Abstract: In a commutator forming plate to be rounded into a cylinder which is to be cut at constant angular intervals to form a plurality of commutator segments after being filled with insulating material, a plurality of lands rising at given intervals on one surface of a plate is provided and a plurality of projecting portions protruding nearly perpendicular to a rising direction of each of the lands are formed simultaneously by forming a plurality of grooves crossing with each other on the respective lands and extending so as to intersect obliquely with respective outer peripheries of the lands.

Abstract: An object of the present invention is to provide a material for a sliding contact whose alloy composition does not contain an environmentally detrimental substance such as Cd, which exhibits excellent contact resistance, whose electrical functions are good and free of time-course variation, and which further exhibits excellent wear resistance. The material for a sliding contact assumes the form of an Ag—Zn—Pd, Ag—Zn—Pd—Cu, Ag—Zn—Pd—Ni, or Ag—Zn—Pd—Cu—Ni alloy. In the compositions of these alloys, the Zn content is 0.1-3.0% by weight, the Pd content is 0.1-1.5% by weight, and the balance is Ag. When Cu is contained, the Cu content is 0.1-3.0% by weight. When Ni is contained, the Ni content is 0.01-0.5% by weight. Zn, Pd, and Cu are present in the Ag &agr; phase in the form of solid solution. Ni particles are finely dispersed in the alloys. A composite clad material is formed through use of the material for a sliding contact.

Abstract: A flat coreless vibrator motor holds a rotor in a specific position by magnetic flux from a magnet, increasing vibration by increasing the eccentricity of the center of gravity of the rotor, easily moving since the adjacent segments of a commutator are not short-circuited, and having reduced manufacturing costs. In the flat coreless vibrator motor, a four-pole magnet which has alternate north and south poles for providing a magnetic field to an eccentric rotor faces the eccentric rotor, in one side of which at least one coreless coil is located and in which a commutator having four segments, each diametrically-opposite pair of which are short-circuited, is installed.

Abstract: Commutators for electro-dynamic machines such as electric motors comprise a cylindrical shell of insulated commutators bars, each of which has an outer layer with tangs extending from the outer layer and an inner layer with anchoring tabs extending therefrom. The commutating bars are typically produced from two strips of copper or other conductive metal. The inner layer may be formed of a thinner but stronger material, even of a non-conductive material, but is normally preferable to use two strips of copper to facilitate fusion of the materials together. The first strip, which is typically somewhat thicker than the second, is formed by punching so that partially formed tangs extend laterally from the side of the strip. The second strip is formed in a similar process to provide anchoring tabs extending from the sides of the second strip. These commutators can be produced economically and efficiently and can be adapted to a wide variety of applications and requirements.

Abstract: A commutator is composed of a contact unit, a base member made of insulation material and a terminal unit. The contact unit has a flat brush-contact surface and a connection surface opposite the brush contact surface. The contact unit also has a plurality of commutator segments. The terminal unit has a plurality of conductive terminal members. The base member supports the commutator segments. The commutator also has an electrical connection structure having a set of a convex member and a concave member and a plurality of connection members disposed between the convex member and the concave member to connect the plurality of the commutator segments and terminal members respectively.

Abstract: A commutation assembly mechanically commutates an electric motor. It includes a plurality of distinct electrical contacts forming a circular surface around a motor shaft. At least some of the electrical contacts are electrically coupled to distinct coils within the motor. The assembly further includes a conductive flexible ring and an arm with two rollers. The conductive flexible ring has a circumference that is less than the circumference of the circular surface. In use, the arm is rigidly attached to the motor shaft and has a roller disposed at a distal end for forcing an electrical connection between the flexible ring and specific electrical contacts during rotation of the arm. The electrical connection causes at least one of the distinct coils to be selectively energized.

Abstract: Addressed herein are commutators and methods of manufacturing them. The methods permit the carbonaceous material and core of a commutator to be molded simultaneously, rather than in a two-step process, and can eliminate one of two curing procedures used in connection with other manufacturing techniques. The necessity of machining the inner surface of the commutator shell to remove undesired excess phenolic or other material additionally is avoided by use of the techniques detailed herein. Commutators formed according to these methods may have increased useful lives and provide better performance than others presently available.

