Abstract: Static eliminator device includes a nonmetallic pultruded composite member having a plurality of conductive carbon fibers provided within a polymer matrix of thermosetting resin, wherein the plurality of carbon fibers are oriented within the polymer matrix in a longitudinal direction of the pultruded composite member and extend continuously therethrough. The pultruded composite member has at least one laser fibrillated end including a brush-like structure of densely distributed filament contacts formed from an exposed length of the carbon fibers for contact with the surface. The brush-like structure has either a straight edge configuration or a shaped configuration. The static eliminator device may include a base member for holding the pultruded composite member, wherein the base member electrically communicates with the plurality of conductive fibers to permit the electrical charge to pass therefrom.

Abstract: In order to be able to ensure with low outlay a slip ring or commutator motor having a high level of freedom from noise and good running quality at maximum power, despite unavoidable deviations from circularity of the slip ring or commutator ground by the brushes abutting thereon, it is proposed according to the invention that the brushes (6; 7; 8) be supported such that they can pivot about an axis which runs radially in the vicinity of the surface and axially essentially in the axial direction of the commutator (1) or slip ring; that, according to one embodiment, the axis be formed by a guide pin (31; 41), which is retained in a brush housing (2) at least partially embracing the brush (6; 7) in the vicinity of the surface of the commutator (1) or the slip ring, and which is plugged axially through a guide slot (61; 71) running in the compression direction of the brush and open towards the surface of the slip ring or commutator (1), or that the brush (6) be tangentially embraced externally by the brush compr

Abstract: A pair of hollow permanent magnets mounted to form a toroidal stator having cylindrical gaps and opposed cavities. The magnets are polarized such that their magnetic flux passes in one direction through the gaps to intersect the rotor along two cylindrical bands and then passes through the magnetic shell and subsequently in the opposite direction through the cavities to intersect the rotor in a cylindrical region located between the cylindrical bands. An electrical circuit couples a utilization device to the rotor. Another embodiment of the invention uses a magnetic mirror to replace one of the permanent magnets. Still other embodiments teach the use of a plurality of toroidal stators mounted in tandem about a common rotor. The machine may be used as a homopolar generator or a homopolar motor.

Abstract: An electrical machine having a stator formed from a pair of cup-shaped permanent magnets symmetrically disposed on opposite sides of a conductive, disk-shaped rotor. The magnets are polarized such that a portion of their external magnetic flux passes in one direction through a short peripheral gap formed by the magnets in which the periphery of the rotor is disposed. The remainder of the external magnetic flux substantially passes in the opposite direction through a cavity defined by the inner volume of the cup-shaped magnets. The inner portion of the disk-shaped rotor is disposed in this cavity. One embodiment of the invention implements the cup-shaped magnets with modified "magic spheres" mounted on either side of the conductive disk-shaped rotor. Other embodiments use a magnetic plate on one side of the disk-shaped rotor to act as a magnetic mirror for a cup-shaped magnet mounted on the other side of the rotor.

Abstract: A miniature motor including a housing formed into a bottomed hollow cylindrical shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, an end plate engaged with an opening of the housing, and a rotor rotatably supported by bearings provided on the housing and the end plate. Power is fed to the motor by bringing a commutator constituting the rotor into sliding contact with brushes, in which a plurality of brush pieces branched from the brush are formed in such a manner that tangential lines formed by the brush pieces with respect to the commutator at predetermined contact points are made different at the tips of the brush pieces, and that the tips of brush pieces make different angles from the lines extended in the longitudinal direction of the brush pieces. The tips of brush pieces are bent to form a V shape in cross section. The tips of the brush pieces come in contact with the commutator at the opened legs of the V-shaped cross section.

Abstract: An electric motor has a tubular housing part, permanent magnets arranged inside the housing part, a rotatable motor armature with a collector having a running surface, a plurality of sliding brushes having sliding surfaces abutting against the running surface of the collector, and an element for loading the motor armature in direction of its rotary axis toward the sliding brushes so that the running surface of the collector which in its projection is formed as an annular surface abuts against the sliding surfaces of the sliding brushes.

Abstract: The present invention relates to a rotary machine. Main technical problem is in that two rotating forces being different in the rotating direction are taken to the outside using one motor. Consequently, in the invention, a stator (3) is rotatably supported by a support body (2) and provided with an output shaft or an input shaft (34), and further static side and rotating side are electrically connected. The rotary machine according to the invention can be applied as the drive source of a load requiring the rotating force in different rotating direction, or can be applied as a generator by the power source of wide range and other wide use ranges.

