| 摘要 |
1. A drive and/or brake control system for electrically driven vehicles, in particular trams or trolley busses, wherein a series-wound d.c. motor (5) has series connected impedances (4) which can be switched in stages for starting and/or braking, and wherein a.d.c. - chopper regulator (17) is arranged in parallel with the series-wound field winding (6) and a regulating device (18) is arranged in such manner that during operation at any of the individual impedance stages and during switching between the stages, the excitation current flowing in the series field winding (6) changes in opposite manner to the armature current, the drive and/or brake momentum being maintained so as to be constant in accordance with a required theoretical value, characterized in that the d.c. - chopper regulator (17) and associated resistors (15, 16) are connected in parallel to the series field winding (6) and during switching to a lower impedance stage, the d.c. - chopper regulator (17) is switched so as to be fully conductive before switching the step contactor, in order to reduce the magnetic flux, with an advance that approximately corresponds to the switching time of the contactor in such manner that the residual transient peaks are virtually symmetrical (Fig. 1, 3).
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