A device {i.e., a slip-ring or a homopolar motor/generator) (40, 50, 80) is adapted to provide electrical contact between a stator and a rotor (41, 83), and includes: a current-carrying brush-spring (31, 84) mounted on the stator, and having two opposite surfaces; a fibrous brush assembly (35, 69) mounted on the conductor, the brush assembly having a bundle of fibers (36, 71) arranged such that the tips of the fibers will engage the rotor for transferring electrical current between the stator and rotor; a ribbon (33, 85) of superconducting material mounted on each opposite surface of the current-carrying brush-spring and communicating with the stator and the brush assembly; and another ribbon (29, 86) of superconducting material mounted on the rotor. The device is submerged in a cryogenic fluid at a temperature below the transition temperatures of the superconducting materials such that the electrical resistivity of the device will be reduced and the current-transfer capability of the device will be increased.

Provided is an electric connector, which is to be arranged between a connection terminal of a first device and a connection terminal of a second device, and is configured to electrically connect the connection terminal of the first device and the connection terminal of the second device to each other, the electric connector including: an elastic body having a plurality of through holes each being opened on a first surface and a second surface; and one or more carbon nanotube yarns joined to each of the through holes.

The invention includes a stator disposed inside a yoke, an armature supported inside the stator, a commutator connected to the armature and having a sliding surface in an outer peripheral portion, and a brush disposed opposing the commutator and having a sliding contact surface that comes into sliding contact with the sliding surface of the commutator, wherein the brush has a first member, and a second member with an electrical resistance value higher than that of the first member, the first member is disposed on an entrance side and the second member on an exit side with respect to a direction of rotation of the commutator, and the sliding contact surface of the brush is such that an inclined portion that inclines toward the entrance side with respect to the direction of rotation of the commutator is formed in the first member.

The invention includes a stator disposed inside a yoke, an armature supported inside the stator, a commutator connected to the armature and having a sliding surface in an outer peripheral portion, and a brush disposed opposing the commutator and having a sliding contact surface that comes into sliding contact with the sliding surface of the commutator, wherein the brush has a first member, and a second member with an electrical resistance value higher than that of the first member, the first member is disposed on an entrance side and the second member on an exit side with respect to a direction of rotation of the commutator, and the sliding contact surface of the brush is such that an inclined portion that inclines toward the entrance side with respect to the direction of rotation of the commutator is formed in the first member.

A method for making contact wires for sliprings comprising the steps of: coating and/or plating a wire with a first metal of the group of nickel, chrome or a combination thereof; coating and/or plating the wire with a second metal of the group of gold, silver, or a combination thereof; delivering laser radiation and generating an interference pattern of the laser radiation to the surface of the wire; heating the surface selectively as defined by the interference pattern, modifying of the crystal structure and/or providing protrusions and/or recesses due to melting and/or evaporation of the surface material.

A grounding brush assembly includes a grounding brush having a plurality of conductive fibers and a support including a mounting portion housing the conductive fibers and first and second lateral flanges extending from the mounting portion and fitting axially around the conductive fibers. A mounting plate is integral with the support and is provided with at least one radial portion extending radially outwardly relative to the mounting portion of the support. The free end of the radial portion of the mounting plate at least partially defines the outer diameter of the assembly.

A grounding brush assembly includes a brush having a plurality of conductive fibers and a support having a mounting portion housing conductive fibers and first and second lateral lips extending from the mounting portion and axially gripping the conductive fibers. The assembly includes a mounting plate connected with the support and provided with at least one radial portion extending radially outwardly from the mounting portion of the support. The mounting plate has an axial portion extending axially from the radial portion, at least partly radially surrounding the mounting portion of the support and being spaced radially apart radially from the mounting portion. Further, a retaining portion extends radially inwardly from the axial portion.

A grounding brush includes a wire extending along an arc, a plurality of conductive fibers each bent into a U-shape around the wire, and at least one support including a channel crimped about the fibers and wire to secure them to the channel. An assembly includes a mounting plate having an opening configured to surround a rotatable motor shaft having an axis of rotation, a plurality of tabs disposed in a circle around the periphery, each of the tabs extending axially from the first side of the mounting plate and radially toward the axis of rotation to define with an adjacent portion of the first side of the mounting plate a U-shaped bracket and a grounding brush mounted in the plurality of U-shaped brackets with the conductive fibers extending radially inward or outward. Also a method of mounting and adjusting the grounding brush in the assembly.

A wire brush for a slipring includes a contact section, from which a stabilizer arm is extending backwards towards the brush block of the slipring. The stabilizer arm holds a friction section, which is in friction contact with the contact section at a friction contact area. Such contact, in operation, generates internal friction within the brush when the brush is moved and, therefore, suppresses oscillations of the brush.

A wire brush for a slipring includes a contact section, from which a stabilizer arm is extending backwards towards the brush block of the slipring. The stabilizer arm holds a friction section, which is in friction contact with the contact section at a friction contact area. Such contact, in operation, generates internal friction within the brush when the brush is moved and, therefore, suppresses oscillations of the brush.