Device for controlling the wear of commutator carbon brushes

摘要

For monitoring the degree of wear of commutator carbon brushes (13) of a direct current electric motor in a akkumulatorbetriebenen electric vehicle, the commutator carbon brushes (13) bear electrically insulated control brush (15) of an optical and / or acoustic warning signal transmitter (23, 25). The control brush (15) set at a predetermined degree of wear of commutator carbon brushes (13) to the commutator (11) and thereby turn the warning signal transmitter (23, 25). The control brushes (15) are connected to a the warning signal transmitter (23, 25) controlling electric storage stage (19) and set the storage stage (19) in contact with the commutator. The memory stage set (19) turns on the warning signal transmitter (23, 25) independent of the control Aufsetzzustand brush (15). At startup of the electric vehicle by switching on of its main switch (7), a timer (27) is triggered, which for the duration of its time constant the warning signal transmitter (23, 25) turns to control its functioning and resets the storage stage (19) beyond.