Modern equipment to ask all kinds of high performance motor industry  as military equipment request to provide a variety of high performance signal motor   mobile power station automation equipment with  aerospace of servo system and electric motor with high performance, high reliability, permanent magnet motor  chemical fiber equipment with high speed precision of frequency control of motor speed synchronous motor  nc machine tools, machining center, robots with high ratio of rare earth permanent magnet servo motor  computer with high precision oscillating motor and spindle motor and so on. Motor driven load protean   if all adopt the universal motor, in some cases,  technical economy is not very reasonable. So to develop the special motor  dedicated abroad accounted for about 80% of the total output of  general motor (20%). And our country is just the opposite  dedicated motor type accounts for only 20% of  accounted for 80%. Special motor is according to the different load characteristics of specialized design   such as oil field with pumping unit special rare earth permanent magnet motor power saving rate is as high as 20%.