Diagnostic device for diagnosis of commutator motor, has evaluation unit to determine current wear condition of one of brushes based on multiple high-frequency voltage peaks during operation of commutator motor

摘要

The diagnostic device (300) has a commutator (185) with a collector (183), which stays in sliding contact with associated brushes (187,197) on a collector sliding surface (189) and is connected with a motor coil (199) in an electrically conducting manner. An evaluation unit is provided to determine a current wear condition of one of the brushes based on the multiple high-frequency voltage peaks during the operation of a commutator motor (100). The evaluation is designed to determine up- and down commutation at the collector for one of the brushes based on high-frequency voltage peaks. An independent claim is included for a method for the diagnosis of a commutator motor.