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The most advanced vacuum cleaners are now using brushless drives, with operating speeds in excess of 100,000 revs/min. The drives are very sophisticated, but must also maintain low-cost. Sensorless control is desirable, but most sensorless methods involve extensive computation, which is prohibitively expensive at such high speeds. This paper looks at a 100,000 r/min, 1,600 W switched reluctance machine...
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