Abstract: A commutator motor comprises a yoke, a magnetic field portion secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having windings constructed by winding wire by a lap-winding method into slots formed on the outer circumferential surface of a core, a commutator including a resin portion and a plurality of segments held on an outer circumferential portion of the insulating resin portion with the spaces between adjacent segments being held by the insulating resin portion, a plurality of brushes contacting the surface of the commutator, and terminals electrically connecting segments which are to have the same electric potential.

Abstract: This invention relates to improvements in electric power systems for aircraft and, more particularly, to such systems which provide both starter and generator functions. The present invention has particular applicability to starter generators for helicopters having a body with an end bell, a commutator head assembly and a fan cover assembly, and wherein the starter generator does not have an end bell that permits air to exhaust through said end bell. The starter generator of the present invention has a commutator head assembly having a frame with a top end and a base end, the top end being adapted to fit within the fan cover assembly and be retained therein by a suitable means, the commutator head assembly having with a plurality of slots that are designed to exhaust air flow passing over one or more brushes in the starter generator.

Abstract: The carbon commutator of the present invention comprises a plurality of segments having ends which are sliding members on a brush and the other ends to which conductive terminal members are attached, wherein the segments are arranged in a circumferential direction on an insulating boss member and are insulated from each other, carbon layers being formed on the sliding member sides of the segments, metal layers being formed between the carbon layers and the conductive terminal members by sintering a first material of a principal component of the conductive terminal member with a second material which can alloy with the first material.

Abstract: The armature (26) has metal segments (42) separated from each other by grooves (46) distributed around its circumference on a front side thereof. Commutator covers (48) are placed on the segments (42) and soldered with the segments (42) in order to form the plane commutator (32). The commutator cover (48) has respective recesses (50) in its front side facing the metal segments, which correspond in their size and shape at least approximately to the segments (42). When the commutator cover (48) is assembled in the armature each segment (42) is inserted in a corresponding recess (50) of the commutator cover (48) and is soldered in the recess (50). Side surfaces of the segments (42) facing in the circumferential direction and edge surfaces pointing radially inwardly are covered by the commutator covers (48). The commutator covers (48) are positioned exactly by the metal segments (423) inserted in their recesses and are separated from each other by comparatively small slots (56) in the armature.

Abstract: An electric motor according to the principles of the present invention includes a stator or stationary part of the motor and an armature. The armature includes a shaft having a rotation axis and a commutator subassembly fixed symmetrically to the shaft that includes an insulating body surrounding the shaft and a plurality of circumferentially spaced, carbon-based material segments surrounding the shaft. The carbon segments are held to the body and each segment has a brush contacting surface. An equal plurality of metallic commutator members have at least a part located and molded within the corresponding carbon segment for providing good mechanical and electrical connection between the carbon segment and metallic commutator member and to isolate the metallic part within the carbon segment from harmful external environments such as described above.

Abstract: When winding an armature coil start S of a winding is entwined around a riser R1, the wire is wound via a riser R4 around a salient pole P1 adjacent to the riser R4 and an opposed salient pole P2 to the salient pole P1 in order, and leads from a riser R3 through an opposed riser R6 to an adjacent salient pole P3 and an opposed salient pole P4. Next, it is passed to a riser R5 and is wound around an opposed riser R2, an adjacent salient pole P5, and a salient pole P6, then ends with the riser R4. A varistor 18 is inserted and three electrodes 19 are soldered to the corresponding risers R2, R4, and R6.

Abstract: A direct current motor for use in a closed-loop control system is disclosed that includes a rotating commutator having a plurality of slots, a plurality of windings, the number of windings that conduct current corresponding to one less than the number of slots of the commutator, and a plurality of brushes that are configured so that application of a direct current voltage across the brushes results in a current flow in at least one of the windings which causes the commutator to rotate. Continuous application of the direct current voltage across the brushes causes the current to flow in a varying number of the current conducting windings as the commutator continues to rotate, the number periodically varying from all of the current conducting windings to the at least one current conducting winding.

