Motor control device and electric steering system
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United States of America Patent
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Mar 11, 2014
Grant Date -
Feb 10, 2011
app pub date -
May 28, 2009
filing date -
May 28, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A motor control device includes: a rotation angle detection portion that detects a rotation angle of a motor and outputs a rotation angle signal; an abnormal condition detection portion that detects the presence or absence of an abnormal condition of the rotation angle detection portion; a rotation angle estimation portion that estimates the rotation angle of the motor and outputs an estimate rotation angle signal; and a driving control portion that controls driving of the motor on the basis of the rotation angle signal, which is output from the rotation angle detection portion, when the abnormal condition detection portion does not detect an abnormal condition of the rotation angle detection portion, and controls driving of the motor on the basis of the estimate rotation angle signal, which is output from the rotation angle estimation portion, when the abnormal condition detection portion detects an abnormal condition of the rotation angle detection portion.
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