Control system of electric execution mechanism

Abstract

The invention relates to a control system of an electric execution mechanism. The control system comprises a main control and remote control board, an analog control board, a valve position detection board, a torque detection board and a bus control board, and is characterized in that the main control and remote control board processes valve position information, torque information, a remote switching value, an analog value and a bus instruction signal inside and outside the electric execution mechanism; a circuit of the valve position detection board is a hall increment encoder or a magneto-electric absolute encoder; and the torque detection board is a double-channel electronic circuit detection board or a double-channel constant-elasticity differential stress technology detection board. A double-channel constant-elasticity differential stress technology is used for measuring torque of the electric execution mechanism without being influenced by voltage fluctuation and frequency fluctuation of a power grid; and by the technical scheme, the control system, which does not produce drift and does not damage a valve rod, of the electric execution mechanism is provided.

Description

technical field [0001] The invention relates to a motor actuator, and further relates to a control system of an intelligent motor actuator. Background technique [0002] The existing detection devices for electric actuators all have their own shortcomings when measuring torque. Although according to the motor torque formula T=K*I 2 *Φ 1 *cosθ 2 The measurement of the torque is realized by using the time division multiplier, but according to another torque formula T=9550*U*I*cosθ / n, the torque is also related to the speed n. In addition, such a processing method has disadvantages, for example, the torque measurement is also affected by grid voltage fluctuations. [0003] The detection of the valve position in the prior art mainly has the following disadvantages: (1) the mode of using a planetary gear plus a potentiometer is easy to cause a temperature drift, causing a change in the valve position stroke, thereby causing the valve stem to break or deform; (2) ) Hall incre...

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Problems solved by technology

[0003] The detection of the valve position in the prior art mainly has the following disadvantages: (1) the mode of using a planetary gear plus a potentiometer is easy to cause a temperature drift, causing a change in the valve position stroke, thereby causing the valve stem to break or deform; (2) ) Hall incremental encoder, but often within a few seconds of starting, the rotation direction of the output shaft is opposite to the direction of the switch command, causing the valve stem to be bent

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