Abstract: A rotor for an electrical machine has at least one groove, the at least one groove includes a groove bottom and groove walls. A separating element is provided between the groove walls, and extends along the groove. The separating element is arranged on the groove bottom, at least in sections, such that groove chambers are formed along the groove.

Abstract: A method of producing a solderable aluminum contact comprises formulating an ink, applying the ink to an aluminum substrate to form an ink layer on a surface of the aluminum substrate, and melting the ink layer. The ink includes a solderable element that is conductive. The melting of the ink layer forms an alloy on the surface of the aluminum substrate including the solderable element.

Abstract: Provided is a rotor of a brushed motor capable of reducing the occurrence of contamination during press-fitting of a commutator onto a knurling and reducing defect factors due to rotor contamination to improve productivity. In a rotor of a brushed motor having a commutator press-fitted onto a knurling of a shaft, an inclined surface is provided on an inner circumferential side of the commutator, and an angle of the inclined surface is configured to be smaller than an angle of an axial end portion of the knurling. The knurling may be configured to be at a position different from a shaft stepped end surface of the shaft and the knurling may be configured to be positioned axially inward of the commutator from an end surface of the commutator.

Abstract: Disclosed herein is a switched reluctance motor including: a shaft rotatably supporting the switched reluctance motor in an axial direction; a cylindrical part provided at a central portion of the shaft and movable vertically; an elastic member formed to enclose the shaft, formed from an upper portion of the shaft to an upper portion of the cylindrical part to thereby support a rise of the cylindrical part, and having elasticity; commutator segments attached to an outer peripheral surface of the cylindrical part and having a cylindrical shape; brushes contacting or not contacting the commutator segments according to vertical movement of the cylindrical part; and a propeller provided on a lower portion of the cylindrical part and pushing air at the time of rotation to thereby move the cylindrical part upwardly.

Abstract: A carbon commutator, for an electric motor, has a plurality of segments forming a brush contact surface and a hub supporting the segments. Each segment has a connector having a terminal for connection of a lead wire, a carbon layer forming the brush contact surface, and a connecting layer fixed to the carbon layer and electrically connecting the carbon layer to the connector. A plurality of micro structures is formed at the interface between the connecting layer and the carbon layer.

Abstract: An electric machine and a method of forming a commutator for an electric machine includes forming a commutator assembly including a plurality of commutator bar members linked through a corresponding plurality of bridge elements, rolling the commutator assembly into a commutator form having a substantially continuous, uninterrupted, outer surface, introducing an internal support member that receives an end portion of each of the plurality of commutator bar members into an inner diameter of the commutator form, and separating the plurality of commutator bar members by removing each of the plurality of bridge elements creating a discontinuous outer surface.

Abstract: DC commutator motor that prevents variation in characteristics of the motor and suppressing deterioration of performance, and reduces the number of assembly steps. A magnet is attached to an inner circumferential surface of a bottomed cylindrical bracket to form a field pole. In an armature, a commutator is fastened to an armature core which is formed by laminating a plurality of thin core sheets. Shaft is inserted into the integrated body of the armature core with the commutator. Armature coil is wound within slots provided in the armature core, and bearings are attached. The armature is assembled with the field pole. Polygonal protruding portion which is made of resin is provided in the commutator, the protruding portion fastened to inner circumferential surfaces of the slots of the armature core, and the shaft is then inserted.

Abstract: A commutator (10, 40, 54, 60, 64, 70, 76, 78) for a brush motor includes a cylindrical insulating base (12), a plurality of segments (14) disposed on an outer surface (68) of the insulating base (12), circumferentially spaced from each other, and defining a plurality slots (42) between adjacent segments (14), and a plurality of insulating outgas elements (24) capable of releasing a gas having a lower conductivity than air and disposed on the outer surface (68) of the cylindrical insulating base (12). Each outgas element (24) is located between a corresponding pair of the plurality of segments (14), having a gas releasing surface (26) between the corresponding pair of segments (14) and lower than outer surfaces (28) of the corresponding pair of segments (14). A method for making a commutator is also provided.

Abstract: In a method for producing a commutator ring for a commutator of an electric machine, the lamellae of a commutator ring are formed of an electrically conductive, deformable band material, and they have at least one recess running in the longitudinal direction of the band material, before a desired number of the formed lamellae are closed to form the commutator ring. After the closing of the lamellae to form the commutator ring, a reinforcing ring made of an electrically nonconductive, deformation-resistant material is introduced into the recess and is fixed in the recess by plastic deformation of the lamellae of the commutator ring.

