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Hall proximity switch is a common electronic switch that detects magnetic field signals through Hall elements to achieve object detection and control. It is mainly composed of Hall elements and signal processing circuits. It is widely used in the industrial field and has the advantages of high precision and low failure rate. So, how does it work?
First, we need to understand the basic structure of the Hall element. The Hall element is a semiconductor device, which is mainly composed of a piece of semiconductor material with metal terminals stuck on it, in which an electric field in a certain direction is embedded. When a large number of free carriers conduct electricity in it, it will generate a Lorentz force perpendicular to the electric field, thus forming a voltage in a certain direction. When a magnetic field passes through the Hall element, it can deflect the carriers, thereby changing the Lorentz force, its direction and magnitude, causing the voltage on the Hall element to change.
In the work of the Hall proximity switch, it uses the Hall element to detect changes in the magnetic field when an object approaches, and realizes the closing and opening of the switch. Normally, the circuit of a Hall proximity switch includes a Hall element, an amplifier circuit, an operating circuit and an output circuit. The Hall element is used to detect magnetic field signals, the amplifier circuit is used to amplify the detected signal, and the operating circuit is used to control the switch. Action, output circuit is used to transmit signals to other electrical equipment.
Specifically, when an object approaches the Hall proximity switch, the magnetic field it generates will change the voltage on the Hall element. The amplification circuit amplifies the detected signal and transmits it to the operating circuit, thereby controlling the action of the switch. The output circuit will generate corresponding signals and transmit them to other electrical equipment for control.
In short, the working principle of the Hall proximity switch is to use the Hall element to detect changes in the magnetic field of the object, thereby controlling the action of the switch and realizing the detection and control of the object. It has the advantages of high precision and high reliability, and has been widely used in fields such as automated production and robot control.
