ELECTRIC MOTOR BRUSH WEAR INDICATOR

摘要

The invention relates to a an electric motor with a wound rotor (26). This type of rotor (26) requires the use of a collector (25) on the rotor (26) and brushes (21 to 24) on the stator (20) of the electric motor. According to the invention, the electric motor comprises means for recording (6, 29, 32) the reaching of a given wear limit (u) for the brush (21 to 24). In a preferred embodiment, the recording means comprise an insulated wire (6) embedded in the brush material (21 to 24). Once the wear on the brush (21 to 24) on contact with the collector (25) is sufficient, the wire insulation (6) is broken by the collector (25) and the wire conductor (6) comes into electrical contact with the collector (25), which permits detection of wear of the brush (21 to 24).