Abstract: A method of force-fitting a commutator (3) onto the shaft (2) of a rotor. This force-fitting is over an externally knurled part (6) of one end (4) of the shaft. The force-fitting is performed in such a way that the externally knurled part remains located on the outside of a first portion (A) of the commutator supporting the slip rings (8). According to another feature, an internally knurled part (9) of the commutator, situated essentially on the outside of the first portion (A), is force-fitted over an externally plain part (7) of the end of the shaft. The method has the notable advantage of allowing longer brush life. The method is particularly well suited to applications to a motor vehicle alternator or alternator-starter.

Abstract: A vibration motor includes: a core pivotally supported on a shaft; a commutator for supplying electric current to a coil; a commutator holder having through holes extending in an axial direction of the shaft; and chip type varistors fitted into the through holes. The commutator is provided with conductors extending in the axial direction of the shaft, and the conductors are inserted into the through holes and press-fixed to end electrodes of the chip type varistors. A first protrusion is provided on a first wall surface forming each through hole, and a second protrusion facing the first protrusion is provided on a second wall surface.

Abstract: Provided is an automotive alternator having structure for preventing entry and discharging of foreign matters irrespective of a posture of a brush unit, to thereby allow normalization of the brush unit. The brush unit of the automotive alternator includes a slip ring, a brush, a brush holder, and a slip ring cover coaxially spaced from the slip ring and having an inner peripheral surface surrounding substantially an entire periphery of the slip ring. The inner peripheral surface of the slip ring cover has a tapered surface increasing in diameter from a first end on the frame side toward a second end having a fully-open opening. The fully-open opening is sealed by a sealing member that forms a labyrinth seal with the second end.

Abstract: The invention relates to a commutator with contact segments, arranged at a distance from each other and forming a brush running surface. Each contact segment is soldered to a securing portion of a metal segment support piece. The commutator has a hub body made from an electrically insulating material which supports the segment support pieces which are each provided with a winding connector hook. According to the invention, at least one solder barrier recess is provided in the upper side of the securing portion facing the contact segment and/or in the under side of the contact segment facing the securing portion.

Abstract: The mold commutator of the present invention comprises a plurality of commutator segments made of copper or copper alloy and circumferentially arranged, a plurality of spark absorbing elements, disposed between adjacent commutator segments, with paired parallel surfaces respectively having electrodes thereon, and a resin mold portion which integrates these portions into one piece. The spark absorbing element is electrically connected to the commutator segment via the electrode, and spark voltage generated at the commutator segment is absorbed by current flowing between the electrodes.

Abstract: A commutator 10 comprises an electrically non-conductive base 12; and a plurality of electrically conducting segments 16 supported by the base 12. Each segment 16 comprising a first electrically conductive inner layer 18 provided on the base 12, and a second electrically conductive outer layer 20 fixed to the inner layer 18. The inner and outer layers 18, 20 have opposing surfaces 21, 22 which abut each other, once the commutator is assembled. An opening, preferably being a recess 30, for receiving flux and/or air during the fixing of the outer layer to the inner layer is provided in at least one of the opposing surfaces 21, 22. There is also provided a DC electric motor which includes such a commutator 10.

Abstract: A slip ring module (76) for a rotor (40) of an electrical machine (10), in particular, an alternator is disclosed, comprising at least one first slip ring (79) with at least one first connecting conductor (103) held in sections of an insulation material (101) for the slip ring module (76), in electrically conducting connection with at least one first slip ring (79) and with an end (115) of the connection conductor (103), facing away from the first slip ring (79), provided for connection to an excitation coil (61). The invention is characterised in that the slip ring module (76) has a further formed conductor (139) forming a direct electrical connection from the first connection conductor (103) to a surface (142) of the slip ring module (76). An electric machine is also provided, in particular, an alternator for motor vehicles, comprising a rotor (40), supporting an excitation coil (61), said slip ring module (76) providing the power supply to the excitation coil (61).

Abstract: An armature for an electric motor has a lamination stack on a shaft with a commutator mounted on one end of the shaft. Magnet wires wound in slots in the lamination stack, the commutator and armature shaft are at least partially encapsulated in thermoset. The commutator has a commutator ring divided into a plurality of segments with slots between the segments that are filled with a second plastic when the commutator is made by molding a core of the second plastic, such as phenolic, in the commutator ring before the commutator ring is mounted on the armature shaft. Prior to molding the thermoset, the commutator ring is sealed. The seal prevents the thermoset from flowing into the slots between the commutator ring segments or over the commutator ring.

