Abstract: A short-circuiting member for preventing a commutator from being elongated in the axial direction without increasing the types of different components. The short-circuiting member includes components, each having outer and inner circumferences. Each component includes outer circumference terminals arranged along the outer circumference, inner circumference terminals arranged along the inner circumference, and connection portions connecting a corresponding one of the outer circumference terminals and a corresponding one of the inner circumference terminals that are separated from each other by a predetermined angle in a circumferential direction. The outer and inner circumference terminals are substantially formed along the same plane. The components are laminated in a state in which the connection portions of one of the components are reversed to the connection portions of another one of the components.

Abstract: A rotation control motor comprises a shaft, an armature having an armature core of which teeth are wound by wires to form coils, a commutator, and a field magnet. The armature core has a plurality of teeth, the commutator has a plurality of commutator segments corresponding to the number of teeth, and the coils comprise a normal coil and a brake coil. When the motor rotates faster than expected, the brake coil brakes the motor by magnetic flux, and the motor can rotate within a stable speed range.

Abstract: An electrical machine having at least four exciter poles in the stator and having a commutator rotor, which has a number of slots pole teeth on its circumference that is greater than the number of exciter poles, and having twice as large a number of commutator laminations, which via at least two carbon brushes serve to supply current to coils which are each wound on one of the pole teeth, and contact bridges each joined together diametrically opposed laminations. When there is an even number of slots, pole teeth and coils, the beginning and end of one coil of the coils disposed on adjacent pole teeth is connected directly to the laminations adjacent to one another, and the beginning and end of the other coil is connected via one of the contact bridges to the laminations adjacent to one another.

Abstract: In an electric motor having high-speed and low-speed brushes, durability is improved and vibration/noise is reduced. The electric motor has a low-speed brush 21a, a high-speed brush 21b, and a common brush 21c. Formed in the electric motor are a first coil 7A1 which is wound between given slots 11, and a second coil 7A2 which is wound in a direction opposite to a direction of the first coil 7A1 between slots 11 existing at positions point-symmetric to the given slots 11 with respect to a center of a rotation shaft. An armature coil 7 is formed by the first and second coils 7A1 and 7A2. If the armature coil 7 is short-circuited by the high-speed brush 21b, the first coil 7A1 and the second coil 7A2 of the short-circuited armature coil 7 exist at positions symmetric to each other with respect to an axis line extending through the center of the high-speed brush 21b and the center of the rotation shaft.

Abstract: A short-circuit member assembly for short-circuiting a plurality of segments arranged in a circumferential direction is disclosed. The short-circuit member assembly includes first and second short-circuit member groups that are superimposed with each other. The first short-circuit member group includes m first terminals, which are superimposed and joined with m first terminals included in the second short-circuit member group to form m first-terminal joint portions. The m first-terminal joint portions and the remaining first terminals in the short-circuit member groups are arranged in the circumferential direction and connected to the segments. All of the second terminals in the first short-circuit member group are superimposed and joined with all of the second terminals included in the second short-circuit member group.

Abstract: A segment center line is defined for each segment. Each segment center line extends from the center in the circumferential direction of the radially outer end of the segment to the center in the circumferential direction of the radially inner end of the segment. A portion of each segment center line where there is the center in the circumferential direction of the radially inner end is inclined in a first circumferential direction relative to the radial line. A short-circuit member has a plurality of connection pieces. Each connection piece has an outer short-circuit end, an inner short-circuit end, and a coupling portion. Each coupling portion links the outer short-circuit end to the inner short-circuit end, which is shifted in a second circumferential direction from the outer short-circuit end.

Abstract: A commutator 10 for an electric motor comprises a plurality of commutator segments supported by a base. The segments have an electrically conductive body portion 14 and at least one electrically conductive foldable tang 16 provided on the body portion 14 for engaging a winding lead wire 44 of an electric motor. The foldable tang 16 has a proximal end 18 on or adjacent to the body portion 14, and a distal end 22 remote from the proximal end 18. A wire-accommodating portion 30 is provided on or adjacent to the foldable tang 16, so that, when the tang 16 is folded, the wire-accommodating portion provides a predetermined gap 56 for the winding lead wire 44.

