An encoder integrating motor rotor position detection and valve position stroke detection

Abstract

The invention discloses a position detection and valve position and stroke detection integral coder for a motor rotator, which comprises a stroke input shaft, a stoke input gear, a base, a control circuit and the like. By arranging a coaxial device at the coaxial tail end of a motor, the first layer is improved in speed via a 1:5 speed-up fluted disc, and continuously reading binary 8-bit absolute encoder value corresponding to a code disc is taken as motor rotator position detection; firstly, the second layer, the third layer and the fourth layer are lowered in the rotational speed via a speed-down fluted disc 40:1 in the total ratio, then binary 16-bit absolute codes corresponding to the rotation positions of code discs in the first layer, the third layer and the fourth layer are continuously read via a photosensor access code circuit and are transmitted to a level conversion circuit, and finally, a rotator position signal and a valve opening signal are shaped and transmitted to a corresponding processor for logical judgment, so that high-precision motor position detection and motor valve position of one coder are synchronously achieved.

Description

technical field [0001] The invention relates to motor rotor position detection and valve stroke detection of a valve electric actuator system, in particular to an encoder that integrates the position detection of a switched reluctance motor rotor and the stroke position detection of a valve position. Background technique [0002] The valve electric actuator based on the switched reluctance motor is a new type of valve electric actuator with strong functions and high reliability. It can meet the needs of high-end control requirements in nuclear power plants, thermal power plants, and petrochemical industries. The high-reliability switched reluctance motor controller is selected to effectively control the speed of the motor, and to realize accurate and reliable positioning of the valve stroke in process control, and to realize good protection of the valve and the actuator. Therefore, the position detection and valve stroke detection of the switched reluctance motor are importa...

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Problems solved by technology

[0004] The tooth plate of the above-mentioned existing switched reluctance motor position detection device is the same size as the motor rotor, which is not easy to be miniaturized, and the switched reluctance motor position detection and valve stroke detection mechanisms are separately arranged, which not only occupies the valve The space of the electric actuator is increased, and the failure rate of the detection device is increased, which reduces the accuracy and reliability of the detection

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