A brush device (1) for electrically connecting a first element (2A) to a second element (2B) that can rotate relative to the first element (2A) about a rotational axis (L). In order to make electrical contact with the second element (2B), in a contact area (1A), the brush device (1) has a structure (1 B, 11B′, 1B″) that extends helically relative to the rotational axis (L). An E-machine (2) has a brush device (1) of this type, and a drive device has such an E-machine (2) for electrically driving a motor vehicle.

An electric motor, in particular a separately excited synchronous motor, comprises a rotor shaft with at least one slip ring and at least one electrically conductive contact element, in particular a carbon brush, which bears against the slip ring and is accommodated in a channel-like guide formed in a housing and extending radially with respect to the rotor shaft and which carbon brush is radially tensioned against the slip ring by means of a spring element, wherein a roller is provided which is tensioned laterally against the contact element via a further spring element and via which the contact element is tensioned against a wall of the guide.

An electric motor, in particular a separately excited synchronous motor, comprises a rotor shaft with at least one slip ring and at least one electrically conductive contact element, in particular a carbon brush, which bears against the slip ring and is accommodated in a channel-like guide formed in a housing and extending radially with respect to the rotor shaft and which carbon brush is radially tensioned against the slip ring by means of a spring element, wherein a roller is provided which is tensioned laterally against the contact element via a further spring element and via which the contact element is tensioned against a wall of the guide.

An electric motor has a commutator and at least one brush with a concavely curved brush surface as a running surface for the commutator. The brush has two parallel running in ribs, which protrude perpendicularly above the brush surface. The running in ribs each have a radius of curvature which is greater than a radius of curvature of a convex commutator surface. The running in ribs are arranged eccentrically and at a spacing from one another such that they are offset with respect to two opposing surface outer edges of the brush surface. The running in ribs are arranged such that they are inclined at an angle of inclination with respect to the surface outer edges.

An electric motor has a commutator and at least one brush with a concavely curved brush surface as a running surface for the commutator. The brush has two parallel running in ribs, which protrude perpendicularly above the brush surface. The running in ribs each have a radius of curvature which is greater than a radius of curvature of a convex commutator surface. The running in ribs are arranged eccentrically and at a spacing from one another such that they are offset with respect to two opposing surface outer edges of the brush surface. The running in ribs are arranged such that they are inclined at an angle of inclination with respect to the surface outer edges.

The metal graphite grounding brush including silver is made in slide contact with a peripheral surface of an axle and grounds the axle. The mass ratio between silver and carbonaceous components including a volatile component in the brush is silver above 30% and up to 90% and carbonaceous components less than 70% and down to 10%. When the total of silver and carbonaceous components is made 100%, the volatile component is down to 2.0% and up to 15%. The brush grounds the axle reliably so that noise from a car radio is reduced and has a long service life and mechanical strength.

Provided is a brush assembly for transferring lightning current between a first structure and a second structure, which brush assembly includes a holder realized for mounting to one of the two structures; a recess formed in the holder, which recess is shaped to accommodate a brush and to expose a first brush face; and a first displacement means arranged to move the first exposed brush face against a surface of the first structure; and wherein the recess is shaped to also expose a second brush face, and the brush assembly further includes a second displacement means arranged to move the second exposed brush face against a surface of the second structure. Further provided is a lightning protection circuit of a wind turbine; and a wind turbine.

A brush holder for slipring brushes comprises a brush mount held by a lever at a base. The lever is connected by a base pivot to the base and is pivotable in a plane orthogonal to a brush mount pivot axis and/or to a slipring rotation axis. A spring is provided between the base and the lever. The brush mount is connected to the lever by a brush mount pivot pivotable in said plane. The brush mount holds a first brush and a second brush wherein the brush mount pivot is between the first brush and the second brush.

A method for manufacturing a slipring module comprising a plurality of sliding tracks and an insulating body. The method includes: making a monolithic sliding track component preferably by a 3D printing process. The monolithic sliding track component comprises a plurality of sliding tracks, multiple connector for electrically connecting the sliding tracks, and at least one strut for mechanically interconnecting the sliding tracks and the connector to form a monolithic sliding track component; inserting the monolithic sliding track component into a mold; filling the mold with an insulating material such as a plastic material, and curing the plastic material; removing the molded product forming a slipring module from the mold, and removing the at least one strut from the slipring module.

A method for manufacturing a slipring module comprising a plurality of sliding tracks and an insulating body. The method includes: making a monolithic sliding track component preferably by a 3D printing process. The monolithic sliding track component comprises a plurality of sliding tracks, multiple connector for electrically connecting the sliding tracks, and at least one strut for mechanically interconnecting the sliding tracks and the connector to form a monolithic sliding track component; inserting the monolithic sliding track component into a mold; filling the mold with an insulating material such as a plastic material, and curing the plastic material; removing the molded product forming a slipring module from the mold, and removing the at least one strut from the slipring module.