The brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. The stator winding of the motor is mostly made into a three-phase symmetrical star connection, and it runs in a self-controlled manner, without adding a starting winding to the rotor, and will not produce oscillation and out-of-step when the load is abruptly changed. Magnetized neodymium iron boron or samarium cobalt permanent magnets are attached to the rotor of the motor. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver is composed of power electronic devices and integrated circuits, etc. Its main function is to accept the start, stop, and brake signals of the motor, control and adjust the speed, provide protection and display, etc.

The brushless DC motor has the advantages of small size, light weight, large output, low noise, low vibration, smooth operation, good overall stability, high reliability, strong adaptability, long service life, simple maintenance and maintenance, and no sparks during operation. With explosion-proof performance.

Brushless DC motors are widely used, mainly in automobiles, tools, industrial control, automation, aerospace and other equipment. In general, brushless DC motors can be divided into the following three main uses:

Continuous load applications: mainly in areas that require a certain speed but do not require high speed accuracy, such as applications such as fans, water pumps, and hair dryers. These applications have low cost and are mostly open-loop control.

Variable load application: It is mainly an application where the speed needs to be changed within a certain range, and there is a higher demand for the motor speed characteristics and dynamic response time characteristics. Such as household appliances, dryers and compressors, oil pump control, electrical controller, engine control, etc. in the automotive industry, the system cost of such applications is relatively higher.

Positioning application: It is basically suitable for industrial control and automatic control. In such applications, energy transmission will be completed, and there are high requirements for the dynamic response of speed, torque and controller. At the same time, the speed measurement may be configured according to the actual function. Optoelectronics and some synchronizing equipment, process control, mechanical control and transportation control are all such applications.

The practical new brushless motor is closely related to the development of electronic technology, microelectronics technology, digital technology, automatic control technology and material science. It is not limited to the field of AC and DC, but also involves fields such as electric power, power generation, energy conversion and signal sensing. The variety and application of new brushless motors in the motor field are wide, but the brushless motors with excellent performance are not widely used due to the limitation of market prices, and are still in a state of continuous development.