| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric vehicle control device that can control backing up of a VVVF inverter by precisely detecting the backing up of an electric vehicle. SOLUTION: The electric vehicle comprises the VVVF inverter 1 that converts a DC current fed from an overhead wire into a prescribed voltage and a frequency; an induction motor 7 that does not have a speed sensor that makes the electric vehicle travel with an output of the VVVF inverter 1 as a power supply; and a current sensor 2 that detects a current fed to the induction motor 7 from the VVVF inverter 1. Also the electric vehicle also is provided with a DC excitation current feeding means 1 that feeds a DC excitation current to the induction motor 7 from the VVVF inverter 1 in a fine period immediately, after the start of the VVVF inverter 1; an index operation integrator 5 that operates index indicating the direction, where the induction motor 7 is rotated from Q-axis current generated by the feeding of the DC excitation current by the DC excitation current feeding means; and a retraction detection means 6 that compares the index with a retraction detection setting value and detects the retreat. COPYRIGHT: (C)2007,JPO&INPIT
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