Abstract: A direct current machine, such as a motor or a dynamo, has a commutator. The commutator has a contact surface which includes a generally cylindrical contact surface. The commutator is rotatable around an axis. A brush assembly of the direct current machine includes at least two brushes. Each brush has a distal surfaces which is engagable to a contact surface of the commutator. A brush holder movably holds the brushes toward the commutator. A clearance is defined between the brush and the brush holder. Each spring urges the corresponding brush against the contact surface of the commutator. Further, the spring urges the brush to be off-set toward the front side of a rotational direction of the commutator, within the brush holder.

Abstract: A metal-filled gaphite brush used for a miniature motor, which has a permanent magnet field and is caused to rotate through current commutation via a commutator, formed by bonding graphite powder and used for making sliding contact with the commutator for current commutation, in which the metal-filled graphite brush is formed by pressure-forming and sintering a mixture of highly purified graphite powder and metal powder; the graphite powder used for the metal-filled graphite brush being purified to reduce the ash content thereof 0.05 wt. %, and the method of making the same.

Abstract: A brush assembly for providing contact between a grounding brush and a rotating shaft, in which the noncontact time associated with brush bounce is reduced. A brush is provided which is fixed to a pivotable arm, with a bias force applied to the arm, such that when the brush is bounced from a shaft as a result of vibration or shaft wobbling, the bias force will reestablish contact between the brush and shaft. Rolling contact between a negator spring and the arm is also provided for reducing friction associated with contact between the spring and pivotable arm. Due to the reduced friction provided by the rolling contact, and more significantly by the pivotal mounting of the arm to which the brush is fixed, the response of the assembly in reestablishing contact with the shaft is greatly improved.

Abstract: A brush holder for a vehicular a.c. generator is characterized by stealth grooves for letting a compression spring escape, the stealth grooves being provided longitudinally in a portion excluding the lower portion of a brush box, the stealth grooves being provided in both respective inner walls of a square hole of the brush box where a brush contacts the inner walls thereof.

Abstract: A brush and slip ring apparatus for an alternating current generator. A brush assembly is secured to a rotor shaft of the generator to rotate therewith. The brush assembly includes two axially spaced brushes that are pivoted to a brush support that is secured to the shaft. When the shaft is rotated, the brushes move outwardly away from the shaft due to centrifugal force. The brushes respectively engage two axially spaced fixed slip rings that surround the brush assembly. The brushes are maintained engaged with the slip rings due to centrifugal forces developed by the pivotally mounted brushes. The brushes are connected to a field coil of the rotor of the generator.

Abstract: An electric motor has a stator comprising a plurality of permanent magnets disposed on an interior surface of the stator and an armature comprising a plurality of pole segments equally spaced apart on a shaft. Each pole segment is wound with a coil, which is powered to induce a magnetic field to interact with one of the permanent magnets in the stator. Four of the armature coils provide magnetized poles to interact with the plurality of poles of the stator at a time, to produce a powerful torque for rotating the armature.

Abstract: A composite brush to shunt attachment wherein a volatile component of a composite but mostly metallic brush, used for current collection purposes, does not upon welding or brazing, adversely affect the formation of the interfacial bond with a conductive shunt which carries the current from the zone of the brush. The brush to shunt attachment for a brush material of copper-graphite composite and a shunt of copper, or substituting silver for copper as an alternative, is made through a hot isostatic pressing (HIP). The HIP process includes applying high pressure and temperature simultaneously at the brush to shunt interface, after it has been isolated or canned in a metal casing in which the air adjacent to the interface has been evacuated and the interfacial area has been sealed before the application of pressure and temperature.

Abstract: A brush holder device for a commutating electric machine including a ring (7) integral with the stator, brush holders (6) fastened in a mounting position on the ring and connected electrically in pairs by conductors (101, 102) the ring being located perpendicularly to an axis of rotation (X--X') of a rotor (1) of the motor (M), a part whereof projects through a center opening of the ring (7). Each brush holder includes a recess located facing the periphery of the projecting part of the rotor (1) a commutator brush (5) is mounted in the recess so as to establish an electrical contact between the rotor and the stator. The brush holders (6 ) and the conductors (101, 102) form an integral part of the ring (7) made of a thermally stable insulating material. The brush holders (6, 6') and the conductors (101, 102) are fastened in their assembly position by being molded into an insulating and thermally stable material forming the ring.

