Electrification. Information age, in the performance, reliability and capacity, etc., puts forward the higher request on the motor. Ac variable frequency speed regulation system and frequency conversion motor. High power brushless dc motor. Brushless permanent magnet synchronous motor got great development.

At the same time, with the development of emerging industries, micromotor has become a bright spot in the development of motor industry, electrical appliances industry in China is the key point of the development of the (motor) products. Rare earth permanent magnet motor, the bearingless motor is the new trend of technology development.

Corresponding to this, the motor has a new development, the drag system and put forward higher requirements, such as the requirement to improve machining precision and working speed, for quick start. Brake and reverse, implement a wide range of speed control and automation of the whole production process, which requires a complete set of automatic control equipment of automation of electric drive system. And the high demand of drive system with the continuous development of automatic control theory, semiconductor devices and the application of power electronic technology and the development of numerical control technology and computer technology and using, is continuously improve and improve.

To sum up, electric drive technology development so far, it has many other drag the way the incomparable advantages. It started. Brake. Inversion and speed regulation control simple. Convenient. Rapid and high efficiency; The type of the motor, and has a variety of operating characteristics to meet the requirements of various types of production machinery; Detect the parameters of the whole system and signal transformation and transmission is convenient, easy to realize the optimal control. Therefore, the electric drive has become the foundation of the national economy of electrical automation.