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The use of permanent magnets instead of rotor windings makes the motor smaller and lighter than induction motors. Using 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.

About SPS CommerceSPS Commerce is the leading provider of hosted supply chain integration services. The company specializes in managing trading partner enablement and management programs to increase the depth and/or breadth of integration with trading partners -- especially small and mid-sized partners. Our solution has helped many large retailers and distributors, electronically enable and integrate over 52,000 trading partners into their e-supply chain. For more information, visit www.spscommerce.com or call (651) 603-4400. SPS Commerce is a registered trademark of SPS Commerce Inc., spscommerce.net and the SPS Commerce logo are the property of SPS Commerce, Inc. All other names and trademarks are the property of their respective holders. In 1996 my wife and I purchased a house on 15 acres in suburban Pittsburgh, Pennsylvania. The land, which had been neglected for many years, consisted of about two acres of lawn, another two acres of badly overgrown pasture and the remainder was wild woods. We knew we needed a tractor to help us take care of it all, but what kind, how big, what features and how much were all questions we hadn''t a clue how to answer. Since then we''ve learned a lot about tractors from milwaukeepowertools friends, neighbors, tractor dealers and, of course, the Internet. We also learned we weren''t alone: Lots of other people moving from a city environment to a rural one had many of the same questions about tractors. This article is condensed from the information we''ve learned about tractors over the past several years. I decided to gather the common questions and answers we''d discovered into a Web site called "The Small Tractor FAQ (Frequently Asked Questions)." You are welcome to visit the Web site (www.andrew.cmu.edu/user/kb13/TF_home.htm), which contains links to tractor manufacturers, implement suppliers, tractor discussion groups and lots of other information and resources for and about small tractors.