Abstract: A brush holder plate assembly comprising a brush holder plate fabricated from electrically insulating thermoplastic material and having a plurality of sets of spaced-apart, parallel, raised guiding and support rails integrally formed on one surface of the plate. The plate further has a centrally formed aperture of sufficient cross sectional dimension to be slipped over the commutator of an electric machine after complete assembly of all the parts of the machine. The sets of spaced-apart, parallel, raised guiding and support rails project radially outward away from the centrally formed aperture like the spokes of a wheel. A plurality of snap-in-place, brush holder cartridges are removably secured by slide catches to the respective sets of spaced-apart parallel raised guiding and support rails for physically supporting commutating brushes in an array surrounding the commutator of the electric machine with one exposed end of each brush in physical and electrical contact with the commutator.

Abstract: There is disclosed a flat motor of reduced length and maximized power output and which is suitable to being disposed in a limited space configuration and a close tolerance within other objects which may be present in such limited space.

Abstract: A labyrinth ring having a section of L-shape is radially, inwardly and integrally projected from the inner periphery of a brush holder stay of a motor. This labyrinth ring provides a labyrinth construction in a space portion extending from brushes and a ball and roller bearing in cooperation with the brush holder stay, a commutator, a bearing holder and a distance ring. The thickness of this labyrinth ring is determined to be so thin as to increase the volume of a carbon accumulating space portion formed between the bearing holder and itself as large as possible.

Abstract: A DC motor is provided with a brush arrangement in which two parts of the brushes are arranged around the peripheral surface of a commutator so that each line across the opposite brushes with respect to the central axis of the commutator forms an angle, thus the space between the positive and negative brushes is sufficient to mount components thereon. Each width of the brushes is determined by the number of conducting segments in contact with the brushes of the same polarity, affording sufficient current to flow in the brushes.

Abstract: A slip ring assembly having a rotatable chamber including a shaft rotatably mounted therein. A plurality of slip rings are provided within a ring section of the rotatable chamber and are mounted to the shaft for rotation therewith. The plurality of slip rings for a group of preselected pairs of slip rings. An electrical conductor is connected to each slip ring with each electrical conductor being twisted to at least one adjacent electrical conductor through a central core in the shaft to thereby cancel alternating current due to self-generated voltages. The slip ring assembly also includes a brush assembly having at least one brush support associated with each slip ring with each brush support having brushes extending therefrom in contact with its corresponding slip ring at at least two brush contacts. The brush contacts for each slip are orientated approximately 180 degrees apart.

Abstract: A direct - current electric machine includes a rotor rotatable about an axis of rotation and a stator formed with a plurality of locations angularly equispaced thereon and provided with a respective array of horseshoe magnets extending over 180.degree. about a respective helical coil wounded on a coil axis defined by a respective pair of arms mounted on the rotor and coinciding with a tangent to a circle centered in the axis of rotation.

Abstract: A wafer spinning assembly for use in wafer processing includes a chuck for holding a wafer, a vertically oriented spindle connected to drive the chuck, and a spindle drive motor. The spindle drive motor includes an enclosed cylindrical housing which is enclosed on a top end with a top end cap having an outside surface impermeable to infiltration by wafer processing solutions. A drive shaft is mounted inside the housing for rotational movement and out an unsealed aperture in the top end cap. A motor mounted inside the housing provides electromotive rotational force to the shaft in response to electric power supplied to the motor through a plurality of brush assemblies. The top end cap includes a cylindrical collar portion extending outwardly from the outside surface, oriented generally horizontally, of the top end cap and around the shaft. The motor is deployed so that the shaft is actually aligned with the spindle.

Abstract: A starter having an electric motor which has a yoke constituting the magnetic circuit of the motor and the outside portion of the starter, and a bowl-shaped rear cover made of a resin and secured to the rear end of the yoke by longitudinal bolts, wherein each of said bolts comprises a slender portion which extends in parallel with the axis of the starter through a support plate borne at the rear end of the yoke and extending inward in the radial direction of said yoke and has a front part engaged with the front cover of the starter and a rear threaded part projecting out through the insertion hole of the rear cover, and a spacer provided on the slender portion and located in contact with the plate and the inside surface of the end wall of the rear cover at both the ends of the the spacer; and nuts are engaged with the rear threaded parts of the slender portions of the bolts to attach the rear cover to the rear end to the yoke.

Abstract: The trailing edge of a carbon brush for commutating electric machines has a notch flanked by an ear on either side. The brush can include one or more wafers. The angular thickness of the trailing brush wafer at the notch is such that the brush does not touch more than n commutator contacts at a time. However, the brush wafer is thick enough at the ears to touch n+1commutator contacts at a time. The relatively high resistance of the ears improves commutation.

