Generally, three-phase or single-phase AC asynchronous and synchronous motors are mostly used in industries where speed regulation is not required. With the development of power electronics technology, more and more motors are being brushless and straight in order to reduce volume, save materials, improve efficiency and reduce loss under the condition of power less than 10 kW and continuous operation. These applications are: automatic doors, elevators, pumps, fans and so on. In the case of high power, brushless motors are seldom used because of the large primary cost and investment, in addition to permanent magnet motors and other equipment need to be added.

Speed needs to be set and adjusted arbitrarily, but the speed control system with low control precision is required. This kind of system is divided into two kinds: one is open-loop speed control system, the other is closed-loop speed control system (at this time the speed feedback device mostly uses low-resolution pulse encoder or AC, DC speed measurement, etc.). There are mainly three kinds of motors commonly used: DC brush motor, asynchronous motor and DC brushless motor. It is widely used in packaging machinery, food machinery, printing machinery, material conveying machinery, textile machinery and traffic vehicles.

DC motor is widely used in the application field of speed control system at the beginning. With the development of AC speed control technology, especially power electronics technology and controller, AC frequency conversion technology has been widely used. Frequency converter and AC motor penetrate into the vast majority of the original application fields of DC speed control system. In recent years, due to the advantages of small size, light weight and high efficiency of energy-saving brushless DC motor, medium and small power AC frequency conversion system is gradually replaced by brushless DC speed control system, especially in textile machinery, printing machinery and other original frequency conversion system applications more fields. In some applications directly supplied by batteries, DC brushless motors are more widely used.

Servo motors have always played an important role in the high-precision control of industrial automation. Different applications require different performance of servo motors. In practical applications, servo motors have different control forms: torque control/current control, speed control, position control. Control. Because of its good control performance, the brushless DC motor gradually replaces the DC motor and the stepper motor in the high-speed and high-precision positioning system, and becomes one of the motors selected by the modern servo system. At present, the brushless DC motor servo system is widely used in the fields of scanner, camera, CD drive, medical diagnostic CT, computer hard disk drive and NC lathe drive.

Household appliances such as automatic washing machine, CD player, etc., military applications such as submarines, warships, and large-scale synchronous motor start-up.