Abstract: A direct current electromotor, having in particular small dimensions, comprising a collector plate arranged on a shaft, a plurality of collector wires held by the collector plate plate and accumulated to a collector sleeve, and comprising a capacitor disk also arranged in the area of the collector plate, the contact pads of the capacitor disk are each in electrical connection to at least one associated collector wire in a respective coordination. A direct current motor of this kind shall have a more simple structure so that very small diameters can also be produced. This is achieved in that the capacitor disk with its contact pads is directly set onto the collector wires and is connected therewith.

Abstract: A motor for an electric power steering assembly comprises permanent magnets constituting four or more poles secured to the inner wall of a yoke, a shaft disposed inside the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding composed of wiring wound by a lap winding method into slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of commutator segments secured to an end portion of the shaft, brushes disposed singly on the positive side and the negative side of the commutator so as to contact the surface thereof; and equalizing connectors connecting commutator segments which should have the same electric potential to each other.

Abstract: In a motor for driving a fuel pump, each contact part of a commutator which slidingly contacts brushes is made of a carbon material. The carbon material is a mixture of natural carbon and amorphous carbon so that the contact part has a longer durability. The weight percentage of the amorphous carbon to be mixed is in the range of 5-30, most preferably about 20. The brush may also be made of a mixture of natural carbon and amorphous carbon.

Abstract: In order to reduce the wear on the brushes (6) and thus extend the operating lives of the brushes and of the commutator motor, brush sparking on the trailing edges (6.2) of the brushes (6) is reduced a commutation magnetic field (M), produced for example by an additional magnet (4) placed axially behind the brushes (6), such that the magnetic field (M) deflects the moving charge carriers in the brushes (6), to thereby reduce the current density at the trailing edges (6.2) of the brushes (6).

Abstract: A reinforcement ring (10) for rotating bodies, for example commutators, comprises at least one metal ring (12) having a rectangular cross-section and a fiberglass ring (14) having a rectangular cross-section, the metal ring and the fiberglass ring both being connected at their end faces to form a unit.

Abstract: Projections 30 of a commutator unit 23 formed on the radial line of slit center positions of commutator piece 26 arranged radially are inserted into through holes 22 made on the center axes of salient poles 19 arranged radially in an armature core 15 and a rotator with high position accuracy of center points with respect to the salient poles 19 is formed. A projection tip face 30c is positioned on a shaft 14 to accurate predetermined dimension A from the rear end of the shaft, whereby accuracy of play gap D can be improved. The commutator unit 23 is reinforced with the projections 30 and wrong form dimensions made due to heat deformation at the soldering treatment time can be prevented.

Abstract: A power tool has an electric motor with a stator assembly and an armature rotatable within the stator assembly. A commutator is rotatable with the armature and is connected to the armature via a shaft. The commutator has an outer layer formed from a titanium graphite material. Brushes are associated with the commutator and are held in an end plate. The brushes are formed from a titanium graphite material.

Abstract: A dynamo-electric machine satisfies an expressionR.sub.eq .gtoreq.(.rho..sub.0 .multidot.(r1*.tau.)/(S/3))*(2.5)where .rho..sub.0 (.OMEGA..multidot.m) is the resistivity of armature coil, S (m.sup.2) is the cross-sectional area of the conductor portions thereof, r1 (m) is radius of rotation of the connecting portions between equalizers and armature circuits, namely the armature coil, risers, or commutator segments, .tau. (rad) is the pitch of pole pairs, and R.sub.eq (.OMEGA.) is the resistance value of the equalizer.

Abstract: In a starter having a motor yoke, a housing and an end frame forming a cylindrical starter frame, a cylindrical thermal insulation cover is fitted around the starter frame through rubber-made elastic rings. The rings are tightly fitted in V-shaped grooves formed circumferentially on fitting faces, one being between the housing and the yoke and the other being between the yoke and the end frame. Each ring is pressed radially inward by a large diameter part of the thermal insulation cover to fill in the V-shaped groove and contact the fitting face. Further, in a motor for the starter, a resilient plate sheet is disposed between a commutator and a brush holder to return a brush passing therethrough to the original position when the brush tends to move during sliding contact with the commutator.

