Motor Controls

AC synchronous motor, high frequency converter operation successfully and Technology

The level of service reliability and power factor, the size of motor inertia moment and has control accuracy, the weak magnetic relationship with its own advantages for the big engine power, the world was inclined to be with the synchronous motor. Industrial high-power applications such as compressors, pumps, coal and power of non-ferrous metals and steel plants all lift-synchronous motor drive.

AC synchronous electric motor drive is a big Problem, my 70 years in the early 20th Century technology speed AC synchronous control of the search engine, the successful development of the 80's to pay? Experimental Prototype Fed synchronous motor, however, develop high-power AC drive to the end of 90 years. Conversion Devices in High-Power

now successful in the very rare Case of synchronous motors are used in foreign brands dominate the world. Currently, China is the rate control request large synchronous motor, although still in its infancy, but already widely used overseas. With its long-standing practice: the high-pressure system, the economic benefits of high-speed and variable power, the reliability be guaranteed. Therefore, our high-voltage synchronous motor frequency control devices in the future prospects of a huge market.

Shanghai Electric and Power of Design Research Institute since 1999 by the inverter voltage high national and international level through extensive research, collect data to compare the same time, has created a total solution technology of multi-level units in series mode. After several years of hard work, late 2002 1250kw/6kv high-voltage converter prototype developed in July 2003, organized of the Shanghai Economic Commission identification. September 2003 officially put into operation, the product, once introduced, many honors. End of 2005, our company has successfully the largest capacity of the internal stress develops high-performance UPS 5000kW applied Ningxiaduowei Pharmaceutical Co., Ltd. successfully. In 2006, the company began to develop the capacity of the UPS high voltage 9600kw/10kv, has been successfully been applied in the spring of 2007, the national research program and high-tech development (863) special issue. The company has successfully MAXFEED synchronous high-frequency device developed in October 2007, Henan, an opinion, Ltd. air compressor fertilizer successful operation of a synchronous motor.

Two, the speed of a synchronous motor control system problems
Synchronous motor and asynchronous motor operation in the main difference is that in the Execution is a synchronous motor, voltage vector and the reinforcement angle between the magnetic pole position of the rotor should be within a certain range, otherwise the system . happen It's why, when the speed control synchronous motor must always control the angle changes in the permitted range of the synchronous motor and asynchronous frequency-difference the primary endpoint. The following briefly describes the process of settling velocity of the synchronous motor difficulties and by the frequency converter MAXFEED to solve this problem:

(1) The synchronous motor startup

Synchronous motor is usually started in two ways: a kind of exciting when you first start, at the same time an early induction, after the excitement of polarity. The synchronous motor drive is used to determine voting for the first time to Lai, starts at the same time, but often do not display correctly the position of the rotor of the motor will not start properly. To control the frequency of the synchronous motor is simple to use asynchronous start polarity Reed, then the device MAXFEED often at the beginning of the induction motor torque is rated soft get simultaneous synchronous motor through the start polarity 8hz, Lai particular the level of investment and the promotion of investment, if the excitation frequency can be determined by application debugging. Sun rotor of the motor and the angle between the magnetic field of the stator magnetic field by a small amount of shock absorption, the rotor, the stator poles of attraction for reliable, synchronous synchronous motor in the state. UPS to set speed, slowly accelerated to a certain speed. At this point, synchronous motor induced voltage vector and the angle between the position of the rotor magnetic pole of a constant broadening Value of rotor poles attract the stator magnetic field to expect a gradual rate of acceleration of the process of starting point is a synchronous motor is over. About the Author

I am China Crafts Suppliers writer, reports some information about marine gasoline generators , kipor inverter generator.