Motor drive apparatus for brushless motor
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United States of America Patent
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Jun 17, 2014
Grant Date -
Sep 20, 2012
app pub date -
Mar 9, 2012
filing date -
Mar 16, 2011
priority date (Note) -
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Abstract
A motor drive apparatus that can be used to drive a wide range of brushless motors without any limit to a magnetic pole number of a rotor magnet. One rotational period T of the rotor magnet is obtained, and one period S of the sine wave drive signal according to a mathematical expression of S=T/(n/2). The one period S of the sine wave drive signal is updated at intervals of one period of the output signal from one magnetic pole detecting element among the three magnetic pole detecting elements.
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