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.

The invention relates to a commutator, comprising an insulating base and a plurality of commutator segments arranged on the insulating base, wherein each commutator segment comprises a metal layer, a transition layer and a graphite layer arranged on the base in sequence. The transition layer contains a material identical to that of the graphite layer and a material identical to that of the metal layer. The invention further relates to a motor comprising the commutator and a method for manufacturing the commutator. As the transition layer contains the material identical to that of the graphite layer and the metal layer, the problem that the graphite layer and the metal layer are cracked during high temperature sintering is resolved. The service life of the commutator is prolonged. The method for manufacturing the commutator reduces chemical contamination and production cost caused by electroplating and brazing used in a traditional technology.

A contact ring including a ring-shaped structure formed of an electrically conductive material. The ring-shaped structure has a plurality of projections on at least one side and a plurality of blades on at least one side. The projections and the blades penetrate an electrically insulating surface layer of each of a pair of contact elements and contact an electrically conductive material of each of the contact elements to electrically connect the contact elements.

An electrical rotating machine provides an integrated capacitive encoder for control of the stator field and enabling any of reduced size, reduced rotational inertia, and lower cost. The same structure may also support capacitive plates for capacitive power transfer to the rotor.

An electrical rotating machine provides an integrated capacitive encoder for control of the stator field and enabling any of reduced size, reduced rotational inertia, and lower cost. The same structure may also support capacitive plates for capacitive power transfer to the rotor.

A housing may include a first end that may define a first aperture. The stator may be disposed in the housing and include a bus bar that may extend towards the first aperture. The contact adapter may be fixed to the first end of the housing and may include a base member and a contact member. The base member may define a contact aperture and may include a body and a collar that may extend from the body. The body and the collar may define a pocket and the contact aperture may be disposed in the pocket. The contact member may include a first end, a second end, and a medial portion extending therebetween. The first end may extend from the body into the pocket and may contact the bus bar. The second end may extend from the base member and may be configured to contact an electrical connector.

A housing may include a first end that may define a first aperture. The stator may be disposed in the housing and include a bus bar that may extend towards the first aperture. The contact adapter may be fixed to the first end of the housing and may include a base member and a contact member. The base member may define a contact aperture and may include a body and a collar that may extend from the body. The body and the collar may define a pocket and the contact aperture may be disposed in the pocket. The contact member may include a first end, a second end, and a medial portion extending therebetween. The first end may extend from the body into the pocket and may contact the bus bar. The second end may extend from the base member and may be configured to contact an electrical connector.

A method for manufacturing a power distribution member includes preparing a solid wire with a circular cross-sectional shape, pressing to a portion of the solid wire in a pressing direction orthogonal to the solid wire to cause plastic deformation, thereby forming a pair of small curvature surfaces on an outer circumference of the solid wire on both sides in the pressing direction, the small curvature surfaces having a smaller curvature than an outer circumferential surface of the solid wire before the pressing and facing the pressing direction, preparing a terminal metal piece including a pair of facing walls facing each other and a coupling wall coupling between ends of the pair of facing walls, inserting the solid wire after the pressing between the pair of facing walls of the terminal metal piece in such a manner that one of the pair of small curvature surfaces faces one of the pair of facing walls and the other of the pair of small curvature surfaces faces the other of the pair of facing walls, and, after the inserting, crimping the pair of facing walls onto the solid wire.

A slip ring body for electrically contacting an asynchronous machine includes first and second slip rings rigidly connected to one another, with at least two conductor bars fastened to each of the slip rings. At least one of the slip rings has a recess for passage of the conductor bars of the other slip ring and defining around the recess a first region in which air is at least partially present and which has a magnetic conductivity that is lower than a magnetic conductivity in a second region in which the conductor bars to the one slip ring are fastened, or which second region is embodied for contacting with an energy-transmitting brush. The first and second regions are not made of copper. The recess defines an opening cross-sectional area which is greater than a cross-sectional area of the conductor bars fastened to the one slip ring.

An interconnection device for an electric machine, in particular for an electric machine for a motor vehicle, is provided for interconnecting shaped-bar ends of a winding, in particular of a stator winding. The interconnection device has an interconnection element, which has one or more openings for the insertion of at least one shaped-bar end, wherein the one or more openings each have an insertion section and a contact-making section adjoining the insertion section, which sections are designed such that the at least one shaped-bar end can be inserted into the insertion section and, in the case of a relative movement between the opening and the inserted shaped-bar end, the inserted shaped-bar end reaches the contact-making section and the spacing between the at least one shaped-bar end and a contact is reduced by way of being guiding through the contact-making section.