Abstract: A brushless slip ring has a first conductive rotating member, and a second conductive non-rotating member that is positioned a predetermined distance away from the first conductive rotating member. A conductive semi-solid material electrically couples the first conductive rotating member to the second conductive non-rotating member. The semi-solid material is configured to transfer electric current from the rotating member to the non-rotating member.

Abstract: A method is disclosed for producing a pole face of a metal closing elements of a solenoid, especially for electromechanical switchgear. In at least one embodiment, the method includes machining the surface of a crude stamped part of the closing element to give the pole face. A corresponding armature, yoke, solenoid and switchgear are also disclosed.

Abstract: An electric rotary machine which may be employed as a dc motor in an automotive engine starter. The motor includes an armature equipped with an armature shaft, a commutator, brushes, and a bearing retaining an end of the armature shaft. The surface of the commutator has a plurality of protrusions extending in parallel to each other in a direction of rotation of the commutator. Each of the brushes has formed in the bottom thereof grooves in which the protrusions of the commutator are fit. The brushes are urged into constant engagement of the grooves with the protrusions on the commutator to establish electrical contacts between the brushes and the commutator and minimize movement of the armature shaft relative to the bearing.

Abstract: A method of forming a power tool includes forming and balancing an armature by securing a lamination stack having slots therein on an armature shaft securing a commutator on one end of the armature shaft, winding magnet wires in the slots in the lamination stack and securing ends of the magnet wires to the commutator, and molding plastic to at least partially encase the magnet wires in plastic and forming a balancing feature. Plastic is removed from the balancing feature during dynamic balancing of the armature. The armature is then disposed in a stator to form an electric motor and the electric motor is disposed in a power tool.

Abstract: The invention relates to a closed loop conductor blank for a drum commutator (T). The conductor segments are interconnected via bridge sections. One end face of the conductor segments comprises connecting projections (7) as well as inward-facing anchor ties for anchoring said conductor segments in a support element (1). The first anchor ties (9a, 9b), which are produced by the partial splitting of material on the radially inner surface of the strip in the vicinity of the conductor segments (4), form K-shaped pairs of anchor ties. In addition, second anchor ties (10a, 10b) are provided, said ties being C-shaped and arranged substantially on the end face and being produced by the inward deformation of anchoring projections arranged on the edges of the strip.

Abstract: A method of manufacturing a commutator main body which has a cylindrical insulating body, and a plurality of segments arranged in an outer circumference of the insulating body. A short-circuit member is arranged in an end in an axial direction of the insulating body. The short-circuit member has a plurality of first short-circuit pieces and a plurality of second short-circuit pieces. A tabular insulating portion covers first coupling portions of the first short-circuit pieces, and second coupling portions of the second short-circuit pieces. The insulating portion has a restriction recess, and the end in the axial direction has a restriction projection. The restriction projection is engaged with the restriction recess, whereby the movement of the short-circuit member in the circumferential direction with respect to the commutator main body is restricted. Accordingly, the assembly of the short-circuit member in the commutator main body is facilitated.

Abstract: A method of manufacturing a power tool includes forming an armature by placing an electrically insulative sleeve on an armature shaft, securing a lamination stack having slots therein on the armature shaft with the insulative sleeve disposed therebetween, securing a commutator on one end of the armature shaft with the insulative sleeve disposed therebetween, winding magnet wires in the slots in the lamination stack and securing ends of the magnet wires to the commutator, and molding thermally conductive plastic to at least partially encase the magnet wires in plastic. The armature is then disposed in a stator to form an electric motor and the electric motor is disposed in a power tool. In an aspect, electrically insulative plastic is molded in the slots of the lamination stack to form slot liners and around the ends of the lamination stack to form end spiders.

Abstract: A commutator (10) includes a core (12) having a generally annular periphery (15). A plurality of commutator bars (14) is provided in a spaced relation about the periphery of the core. At least two of the commutator bars have a width different from each other.

Abstract: An electric rotary machine which may be employed as a dc motor in an automotive engine starter. The motor includes an armature equipped with an armature shaft, a commutator, brushes, and a bearing retaining an end of the armature shaft. The surface of the commutator has a plurality of protrusions extending in parallel to each other in a direction of rotation of the commutator. Each of the brushes has formed in the bottom thereof grooves in which the protrusions of the commutator are fit. The brushes are urged into constant engagement of the grooves with the protrusions on the commutator to establish electrical contacts between the brushes and the commutator and minimize movement of the armature shaft relative to the bearing.

