ELECTRIC MACHINE WITH SPECIAL CONTACT BRUSH GEOMETRY

Proposed is an electric machine (30) which comprises a rotor (32), a commutator (20) having a contact surface (22) and a contact brush (12, 2a, 12b) having a running surface (10). The running surface (10) faces and is in electrical contact with the contact surface (22). In this way, the running surface (10) comprises at least one longitudinal recess (14) in a sub-region. The running surface is characterised in that the longitudinal recess (14) comprises a triangular cross-section. As a result, the recess (14) can be made in a transverse direction in a relatively narrow and precise manner, so that contact paths (34) of contact brushes (12, 12a, 12b) of different electric polarity can be substantially congruent and a degradation with different strengths of the electric contracts can be avoided. 本发明提出种电机(30)，所述电机具有转子(32)、换向器(20)和接触电刷(12，12a，12b)，所述换向器具有接触面(22)，所述接触电刷具有运转面(10)。所述运转面(10)朝向所述接触面(22)并且与所述接触面处于电接触中。在此，所述运转面(10)至少在部分区域中具有长形的凹部(14)。所述电机的特征在于，所述长形的凹部(14)具有三角形横截面。由此，可以相对狭长地且精确地沿横向方向制造所述凹部(14)，从而不同电极化的接触电