In recent years, the application of brushless DC motor is gradually hot, especially on top of the model airplane, its power system mainly consists of rotor, stator and position sensor three parts, so how does it work? What are the classifications of position sensors?

DC brushless motors

Brushless DC motor position sensor working principle.

Mainly according to the rotor position change in a certain order to switch the stator winding current, that is, detect the position of the rotor pole relative to the stator winding, in the determined position to generate the position sensing signal, after the signal conversion circuit processing to control the power switch circuit, according to a certain logic relationship to switch the winding current.

Brushless DC motor position sensor classification.

Commonly, there are 3 types of magnetic, photoelectric and electromagnetic types.

1. Brushless DC motor with magnetic position sensor, its magnetic sensor components, such as Hall elements, magnetic diodes, magnetic transistors, etc., are installed on the stator assembly to detect the magnetic field changes caused by the rotation of the permanent magnet and rotor.

2. DC brushless motor with photoelectric position sensor, the photoelectric sensor is configured in a certain position on the stator assembly, the rotor is equipped with a shading plate, and the light source is a light-emitting diode or a small light bulb. When the rotor rotates, the photosensitive element on the stator will intermittently generate a pulse signal at a certain frequency due to the role of the light shield.

3. Brushless DC motors with electromagnetic position sensors are equipped with electromagnetic sensor components, such as coupling transformers and proximity switches, on the stator assembly. When the rotor position of the permanent magnet changes, the electromagnetic effect will cause the electromagnetic sensor to generate a high frequency modulated signal.

DC Motor

The above is the brushless DC motor position sensor working principle and role, more reading and more learning, so as to better grasp the brushless motor related knowledge.

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