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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.

Engineers at Davisco Foods International Inc. wanted to incorporate mix-proof valves into their process controls for three new cheese vats at the company''s Jerome, Idaho, facility. Unfortunately, the PMOs did not recognize any block-and-bleed valves that could handle the cheese curds the system would have to deal with. Rockford, Ill.-based Sudmo North America Inc. accepted the company''s challenge to design a valve that could handle large particulate without clogging and then dropshipscooterwholesale win regulatory approval for the design.