Abstract: A commutator for a dynamo-electric machine according to the present invention comprises a cylindrical commutator main body provided with a plurality of commutator segments disposed around the circumference thereof, an equalizer assembly disposed inside the commutator main body provided with equalizer segments electrically connecting commutator segments which are to have the same electric potential, and an insulating resin portion disposed within the space inside the commutator main body integrating the commutator main body and the equalizer assembly.

Abstract: A dynamo-electric machine comprises an armature having a winding composed of a wire or wires wound by a lap winding method through slots extending in the axial direction formed on the outer circumferential surface of a core secured to a shaft, a commutator having commutator segments secured to the shaft, and an equalize disposed adjacent to the commutator in the direction of the axis of the commutator having terminals stacked in the axial direction which electrically connect commutator segments which should have the same electric potential.

Abstract: A direct current motor for use in a closed-loop control system is disclosed that includes a rotating commutator having a plurality of slots, a plurality of windings, the number of windings that conduct current corresponding to one less than the number of slots of the commutator, and a plurality of brushes that are configured so that application of a direct current voltage across the brushes results in a current flow in at least one of the windings which causes the commutator to rotate. Continuous application of the direct current voltage across the brushes causes the current to flow in a varying number of the current conducting windings as the commutator continues to rotate, the number periodically varying from all of the current conducting windings to the at least one current conducting winding.

Abstract: An electric rotating machine has an armature coil comprising outer and inner coil trunks disposed in slots of an armature core as well as outer and inner coil arms disposed along an axial side surface of the armature core. The outer coil arms are arranged to operate as a commutator and in slidable contact with brushes. The diameters of the radially outermost parts of the outer coil arms and the brushes are larger than that of the radially outermost surface of the outer conductor. This arrangement assures a larger commutator-brush contact area that reduces current density as well as heat generation in the commutator-brush contact area. As the radially outwardly extending parts of the outer coil arms are exposed to the surrounding air, the outer coil trunk, the outer coil arm and the brushes as well as the radially outwardly extending part are cooled effectively during rotation of the armature core.

Abstract: An electric motor in which polarities of a stator and the number of polarities thereof are converted by converting the polarity of current depending on a rotation position of a rotor made of a permanent magnet so as to enhance attraction and repulsion occurring between the rotor and the stator, so that a rotative force of the rotor can be achieved with minimum power.

Abstract: A flat commutator for an electric motor of a vehicle fuel pump. The commutator, is made with a one-piece carbon ring having a flat outer face, a one-piece conductor ring underlying the outer face of and embedded in the carbon ring, and a housing of a plastic insulating material molded on the rear face and the inner and outer edges of the carbon ring and adapted to mount the commutator on a motor armature. A plurality of circumferentially spaced apart grooves extend radially and axially completely through both the carbon ring and the conductor ring to provide a plurality of individual sintered carbon segments each with a separate conductor for electrically connecting the segments with armature coils.

Abstract: An electric motor according to the principles of the present invention includes a stator or stationary part of the motor and an armature. The armature includes a shaft having a rotation axis and a commutator subassembly fixed symmetrically to the shaft that includes an insulating body surrounding the shaft and a plurality of circumferentially spaced, carbon-based material segments surrounding the shaft. The carbon segments are held to the body and each segment has a brush contacting surface. An equal plurality of metallic commutator members have at least a part located and molded within the corresponding carbon segment for providing good mechanical and electrical connection between the carbon segment and metallic commutator member and to isolate the metallic part within the carbon segment from harmful external environments such as described above.

Abstract: A commutator is disclosed which is adapted to be mounted on a rotor shaft of an electric motor for cooperation with electrical contacts of the motor, the commutator being capable of accommodating two speeds of the motor. The commutator includes a support member formed of electrically insulating material and having a central opening for receiving the rotor shaft, the support member having a surface portion for attachment of commutator segments. A first plurality of circumferentially spaced, electrically conductive commutator segments are attached to the surface portion of the support member and are arranged in a generally circular array and wired to the armature to accommodate at least a first speed of the motor. A second plurality of circumferentially spaced, electrically conductive commutator segments are attached to the surface portion of the support member and are positioned radially outward of the first plurality of spaced commutator segments.

