CONTROL DEVICE FOR PERMANENT-MAGNET ROTARY MOTOR
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United States of America Patent
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Issued Date -
Jan 19, 2017
app pub date -
Feb 28, 2014
filing date -
Feb 28, 2014
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Abstract
A control device converts phase currents supplied to a permanent-magnet rotary motor into a d-axis current and a q-axis current on a dq coordinate axis, and calculates a current command (a d-axis current command or a q-axis current command) for changing at least one of values of the d-axis current and the q-axis current according to a rotor position, based on a torque command, the d-axis current and the q-axis current, so as to cause a magnitude of a reverse magnetic field acting on a permanent-magnet end part to be equal to or lower than a magnetic coercive force of a permanent magnet.
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