| 摘要 |
<p>PURPOSE:To obtain a high power from a drive motor in an electric motor vehicle by closing a bypass contactor connected directly to the drive motor from a power source after the speed of the vehicle is accelerated higher than a predetermined speed. CONSTITUTION:A magnetic phase shifter 13 produces an acceleration signal voltage responsitve to the depressed stroke of an accelerator pedal to a control winding C, a current signal voltage from a current detector to a control winding d, and a rectangular voltage c having a current flow rate through differentiating circuits 18, 19 to thyristors 6, 7, respectively of a speed control circuit 3. A voltage comparator 28 produces a signal when the current flow rate becomes equal to the reference input voltage value, and a comparator 29 produces a signal when an accelerator is fully opened. The excitation coil 20 of a bypass contactor 20a is excited by the output signals from both the comparators. When a high power switch 26 is closed, the reference input voltage value of the comparator 28 is decreased.</p> |