Abstract: A rotor exhibits a carbon commutator (4). For the manufacture of the rotor, an insulating support (9) is positioned on the rotor shaft (1). The insulating support (9) features lugs (13), around which the winding ends (8) of the rotor coils (3) are wound; after the removal of the insulation, the winding ends (8) are provided with an electrically conductive adhesive. The commutator (4) is the put on the lugs (13) with the winding ends (8). By means of this process, the winding ends (8) are mechanically and electrically directly connected to the corresponding commutator segments.

Abstract: A commutator for an electric machine with commutator bars, wherein on one side of the commutator which faces a rotor winding, at least one angled retaining element is formed on at least one commutator bar in order to switch contact conductors of the rotor winding, as well as to connect them with the respective commutator bar, wherein the commutator bar comprises two angled retaining elements.

Abstract: A coil of a winding is wound around teeth of an armature core for a predetermined number of times in a motor. A start lead of the winding connects between the coil and a corresponding start segment among a plurality of segments of a commutator. A finish lead of the winding connects between the coil and a corresponding finish segment among the plurality of segments. The finish segment is located adjacent to a diametrically opposed one of the plurality of segments, which is circumferentially displaced by about 180 degrees from the start segment and is thereby diametrically opposed to the start segment.

Abstract: In a direct current electric motor, segment pieces of a commutator are generally planar and are arranged one after another in a circumferential direction about a rotational axis of the commutator. A slidably engaging surface of each segment piece, which is slidably engageable with a plurality of brushes of the motor, extends in a plane that is generally perpendicular to the rotational axis, and each segment piece includes a radially inner engaging portion at a radially inner end part of the segment piece. Each conductive line extends along a corresponding straight line and electrically interconnects between the radially inner engaging portions of corresponding two of the plurality of segment pieces to implement the same electric potential in the corresponding two of the plurality of segment pieces.

Abstract: A commutator including a commutator main body having a plurality of commutator pieces and a short-circuit member having a short-circuit conductor for short-circuiting commutator pieces. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. The first short-circuit member formation group is thinner than the second short-circuit member formation group. The first and second short-circuit member formation groups are fixed to each other by crimping projections, which are formed on the second short-circuit member formation group through punching, in a state inserted through holes, which are formed in the second short-circuit member formation group.

Abstract: The invention relates to a face commutator (101) having a supporting body (102) consisting of an electrically insulating material, a large number of connection segments (108) consisting of an electrically conductive material for connecting in each case at least one end of a coil winding, and a large number of contact surface segments (112) which form a contact surface (14) of the face commutator (101), the contact surface segments (112) being mechanically rigidly and electrically conductively connected to the connection segments (108), and the supporting body (102) and/or the connection segments (108) having an integral design, and the supporting body (102) being prefabricated and having openings (118) into which the connection segments (108) are inserted, characterized in that the supporting body (102), at least in sections, is overdimensioned in the region of the openings (118) in relation to the inserted connection segments (108), in that the connection segments (108) are fixed owing to a clamping effect o

Abstract: An armature for a brush commutated electric motor having a distributed coil winding arrangement for reducing brush arcing and electromagnetic interference (EMI). The winding pattern involves winding a first coil into a first pair of slots of the armature. A second coil having a first subcoil portion is then wound into the same slots as the first coil, while a second subcoil portion of the second coil is wound into a pair of slots that is offset by one slot position from the first pair of slots. The two subcoil portions have the same number of turns, and the total turns of the two subcoil portions equals the number of turns of the first coil. A third coil is then wound in the same slots as the second subcoil portion of the second coil. The third coil has the same number of turns as the first coil. This pattern is repeated around the armature.

Abstract: An electric machine including armature equipped with armature slots for accommodating armature coils, a commutator equipped with commutator segments, and a first and second hammer brush that each rest against the commutator in sliding fashion by means of a spring lever, in which at least one armature coil is comprised of two partial coils that are situated symmetrically to each other in relation to the rotation axis of the armature and the partial coils are connected to two adjacent commutator segments of the commutator.

Abstract: A motor has a plurality of excitation coils, a commutator having a plurality of segments, a plurality of supply brushes and a short-circuit line. Each coil is connected to corresponding ones of the segments. The supply brushes include a plurality of supply brushes each having one of an anode and a cathode. At least one supply brush has the other one of an anode and a cathode. The supply brushes each simultaneously contact different one of the segments. The short-circuit line short-circuits segments that simultaneously contact the supply brushes of the same pole. The supply brushes of the same pole separate from the short-circuited segments at different times.

