| 摘要 |
PURPOSE:To prevent an electric railcar from reskidding by reducing a limited current value by the fact that even one shaft skids at the regenerative time, holding the limited current value to the prescribed value when all the shafts slides to reduce the output voltage of an inverter. CONSTITUTION:When one shaft starts skidding at a time t1 after an inverter starts, a limited current value IB starts gradually decreasing. When the rail condition is adverse at this time, the skidding expands, and the all shafts skid. If the all shafts start skidding at a time t2, the current value IB is held at the value at that time. Simultaneously, the inverter output voltage V carried in the constant V/F pattern starts gradually decreasing. When the all shafts finish skidding at a time t3, the inverter output voltage V is held constantly until coinciding with the constant V/F pattern, and the value IB again decreases. When the skidding finishes at a time t5, the value IB gradually returns. |
