An isolated electric push rod control method and device with in-position feedback function

Abstract

The invention provides an isolation type electric push rod control method and device with an in-place feedback function. The isolation type electric push rod control device is composed of a control module, an isolation module, a driving module and an electric push rod, wherein the control module is composed of a control unit, a power supply isolation unit and an input / output unit. According to the isolation type electric push rod control method and device, a micro-switch is used as a route in-place signal source and an electric push rod stopping signal source, so that an in-place automatic stopping function and an in-place signal feedback function of the electric push rod are realized, and function requirements that the push rod is automatically stopped after being moved in place can be met. By adopting a feedback signal isolation method, the reliability of a control system is improved; meanwhile, impact influences caused by the moment of starting and stopping the electric push rod can be eliminated, and an incorrect triggering problem of an in-place signal does not occur; and the judgment is accurate and the service life of the device is prolonged.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to an isolated electric push rod control method and device with in-position feedback function. Background technique [0002] Electric push rod, also known as push rod motor, electric cylinder and linear actuator, is an electric drive device that converts the rotational motion of the motor into the linear reciprocating motion of the push rod. It can be used in various simple or complex processes as Perform mechanical use to achieve remote control, centralized control, or automatic control. [0003] At present, most commonly used electric push rods are equipped with micro switches, which are connected in series to the motor power supply circuit. When the screw nut on the electric push rod moves to the required position, it will press the micro switch and cut off the electric push rod. The working power of the rod, the electric push rod stops moving. [0004] Using ...

AI Technical Summary

Problems solved by technology

[0004] Using this push rod control method can realize the automatic stop of the electric push rod after the movement is in place, but in the automatic control, the upper computer cannot obtain the exact information of whether it is in place

Misoperation or miscontrol after reaching the limit stroke may cause damage to the motor

[0005] In order to obtain the in-position information of the electric push rod, the common practice is to add Hall sensors or potentiometers to the push rod, which not only increases the cost of the control system, but also may cause the push rod to be large in size and complex in structure, which is not conducive to installation and use

[0006] At the same time, the method of directly connecting the micro switch to the working power supply of the motor will reduce the reliability of the motor control point system; the signals such as in-position sensors and potentiometers are fed back to the control unit without isolation, which cannot inhibit the motor from starting or stopping Signal interference introduced during

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