Abstract: An electromagnetic component is formed from a pre-form comprising layers of soft magnetic metal ribbon. Adhesive is applied to permeate the pre-form and is then cured. The bonded pre-form is placed within a milling assembly that supports and constrains the ribbon layers during a milling operation used to process the pre-form into an electromagnetic component shape. Optionally, the shape is thermally processed. The resulting electromechanical component has attractive soft magnetic properties, including low core loss, that render it useful as a component in electric motors and generators and static inductive devices operable at high excitation frequencies.

Abstract: A method for building a device having fluidic and electrical functions includes the steps of: mounting a building part with fluidic and electrical functions on a substrate that is provided with a fluidic circuit; fluidically connecting the building part with the substrate; electrically connecting the building part with the substrate; and mechanically connecting the building part with the substrate. Flip-chip technology is utilized and a seal is made by of a gasket. With such a method, a hybrid microfluidic system can be built in which materials and processes for realizing the various connections (fluidic and mechanical and electrical) can be selected in principle independently of each other so the individual processes can be optimized independently of each other in a large measure. With the application of flip-chip technology, great accuracy in the positioning of the building parts can be achieved.

Abstract: A method of making an armature includes placing a commutator and a lamination stack on an armature stack. Coil windings wound in slots in the lamination stack, the commutator and armature shaft are at least partially encapsulated in a first plastic. The commutator has a commutator ring divided into a plurality of segments with slots between the segments that are filled with a second plastic when the commutator is made by molding a core of the second plastic in the commutator ring before the commutator ring is mounted on the armature shaft. The mold used to mold the first plastic includes projections that extend between the tangs of the commutator and against notches at axial ends of the slots of the commutator. The notches filled with the second plastic and the projections of the mold prevent plastic flash from getting into the slots of the commutator ring.

Abstract: A method for manufacturing a stator of an electrical rotating machine that is configured to have a rotor mounted inside the stator. The stator has a laminated magnetic circuit having a stack of magnetic metal sheets disposed substantially parallel to a plane perpendicular to the axis of rotation of the rotor of the machine. The magnetic circuit has teeth that delimit longitudinally oriented slots. The method includes the step of installing electrically conductive wires in the slots and forming winding heads at the two axial ends of the magnetic circuit and installing this assembly on a vertical axis. The assembly is trapped between an outer sheath, forming part of the final motor, and a removable inner core substantially occupying a volume reserved for the rotor. The conductive wires in the slots are impregnated under vacuum with a slot-impregnating composition including a heat-setting resin and a filler, and the composition is polymerized.

Abstract: A method is provided for manufacturing a stator of an electrical rotating machine. The method includes: impregnating a first winding head with a first composition that includes a heat-setting resin and a filler of a first particle size; impregnating conductive wires in a slot region with a slot-impregnating composition that includes a heat-setting resin and another filler of a second particle size smaller than the first particle size of the filler of the first composition; and impregnating a second winding head with a composition that includes a heat-setting resin and a filler of a particle size larger than the second particle size.

Abstract: A brush board assembly for a DC or AC motor employs a spool-shaped frame unitarily formed of a mounting plate, a series of support members that extend axially and define the brush holders, and an outer support plate that is generally parallel to the mounting plate. This frame may be molded of a high strength, high temperature resin for heavy duty motor use. Brush hold down springs are mounted onto push-in carriers that fit into receptacles on the support members. Preferably, scroll or volute springs are employed, and a stop arm on the carrier allows the free end of the spring to be held out of the way for installation or brush change out.

Abstract: A commutator for an electrical machine, in particular for an electric motor for actuating drives in motor vehicles, has a commutator body that supports commutator laminations. To reduce the electromagnetic radiation, emitted into the environment as interfering radiation, that is engendered by spark development in the commutation operation, the commutator body is embodied as a hollow cylinder, and the commutator laminations are disposed on the inner jacket face of the commutator body.

Abstract: A rotary electric machine and a commutator for the rotary electric machine are disclosed wherein the commutator includes an insulating member carrying thereon a plurality of commutator segments each having a brush contact surface. Each commutator segment has an embedded portion formed with a tab tail, molded to the insulating member, and has a riser portion radially extending outward from the brush contact surface to be electrically connected to armature coils. The insulating member has a large diameter portion and an increased wall thickness portion, axially extending from the large diameter portion in a direction away from the riser portion, with a sum of axial wall thicknesses of the increased wall thickness portion and the large diameter portion lying in a value two times an axial wall thickness of the riser portion. The increased wall thickness portion is formed in a tapered shape.

