Robert Bosch

Seg Automotive Germany Gmbh

Hoffmann & Co Elektrokohle Ag

Michael Bayer

Sven Hartmann

Dirk Buehler

Walter Gerschwitz

Gerhard Bachauer

Thomas Faber

Hans Hoell

The invention relates to an electric machine, in particular a commutator machine (), the carbon brushes () of which cooperate with a commutator () to supply the rotor with current, the carbon brushes () being continuously provided or provided in layer sections with different additives such as scouring material, lubricants or similar. To achieve a longer service life for the carbon brushes (), a maximum of half, preferably less than half of all the carbon brushes () of the machine have a significant fraction of an additive, said fraction differing from that of the other carbon brushes ().

Electric machine, in particular commutator machine

An electric drive machine having a stator and a rotor, the rotor carrying a rotor winding, in slots, which is able to be supplied with electric current by a power supply system made up of a commutator and sliding contacts, the sliding contacts pressing on the surface of the commutator having at least two pairs each made up of one positive sliding contact and one negative sliding contact, and in the case of at least one first pair of a positive sliding contact and a negative sliding contact, the positive sliding contact and the negative sliding contact being opposed at an angle &#x3b3;, which deviates from 180&#xb0;.

Electrical drive machine having a stator and a rotor

An electric machine has at least two pairs of carbon brushes made up of one plus and one minus carbon brush, which interact with a commutator in order to supply current to the rotor, the carbon brushes being mounted with their brush holder on a brush plate via a mount, and the mounts on the brush plate lying across from each other at 180&#xb0;. The holding part on at least one brush holder is offset from the center, in particular from the axis of symmetry of the brush holder, by an angle relative to the rotor axis so as to realize an asymmetrical placement of the carbon brush, the holding part on the other brush holders being disposed on their axes of symmetry.

Electric machine having at least two pairs of carbon brushes

A multilayer brush, which essentially contains a composite having a graphite component and having a copper component, and a layered structure, a first layer being furnished with a high copper component and a further layer being furnished with a comparatively low copper component. It is provided that the copper component of the first layer in comparison with the copper component of the second layer corresponds to a ratio of &#x2266;3/2.

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Ludwigsburg, Germany

Michael Bayer