Variable frequency speed regulation is to change the frequency of the motor stator power, thus changing the speed of its synchronous speed control method. The main equipment of the frequency conversion speed control system is the frequency converter that provides variable frequency power. The frequency converter is composed of power devices that can be turned off, such as GTO, GTR, IGBT, IGCT, etc., plus control, drive, and protection circuits. Inverters can be divided into AC-DC-AC frequency converters and AC-AC frequency converters. At present, AC-DC-AC frequency converters are widely used in China. Its characteristics are: high efficiency, no additional loss in the speed regulation process; a wide range of applications, can be used for cage asynchronous motors; speed range, hard characteristics, high precision, is the best speed control method for AC motors; technical complexity , High cost, difficult maintenance and overhaul.
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