Electric actuating mechanism control device of novel brushless direct current motor and method

Abstract

The invention belongs to the fields of industry, agriculture, household appliances and the like and provides a method that a brushless direct current motor is adopted for replacing a servo motor in a traditional electric actuating mechanism, thereby solving the problem that inaccurate positioning exists in the traditional electric actuating mechanism or failure of an electromagnetic contracting brake causes inertial moving, driving sway or starting failure. According to a control device designed through the method, a single chip microcomputer is adopted on the aspect of hardware, the motor is controlled to fast rotate forwards or backwards, therefore, a valve is controlled to reach appointed opening degree, and the control accuracy can reach + / -1%; besides, an LCD is used for displaying the opening degree of the valve and field parameters in real time and on site; meanwhile, a controller sends the actual opening degree position and system field parameters to a control center through a bus wireless network and receives a control command of an upper computer; and moreover, a plurality of control devices can be suspended on a field bus, a field bus control network with the upper computer as a host is formed, and setting parameters such as the valve sensitivity, zero point and travel can be preset through a human-computer interface.

Description

technical field [0001] The invention belongs to the fields of industry, agriculture, household appliances and the like. Background technique [0002] The electric actuator is the executive unit in the combined instrument of the electric unit. It is widely used in metallurgy, electric power, chemical industry and other departments. It is a product with a large number and wide application. It is composed of two completely independent parts on the circuit, the control device and the actuator. It receives the electric control signal from the regulator and converts it linearly into a mechanical angle or linear displacement, which is used to control the adjustment of the damper, baffle, valve, etc. mechanism for automatic control. Reduce the physical labor intensity of operating personnel. The electric actuator is not only a component of an electric valve, but also a very important basic device in an industrial control automation system. The traditional electric actuator has un...

AI Technical Summary

Problems solved by technology

The traditional electric actuator has unsatisfactory dynamic performance and inaccurate positioning. This invention proposes a method—using a brushless DC motor to replace the servo motor in the traditional electric actuator, which solves the inaccurate positioning of the traditional electric actuator. Accurate or the problem of coasting, swinging head or not opening due to the failure of the electromagnetic brake; the control device designed by this method can make the electric actuator simple in structure and accurate in position, which solves the problem of traditional electric actuator hardware. The problem of complex structure and inaccurate positioning also reduces the cost of the system

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