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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.

"Fuel filters on the tractors are removing 90% of these particles, but in Texas there are nearly 3 million in the 2- to 5-micron size compared to about 100,000 in Iowa. Even with only 10% of the particles getting by, there are still plenty of contaminants to cause problems," he says.Clampitt''s study shows that drier conditions in Texas contribute to more dust in storage tanks. However, he says he''s found more problems with the portable tanks used to transfer fuel to the field."Most farmers with injector problems use pickup tanks or tanks mounted on trailers to take fuel to the field. The fuel in these tanks is usually agitated, so contaminants are in suspension. The tanks often don''t have a filter because the operator doesn''t want to slow fueling capacity. They often don''t have a proper vent cap and the fuel nozzle isn''t shielded from road dust," he says. Petroleum storage is the greatest environmental risk on most farms

Dooley says contaminants typically are allowed to build up over long periods of time. "Many tanks we cleaned had been in place 30 years or more, often without being cleaned and seldom ever drained," he says.Rust in fuel tanks is probably also a result of them breathing through the vent cap. "At night, when temperatures cool, humidity in the air inside the tank condenses on the sidewalls and can cause rust," adds Dooley.Our study found few other contaminants. Little free water or algae was present and asphaltines (black specs of carbon that are sometimes a result of fuel refining) were limited.