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Saturday, December 4, 2010

Variable Speed Compressors

Variable Speed Compressors are also know as variable speed drive compressors, and are air compressors that take advantage of variable speed drive technology. They employ a special drive which controls the RPM (Revolutions Per Minute) speed of the compressor, and this in turn saves energy when compared to its fixed speed equivalent.

The most common form used in the air compressor industry uses a variable-frequency drive, and this is used to convert the AC input power to DC and then back to a quasi-sinusoidal AC power, with the use of an inverter switching circuit.

The main benefits are, reduced power cost, reduced power surges, and the delivery of more constant pressure. The downside is the heavy expense of the drive and their sensitivity to heat and moisture.

They combine a speed inverter, which converts the AC signal to DC and speeds up or slows down the motor, with a pressure transducer to precisely match the compressed air output to demand. The energy efficiency of these compressors results in worthwhile savings on energy costs for users with fluctuating compressed air requirements. The demands for air in nearly every compressed air system fluctuate to some extent. If a compressor has a fixed speed, then it means that it will be switching on and off and probably running inefficiently.

As energy costs have increased it has become more cost effective to use these compressors. These types of compressors will only produce the volume of compressed air required and can be a very effective way of saving energy. If more than one fixed compressor is used, it may be more cost effective to have only one compressor to handle the variable part of the air demand. Studies have proven that better control, housekeeping and maintenance could save operators up to one third of the energy used across their compressed air systems.

There are other types of air compressors and these can include:
  • Rotary screw compressors
  • Variable speed compressors
  • Vane compressors
  • Reciprocating compressors
With the focus on reducing your carbon footprint, variable speed technology can reduce electrical running costs whilst maintaining system reliability.

If you are in need of this service check out our product pages, they contain many companies that specialise in this. John Cheesman writes about Variable Speed Compressors. Visit the Businessmagnet product page for details and suppliers of Variable Speed Compressors.

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