Anyone who has used brushless motors knows that the biggest contribution to support brushless motors that can eliminate carbon brushes is the sensor, and the most used sensor on brushless motors is the Hall sensor. Why does the Hall sensor enable the brushless motor to cancel the physical carbon brush and bring so many benefits to the brushless motor?The brushless motor can be put into mass production and used in normal production and life. In fact, this is all due to the Hall sensor. What is a Hall sensor? Hall sensor is a kind of magnetic sensor. It can detect the magnetic field and its changes, and can be used in various situations related to the magnetic field.The Hall sensor is based on the Hall effect and is an integrated sensor composed of a Hall element and its auxiliary circuits. The principle of the Hall sensor has a Hall semiconductor in the magnetic field, and a constant current passes through the slice from the horizontal direction. Under the action of the Lorentz force, the electron flow shifts to one side when passing through the Hall semiconductor, causing the sheet to generate a potential difference in the vertical direction, which is the so-called Hall voltage. The Hall voltage changes with the change of the magnetic field intensity. The stronger the magnetic field, the higher the voltage, the weaker the magnetic field, and the lower the voltage. The Hall voltage value is very small, usually only a few millivolts, but it is amplified by the amplifier in the integrated circuit. The voltage can be amplified enough to output a stronger signal.If the Hall IC is used for sensing, it is necessary to use a mechanical method to change the magnetic field strength. A rotating rotor shaft is used as a switch to control the magnetic flux. When the Brushless DC Gear Motors Manufacturers is in the air gap between the magnet and the Hall IC, the magnetic field deviates from the integrated chip and the Hall voltage disappears. In this way, by collecting changes in the output voltage of the Hall IC, a certain position of the rotor shaft can be indicated.The brushless motor uses the principle of the Hall sensor to know the position of the rotor through the Hall sensor, and then controls the current through the signal, so that the motor shaft continuously changes the magnetic field and interacts with the magnetic field of the permanent magnet to achieve the purpose of turning.