VEHICLE Russian patent published in 1997 - IPC

FIELD: mining industry; self-propelled vehicles. SUBSTANCE: vehicle with traction ac motor is supplied alternately from external supply source and vehicle-mounted ac supply source. Contact system is used as external supply source. Generator can be used as vehicle mounted supply source, generator being mechanically coupled with internal combustion engine. When changing over supply from external to vehicle supply source, the latter is activated, its amplitude, frequency and phase are synchronized with those of external supply source and only after that traction motor is switched over for supply from vehicle mounted source. Change-over of supply is provided by means of programmable selection controller coupled by control circuits with supply change-over unit. Speed controller is provided in traction motor supply circuit made for control of alternating current frequency. EFFECT: enlarged operating capabilities. 20 cl, 4 dwg