Encoder limiting method

Abstract

An encoder limiting method is used to control rotation of an output shaft of a door machine. The door machine at least comprises a motor driving the output shaft. The method comprises the following steps that a magnet is provided and the magnet is fixed to the output shaft; an induction chip is provided and is installed so as to directly face the magnet; during door open and door close processes of the door machine, the magnet follows the output shaft to rotate; when the magnet rotates, the induction chip induces a magnetic field angle change of the magnet and generates an angle signal; the induction chip codes the angle signal into a digital signal; control equipment is provided, and the control equipment determines a rotation angle of the output shaft according to the digital signal and then emits a control signal to the motor so as to realize limiting to the output shaft. By using the encoder limiting method provided in the invention, limiting precision is high, there is no limiting blind area, a door machine operation state during a whole course is monitored, and the magnet and the induction chip have no physical contact so that durable performance is achieved.

Description

technical field [0001] The invention relates to the technical field of gate control, in particular to an encoder limit method. Background technique [0002] Gate control products are channel entrance and exit management equipment used to restrict pedestrians or motor vehicles on the road, and are widely used in residential areas, schools, hospitals, entrances of enterprises and institutions, parking lots and other places. [0003] At present, there are two kinds of limit methods for door control products: mechanical limit method and electronic limit method. Among them, the mechanical limit method is the traditional limit method, which has the disadvantages of complicated equipment and limited mechanical life. There are two types of electronic limit methods: the reed switch limit method and the potentiometer limit method. Among them, the reed switch limit method is not accurate, and the door operator is easy to hit the limit; the potentiometer limit method is accurate, But t...

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Problems solved by technology

[0003] At present, there are two kinds of limit methods for door control products: mechanical limit method and electronic limit method. Among them, the mechanical limit method is the traditional limit method, which has the disadvantages of complex equipment and limited mechanical life.

There are two kinds of electronic limit methods: the reed switch limit method and the potentiometer limit method. Among them, the reed switch limit method is not accurate, and the door operator is easy to hit the limit; the potentiometer limit method is accurate, But there is a dead point, which will cause a limit blind area

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