Method of detecting rotational position by using hall element and hall element resolver
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United States of America Patent
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Issued Date -
Jun 19, 2008
app pub date -
Oct 29, 2007
filing date -
Dec 18, 2006
priority date (Note) -
Abandoned
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Abstract
In a hall element resolver (10), a pair of hall elements (13, 23) are placed so as to generate detection signals, which include a phase difference of 90 degrees and are sine-curved, when a rotary magnetic drum magnetized with two poles rotates. Meanwhile, supplied as control currents Ic.sub.1 and Ic.sub.2 for driving the hall elements (13, 23) are alternate electric currents, which include a phase difference of 90 degrees and have the identical frequency, and balanced modulation signals, which include a phase difference of 90 degrees and are sine-curved, are output from the hall elements (13, 23) as detection signals V.sub.H1 and V.sub.H2. Then, a rotational position is calculated according to the balanced modulation signals. Thus, it is possible by using the hall elements to obtain detection signals which have resistance to a noise, and with which a transmission distance can be lengthened, as it is done by using a resolver.
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