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China's motor drive equipment at that time the cost of the inverter is very high, such as squirrel-cage asynchronous motor is generally used for direct start, or with auto-coupling, star-delta starter. Later, there appeared an intelligent motor soft starter with a single-chip microcomputer as the core and a semiconductor thyristor as the actuator. However, the soft starter mainly solves the problem of the impact on the grid and the operation of the bypass contactor after starting the motor. It has a good protection effect on the motor, but there is no energy saving effect, so the inverter gradually replaces the function of the soft starter. Nowadays, the localization process of China's inverters is rapidly emerging, and the quality stability is progressing rapidly. With the advantages of service and cost, the cost-effectiveness of frequency conversion and speed regulation is high, and the competitive advantage of quality and price is obviously higher than that of foreign brands.
China's inverter industry has achieved localization in the development of more than a decade, the domestic inverter technology has been relatively mature, and the manufacturing cost has dropped significantly. China's soft starter industry has experienced a cost-effective change from booming to weakening. The price has dropped from 150 yuan per kilowatt to less than 50 yuan per kilowatt. The quality of many domestic enterprises is very stable, but the market is gradually shrinking. From the development of straight-start, auto-coupling and star-delta starters, to the emergence of frequency converters, the transition products of soft starters. At present, only a small part of the working conditions use soft starters, such as motor working load of more than 90%, other working conditions were previously started by soft start mode, and now most of them use inverters, because of the frequency converter The energy saving effect is about 30%. In addition, the price of the inverter has dropped from about 1,000 yuan per kilowatt in the early days to only 200 yuan per kilowatt (high power), and the price drop is very significant. Today's industrial and mining enterprises have fully popularized the application of frequency converters, covering almost all fields. It is no exaggeration to say that there is definitely a frequency converter in the place where the motor is used. Moreover, the frequency converter has the starting effect and energy saving effect required by the motor.

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