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Aerostatic bearings: The gas is externally pressurized (using a compressor or a pressure tank) and injected in the clearance of the bearing. Consequently, aerostatic bearings can sustain loads even in the absence of relative motion but require an external gas compression system, which induces costs in terms of complexity and energy.
Some air conditioning equipment manufacturers install crankcase heaters either in the compressor (insertion type), or mount them externally around the base of the compressor (bellyband type). The two wires of the heater are wired directly to the input side of the contact from the main power supply, and power is always supplied to the heater.
In air conditioning, an inverter compressor is a compressor that is operated with an inverter. In the hermetic type, it can either be a scroll or reciprocating compressor . This type of compressor uses a drive to control the compressor motor speed to modulate cooling capacity.
This type of compressor, along with screw compressors, are extensively used in large refrigeration and air conditioning systems. Magnetic bearing (magnetically levitated) and air bearing centrifugal compressors exist. Many large snowmaking operations (like ski resorts) use this type of compressor.
To activate the compressor the clutch is activated. This connects the air conditioning compressor's shaft end to a pulley driven by the engine's crankshaft through a belt . Electromagnetic clutches have been used on diesel locomotives , e.g. by Hohenzollern Locomotive Works .
This arrangement is for cooling the lower end of the shaft, as this end of the vertical rotor is on the hot end of the ducting. The top end of the rotor has a simple roller bearing to hold the shaft in a vertical position. The rotor is built up on the vertical shaft with radial supports and cages for holding the baskets in position.