| 摘要 |
PROBLEM TO BE SOLVED: To suppress a vehicle vibration while maintaining interior silence of an electric vehicle.SOLUTION: A step-up converter 12 executes DC voltage conversion between a DC power supply B and a power line 7 so as to controllingly vary a DC voltage VH on the power line 7 according to a voltage command value. An inverter 14 converts the DC voltage VH to an AC voltage applied to an AC motor M1 so as to control an output torque of the AC motor M1 according to a torque command value Tqcom. The output torque of the AC motor M1 mounted on an electric vehicle is transmitted to driving wheels 50 via a drive machinery system 40. If the absolute value of a current Ib of the DC power supply B as a passing current of the step-up converter 12 is lower than a reference value, a control device 30 controls the step-up converter 12 so as to vary the DC voltage at a frequency different from a resonance frequency of the drive machinery system of the electric vehicle. |
