Because the brushless DC motor not only has a series of advantages such as simple structure, reliable operation and convenient maintenance of the AC motor, but also has the characteristics of high operating efficiency, no excitation loss and good speed regulation performance of the DC motor, so it is widely used in various fields of today‘s national economy. , such as medical equipment, instrumentation, chemical industry, textile and household appliances, etc. are increasingly popular.

The applications of brushless DC motors are mainly divided into the following categories:

1. Fixed speed drive machinery

In general industrial occasions where speed regulation is not required, most of the three-phase or single-phase AC asynchronous and synchronous motors are used. With the advancement of power electronics technology, in order to reduce the volume and save energy when the power is not more than 10kw and in the case of continuous operation Materials, improve efficiency and reduce losses, more and more motors are being replaced by brushless DC motors, such applications are: automatic doors, elevators, pumps, fans, etc. In the case of high power, due to the large primary cost and investment, in addition to the permanent magnet motor, it is necessary to increase the driver and other equipment, so the brushless motor is rarely used at present.

2. Adjustable speed drive machinery

The speed needs to be set and adjusted arbitrarily, but the speed control system does not require high control accuracy. This type of system is divided into two types: one is an open-loop speed control system, and the other is a closed-loop speed control system (the speed feedback devices at this time mostly use low-resolution pulse encoders or AC and DC speed measurement, etc.). There are three main types of motors commonly used: DC brush motors, asynchronous motors and DC brushless motors. This has numerous applications in packaging machinery, food machinery, printing machinery, material handling machinery, textile machinery and transportation vehicles.

At the beginning of the application field of variable speed system, DC motors were mostly used. With the development of AC speed regulation technology, especially power electronics technology and controllers, AC variable frequency technology has been widely used, and frequency converters and AC motors have penetrated into The vast majority of the original DC speed control system applications. In recent years, due to the increasingly prominent advantages of brushless DC motors such as small size, light weight, high efficiency and energy saving, medium and small power AC frequency conversion systems are gradually being replaced by brushless DC speed control systems, especially in textile machinery, printing machinery and other original equipment. Frequency conversion system is used in many fields. In some applications that are directly powered by batteries, brushless DC motors are now more commonly used.

3. Precise control

Servo motors have always played a very important role in high-precision control in the field of industrial automation. Different applications have different control performance requirements for servo motors. In practical applications, various control forms of servo motors are used. : Torque control/current control, speed control, position control. Due to its good control performance, brushless DC motors gradually replace DC motors and stepper motors in high-speed and high-precision positioning systems, and become one of the motors selected by modern servo systems. At present, scanners, cameras, CD drive drives, medical diagnostic CT, computer hard disk drives and CNC lathe drives are widely used brushless DC motor servo systems for precision control.

4. Other applications

Household appliances such as automatic washing machines, CD players, etc.; military applications such as submarines, warships; and the start of large synchronous motors.

The above are the 4 categories of brushless DC motors, I hope they can help you.