A method for manufacture of a gold-plated slipring contact, comprising steps of galvanic deposition of a copper layer on the electrically-conductive substrate; of a nickel and/or nickel phosphor layer on the copper layer; and of a gold layer on the nickel and/or nickel phosphor layer. While galvanically applying the copper layer on the substrate, the used galvanic bath explicitly does not include at least one of 3-carboxy-1-(phenylmethyl)pyridinium chloride sodium salt, cationic polymers with urea groups, 1-(3-sulfopropyl)pyridinium betaine, 1-(2-hydroxy-3-sulfopropyl)-pyridinium betaine, propargyl(3-sulfopropyl)ether sodium salt, sodium saccharin, sodium allylsulfonate, N,N-dimethyl-N-(3-cocoamidopropyl)-N-(2-hydroxy-3-sulfopropyl)ammonium betaine, polyamines, 1H-imidazole-polymer with (chloromethyl)oxiran, 3-carboxy-1-(phenylmethyl)pyridinium chloride sodium salt, 1-benzyl-3-sodium carboxy-pyridinium chloride, arsenic trioxide, potassium antimony tartrate, potassium tellurate, alkali arsenite, potassium tellerite, potassium seleno cyanate, alkali antimonyl tartrate, sodium selenite, thallium sulfate, and carbon disulfide, to create the outer surface of the contact that is at least an order of magnitude rougher than a surface of a conventionally-fabricated contact.

An electric machine comprising a rotor having a rotor shaft and a brush module having a brush holder with at least one brush for energizing the rotor, wherein the brush module comprises a shaft journal which can be coupled reversibly mechanically to the rotor shaft of the electric machine and against which the brush lies.

An electric machine comprising a rotor having a rotor shaft and a brush module having a brush holder with at least one brush for energizing the rotor, wherein the brush module comprises a shaft journal which can be coupled reversibly mechanically to the rotor shaft of the electric machine and against which the brush lies.

A method for manufacturing a rotor for a slip ring motor, including the steps of: a) arranging a plurality of electric cables inside a hollow shaft, wherein the electric cables are distributed over an inner circumference of the hollow shaft, b) filling a resin into an empty space defined between the hollow shaft and the electric cables, c) arranging a rod inside the hollow shaft thereby displacing the resin into an annular gap between the rod and the hollow shaft, wherein the electric cables are arranged in the annular gap, and d) curing of the resin to form the rotor.

A method for manufacturing a rotor for a slip ring motor, including the steps of: a) arranging a plurality of electric cables inside a hollow shaft, wherein the electric cables are distributed over an inner circumference of the hollow shaft, b) filling a resin into an empty space defined between the hollow shaft and the electric cables, c) arranging a rod inside the hollow shaft thereby displacing the resin into an annular gap between the rod and the hollow shaft, wherein the electric cables are arranged in the annular gap, and d) curing of the resin to form the rotor.

A gas cooled electric rotating machine is provided in which a cooling gas is flowed through into a rotor and a stator. The rotor includes a pair of center hole conductors inserted into a center hole along a center of rotation while being electrically insulated from a shaft and from each other, the center hole conductors including respective protruding parts protruding toward an end of the shaft. The rotor includes a pair of end conductors provided at the end of the shaft so as to be each electrically insulated from the shaft, the end conductors being electrically connected to side surfaces of the protruding parts of the pair of center hole conductors, the side surfaces serving as electric connection surfaces.

A gas cooled electric rotating machine is provided in which a cooling gas is flowed through into a rotor and a stator. The rotor includes a pair of center hole conductors inserted into a center hole along a center of rotation while being electrically insulated from a shaft and from each other, the center hole conductors including respective protruding parts protruding toward an end of the shaft. The rotor includes a pair of end conductors provided at the end of the shaft so as to be each electrically insulated from the shaft, the end conductors being electrically connected to side surfaces of the protruding parts of the pair of center hole conductors, the side surfaces serving as electric connection surfaces.

An electrical connector is provided for electrically connecting a rotor of an electric generator to a slip ring and includes: a first support cartridge, the first support cartridge being electrically isolated, at least a second support cartridge distanced from the first support cartridge along a longitudinal axis of the electrical connector, the second support cartridge being electrically isolated, at least one conductive bar extending along the longitudinal axis, the conductive bar being fixed to the first support cartridge and the second support cartridge, and a winding connector for electrically connecting the at least one conductive bar to a rotor winding of the rotor.

An electrical connector is provided for electrically connecting a rotor of an electric generator to a slip ring and includes: a first support cartridge, the first support cartridge being electrically isolated, at least a second support cartridge distanced from the first support cartridge along a longitudinal axis of the electrical connector, the second support cartridge being electrically isolated, at least one conductive bar extending along the longitudinal axis, the conductive bar being fixed to the first support cartridge and the second support cartridge, and a winding connector for electrically connecting the at least one conductive bar to a rotor winding of the rotor.

A rotor of an electric machine, in particular of a claw pole machine, has a slip ring arrangement with two slip rings which are arranged on the rotor shaft, the slip rings being placed onto an insulating sleeve which is of electrically insulating configuration and is seated directly on the rotor shaft, the insulating sleeve (59) having a thermal conductivity of at least 2 W/mK.