| 摘要 |
<p>PURPOSE:To enable to rapidly start an electric railcar from the state of stopping time and zigzag time irrespective of the route state by setting the slip frequency from the start to an ordinary reference slip frequency. CONSTITUTION:When an inverter start command signal 10 is inputted, a switch 4 is shifted from ''0'' side to ''1'' side. Thus, the value FXP produced by adding a reference slip frequency to the rotating frequency of an induction motor is outputted as an inverter frequency 18. When the inverter is started, the output V of the inverter is raised from 0 voltage to the value corresponding to the inverter frequency FXP at that time. If the induction motor current value IM becomes equal to the current limit value IP of the target current value of the induction motor, the output of a comparator 3 becomes ''1'', a constant current control 20 is started, and further shifted to V/F constant pattern operation.</p> |
