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The Brushless Direct Current Motor (BLDCM) is a rotating motor driven by square wave current, capable of converting DC electrical energy into mechanical energy or vice versa, without the presence of carbon brushes.

Its transmission part is located inside the motor, with the housing remaining static while the inner rotor rotates. Typically, the part embedded with magnetic steel (i.e., the rotor) rotates, while the coil part (i.e., the stator) remains stationary. This structure allows the winding to be placed directly on the stator, eliminating the need for slip ring devices. Moreover, the rotor's excellent heat dissipation conditions contribute to reducing the motor's size.

The transmission part of this motor is located outside, with its interior remaining static while the outer housing rotates. The stator is fixed in the middle of the axis and remains stationary, and the rotor rotates around the periphery of the stator, forming a radial air gap magnetic flux structure. This structure allows the outer rotor to be constructed as a fully enclosed unit, enabling it to start quickly and operate with low power consumption, high rotational speed, and high efficiency. However, it does have drawbacks such as poor sealing performance, large rotor inertia, high noise levels, and high dynamic balance requirements.

The Hall sensor in a brushless DC motor utilizes the Hall effect principle to output current by measuring the commutation position of the magnet, thereby assisting the controller in identifying the rotor position information. This enables the motor to achieve more precise control. The Hall sensor is installed inside the motor, where it detects the rotor's position in real-time and feeds back the position information to the controller. Based on this position information, the controller manages the energization sequence and current level of the motor's windings, facilitating the continuous rotation of the motor.