Drive method is probably the simplest method of differentiating compressors.The compressor, whether reciprocating or rotary, can be v-belt driven, direct coupled, or either of the above accompanied by a variable frequency drive. The simple v-belt drive is most commonly seen on the air cooled reciprocating compressor, and smaller rotary screw compressors. V-belt drives provide for versatility in selecting optimum speeds for the desired flow and pressure. Direct drive (coupled) compressors require that the air end be constructed to maximize the flow (CFM) for a given horsepower motor, or use internal gears to adjust the speed of the compressor to achieve this maximum flow.
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