The value of stability and conservation, power element, motor size and moment of inertia, control precision, the feeble fascinating ratio has its own advantages True Religion Men's Jack Hang em Low Gunfighter Jeans, as large-capacity motor, the globe has been basically tend to use the simultaneous motor. High-power industrial applications such for wind compressors, pumps, coal and nonferrous metals manufacture power elevator great capacity rolling mills and iron mills always adopts simultaneous motor steer. AC synchronous electric drive motor speed is a important problem district, my 70's from the start of the 20th century AC synchronous motor speed control technology research, the successful development of the early 80's pay? Fed synchronous motor of the experimental prototype However, high-power AC frequency converter up to late 90's to amplify. Domestic high-power conversion devices now successfully accustomed in quite few instances of synchronous motors are foreign brands dominate the globe. At present, China Application of frequency control of large synchronous motor nevertheless still in its childhood, yet yet warmhearted accustom overseas. Through their long-term action and practice: The High pressure The economic benefits of high-power variable speed system well, its reliability tin be guaranteed. Therefore, our high-voltage synchronous motor frequency control devices in the hereafter prospects of a colossal market. Shanghai Power Equipment Complete Electrical Design and Research Institute since 1999 by the domestic and multinational lofty voltage inverter through vast research, gather data to liken the same time, established a total technology solutions to multi-level units in catena mode. After several annuals of unremitting exertions, along the end of 2002 1250kw/6kv high voltage inverter model developed, in July 2003 hosted at the Shanghai Economic Commission Identification of the production. September 2003 formally put into action, the production, once introduced, were many glories. The end of 2005, our enterprise successfully adult the largest capacity of servant creation of high voltage inverter, capacity 5000kw, in Ningxiaduowei Pharmaceutical Co., Ltd. successfully put into operation. In 2006, the enterprise began to amplify the capacity 9600kw/10kv the high voltage inverter, has been successfully applied in early 2007 was the National High Technology Research and Development Program (863 Program) special publish. The company has successfully developed maxf High Frequency Synchronous device, in October 2007 in Henan, 1 mind, Ltd. atmosphere compressor manure above successful operation of a synchronous motor. 2, synchronous motor speed regulation technology DifficultiesSynchronous motor and induction motor fleeing on the main difference is namely in the run-time synchronous motor True Religion Women's Billy Body Rinse Jeans, the armature voltage vector and the angle between the rotor catching pole position have to be within a definite scope, otherwise it will cause the system to step. Therefore, while the synchronous motor speed regulation must always be to control the angle changes in the permitted range True Religion Women's Cassidy Bleached Jeans, it is the synchronous motor and induction motor variable frequency cardinal distinction. The emulating briefly describes the process of synchronous motor speed regulation and the difficulties encountered by maxf frequency converter to solve this problem: (1) The Excitation synchronous motor start-up process Synchronous motor is commonly started in two ways: a kind of exciting in the first, concurrent begin; an asynchronous start, after the excitation polarity. The synchronous motor frequency converter are used first to referendum Lai, simultaneous start, but often do no emerge correctly decide the rotor situation caused motor failed to start. For synchronous motor frequency control, is easy to use asynchronous start, Reed polarity mode, so maxf frequency device ashore the simultaneous asynchronous motall butft start, achieve rated starting torque, the synchronous motor is about to start to 8hz polarity Lai, specifically the size of investment and investment encouragement when the excitation frequency can be decisive along to another applications debugging. Thus, the motor rotor and the stator magnetic field angle between the magnetic field through a small amount of impact damping, the rotor magnetic pole is the stator poles fascinate authentic, synchronous motor synchronous operation into the state. Inverter In agreement with the predetermined acceleration, gradually expedite to a given frequency. At this point, synchronous motor armature voltage vector and the angle between the rotor magnetic pole position gradually amplifying to a constant amount of rotor pole attracting the stator magnetic field to expect a gradual haste speed, synchronous motor starting process is complete.