Abstract: Structures of direct current motors or ac commutator (Universal) motors which use a concentrated winding on the rotor with coils wound around the teeth. The number of commutator segments is higher than the number of rotor teeth. Several coils are wound around the same tooth. The terminals of the coils are connected to different segments of the commutator. The parallel paths of the armature winding are perfectly balanced. An equal current distribution through the parallel circuits of the armature is maintained and there is no circulation current between these parallel circuits. The problems related to commutation are reduced because the value of the coil inductances is low. The copper volume of the end-windings, the Joule losses and the axial length of the motor armature are lower than a lap or a wave winding with interlocked coils. Two kinds of structures with a concentrated winding are presented: some with rotor teeth with identical dimensions and some with rotor teeth with different dimensions.

Abstract: An electrical machine has a base body provided with conductors fixed in grooves of the base body by a material which limits a groove slot at both sides, and the conductors in the grooves are deformed by a stamping punch introducible through the groove slot into the corresponding groove so that a conductor cross-section is adjusted to a groove cross-section in a region of the corresponding conductor.

Abstract: In a fuel pump, four permanent magnets are installed in a housing. An armature is installed inside the permanent magnets rotatably. Six magnetic pole coil portions of the armature are installed in a central core. Each magnetic pole coil portion has a coil core, a bobbin and a coil formed by winding a winding on the bobbin in a concentrated winding form. Each coil core has an outer region in opposition to the permanent magnet in a direction of revolution, and a board-shaped coil-winding portion extending from the outer region toward the central core. Each bobbin covers the coil core except for the outer surface of the outer region and a convex portion.

Abstract: A rotor assembly for an electric motor, including: a rotor shaft, an armature, wire windings and a commutator, wherein the rotor assembly further includes a ring cap directly connected with the commutator. The ring cap includes chip capacitors soldered on a printed circuit board through a Surface Mount Device (SMD) technique. The ring cap serves as a reservoir for absorption of any noise/sound generated from rotation of the commutator in a DC motor around its brushes. The invention enables compliance with current and future EMC requirements in, for example, the automotive industry.

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 comprises a plurality of commutator terminals each having a contact part 12 and a separate terminal part 13, first and second supports 10 and 11, respectively, of insulating material for supporting the contact parts and the terminal parts, respectively, and a plurality of carbon segments 14 formed on the first support 10 and over the contact parts 12, respectively, of the terminals. The terminal parts 13 each comprise a first portion 24 to which armature winding wire of a motor can be connected by a thermal connection process and a second portion 25 for making a mechanical connection with a respective contact part.

Abstract: A core includes a ring body and a plurality of teeth. The teeth extend radially outward form the outer circumference of the ring body. The core is formed by assembling a first core member and a second core member. Each core member has part of the teeth the number of which is half the total number of the teeth. Each tooth includes a tooth body about which the coil is wound, and a magnetism converging portion provided at the distal end of the tooth body. The tooth height of each tooth body gradually increases from a distal section to a proximal section of the tooth body. The tooth width gradually decreases from the distal section to the proximal section. The wire is wound about each of the teeth of the first and second core members. Then, the first and second core members are assembled to form the core. Accordingly, a rotor core having a high coil accommodation efficiency and a high coil space factor is obtained.

Abstract: A commutator assembly for a motor has a recessed portion formed to each commutator segment so that coils, which are pressed and deformed by bending the hooks of commutator segments, can be accommodated in the recessed portion. With this arrangement, the commutator assembly can improve the reliability of electric connection of the hook of the commutator segments with a conductive wire.

Abstract: Each of the rotor magnetic poles is composed of a winding around a laminated core and each of both ends of each wound wire is connected to a commutator leg part coupled with a tip of a corresponding commutator segment of the commutator unit. Each of the commutator leg parts comprises a base portion extending outward in a direction substantially normal to the radial direction from the tip of the corresponding commutator segment tip and coupled to the commutator segment tip and a tip portion narrowed stepwise to let the ends of a wound wire be connected. A disk-shaped varistor having a hole at the center is mounted over the base portion of the commutator leg part, and each electrode of the varistor is soldered onto the corresponding base portion. Further, the commutator leg parts are punched and cut out of a reel-wound flat parent metal sheet and fixed to the commutator segment tips.

