Why the hall sensor use the thin block magnet

A large number of magnets are used in the Hall sensor, and the Hall effect is used. The so-called Hall effect refers to a physical phenomenon in which a lateral potential difference is generated when a magnetic field acts on current-carrying metal conductors and carriers in semiconductors. When the current passes through the Hall element, if a magnetic field is applied in the direction perpendicular to the current, there will be a lateral potential difference (called Hall voltage) on both sides of the Hall element. Due to the change of the magnetic field, the Hall element sends out a pulse signal It is transmitted to the controller for processing, so as to realize the functions of sensors or switches such as speed measurement and position measurement. Therefore, there needs to be a change in the magnetic field to have the corresponding Hall pulse signal output. You use a circular magnet to fix the axis of the dot machine. If the magnetic field is the same all around, then there will be no output change, so you A small-volume magnet with high magnetic properties (such as a rectangular parallelepiped or flat body) should be selected and fixed on the motor with n-pole or s-pole perpendicular to the motor shaft. Since you are using a unipolar Hall, then you use One pole of the magnet faces the front induction area of ​​the Hall. When the magnet on the motor shaft turns to the position where the Hall is placed, it will be subject to changes in the magnetic field and cut the lines of magnetic force, and the Hall will output a pulse signal. This is how the Hall sensor works

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