hall sensor It is a sensor manufactured based on the principle of Hall effect. Before introducing Hall sensing, let's first take a look at what Hall effect is. This Hall effect refers to placing a metal sheet with current in a magnetic field perpendicular to it, which will generate a potential difference between the two sides of the metal sheet. We call this electromotive force Hall electromotive force, and this phenomenon is called Hall effect. Therefore, the generation of Hall requires several conditions: current, metal foil, and magnet. The principle of Hall effect can be used to createhall sensor .

hall sensor There are generally two types of Hall sensors: linear Hall sensors and switch type Hall sensors, which are widely used in DC brushless motors, power measurement, valve position, current sensing, position detection, flow measurement, etc. The following introduces a switch type Hall sensor AH173, which is bipolar and has two packages: SOT23 and TO92. It has three pins: VCC, GND, OUT, and outputs high and low level pulses.

characteristic:

① 3V to 20V DC input voltage

② Maximum current 25mA

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

Brushless DC motors are generally composed of power supply, controller, motor, and position sensor, as shown in the figure below. They are usually controlled by digital signals and have the characteristics of low energy consumption, fine speed, and low noise. Some usehall sensor As a position sensor

As a three-phase brushless motor, it operates normally by commutation based on the Hall sensor in the motor. Generally, there are three of themhall sensor After the Hall input signal is processed, a reliable commutation signal is obtained, and the signal is processed by the controller to perform the corresponding action.

Locking type Hall elements are sensitive to both the S and N poles of magnets, and there will be a marking point on their surface. When installing, attention should be paid to the direction. If the magnetic induction intensity exceeds the action point Bop, the level changes from high to low. After the magnetic field is cancelled, the output state remains unchanged and enters the latch state. If a reverse magnetic induction is added and the Brp intensity is reached, the level changes from low to high.