Abstract: An armature for a brush commutated electric motor having a distributed coil winding arrangement for reducing brush arcing and electromagnetic interference (EMI). The winding pattern involves segmenting each coil into first and second subcoil portions with differing pluralities of turns. Each subcoil portion is wound around separate pairs of spaced apart slots of a lamination stack. Adjacent coils are wound such that one subcoil portion of each is wound in a common slot to therefore form an overlapping arrangement of each pair of adjacently coils. The winding pattern serves to “shift” the resultant magnetic axes of each coil in such a manner so as to significantly reduce brush arcing and the EMI resulting therefrom. The reduction in EMI is sufficient to eliminate the need for EMI reducing components, such as chokes, which have typically been required to maintain EMI to acceptably low levels.

Abstract: Structures of direct current motors or ac commutator (Universal) motors which use a concentrated winding on the rotor with coils wound around the teeth. The number of commutator segments is higher than the number of rotor teeth. Several coils are wound around the same tooth. The terminals of the coils are connected to different segments of the commutator. The parallel paths of the armature winding are perfectly balanced. An equal current distribution through the parallel circuits of the armature is maintained and there is no circulation current between these parallel circuits. The problems related to commutation are reduced because the value of the coil inductances is low. The copper volume of the end-windings, the Joule losses and the axial length of the motor armature are lower than a lap or a wave winding with interlocked coils. Two kinds of structures with a concentrated winding are presented: some with rotor teeth with identical dimensions and some with rotor teeth with different dimensions.

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 rotor for a small-sized motor has a plurality of rotor magnetic poles and a commutator on a rotor shaft, and both ends of a wire of each winding of the rotor magnetic poles are tied up with and connected by spot welding to a U-shaped hook-type commutator leg connected to the corresponding commutator piece end of the commutator, respectively. The commutator leg has a copper-based base material, and is composed by attaching a thin layer of a clad material with a melting point lower than that of the above described base material and a high electric resistance thereon at the surface part to be inside when bent to the U-shaped hook type. Thus, in the connection between the commutator leg and the copper wire material of the small-sized motor, the reduction of defectives of breaking of the wire because of heat shock at the time of welding is achieved, and in the meantime, the stabilization of welding is achieved, so that the reliability of the connection can be increased.

Abstract: An arc length in contact with a commutator of two brushes in a rotational direction of a motor is defined as not more than 5% of an outer rim length or circumference of the commutator, i.e., not more than ?A/2O, where A is an outside diameter of the commutator. A number of shorted segments of the commutator, which short is caused by the brush, can be minimized so that reduction in output of the motor can be prevented. As a result, the motor employed in a car product or an electric tool can be downsized and made lighter.

Abstract: A low-friction and low-vibration rectifying structure including an electrode-segment forming member of a stator which has two electrode segments disposed therein. An annular stator-side groove is formed in the electrode-segment forming member with two electrode segments. Three commutator segments are disposed in a commutator-segment forming member of a rotor. An annular rotor-side groove is formed in the commutator-segment forming member with the three commutator segments. A conductor ball and an insulator ball are arranged inside of the stator-side groove and the rotor-side groove.

Abstract: When one of armature coils is in a beginning of a commutation process, a center line of a trailing end tooth of a corresponding group of teeth, around which the one of the armature coils is wound, is generally aligned with a corresponding boundary between magnets. When the one of the armature coils is in an end of the commutation process, a center line of a leading end tooth of the corresponding group of the teeth is generally aligned with another boundary between the magnets.

Abstract: A small brush motor which uses a three-electrode varistor and which suppresses disconnection or short-circuits of crossover wires of coils.

