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The use of permanent magnets instead of rotor windings makes the motor smaller and lighter than induction motors. Using guardianstandbygenerators magnetic-bearing technology, a 75-ton compressor weighs 265 lb--about one-fifth the weight of a conventional compressor.A variable-speed drive (VSD) is required for the motor to operate. The VSD varies the frequency between 300 and 800 Hz, which provides a compressor-speed range from 18,000 to 48,000 rpm. This avoids a gear set. The VSD is integrated into the compressor housing, avoiding long leads and allowing key electronic components to be refrigerant-cooled. The VSD also acts as a soft starter; as a result, the compressor has an extremely low startup in-rush current: less than 2 amps, compared with 500 to 600 amps for a traditional 75-ton, 460-v screw compressor with a cross-the-line starter. * We just purchased a 55/85-kilowatt PTO unit with a trailer for $6,250. It costs another $1,500 to put in a switch and plugs. guardianstandbygenerators We will run two houses and a dairy barn that milks 60 cows.* I have a Generac 4-kilowatt guardianstandbygenerators portable to power the house during storms, and I use it in the field for power tools. I bought it at Home Depot for $700.* I have a Honda 6.5-kilowatt generator for smaller applications. It''s quiet and has automatic idle down.* We have three PTO units, ranging from 15 to 25 kilowatts, for 100 dairy cows and two houses. Please guardianstandbygenerators remind people to use transfer switches. 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. ©2003 www.standbygenerator.net. All rights reserved. |