Compared with the traditional electric excitation motor, the permanent magnet motor has obvious advantages such as simple structure, reliable operation, small size, light weight, low loss, high power, flexible and diverse motor shapes and sizes. Compared with the permanent magnet motor produced with the traditional NdFeB magnet permanent magnet material, the new permanent magnet motor using the high-performance NdFeB magnet permanent magnet material is smaller in size, lower in loss, and significantly higher in power than the traditional permanent magnet motor.
It is worth noting that the current demand for high-performance NdFeB magnet permanent magnet materials for energy-saving and environmentally friendly air conditioners and hybrid cars is mainly satisfied by the acquisition of high-performance NdFeB magnet permanent magnet materials produced in Japan, and China has not been selected for the time being. High-performance NdFeB magnet permanent magnet material.
The use of permanent magnet motors is extremely widespread, in various fields of aviation, aerospace, national defense, equipment manufacturing, industrial and agricultural production, and daily life: its capacity ranges from large to small, and now it has reached megawatts, and its use is getting wider and wider; its status It is becoming more and more important, from military industry to civilian use, from special to general categories, not only in the micro and special motors, but also in the electric propulsion system, showing strong vitality.
Permanent magnet motors are further divided into ferrite excitation motors and permanent magnet motors. A motor is an electromagnetic device that converts mechanical energy and electrical energy into each other through a magnetic field. In order to establish the air-gap magnetic field necessary for electromechanical energy conversion in the motor, there are two ways: passing the current in the motor winding to generate, not only requires special windings and corresponding equipment, but also needs to continuously provide energy to maintain the current flow, generally. It is called an electric excitation motor, such as a general DC motor and a synchronous motor; there is a permanent magnet to generate a magnetic field, which can simplify the motor structure and save energy. This is a permanent magnet motor.
Permanent magnet motors are developing in the direction of high power (high speed, high torque), high functionality and miniaturization, and continue to expand new motor types and application areas. At present, the main downstream industries of high-performance NdFeB magnet permanent magnet materials in China are divided into two categories: traditional downstream industries, including VCM motors and personal consumer electronics products; new energy and energy-saving and environmental protection industries, including energy-saving wind power generation equipment, energy-saving elevators Traction mechanism operation, energy-saving and environmentally friendly air conditioners (inverter air conditioners), EPS and hybrid cars.
Permanent magnet motor is a high-efficiency and energy-saving product, with an average power saving rate of more than 10%. The power saving rate of permanent magnet motors using high-performance NdFeB magnet permanent magnet materials can be as high as 15% to 20%. In wind turbines, compressors and other occasions that require stepless frequency conversion speed regulation, permanent magnet frequency conversion speed regulation can save electricity by more than 30%. The world's advanced level of motor energy saving is that the operating power of the fan itself is generally above 80%, and the operating power of the system is about 85%.