Abstract: A rotor for a small-sized motor has a plurality of rotor magnetic poles and a commutator on a rotor shaft, and both ends of a wire of each winding of the rotor magnetic poles are tied up with and connected by spot welding to a U-shaped hook-type commutator leg connected to the corresponding commutator piece end of the commutator, respectively. The commutator leg has a copper-based base material, and is composed by attaching a thin layer of a clad material with a melting point lower than that of the above described base material and a high electric resistance thereon at the surface part to be inside when bent to the U-shaped hook type. Thus, in the connection between the commutator leg and the copper wire material of the small-sized motor, the reduction of defectives of breaking of the wire because of heat shock at the time of welding is achieved, and in the meantime, the stabilization of welding is achieved, so that the reliability of the connection can be increased.

Abstract: The invention relates to a multipole commutator motor (14) having at least four stator poles (16-19) and having armature coils (31-42) that work together with these stator poles and that, for the supply of power, are each connected electrically with two commutator bars (1-12) of a commutator (22), and whose number is greater than the number of the stator poles (16-19), it being provided that, in order to reduce the number of brushes (20, 21; 23, 24) contacting the commutator (22), armature coils (31-42), that form armature poles having identical magnetic orientation are connected in parallel through electrical bridge conductors (43-48) at the armature. For the commutator motor (14), it is proposed that the bridge conductors (43-48) be routed at least partially via armature slots (71-82).

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 rotor for a small-sized motor has a plurality of rotor magnetic poles and a commutator on a rotor shaft, and both ends of a wire of each winding of the rotor magnetic poles are tied up with and connected by spot welding to a U-shaped hook-type commutator leg connected to the corresponding commutator piece end of the commutator, respectively. The commutator leg has a copper-based base material, and is composed by attaching a thin layer of a clad material with a melting point lower than that of the above described base material and a high electric resistance thereon at the surface part to be inside when bent to the U-shaped hook type. Thus, in the connection between the commutator leg and the copper wire material of the small-sized motor, the reduction of defectives of breaking of the wire because of heat shock at the time of welding is achieved, and in the meantime, the stabilization of welding is achieved, so that the reliability of the connection can be increased.

Abstract: A motor includes a commutator, which has twenty-four segments. Each of eight short-circuit members is connected to three of the segments. Each short-circuit member extends in an arcuate form in an angular range corresponding to arranging positions of three segments to be connected to the short-circuit member. The eight short-circuit members are laminated to form a multiple-layer structure in the axial direction of the commutator. The short-circuit members form a substantially cylindrical laminated body. The short-circuit members are formed and arranged such that the number of the layers of the laminated body is less than the number of the short-circuit members. As a result, the axial dimension of the laminated body is reduced and the miniaturization of the motor in the axial direction is achieved.

Abstract: A sectioned conductor adapted to accommodate stress forces with reduced internal deformation while forming a conductive path between the rotor coils and a radial stud extending into the rotor shaft of a power generator is provided along with related methods. The sectioned conductor is formed of at least two distinct, spaced apart members that remain electrically connected as the second sectioned member moves relative to the first sectioned member in response to stress forces including those arising from centrifugal force caused by the rotation of the rotor shaft within a stator coil, thermal expansion as caused by temperature increases in conductive components of the power generator, and from vibratory motions of the power generator.

Abstract: Each of the rotor magnetic poles is composed of a winding around a laminated core and each of both ends of each wound wire is connected to a commutator leg part coupled with a tip of a corresponding commutator segment of the commutator unit. Each of the commutator leg parts includes a base portion extending outward in a direction substantially normal to the radial direction from the tip of the corresponding commutator segment tip and coupled to the commutator segment top and a tip portion narrowed stepwise to let the ends of a wound wire be connected. A disk-shaped varistor having a hole at the center is mounted over the base portion of the commutator leg part, and each electrode of the varistor is soldered onto the corresponding base portion. Further, the commutator leg parts are punched and cut out of a reel-wound flat parent metal sheet and fixed to the commutator segment tips.

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 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: The leading end of a wire to be wound fed from a coil winder is wound around one of commutator leg parts a prescribed number of turns and then wound around a corresponding salient pole. After that, it is similarly wound successively around other commutator leg parts and around other salient poles and, after it is wound around the same commutator leg part as the one around which the leading end of the wire was first wound, the wound wire is cut. Only the portions that will be wound around the commutator leg parts in synchronization with the feed of the wire to be wound from the coil winder are stripped of their insulating coat prior to being wound, and the wound portions of the commutator leg parts are welded.