Abstract: Magnet wires wound in slots in a lamination stack of a dynamoelectric machine are encapsulated, in whole or in part, with plastic. The plastic may be thermally conductive and have features molded therein that enhance heat transfer. The plastic may stiffen the armature and increase its critical speed. Characteristics of the plastic, its geometry and its distribution may be varied to adjust spinning inertia and resonant frequency of the armature. The magnet wires may be compressed into the slots, by application of iso-static pressure or by the pressure of the plastic being molded around them. Larger magnet wire can then be used which increases the power of the electric motor using the armature having the larger magnet wire. A two or three plate mold may be used to mold the plastic around the armature. Balancing features can be molded in place. The plastic can have a base polymer that is a blend of two or more polymers and various thermally conductive fillings.

Abstract: A commutator includes a generally cylindrical dielectric body and a plurality of commutator segments arranged along an outer peripheral surface of the dielectric body. Each commutator segment includes a ridge, which extends in a direction generally parallel to an axial direction of the commutator and radially inwardly projects into the dielectric body to secure the commutator segment relative to the dielectric body. Each ridge includes alternately arranged high projecting portions and low projecting portions. Each high projecting portion includes grooves, which are obliquely angled relative to the longitudinal direction of the ridge, and protrusions, each of which is bound with one of the grooves and protrudes in an imaginary plane generally perpendicular to the projecting direction of the ridge.

Abstract: A commutator for commutator motors has a glass carrier body (11), and a plurality of electrically conductive segments (16) which are arranged at an outer circumferential surface (15) of the carrier body (11).

Abstract: A commutator bar (10) includes a body and first and second anchors disposed in spaced relation with each anchor and coupled to a proximal end of the body. A free end of the first anchor (13) extends in a direction towards the proximal end H of the body, and a free end of the second anchor (12) extends in a direction towards a distal end (0) of the body. Third and fourth anchors (17) and (18), are disposed in spaced relation and each have one end coupled to a distal end of the body and a free end extending in a direction towards the proximal end of the body. Fifth and sixth anchors (15) and (16) each have one end coupled to the body at a location between the proximal and distal ends. A free end of the fifth anchor extends toward one side of the body and a free end of the sixth anchor extends toward the other side of body.

Abstract: A resin composition having high thermal conductivity and excellent moldability and a method of producing the same is provided. The composition includes 40 vol % or more of a matrix resin, 10 to 55 vol % of a thermally conductive filler dispersed in the matrix resin and the balance of a low-melting point alloy connecting the thermally conductive filler to each other and having a melting point not higher than 500° C. The proportion of the volume ratio of the low-melting point alloy to that of the thermally conductive filler is set in a range from 1/30 to 3/1.

Abstract: Magnet wires wound in slots in a lamination stack of a dynamoelectric machine are encapsulated, in whole or in part, with thermally conductive plastic. Pre-formed features having a thermal conductivity higher than the thermally conductive plastic are insert molded when the plastic is molded. The pre-formed features may include a finned end cap and a fan. Alternatively, end domes of the plastic over end coils of the wound magnet wires have a metallic layer on them, such as by being metallized. The end domes can be formed with features which are also metallized. The thermally conductive plastic can have a phase change additive in it. The magnet wires can have a layer of heat activated adhesive that is activated when the plastic is molded. Slots in the lamination stack can include slot liners formed of thermally conductive plastic. A fan can be formed when the thermally conductive plastic is molded to encapsulate the magnet wires.

Abstract: For the purpose of preventing resin from flowing into a commutator when resin molding a rotor, a rotor for a flat coreless motor comprises a printed wiring board, on one side of which a plurality of air-cored armature coils are provided, and on the other side of which a plurality of segment patterns constituting a commutator and a wiring pattern are provided. These members are molded with resin into a unitary body with the segment patterns exposed. Wiring pattern parts are provided so as to surround the outer periphery of the commutator.

Abstract: One current passing circuit board is constituted by one metal plate in which a continuous current passing pattern that is to be separated in a plurality of current passing patterns is formed, and molded resin in which the metal plate is inserted. The current passing circuit board is pressed to eliminate the unnecessary portions of the above mentioned current patterns, thereby the one current passing circuit board is formed in a state where the current passing pattern continuously formed is separated in the normal forms.

