The working principle of variable frequency motor

The main circuit is the power conversion part that provides the voltage regulation and frequency regulation power supply for the asynchronous motor. The main circuit of the frequency conversion motor can be roughly divided into two categories: the voltage type is a frequency conversion motor that converts the DC voltage of the voltage source into an AC frequency conversion motor, and the filter of the DC circuit is a capacitor. . The current type is a variable frequency motor that converts the DC of the current source into an AC, and its DC loop filter is an inductance. It consists of three parts, a "rectifier" that converts power frequency power into DC power, a "smoothing loop" that absorbs the voltage pulsation generated by the converter and inverter, and an "inverter" that converts DC power to AC power Transformer".
The use of AC variable frequency speed regulation motor has significant advantages over DC speed regulation motor:
(1) It is easy to adjust the speed and save energy.
(2) The AC motor has simple structure, small size, small inertia, low cost, easy maintenance and durability.
(3) It can expand the capacity and realize high speed and high voltage operation.
(4) Soft start and quick braking can be realized.
(5) No sparks, explosion-proof, strong environmental adaptability.
waylead.com.cn