FIELD: electrical engineering; electric circuits for current collectors. SUBSTANCE: electric circuit of current collector has two first and second parallel- interconnected thermal resistors and ac voltage supply, as well as fan- cooled DC motor coupled with one of resistors through rectifier circuit; the latter has only two oppositely interconnected rectifiers, one of connecting points of fan-cooled DC motor being connected to point of connection of rectifiers and resistor or thermal resistor is connected to other point of connection of fan-cooled DC motor. EFFECT: reduced cost, simplified layout of components. 8 cl, 3 dwg
