Phase detector, motor drive controller, motor device, and method of detecting phase of rotor
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United States of America Patent
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Dec 6, 2016
Grant Date -
Sep 10, 2015
app pub date -
Feb 27, 2015
filing date -
Mar 6, 2014
priority date (Note) -
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Abstract
A phase detector includes a crossing-point phase detection circuit to compare signals levels of pairs of sensor signals and output crossing-point phase detection signals indicating phases of crossing points between the pairs of the sensor signals, each having a signal level corresponding to a rotational position of a rotor of a motor having coils, a crossing-point level detection circuit to output crossing-point level signals indicating crossing-point levels detected, a signal selection circuit to select one of the sensor signals as a selection signal, a phase detection circuit to detect that a signal level of the selection signal has reached a threshold level, and output a phase data signal indicating a phase of the rotor corresponding to the threshold level, and an in-phase level adjustment circuit to adjust and output in-phase levels of the sensor signals to approach each of the crossing-point levels to a predetermined signal level.
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