| 摘要 |
PURPOSE:To continue a constant-speed drive by validating only a function for traveling an electric railcar at a constant speed during constant-speed traveling. CONSTITUTION:When a constant-speed command is ON, a switch 30 is connected to a constant-speed current pattern generator to enter a constant-speed drive. At the time of constant-speed driving, a current pattern signal 16-1 operated by the generator is output as a motor current Ipm necessary to continue the constant-speed drive. That is, at the time of the constant-speed drive, the switch 30 is switched from a minimum value operator 25 to the generator to eliminate a function of a voltage limiter pattern generator 23 and to preferentially output the current Ipm necessary to continue the constant-speed drive as a current pattern. Thus, the constant-speed drive can be continued irrespective of a voltage of a trolley wire, a voltage of a filter capacitor. |
