Brushless DC motors share the same working principle and application characteristics as general DC motors, but their composition is different. In addition to the motor itself, the former also has an additional commutation circuit, which is closely integrated with the motor itself. Many small power motors are integrated with commutation circuits, and from the appearance, DC brushless motors are exactly the same as DC motors. The motor of a DC brushless motor itself is a part of electromechanical energy conversion. In addition to the motor armature and permanent magnet excitation, the DC brushless motor also has sensors. The motor itself is the core of a DC brushless motor, which is not only related to performance indicators, noise and vibration, reliability, and service life, but also involves manufacturing costs and product costs. Due to the use of permanent magnet magnetic fields, DC brushless motors are able to break away from the traditional design and structure of ordinary DC motors, meet the requirements of various application markets, and develop towards copper saving, material saving, and simple manufacturing. The development of permanent magnet magnetic fields is closely related to the application of permanent magnet materials. The application of third-generation permanent magnet materials has led to the advancement of DC brushless motors towards high efficiency, miniaturization, and energy conservation.

In order to achieve electronic commutation, a DC brushless motor must have a position signal to control the circuit. In the early days, position signals were obtained using electromechanical position sensors. Now, electronic position sensors or their DC brushless motor methods have gradually been used to obtain position signals. The simplest method is to use the electromotive force signal of the armature winding as the position signal. To achieve speed control of a DC brushless motor, a speed signal is necessary. The simplest method of obtaining speed signals by obtaining similar position signals is the combination of a frequency measuring tachometer generator and electronic circuits. The commutation circuit of a DC brushless motor consists of two parts: drive and control, which are not easily separated, especially in low-power circuits where the two are often integrated into a single dedicated integrated circuit. In high-power motors, the drive circuit and control circuit of DC brushless motors can be integrated separately. The driving circuit outputs electrical power, drives the armature winding of the motor, and is controlled by the control circuit. At present, the DC brushless motor drive circuit has transitioned from a linear amplification state to a pulse width modulated switching state, and the corresponding circuit composition has also shifted from discrete transistor circuits to modular integrated circuits. Modular integrated circuits are composed of power bipolar transistors, power field-effect transistors, and isolated gate field-effect bipolar transistors. Although isolation gate field-effect bipolar transistors are more expensive, from the perspective of reliability, safety, and performance, choosing a DC brushless motor is still more appropriate.