What is Hall sensor?

Hall sensor is a kind of sensor based on the principle of Hall effect. Before introducing Hall sensor, let’s take a look at what is Hall effect. This kind of Hall effect means that if the metal sheet with current is placed in the magnetic field perpendicular to it, then there will be a potential difference between the two sides of the metal sheet. We call this electromotive force Hall electromotive force, which produces a potential difference This phenomenon is called Hall effect. Therefore, several conditions are needed to produce Hall: current, sheet metal and magnet. The hall sensor can be made by using the principle of Hall effect.

Ah173 Hall sensor

Hall sensor is generally divided into linear Hall sensor and switch type Hall sensor, which are widely used in Brushless DC motor, power measurement, valve position, current sensing, position detection, flow measurement, etc. the following introduces a switch type Hall sensor ah173, which is bipolar. It has two packages: SOT23 and to92, and it has three pins: VCC, GND, out, The output is high and low level pulse.


① 3V to 20V DC input voltage

② Maximum current 25mA

③ Working temperature: 40 ° C ~ + 125 ° C

Brushless DC motor is generally composed of power supply, controller, motor and position sensor. As shown in the figure below, it is usually controlled by digital signal, which has the characteristics of low energy consumption, fine speed and low noise. Some use Hall sensor as position sensor

As a three-phase brushless motor, it is based on the hall sensor in the motor for commutation to make the motor run normally. Generally, there are three Hall sensors. After the hall input signal is processed, the reliable commutation signal is obtained, and the signal is processed by the controller to execute the corresponding action.

Ah173 belongs to the lock type Hall element. It is sensitive to the S pole and N pole of the magnet. There will be a mark point on the surface of ah173. Attention should be paid to the direction during installation. If the magnetic induction intensity exceeds the action point BOP, the level will change from high to low. After the magnetic field is cancelled, the output state will remain unchanged and enter the latch state. If a reverse magnetic induction is added and the BRP intensity is reached, the level will change from low to high.

Editor in charge: CC

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