Electrical drive machine having stator and rotor

Abstract

An electrical drive machine having a stator (35) and a rotor (38), wherein said rotor (38) carries a rotor winding (49) in grooves (46), which can be supplied with electrical current via a power supply system made of a commutator (52) and sliding contacts (58), wherein said sliding contacts (58), which press on a surface of said commutator (52), have at least two pairs made of one positive sliding contact (581) and one negative sliding contact (582) each, wherein said positive sliding contact (581) and said negative sliding contact (582) oppose one another at an angle which deviates by 180 DEG in at least a first pair of one positive sliding contact (581) and one negative sliding contact (582).

Description

technical field

[0001] The invention relates to a drive motor (electric motor for a starter) having a stator and a rotor, wherein the rotor can be supplied with current via a commutator and sliding contacts (brushes). Background technique

[0002] Such motors are widely used. In this case, the current for operating the drive motor is introduced into the rotor winding (armature winding) via one or more pairs of sliding contacts via a commutator. These sliding contacts are mostly made of sintered materials mainly containing graphite components. These sliding contacts and the commutator are subject to wear during operation. Starting devices are usually designed for short-time operation and are usually suitable for 30,000 to 60,000 switching cycles, that is, the starting process.

[0003] If higher loads and greater switching cycles are to be achieved, the slider must have an even load so that the maximum possible switching cycles can be achieved. At present, for systems wit...

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