Over-torque protection control device and method for three-phase electric executor

Abstract

The invention relates to an over-torque protection control device and an over-torque protection control method for a three-phase electric executor. The over-torque protection control device comprises an analog / digital (A / D) acquirer, a current signal acquisition circuit, a voltage signal acquisition circuit and a central control circuit, wherein the central control circuit mainly comprises a zero passage comparison circuit A, a zero passage comparison circuit B, a singlechip calculation circuit and a rheostat for adjusting the mechanical efficiency; and over-torque signal data of the electric executor matched with the over-torque protection device are input into a singlechip program of the central control circuit and serve as standard signal data for comparing an actually acquired over-torque signal. By adopting a pure math induction calculation mode, pressure in an inner space of a box body of the electric executor is reduced, and over-torque protection precision control is reinforced; the flexibility of adjustable control precision is improved; the problem that the control precision is reduced because of the reduction of the mechanical efficiency caused by a reason that the electric executer is used for a long time is effectively solved; and the durability of the electric executor is improved.

Description

technical field [0001] The invention relates to electric actuators, in particular to a three-phase electric actuator over-torque protection control device and method. The over-torque protection control device fully utilizes the computing power of a single-chip microcomputer, and through A / D collectors, current transformers, and voltage transformers The combined use of the traditional sensor instead of the detection means, away from the original motor and mechanical torque formula, the use of pure mathematics [0002] It can achieve high control precision and flexible over-torque protection control effect through multi-directional adjustable methods. Background technique [0003] The over-torque protection is an important control link of the electric actuator. Its control accuracy will directly determine whether the actuator can protect itself and the connected valve. Once the over-torque protection does not work as expected, it is likely have a significant adverse effec...

AI Technical Summary

Problems solved by technology

The control accuracy of the earliest mechanical over-torque protection has obviously failed to meet the actual needs, and the use of sensors to implement high-precision measurement and control puts considerable pressure on the internal structure of the electric actuator, and its durability and with the development of the electric actuator The decline in control accuracy cannot be guaranteed

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