| 摘要 |
PURPOSE:To compensate the torque fluctuation of an electric vehicle effectively by detecting the reaching of the power factor and output voltage of a power converter to a predetermined maximum value and adjusting a frequency control means in response to a detected power factor in response to an output. CONSTITUTION:A pulse generator 10 is connected to a wheel 8, and speed frequency is converted into speed voltage fT by a speed detector 11. On the other hand, the slip-frequency fs setter 12 of a linear induction motor is mounted, and f=fT+ or -fs is arithmetically operated by a frequency controller 13. The frequency command (f) is input to a PWM controller 14, and the operating frequency of an inverter 5 is determined. The frequency command (f) is input to a voltage controller 15, converted into a voltage command V so as to keep the ratio V/f of voltage V to frequency (f) constant, and input to the PWM controller 14. The knowmn PWM controller 14 controls the ignition of a GTO thyristor in the inverter 5 on the basis of these frequency command (f) and voltage command V. Accordingly, a linear induction motor group is controlled in constant torque. |
