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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. * Tighten all hose connections so no air can enter the lines.* Set the spray wand to a low- or no-pressure setting to prevent recoil, or kickback, when the washer is started. Electric washers and gas washers with variable nozzles should be on low-pressure, wide fan settings. Gas washers with individual nozzle tips (photos, p. 30) should have their nozzle tip removed at this point.* Completely turn on the water faucet at the house. Squeeze the spray wand trigger to prime the pump and purge air from the system. The book continues forward through ever more precise lathes, backward to the screw press of the ancient Greeks, and backward even further to the water screw invented to raise water by Archimedes (c. 287- 212 B.c.), also a military engineer. The author comments that it is "as far as we know, the first appearance in human history of the helix," and the screw, like the spiral staircase, is a helix. The author continues: "The discovery of the screw represents a kind of miracle. Only a mathematical genius like Archimedes could have described the geometry of the helix in the first place, and only a mechanical genius like him could have conceived a practical application for this unusual shape." ©2003 www.utility-truck.net All rights reserved. |
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