What is a brushless DC motor?
A brushless DC motor using a magnetically sensitive position sensor has a magneto-sensitive sensor element mounted on a stator assembly for detecting a change in the magnetic field generated when the permanent magnet and the rotor rotate. A brushless DC motor adopting a photoelectric position sensor has a photoelectric sensor arranged on a stator assembly at a certain position. A shading plate is mounted on the rotor, and the light source is a light emitting diode or a small light bulb. When the rotor rotates, due to the action of the shading plate, the photosensitive components on the stator will generate pulse signals intermittently at a certain frequency. A brushless DC motor adopting an electromagnetic position sensor is equipped with an electromagnetic sensor component on the stator assembly. When the position of the permanent magnet rotor changes, the electromagnetic effect will cause the electromagnetic sensor to generate a high-frequency modulation signal.
The general brushless DC motor essentially belongs to a servo motor, which is composed of a synchronous motor and a driver and is a variable frequency speed control motor. Variable-voltage speed-regulated brushless DC motors are truly brushless DC motors.