Compressor Variable Frequency Drive

The starting current is controlled so that no large inrush occurs, which can result in overheating in the motor and a dip in the supply voltage. This capability of limiting inrush will save operations significant electrical charges. Generally, synchronous motors are employed for compressor power levels greater than 15 MW, though induction motors now range up to 25 MW. A speed increasing gearbox is typically required for standard speed motors like 1500/1800 rpm or 3000/3600 rpm motors. One of the?advantages of using variable frequency drives on motors?is that in many cases, the gear box can be eliminated by specifying a super high speed motor. Without a gearbox, the system efficiency increases 2%, however, there are tradeoffs with speed, cost, and power that have to be considered in order to determine if this is the best approach for the application