Abstract: A flat commutator for an electric motor of a vehicle fuel pump. The commutator, is made with a one-piece carbon ring having a flat outer face, a one-piece conductor ring underlying the outer face of and embedded in the carbon ring, and a housing of a plastic insulating material molded on the rear face and the inner and outer edges of the carbon ring and adapted to mount the commutator on a motor armature. A plurality of circumferentially spaced apart grooves extend radially and axially completely through both the carbon ring and the conductor ring to provide a plurality of individual sintered carbon segments each with a separate conductor for electrically connecting the segments with armature coils.

Abstract: In a plane carbon commutator which is formed by fixing a plurality of metal segments to a commutator main body made of a resin and by integrally fixing a carbon to each of these segments, engagement projections provided in the carbon are engaged with engagement holes provided in the segments for a mutually fixed integration. Accordingly, it is possible to effectively utilize the characteristics of the carbon which has been burned at a high temperature in advance.

Abstract: A compact design for the electronic circuits to provide electrical contact to a SED roll of a segmented electrode development unit is provided. In this invention, the required high voltage and low voltage circuitry is placed on a printed flexible circuit which is folded and rolled into a cylindrical circuit to be connected to the SED roll. The flexible printed circuit has a plurality of output terminals each of which will be connected to one of the electrodes of the SED roll and a plurality of input terminals each of which will be connected to a terminal of a slip ring to receive the required electrical power.

Abstract: The present invention refers to a dc motor, in particular a micro dc motor, comprising a shaft and a collector element arranged on said shaft and consisting of a collector plate and a collector which projects from said collector plate beyond the shaft end, the collector element being extended beyond the collector so as to form a shaft section on the side facing away from the collector plate, said shaft section being adapted to have attached thereto an additional component part. In accordance with a preferred embodiment, the dc motor is provided with an incremental angle-position encoder comprising an encoder element, the encoder element being fixedly attached to the collector element, which is extended so as to form a shaft section, and constituting the additional component part.

Abstract: A commutator system comprising a commutator and a commutator brush. The commutator has electrically conducting surfaces that are electrically separated from each other by non-conducting segments. The edges of the conducting surfaces adjacent to the non-conducting segments are oriented at an angle to the rotational axis of commutator. The commutator brush has edges oriented at substantially the same angle.

Abstract: A rotor for an electric motor, including a shaft (1), a lamination parcel (2) and a current distribution element (3), which are mounted on the shaft (1) coaxially therewith and for joint rotation therewith, and insulating sleeve members (4,5) coaxially mounted on the shaft (1) one behind another for insulatingly supporting, respectively, the lamination parcel (2) and the current distributions element (3) on the shaft (1).

Abstract: A varistor is mounted to a commutator using intermediary springs which are soldered to the terminals of the varistor. The springs engage the tangs of the commutator without soldering to physically and electrically connect the varistor to the commutator.

Abstract: A copper alloy having an improved corrosion resistance in an alcohol-containing medium, which consists essentially of 0.5 to 8 weight percent tin and/or nickel alone or in combination, 0.02 to 0.15 weight percent zirconium, and remainder weight percent copper. The zirconium is dispersed in the copper alloy as precipitates. The copper alloy is suitable for a commutator material used in a DC motor having an improved abrasive resistance.

Abstract: There is disclosed a compact design for the electronic circuits required to provide electrical contact to a SED roll of a segmented electrode development unit. In this invention, all the required high voltage and low voltage circuitry is placed on a printed flexible circuit which is folded and rolled into a cylindrical circuit to be connected to the SED roll. The flexible printed circuit has a plurality of output terminals each of which will be connected to one of the electrodes of the SED roll. In this invention, a spool is used to support the connection of the cylindrical circuit to the SED roll.

Abstract: A commutator has a base, a plurality of commutator segments mounted on the base and a noise suppression element. The noise suppression element is electrically connected to the segments by a connecting element, in the form of an elastomeric ring having conductive portions, which is compressed between the noise suppression element and the commutator segments, or terminals associated with the commutator segments, to avoid the need to solder the noise suppression element to the segments.

