The description of the High Speed Powerfull Frequency Inverter in details as bellow:

our inverter AC Drives power;

0.4kw,0.75kw,1.5kw,2.2kw,3.7kw,5.5kw,7.5kw,11kw,15kw,18.5kw,22kw,30kw,37kw,45kw,55kw,

75kw,90kw,110kw,132kw,160kw,185kw,220kw,250kw,280kw,315kw.

How Does a VFD Work?
Induction motors, the workhorses of industry, rotate at a fixed speed that is determined by the frequency of the supply voltage. Alternating current applied to the stator windings produces a magnetic field that rotates at synchronous speed. This speed may be calculated by dividing line frequency by the number of magnetic pole pairs in the motor winding. A four-pole motor, for example, has two pole pairs, and therefore the magnetic field will rotate 60 Hz / 2 = 30 revolutions per second, or 1800 rpm. The rotor of an induction motor will attempt to follow this rotating magnetic field, and, under load, the rotor speed "slips" slightly behind the rotating field. This small slip speed generates an induced current, and the resulting magnetic field in the rotor produces torque.

Since an induction motor rotates near synchronous speed, the most effective and energy-efficient way to change the motor speed is to change the frequency of the applied voltage. VFDs convert the fixed-frequency supply voltage to a continuously variable frequency, thereby allowing adjustable motor speed.