Motor drive apparatus and discharge control method of the same
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United States of America Patent
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Jul 5, 2016
Grant Date -
Sep 3, 2015
app pub date -
Oct 16, 2013
filing date -
Oct 19, 2012
priority date (Note) -
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Abstract
An object is to perform discharge of a capacitor using a motor without rotating the motor even when connected to a position sensorless motor. The motor drive apparatus calculates a voltage pulse width at which a motor does not rotate or vibrate using a both-end voltage of a smoothing capacitor and an inductance estimation value of the motor, and applies a voltage with the voltage pulse width to the motor to calculate an inductance. Then, a rotor position is estimated using the inductances calculated for individual switching patterns. A motor current is caused to flow on the basis of the estimated rotor position to perform discharge of charge accumulated in the smoothing capacitor.
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