Abstract: A flat commutator for an electric motor of a vehicle fuel pump. The commutator is made with a one-piece carbon ring having a flat outer face, a one-piece conductor ring with a base portion embedded in the carbon ring and underlying outer face, and a housing of a plastic insulating material molded on the rear face of the carbon ring and adapted to mount the commutator on a motor armature. A plurality of circumferentially spaced apart grooves extend radially and axially completely through both the carbon ring and the conductor ring to provide a plurality of individual sintered carbon segments each with a separate conductor for electrically connecting the segments with armature coils.

Abstract: An induction motor includes a stator defining stator inner and outer diameters extending about a longitudinal axis, the stator includes a plurality of windings extending longitudinally and circumferentially about the longitudinal axis between the stator inner diameter and the stator outer diameter and passing an electric current therethrough to create a magnetic field, a rotor extends along the longitudinal axis having a rotor length and a rotor outer diameter less than the stator inner diameter, the rotor being rotatable about the longitudinal axis relative to the stator, the rotor including at least one electrically conductive bar extending parallel to the longitudinal axis adjacent the rotor outer diameter for receiving an induced current due to the magnetic field, an end cap at each end of the rotor contacting the at least one electrically conductive bar and a capture ring attached to each end of the rotor to prevent movement between the end caps and the rotor.

Abstract: The invention relates to a rotating element of an electrical machine, rotating electrical contact parts and electrical machines containing these devices.

Abstract: In the case of a plug-in commutator with a hub body (1) consisting of an electrical isolation material and having evenly distributed and positioned grooves of like design over its circumference, in which each of the segments (5)--of like design--which form the commutator path, is inserted by forming a form-fit connection in radial direction, the segments (5) are safeguarded from a shift in relation to the hub body (1) by a clamping force that is based on an overdimension (x, z) of the segments (5) and/or of material parts of the hub body (1) that facilitate the positioning of the segments (5). Only in the area of the two end sections (18, 21) of the segments (5) and/or the grooves is the overdimension (x, z), which determines the clamping force exerted on the segments (5), provided.

Abstract: There is provided a flat type commutator which secures fixing of carbon (graphite) commutator pieces to both metal plate with terminals attached thereto for connecting winding and electrically insulating support, and which can be manufactured easily and at a low manufacturing cost.A flat type commutator with the brush slide-contact surface thereof being perpendicular to the axial direction of a rotor, wherein a plurality of commutator pieces 3 mutually isolated by slits 4 are directly fixed to an electrically insulating support 1, and a metal plate 5 for connecting said commutator pieces, each having terminals 6 for connecting windings is fixed on the outer peripheral surface of said each commutator piece 3 which is in parallel with the axial direction of the rotor.

Abstract: The commutator segments for a d.c. electric motor includes one or plurality of slots which improves horsepower at less amperage.

Abstract: A reinforcement ring (10) for rotating bodies, for example commutators, comprises at least one metal ring (12) having a rectangular cross-section and a fiberglass ring (14) having a rectangular cross-section, the metal ring and the fiberglass ring both being connected at their end faces to form a unit.

Abstract: A rotor for an electric motor comprises a shaft, a commutator fitted to the shaft and connected to a winding wound around poles of an armature core, and a noise suppressor. The noise suppressor 40 has chip capacitors 44 connected to terminal portions 38 of commutator segments 32. The capacitors 44 have a common terminal 45 connected together to form a star connection via a ring formed from a conductive layer 42 on a board 41 or from resilient wire. The capacitors 44 may be soldered to the wire ring and to the commutator segments or may be held in recesses formed in the base of the commutator in direct contact with the commutator segments under resilient urgings of the ring to form a solderless connection. It is particularly suited to rotors using mechanical connection type commutators to form solder-free rotors.

Abstract: An assembled commutator has a segment support portion and a housing portion. The housing portion has housing members formed with axially extending "T"-shaped recesses and transversely extending slots for receiving armature leads. Insulation displacing terminals are inserted in the "T"-shaped recesses and formed with slots which cooperate with the transversely extending housing slots to grip and contact the armature leads. The terminals may also be formed with recesses for receiving armature leads after the terminals have been placed in the housing portion and during the winding of the rotor. The terminals are held in place by commutator segments and include recesses for receiving retainers located on the commutator segments. The commutator segments may also include a carbon portion which surrounds a copper connection strip for connecting the terminals to the carbon portion of the commutator segment.