Patent ID: 6995540
Filing Date: 2006-02-07
Classification: H02P

Abstract:
1. An electric motor car controller for smoothing DC power collected from an overhead wire via a filter reactor and a filter capacitor, converting the DC power into AC power with a power converter, driving a vehicle-driving AC motor, and calculating a voltage command to be applied the power converter based on a d-axis current command value and a q-axis current command value commanded by a voltage coordinate converter, the electric motor car controller comprising: a voltage detector for detecting a voltage across the filter capacitor; an energy amount calculator for calculating an amount of energy of the filter capacitor from the voltage detected by the voltage detector; a frequency band component detector for extracting a given frequency band component contained in the amount of energy; a frequency band component coefficient unit for multiplying the frequency band component by a given coefficient and outputting a q-axis current command correcting value; and a q-axis current command correcting value adder for correcting the q-axis current command value by adding the q-axis current command correcting value to the q-axis current command value.