400VAC Variable Speed AC Motor Inverter Drives for Compressor

400VAC Variable Speed AC Motor Inverter Drives for Compressor

A compressor is a mechanical device that takes in a medium and compresses it to a smaller volume. Compressors can either increase or decrease a given mass to a lower or higher pressure. A mechanical or electrical drive is typically connected to a pump that is used to compress the medium.

Compressors have many everyday uses, such as:

·?Air?conditioners, ?(car, ?home)

·?Air?pumps

·?Home?and?industrial?refrigeration

·?High?pressure?car?washes

·?Hydraulic?compressors?for?industrial?machines

·?Air?compressors?for?industrial?manufacturing

Compressors?are?used?by?many?industries?that?depend?on?the?power?of?compressed?gas?or?fluid?to?power?manufacturing?processes?of?all?kinds.

There are several different compressor types:

· Rotary screw compressor
Two helical rotors force gas into a chamber that decreases in size, thereby increasing the pressure of the gas. The screws in the rotary screw compressor can be lubricated with oil or non-lubricated. Oil-free compressors are used for gas that must remain clean and uncontaminated. Rotary screw compressors are typically sized from 30-200 horsepower.

· Reciprocating compressor
One or more pistons are moved inside a cylinder to increase the gas pressure. This is similar to a combustion engine without the ignition of fuel. Just like a car, the pistons generate much heat so the reciprocating compressor is typically cooled by air or water. Multi-stage reciprocating compressors pass the compressed gas from one cylinder to another, increasing the pressure in each stage. Most industrial compressors are multi-stage, ranging from one to 500 or more horsepower.

· Centrifugal compressor
Centrifugal compressors speed up and compress gas via a rotor with blades. Centrifugal force is used to force the air or gas to an outer chamber under higher pressure. Centrifugal compressors are designed to operate above 75-80% speed. Surging can occur below these speeds. This makes the centrifugal compressor ideal for continuous high duty operation.

Application?Challenges

· Varied compressor I/O that must interface with the AC drive to control compressor functions.

· Reduce energy consumption

· Constant pressure regulation

· Constant torque load requirement

· Starting torque

Features?of?G7?series?matching?compressor?application

Power?range?of?G7?VFD

Voltage:?400VAC?(380VAC?–?460VAC)

Power:?22kw/30HP?–?1000kw/1250HP

Specification?of?G7?VFD