gas air compressors

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This article describes this new compressor technology and its first use in an ARI-certified chiller design.THE BEARINGSTraditional centrifugal compressors use roller bearings and hydrodynamic bearings, both of which consume power and require oil and a lubrication system. Recently, ceramic roller bearings, which avoid issues related to oil and reduce power consumption, were introduced to the HVAC industry. The lubrication of these bearings is provided by the refrigerant itself. (1)Magnetic-bearing technology is significantly index different. a digitally controlled magnetic-bearing air and compressors system, consisting of both permanent magnets and electromagnets, replaces conventional lubricated bearings. the frictionless compressor shaft is the compressor''s only moving component. it rotates on a levitated index magnetic cushion (figure 1). magnetic bearings--two radial and one axial--hold the shaft in position (figure 2).

the motormost hermetic compressors use induction motors cooled by either liquid air or suction-gas refrigerant. induction compressors and gas motors have copper windings that, when air alternating current is run through them, compressors create the magnetic fields that cause the motor to turn. these copper windings are bulky, adding size and weight gas to the compressor.two-pole, 60-hz induction motors operate at approximately 3,600 rpm. a higher number of revolutions per minute can air be obtained by increasing the frequency. compressors that require higher shaft speeds compressors tend to use gears. while gears are a proven technology, they create noise and vibration, consume power, and require lubrication.the magnet-bearing compressor features gas a synchronous permanent-magnet brushless dc motor with a completely integrated variable-frequency drive (vfd). the stator windings found on conventional induction motors are replaced with a permanent-magnet air rotor. alternating current from the inverter energizes the armature windings. the stator (excitation) and rotor (armature) change places. compressors no commutator brushes are required. gas the motor and key electronic components are internally refrigerant-cooled, so no special cooling is required for the air vfd compressors or the motor.

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