Permanent magnet synchronous motor

Permanent magnet synchronous motor in the 1950 s.Its operation principle is the same as the ordinary electric excitation synchronous motor,but it to replace the field winding,permanent magnet motor structure more simple,improve the www.dongfeng-motor.com reliability of the motor running. With the development of power electronic technology and microcomputer,in the 1970 s,began to permanent magnet synchronous motor is applied to ac variable frequency speed regulation system.In the 1980 s,the development of rare earth permanent magnet material breakthrough Progress,especially the residual magnetism,high coercive force large and low prices of the third generation of new type of NdFeB permanent magnet materials (NdFeB),greatly promote the development of permanent magnet synchronous motor speed regulating system.

In particular I Are a large country with a rare earth materials,rare earth reserves and extraction of rare earth metals are the highest in the world.With the continuous permanent magnet motors for sale development of rare earth materials and technology,permanent magnet magnetic energy product has been high,the price also should meet the industry early The need of use,combined with vector control level unceasing enhancement,the permanent magnet synchronous motor is more and more big show high efficiency and power density,wide speed range and small ripple torque,etc.The advantages of high performance.In the rare earth permanent magnet materials in China And the scientific research level of rare earth permanent magnet motor has reached the international advanced level.

The application of the new type of permanent magnetic material in motor not only promote the motor structure,the design method and manufacturing process of the reform,but also ac three phase motormakes the permanent magnet synchronous .The performance of the motor have a qualitative leap,rare earth permanent magnet synchronous motor is high-power (ultra high speed,high torque) the direction of miniaturization,intelligent,high-performance,become an important branch in the field of ac speed regulation [1] [2]. Due to the power switch components,permanent magnetic material and drive control technology development level,the permanent magnet synchronous motor with rectangular wave form at first,on the principle and control single phase capacitor start induction motormode basically similar to dc motor,but it Kind of motor torque is larger fluctuations.In order to overcome this shortcoming,people on the basis of and developed the sine wave with position sensor,inverter driven permanent magnet synchronous motor,this makes the permanent magnet synchronous motor The broader prospects.