Differential Hall multi-turn-position absolute position sensor and detection method thereof

Abstract

The invention, which belongs to the technical field of stroke detection, provides a differential Hall multi-turn-position absolute position sensor and a detection method thereof. The differential Hallmulti-turn-position absolute position sensor comprises a first detection module and a controller. The first detection module includes a first rotation device, a first magnetic component, a first Hallangle sensor, and a controller. The first rotation device connected with an output shaft of an actuator rotates at a set first transmission ratio under driving of the output shaft. The first magneticcomponent is disposed on the first rotation device. The first Hall angle sensor corresponding to the first magnetic component acquires a first angle of rotation of the first rotation device in real time. The controller calculates a stroke of the actuator based on the first angle and the first transmission ratio. According to the invention, non-contact detection is performed based on the Hall principle; and all parts and a detection result are protected from being affected by vibration of a harsh environment of actuator mounting and the like, so that the service life of the sensor is prolongedeffectively and the measurement accuracy is improved. Meanwhile, the transmission signal of the Hall principle is a digital signal; the anti-interference ability is powerful; and the signal transmission is reliable.

Description

technical field [0001] The invention relates to the technical field of stroke detection, in particular to a differential Hall multi-turn position absolute position sensor and a detection method thereof. Background technique [0002] The actuator is an essential and important part of the automatic control system. Its function is to accept the control signal sent by the controller, change the size of the controlled medium, so as to maintain the controlled variable at the required value or within a certain range. [0003] In the industrial automation control, the actuator generally controls the flux of the medium in the pipeline by connecting the valve to achieve the purpose of process control. The opening of the valve is given by the stroke of the actuator or fed back to the control system through the actuator; the stroke feedback of the actuator directly affects the quality of the industrial production process. [0004] Existing actuators use potentiometers as stroke feedba...

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Problems solved by technology

[0005] The present invention aims at using the potentiometer as the stroke feedback of the actuator in the prior art. Since the potentiometer is an electronic component connected to an analog electrical signal and with mechanical movement, its service life and measurement accuracy will be reduced in the harsh environment where the actuator is installed. The problem that the transmission of the measurement signal and the measurement signal will be seriously affected, a differential Hall multi-turn position absolute position sensor and its detection method are provided

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