Abstract: A miniature PMDC motor has a wound rotor 15 comprising a rotor core 16 and a commutator 17 mounted on a shaft 14. A cooling fan 20 is directly mounted onto the commutator 17 by use of a mechanical snap-fit type connection. Projections 29 on the commutator mate with recesses in the fan 20 to prevent relative rotational movement and detents including resilient fingers 23 and projection surfaces 34 hold the fan axially.

Abstract: A plane commutator is comprised of a plurality of commutator segments, a plurality of base plate and a resinous boss member. The commutators are made of sintered carbon compound and disposed to provide a plane commutator surface at an end thereof and a base portion at the other end. Each commutator segment has a projection extending from the base portion. The resinous boss member is disposed in contact with the base portion. Each base plate has an engagement hole, to which one of the projections is fitted, and a terminal portion that extends along an outer periphery of the boss member. A powder-accommodation pocket is formed around a foot of each the projection so that the projection can be shaved by a corner edge of the hole. This ensures good contact of the commutators with the metal base plates and provides a sufficient manufacturing tolerance.

Abstract: A method for producing a flat commutator includes forming a metallic supporting body with segment supporting parts and forming a hub of an electrically insulating material. The supporting body is connected in an electrically conductive and mechanically fixed manner to an annular disc resistant in a reaction-promoting environment. The supporting body is divided into segment support parts. The annular disc is divided into annular segments. The surfaces of the metallic segment supporting parts which are bare as a result of the division of the supporting body are coated with a coating that is resistant to the environment. The coating is carried out by currentless deposition. The commutator produced according to this method has the hub adjacent to the supporting body in the vicinity of the division.

Abstract: A brush motor for an electric power steering system comprises a four-pole field portion 3, an armature 4 having windings 9 wound around a core 5 with 22 slots 8 to constitute a lap winding, hooks 12 which are formed on one ends of 22 commutator segments 10 respectively and on which the windings 9 are hooked, and a cylindrical commutator 7 constructed by molding integrally the commutator segments 10 with a resin, and four brushes 18 which contact slidably to outer peripheral surfaces of the commutator segments 10, wherein, when the commutator 7 to which a sliding contact portion of the brush 18 contacts is sectioned perpendicularly to an axial direction, a relationship of 0.18≦(A×N)/(D×D)≦0.23 is satisfied, where A is a sectional area of one commutator segment, N is a number of the commutator segments, and D is a diameter of outer peripheral surfaces of the commutator segments.

Abstract: A cylindrical commutator is provided with a plurality of segments arranged at equal intervals around an axis, each of which is provided with a groove on an inner surface thereof and one or more anchors extending from edges of the groove. The grooves and the anchors are extended over substantially the total length of the segments and respectively have end steps and end edges at ends near the hooks, or the anchors can be formed in pair and the pair of anchors are connected with each other at the ends near the hooks.

Abstract: A method for producing a flat commutator with a hub body formed from insulating molding compound, a plurality of conductor segments and an equally large number of carbon segments, the hub body being molded onto a conductor blank provided with radial grooves, which grooves are filled with molding compound. Then the composite part of conductor blank and hub body is machined on the end face of the conductor blank turned away from the hub body. An annular carbon disk is adhesively bonded to the machined end face of the composite part, whereby electrically conductive connections to the conductor blank or to the conductor segments produced therefrom are established. Finally the annular carbon disk is subdivided into carbon segments by cuts extending into the molding compound that fills the grooves. The conductor blank is then subdivided into conductor segments.

Abstract: The present invention is directed to an electrical slip ring assembly having a plurality of conductive rings held in place by multiple spaced apart comb-like structures advantageously eliminates the need for molding the conductive rings as part of the base or plating the conductive rings into completed bases. Further, the present invention eliminates the need to machine an annular base or perform expensive and time consuming operations to roll conductive strips into a machined base member.

Abstract: A plane commutator includes a plurality of commutator segments made of carbon compound, a resinous boss member and a plurality of metal base plates. The plurality of the commutator segments forms a disk-like commutator surface at an end thereof and a base portion at the other end. The resinous base member is disposed in contact with the base portion to support the plurality of commutator segments. Each commutator segment has a projection extending from the base portion, and each base plate has an expansible through hole fitted to the projection. Each projection includes metal powder at portion in contact with the through hole to provide good electrical connection.