Abstract: The present invention provides a dynamo-electric machine that suppresses vibrations caused by imbalance due to electromagnetic forces and that also suppresses imbalance in magnetic attraction forces generated owing to the difference in the number of coil portions among electric circuit portions. This dynamo-electric machine comprises an armature having a winding consisting of a plurality of coil portions each formed by lap-winding a conductor between a corresponding pair of slots formed in an outer circumferential surface portion of a core fixed to a shaft in such a way as to extend in an axial direction thereof, a commutator fixed to an end portion of the shaft and having a plurality of segments to which both end sections of said coil portions are electrically connected, brushes made to respectively abut against the surfaces of the segments of the commutator, and equalizers for connecting said segments, which are to be at equal electric potential, to each other.

Abstract: A DC motor includes an armature winding that includes a first coil group of a plurality of phase coils and a second coil group of a plurality of phase coils, a commutator, a brush unit that includes two pairs of brushes and a motor current supply device. The first and second coil groups are connected in series to a DC power source via the commutator and the two pairs of brushes to be supplied with motor current by the motor current control device. Therefore, voltage applied across the brushes and the commutator is reduced, and arc discharge is suppressed.

Abstract: A method of linking commutator bars of a commutator for a motor wherein N is the number of magnetic poles of the motor and N is an even integer greater than 2. The method include a) arranging a plurality of commutator bars to be generally equally spaced in a circular arrangement to define the commutator, each commutator bar having a tang extending therefrom, b) contacting an end of a continuous, insulated conductive member to a tang, c) moving the member to contact a second tang which is disposed at an angle of 720°/N from the previously contacted tang to form a link, and when N is greater than four, repeating this step until N/2−1 links are created, d) moving the member to contact a tang which is immediately adjacent to the second tang contacted in step (c) such that the member defines a bridging portion between the adjacent tangs, e) repeating steps (c) and (d) and until all tangs have been contacted by the member, and f) cutting the bridging portion between adjacent tangs.

Abstract: A planar carbon segment commutator includes a commutator base of insulating material. The base has a rotational axis and front and rear surfaces extending, at least in part, transversely to the rotational axis. A plurality of apertures extends through the base. The commutator also includes a plurality of commutator terminals, each terminal having a terminal portion and a contact portion. Each contact portion extends through one of the apertures and is bent to lie against or in close proximity to the front surface of the base. Each terminal portion has two cutting edges for cutting insulation on a connector portion of a winding and a slot which, in use, straddles and grips the connector portion. The commutator also includes a plurality of carbon segments formed on the front surface of the base and over the contact portions, respectively, of the terminals and a housing having a plurality of housing recesses for receiving the terminal portions.

Abstract: The leading end of a wire to be wound fed from a coil winder is wound around one of commutator leg parts a prescribed number of turns and then wound around a corresponding salient pole. After that, it is similarly wound successively around other commutator leg parts and around other salient poles and, after it is wound around the same commutator leg part as the one around which the leading end of the wire was first wound, the wound wire is cut. Only the portions that will be wound around the commutator leg parts in synchronization with the feed of the wire to be wound from the coil winder are stripped of their insulating coat prior to being wound, and the wound portions of the commutator leg parts are welded.

Abstract: An eccentric rotor includes an eccentric printed wiring commutator device having first and second surfaces, an expanded fan shape when viewed in a plane, a central hole for shaft installation, and a plurality of segment patterns at a periphery of the first surface; a wound, non-molded air-core armature coil incorporated in an air-core armature coil position determination guide protruding from and eccentric at the second surface of the printed wiring commutator device; an end connection portion located at an outer circumferential portion of the printed wiring commutator device for latching an end portion of the wound armature coil within a range not deviating from a turning circumference and simultaneous electrical connection with the segment patterns is possible, and not overlapping the wound armature coil when viewed in a plane; a resin bearing holder inserted in the shaft installation hole with a first part protruding toward the segment pattern and, simultaneously, a second part extending toward the second

Abstract: A star connected wound rotor has a shaft 12, a rotor core 14 fitted to the shaft, a commutator 16 fitted to the shaft adjacent one end of the rotor core and a star connector 18 fitted to the shaft adjacent the other end of the rotor core and a plurality of coils wound about the rotor core and connected to the commutator and the star connector, thereby forming a star connected rotor winding 20.