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[FIGURE 1-2 OMITTED]When the magnetic bearings are energized, the motor and impellers, which are keyed directly to the magnetic shaft, levitate. Permanent-magnetic bearings do the primary work, while digitally controlled electromagnets provide the fine positioning. Four positioning signals per bearing hold the levitated assembly to a tolerance of 0.00002 in. As the levitated assembly moves from the center point, the electromagnets'' intensity is adjusted to correct the position. These adjustments occur 6 million times a minute. The software has been designed to automatically compensate for any out-of-balance condition in the levitated assembly.SHUTDOWNS AND POWER FAILURESWhen the compressor is not running, the shaft assembly rests on graphite-lined, radially located touchdown bearings. The magnetic bearings normally position the rotor in the proper location, preventing contact between the rotor and other metallic surfaces. If the magnetic bearings fail, the touchdown bearings (also known as backup bearings) are used to prevent a compressor failure. Waldon, Fairview, Okla., got into this product area three years ago when it purchased the rights to the LoDi model 815. The 815 was discontinued and replaced by a newly designed model LB25, which Waldon has been selling for the past two years. A new model, the LB30, was just released this past January and will eventually replace the LB25. Just how far will this market go? Well, consider that I thought the market would pass the 6000-unit mark about two years from now, rather than in 1999. This time, I believe demand will continue to grow through the next three or four years, with industry sales reaching an annual level of about 7000 units during that time. I watch Riley paging through the book Diggers, a string of drool swaying gently from his chin. Here is the Big Muskie, the biggest shovel ever made (a bus sits in the blade), the trencher, the mole that dug the Chunnel. "Mama, read it!" he commands. We start over, examining each picture in detail, and I realize again how much I am enjoying myself. would never have spontaneously decided to research construction vehicles. But here I am now, able to inform unenlightened acquaintances about the difference between backhoes and bulldozers. I perk up when I pass a construction site, even if Riley is not with me. It''s so much fun that I hope I''ll be able to let it go when he does -- when his interest turns to, say, weaponry, as everyone assures me it will. I can see myself, birthday after birthday, giving him the latest innovation in construction machinery toys, while a teenaged Riley, too shy to point out that he is now into tax law, accepts them politely and without enthusiasm. ©2003 www.utility-truck.net All rights reserved. |
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