Research and Development of Premium-efficiency Permanent Magnet Synchronous Motor

　　Research and Development of Premium-efficiency Permanent Magnet Synchronous Motor
　　As a sub- project of national science and technology key project——"The Research andDevelopment of High Performance Rare Earth Permanent Magnet Machine ", this paper presents the research on several key questions of designing premium-efficiency permanent magnet synchronous motor uses in the fan or pump ,such as efficiency, power factor, pull-out torque and so on. The achievement that has value in the Engineering is obtained.First of all, in this paper the rare earth magnets influence of the fan on the efficiency of motor is analyzed. As the premium-efficiency permanent magnet motor used in the fan and the pump, the rotating speed of motor is high, the influence of the fan on the efficiency of the motor is extremely obvious. The loss of traditional centrifugal fan is approximately 3% of total loss in 2 pole-pair motor. Therefore, in this article the characteristics and the merits of axial-flow fan are used, substituting the axial-flow fan for traditional centrifugal fan.
　　According to the theoretical calculation and the experimental confirmation, those measures receive good effect.Next, in the process of researching how to enhances the efficiency of motor, in this paper the time-stepping finite element method is used, the calculation formula has modified, achieved good effect, the theory basis for later calculation of iron loss of permanent magnet motor is found. Meanwhile, detail analysis and research on the factors that have influence on the iron loss, the copper loss and the stray losses are conducted, the corresponding measures are taken in order to reduce these kinds of losses.Then, through synthesis considering of these factors, the optimized http://www.chinamagnets.biz design of two types of motors is carried in anneal arithmetic. The optimized design of the stator lamination mainly aims for minimizing the sum of the copper loss and the iron loss. The optimized design of the rotor is taken mainly including the rotor magnetic circuit, the shape of rotor slot, magnetic bridge, etc. At the same time, the air gap length of the motor is also optimized.Finally, prototypes of permanent magnet motor of two specifications are developed.The prototypes have achieved the anticipated effect and passed the appraisal, the conclusion is "theinternational leading level". Meanwhile, it also proves that the achievement has an important value in practical application.