Patent ID: 8339076
Filing Date: 2012-12-25
Classification: G01D,H02P

Abstract:
1. An electric motor drive control apparatus including a DC/AC converting section that converts a DC system voltage to an AC voltage by using a detection angle of a resolver provided for a rotor of an AC electric motor, and supplies the AC voltage to the AC electric motor, the electric motor drive control apparatus comprising: a detection angle obtaining section that obtains the detection angle of the resolver; a correction information storage section that stores correction information for correcting the detection angle, in association with a modulation ratio that is a ratio of an effective value of a fundamental wave component of the AC voltage to the system voltage; and a detection angle correcting section that obtains the correction information from the correction information storage section, based on the modulation ratio at the time the detection angle obtaining section obtains the detection angle, and corrects the detection angle based on the correction information, wherein the correction information stored in the correction information storage section includes information for correcting an error of the detection angle, which increases with an increase in switching noise of a switching device included in the DC/AC converting section.