CONTROLLER FOR ELECTRIC ROLLING STOCK

摘要

PURPOSE:To obtain a small-size and inexpensive controller for an electric rolling stock by correcting a conduction rate when a conduction rate change ratio exceeds a predetermined value. CONSTITUTION:A current pattern generator 9 generates a current pattern IP equivalent to the torques generated from DC motors 1 and 2. A subtractor 10 outputs the difference between the pattern IP and a correction signal A as a correction current pattern IP'. A conduction rate calculator 11 calculates the conduction rate (r) of a chopper 7 on the basis of a motor current IM and the pattern IP'. On the other hand, a limiter 6A outputs the signal A by judging an idle or a slide when the change rate gamma of the conduction rate gamma detected by a differentiator 12 exceeds a predetermined value. Thus, a small-sized, inexpensive controller for an electric rolling stock can be obtained.