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n about vfd control methods
Frequency variable technology comes into the world because there is a great demand of stepless speed regulation. After 1920, the development of device upgrade promotes the development of electronics technology. In 1980, the PWM mode optimization, the core technique of varying frequency, has attracted great attention of people. It drew a lot of PWM optimization methods that the saddle-shaped wave PWM (SAPW) mode works best. After 1980, the VVVF variable frequency drive has been announced to the market with a wide application range. Main Control Modes of Variable Frequency Drive The low voltage frequency inverter are of voltage output 380V～650V, frequency output 0.75KW ～400KW, 0～400Hz. Its control modes have experienced the following 4 generations: 1. U/f=C Sine Pulse Width Modulation Control Mode It features simple control circuit structure, low cost and good mechanical properties hardness. It meets the requirements of common smooth... (more)