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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 different. A digitally controlled magnetic-bearing 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 magnetic cushion (Figure 1). Magnetic bearings--two radial and one axial--hold the shaft in position (Figure 2).

"By managing where and when the power is desired, we can provide fuel savings, emissions and productivity enhancements," Orr said. "With control of an accessory independent of engine speed, we can reduce accessory drag on an engine during engine cranking to enhance cold weather starting. Starting an electric engine oil pump just prior to engine cranking, for example, can provide a pre-lube function."Orr was describing the concept of Cat Electronics'' MorElectric system unveiled about a year ago. The MorElectric system is designed to drive a vehicle''s air conditioner, brake air compressor, water pump and other accessories electrically, versus being belt or gear driven. The system also includes a newly developed HVAC (heating, ventilation, air conditioning) package as well as an optional diesel-powered auxiliary power unit.

Though light in weight, Airbor magnetic drill has a powerful 1.6-hp air motor and 1,600-lb magnetic holding strength. With its extra rack, stroke length is extended to 10 1/4 in. Annular cutter capacity is up to 2 1/16 in. diam. Geared chuck adapter converts the unit to a standard drill press. The Slugger Air Force pneumatic drill, at 24 lbs, 6 1/4" high, is useful for confined area drilling. The drill''s features include a permanent magnet that turns on or off by air power, a cutter capacity of up to 1 1/16" diameter x 3/4" depth and the ability to use ShortSlugger cutters and frame cutters. These cutters'' geometry allows the operator to drill multi-layered truck frames in a single pass.

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