The AC motor inverter is first converted to DC power through an oscillating circuit, and then the DC power is switched to AC power by electronic components. Generally, a more powerful inverter uses a thyristor and an adjustable frequency device is set to make the frequency within a certain range. Internally adjustable is used to control the number of revolutions of the motor so that the number of revolutions can be adjusted within a certain range. AC motor inverters are often used for inverter UPS power supplies.
The frequency conversion speed regulation technology in solar power generation and wind power generation devices is an important development direction of modern power transmission technology. With the development of power electronics technology, AC frequency conversion technology gradually matures from theory to practice. The AC motor frequency converter not only has smooth speed regulation, large range, high efficiency, low starting current, stable operation, but also has obvious energy saving effect. Therefore, AC frequency conversion speed control has gradually replaced the traditional speed control systems such as slip speed control, pole-changing speed control, DC speed control, and it is more and more widely used in metallurgy, textile, printing and dyeing, tobacco machinery production lines and buildings, water supply and other fields, generally divided into rectifier circuit, smoothing circuit, control circuit, inverter circuit and other parts.