Abstract: In order to provide a high-safety step apparatus for a platform which is easy to be installed, eliminates a difference between the top of a platform and a train floor, and fills a gap between a train body and an edge of a platform, a step 1 is placed on the top of the platform 10, an arm is connected to the step pivotally in the horizontal direction, a cover 7 is placed over the step 1, and the step 1 is moved from the home position to the extended position.

Abstract: A main circuit of an electric vehicle using an induction motor is constituted by an invertor for producing three phase AC power having a variable frequency and a variable voltage and a three-phase induction motor supplied with the AC power by the invertor. The rotational speed of the induction motor is detected and a slip frequency signal is added (in power running) or subtracted (in regenerating running) to or from the rotational speed to control the output frequency of the invertor. On the other hand, the output voltage of the invertor is controlled to be in proportion to the output frequency thereof. The output voltage of the invertor is limited in accordance with notch positions of a master controller of the electric vehicle so as to be provided with a voltage notch stopping characteristic of the conventional electric vehicle.