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The author then takes the first of a number of ruminative breathers, speculating on the button. The Romans used buttons only as ornaments and even the ancient Chinese never progressed beyond the toggle and loop. Unlike the handsaw, which was refined over time, the button and its buttonhole simply appeared in northern Europe in the thirteenth century--true works of an anonymous inventive genius. Then we proceed to an influential treatise on ingenious machines published in 1588 by Agostino Ramelli, a military engineer. Among the machines is a bookstand that revolves like a Ferris wheel, holding eight books at a constant angle by means of a gearing system used in astronomical clocks. The author comments: "Of course, gravity would have done the job equally well (as it does in a Ferris wheel), but the gearing system allowed Ramelli to demonstrate his considerable skill as a mathematician." Then the author writes: "This splendid folly distracts me-I''m supposed to be looking for screwdrivers."
THE MOTORMost hermetic compressors use induction motors cooled by either liquid or suction-gas refrigerant. Induction motors have copper windings that, when alternating current is run through them, create the magnetic fields that cause the motor to turn. These copper windings are bulky, adding size and weight to the compressor.Two-pole, 60-Hz induction motors operate at approximately 3,600 rpm. A higher number of revolutions per minute can be obtained by increasing the frequency. Compressors that require higher shaft speeds tend to use gears. While gears are a proven technology, they create noise and vibration, consume power, and require lubrication.The magnet-bearing compressor features a synchronous permanent-magnet brushless DC motor with a completely integrated variable-frequency drive (VFD). The stator windings found on conventional induction motors are replaced with a permanent-magnet rotor. Alternating current from the inverter energizes the armature windings. The stator (excitation) and rotor (armature) change places. No commutator brushes are required. The motor and key electronic components are internally refrigerant-cooled, so no special cooling is required for the VFD or the motor.
Gene Gall, sales manager for the Cim-Tek unit from Central Illinois Manufacturing, Bement, Illinois, says fuel suppliers who use the unit typically learn the same thing. "There''s a lack of proper fuel maintenance on many farms. Farmers don''t change tank filters regularly, and they don''t drain deposits from the bottom of tanks."Caring for stored fuelChuck Hamilton, technical service engineer with Country Energy in Minneapolis, Minnesota, says 90% of the diesel fuel problems he sees are from dirt, rust, and water contamination. "Even many cold-weather problems are from water contamination, not fuel gelling. The vast majority of these problems can be eliminated with proper fuel tank maintenance on the farm," he says.
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