Rare earth permanent magnet material is a kind of high performance functional material, which is the foundation of many high and new technology industries. In the motor, the permanent magnet can make the motor products light and high, combine with the power electronics technology, and make the machine integrated product with speed and torque adjustable.
Rare earth permanent magnet motor is one of the largest applications, ndfeb magnet accounted for about 70% of the total magnets, form a complete set of computer's hard drive coil motor (VCM) accounted for 40% ~ 50%, so the computer industry is the biggest users of permanent magnet motor. The use of rare earth permanent magnet motor can significantly reduce the weight of the motor, such as 10kW ordinary generator with a weight of 220kg, while the dilute permanent magnet generator is 92k8. The 1095kW and 230rpm permanent magnet synchronous motor developed by Siemens in Germany is used for ships. Compared with the direct current motor used in the past, the volume is reduced by 60% and the total loss is reduced by 20%.
Rare earth permanent magnet motor is highly efficient and energy-saving, with an average saving rate of up to 10%, and some special motors have a power saving rate of 15% ~ 20%, and the price is reasonable. The high efficiency and energy-saving rare earth permanent magnet motor developed in China can not be compared with the foreign efficient motor in terms of force energy index and price, and has a strong competitiveness in the international market. All countries in the world to improve the motor efficiency, save power make a big deal to grasp, especially in America, the former US President George w. bush signed in 1992 approved the energy policy act, according to the law, since 199710 month 24, the United States most general efficiency of the motor will no longer production, only allow efficient motor production, after the October 2002 will produce more efficient motors, in October 2007, after the production technology on the limits, the highest efficiency motor economically feasible.
