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What are the working principles of the Hall switch, linear switch, and inductive switch?

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What are the working principles of the Hall switch, linear switch, and inductive switch?

  • Categories:home-industry
  • Author:
  • Origin:
  • Time of issue:2022-11-23 16:03
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(Summary description)

What are the working principles of the Hall switch, linear switch, and inductive switch?

(Summary description)

  • Categories:home-industry
  • Author:
  • Origin:
  • Time of issue:2022-11-23 16:03
  • Views:
Information

1. Hall proximity switch working principle

When a sheet of metal or semiconductor carrying a current is placed vertically in a magnetic field, a potential difference will be generated across the sheet, a phenomenon known as the Hall Effect. The potential difference at both ends is called the Hall potential U, and its expression is: U=K·I·B/d

Where K is the Hall coefficient, I is the current passing through the sheet, B is the magnetic induction intensity of the applied magnetic field (Lorrentz force), and d is the thickness of the sheet. It can be seen that the sensitivity of the Hall effect is directly proportional to the magnetic induction intensity of the external magnetic field.

Hall switch belongs to this kind of active magnetoelectric conversion device, it is based on the principle of the Hall effect, and it is made by using integrated packaging and assembly process. It can conveniently convert magnetic input signals into electrical signals in practical applications, and at the same time meet the requirements of easy operation and reliability for practical applications in industrial applications.

The input terminal of the Hall switch is characterized by the magnetic induction intensity B. When the B value reaches a certain level (such as B1), the trigger inside the Hall switch is reversed, and the output level state of the Hall switch is also reversed. The output terminal generally adopts transistor output and is similar to other sensors, including NPN, PNP, normally open type, normally closed type, latch type (bipolar), and dual signal output.

The Hall switch has the characteristics of non-contact, low power consumption, long service life, and high response frequency. The interior is sealed and integrated with epoxy resin, so it can work reliably in various harsh environments. Hall switches can be applied to a proximity sensor, pressure sensor, odometer, etc., as a new type of electrical accessory.

 

 

2. Working principle of inductive proximity switch:

The inductive proximity switch is composed of three parts: an oscillator, a switching circuit, and amplifying output circuit. The oscillator generates an alternating magnetic field. When the metal target approaches this magnetic field and reaches the sensing distance, an eddy current is generated in the metal target, which causes the oscillation to attenuate and even stop the vibration. Oscillator oscillation and vibration stop changes are processed by the post-stage amplifier circuit and converted into switching signals, which trigger the drive control device, to achieve the purpose of non-contact detection.

 

 

3. Working principle of linear proximity sensor:

The linear proximity sensor is a linear device that belongs to metal induction. When the power is turned on, an alternating magnetic field will be generated on the sensing surface of the sensor. When a metal object approaches the sensing surface, an eddy current is generated in the metal to absorb the energy of the oscillator, so that the output amplitude of the oscillator is linearly attenuated, and then the purpose of non-contact detection of the object is achieved according to the change of the attenuation.

The proximity sensor has no sliding contacts, is not affected by dust and other non-metallic factors when working, has low power consumption and long life, and can be used in various harsh conditions. Linear sensors are mainly used in the intelligent control of analog quantities in automated equipment production lines.

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