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Motor Speed

AC synchronous motor High Frequency Converter successful operation and technology

The amount of reliability and maintenance, power factor, motor size and moment of inertia, control precision, the weak magnetic ratio has its own advantages, for large-capacity motor, the world has been basically tend to use the synchronous motor. High-power industrial applications such as air compressors, pumps, coal and nonferrous metals industry power hoist large capacity rolling mills and steel mills all adopts synchronous motor drive.

AC synchronous electric drive motor speed is a major problem area, 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 develop. Domestic high-power conversion devices

now successfully used in very few instances of synchronous motors are foreign brands dominate the world. At present, China Application of frequency control of large synchronous motor although still in its infancy, but already widely used overseas. Through their long-term operation and practice: The High pressure The economic benefits of high-power variable speed system well, its reliability can be guaranteed. Therefore, our high-voltage synchronous motor frequency control devices in the future prospects of a huge market.

Shanghai Power Equipment Complete Electrical Design and Research Institute since 1999 by the domestic and international high voltage inverter through extensive research, collect data to compare the same time, established a total technology solutions to multi-level units in series mode. After several years of unremitting efforts, by the end of 2002 1250kw/6kv high voltage inverter prototype developed, in July 2003 hosted by the Shanghai Economic Commission Identification of the product. September 2003 formally put into operation, the product, once introduced, were many honors. The end of 2005, our company successfully developed the largest capacity of domestic production of high voltage inverter, capacity 5000kw, in Ningxiaduowei Pharmaceutical Co., Ltd. successfully put into operation. In 2006, the company began to develop 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 issue. The company has successfully developed maxf High Frequency Synchronous device, in October 2007 in Henan, one mind, Ltd. air compressor fertilizer on successful operation of a synchronous motor.

2, synchronous motor speed regulation technology Difficulties

Synchronous motor and induction motor running on the main difference is that in the run-time synchronous motor, the armature voltage vector and the angle between the rotor magnetic pole position must be within a certain range, otherwise it will cause the system to step. Therefore, when the synchronous motor speed regulation must always be to control the angle changes in the permitted range, it is the synchronous motor and induction motor variable frequency main difference. The following 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 usually started in two ways: a kind of exciting in the first, simultaneous start; an asynchronous start, after the excitation polarity. The synchronous motor frequency converter are used first to vote Lai, simultaneous start, but often do not appear correctly determine the rotor position caused motor failed to start. For synchronous motor frequency control, is easy to use asynchronous start, Reed polarity mode, so maxf frequency device on the simultaneous asynchronous motor soft 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 determined according to different applications debugging. Thus, the motor rotor and the stator magnetic field angle between the magnetic field through a small amount of shock damping, the rotor magnetic pole is the stator poles attract reliable, synchronous motor synchronous operation into the state. Inverter In accordance with the predetermined acceleration, gradually accelerate to a given frequency. At this point, synchronous motor armature voltage vector and the angle between the rotor magnetic pole position gradually widening to a constant value of rotor pole attracting the stator magnetic field to expect a gradual acceleration speed, synchronous motor starting process is complete.
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