Working Principle

  • An inverter compressor is designed to operate with a drive which steplessly adjusts the speed of the compressor motor to deliver the cooling need.

    It can either be a scroll, rotary or reciprocating, semi-hermetic, open compressors, including screw, centrifugal and axial compressors. This type of compressor uses a special drive to control the compressor motor speed (measured in round per second RPS). Inverter compressors can operate at different speeds: the inverter compressor is specifically designed to run at different motor speeds thereby generating a modulated refrigerant mass oil flow and cooling output.

    The variable frequency drive indicates the cooling requirement to the compressor motor. The motor continuously adapts speed to produce more or less cooling capacity to match the exact cooling need. The combination of the two devices – compressor and drive – gives a continuous cooling modulation. The variable speed principle requires a very sturdy compressor for full speed running and a special compressor lubrication system for systems using oil. Excellent oil management is a critical requirement to secure compressor lifetime. The oil management system guarantees good lubrication of the scroll set at low speed and prevents excess oil from being injected into the circuit when operating at full speed to maintain a perfect Oil Circulation Ratio.

     

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