch is out of work. Moreover, the zero position-searching reliability and the working stability of the servo turntable are improved by the method on the basis of not increasing any cost.

Description

technical field [0001] The invention belongs to the technical field of servo control, and mainly relates to a method for finding a mechanical zero position of a limited-rotation-angle servo turntable, in particular to a method for finding a mechanical zero-position of a limited-rotation-angle servo turntable with an incremental encoder when starting up. Background technique [0002] Incremental encoders for limited angle servo turntables are generally installed on the motor shaft or load shaft. The controller of the servo turntable can judge the rotation direction of the motor according to the order of the two pulses output by the encoder, and determine the limited rotation according to the number of pulses. The angular position of the corner servo turntable. This method requires first to determine the initial position of the motor rotor. Since the incremental encoder has no position memory function after the power is turned off, the initial position of the motor rotor is un...

AI Technical Summary

Problems solved by technology

Although this method is simple, once the photoelectric switch is damaged, the servo turntable will not be able to find the mechanical zero position and cannot start up and work normally.

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