A frequency inverter adjusts the frequency of alternating current (AC) and voltage. It is primarily used with asynchronous motors, which are common in pumps, fans, conveyors, elevators, cranes, and various industrial equipment.
The rotational speed of an asynchronous motor depends on the frequency of the three-phase power supply and the number of motor poles. When powered by a standard electrical network, the motor operates at a nearly constant speed. However, many applications require adjustable motor speed, which is achieved using a frequency inverter.
By enabling variable-speed drives, frequency inverters provide precise control over processes and help save energy.