Abstract: A brush holder support in a dynamic electric machine such as an electric motor includes an electrically insulating support plate which carries on its one side a plurality of brush holders slidably receiving brushes with pig-tails connected thereto. A pair of conductor plates are secured to the other side of the support plate concentrically with one another. The conductor plates are insulated plate from one another by a portion of the support located therebetween. Each of the pair of conductor plates provides electrical connections between the pig-tails of the brushes of the same polarity. The support plate includes notches formed in its inner and outer peripheral edges so as to provide passages for leading the pig-tails from the one side to the other side of the support plate.

Abstract: A superconducting DC machine includes a superconductive field winding housed in a cryostat. A magnetic shield is arranged outside the cryostat. An armature drum is rotatably supported between the cryostat and the magnetic shield. The armature drum of the machine is divided into a plurality of segments along the length thereof, and has arranged thereon current-collecting brushes not more than one half of the segments. Each brush is electrically connected to the opposed one at the other longitudinal end of the same segment of the armature drum and also to the one at the longitudinal opposed end of an adjacent segment in diagonal fashion progressively.

Abstract: A brush holder device for an electric motor has a brush holder, a brush movably received in the brush holder, and a spring which acts between the bottom of the brush holder and the outer end of the brush so as to resiliently press the brush into contact with a commutator. The surface of the bottom of the brush holder on which one end of the spring acts and the outer end surface of the brush on which the other end of the spring acts are inclined in opposite directions along the axis of the motor such that the distance between the surfaces is greater at one axial end than at the other axial end of the brush holder. As a result, the spring is naturally urged to and stably held in the axial end where the distance between these two surfaces is greater. In addition, or alternatively, the bottom surface of the brush holder includes a recessed portion for containing the spring at one axial end of the brush holder.

Abstract: A dynamoelectric machine of the type having rolling element bearing assemblies larger than the commutator and armature and brushcard subassemblies for automated assembly with the brushcard having a displaceable brush retainer for retaining the brushes to form an unobstructed passageway for the bearing assembly and the armature having a self-positioning actuator disk for automatically displacing the brush retainer during assembly so the brushes engage the commutator.

Abstract: An electric motor has a casing having two opposed planar side walls and two opposed curved walls. A permanent magnet is located inside each curved wall and a wound armature is mounted in the casing. A commutator is connected to the winding and two brush arms are supported by a holder at one end of the casing. Each brush arm informed by two electrically conductive strips forming, respectively, a terminal part and a more resilient brush supporting part. The terminal parts extend out of one end of the casing in a plane of symmetry of the casing thereof and the brush supporting parts are secured to respective terminal parts at positions which are offset from the plane of symmetry, on opposite sides thereof.

Abstract: An electrical brush assembly for use with a d.c. dynamoelectric machine commutator 44 having a substantially cylindrical commutator contact surface 46 comprising an electrical brush element 48 having a sliding contact surface 50 engageable with the contact surface of the commutator. The brush element is slidably supported by a brush holder 54, and is urged against the contact surface of the commutator by a spring 58. The sliding contact surface of the brush element is a concave cylindrical surface having a central axis 62 substantially parallel to the central axis 45 of the commutator contact surface, and has a radius R2 about 1.2 to 2.5 times larger than the radius R1 of the commutator contact surface.

Abstract: A homopolar dynamoelectric machine is provided with plural independent output terminals for selectable external interconnection to yield a variable output. Each output terminal is associated with a respective pair of rotor conductor and stator conductor. Each rotor conductor and stator conductor is of a generally cylindrical shape. Each stator conductor is further comprised of two separated portions each of a generally cylindrically shape. The rotor conductors and stator conductors are arranged concentrically to each other, and all stator conductors are positioned external to all rotor conductors. The surface of each rotor and stator conductor can be skewed to provide a skewed current flow generating a magnetic field boosting that initially provided in the system. Each output terminal has two connections to each stator conductor, one on each separated portion of the corresponding stator conductor. Each such connection comprises plurals contact areas on a corresponding stator conductor.

Abstract: A worn brush detector 43 for an electric generator. The worn brush detector 43 comprises a contactor strip 55 of electrically-conductive material secured to and insulated from a brush holder 28, the contactor strip 55 having a plurality of fingers 52 projecting downward from the strip 55 and generally perpendicular thereto, the fingers 52 being disposed adjacent to a hole 62 in the brush holder 28 and electrically insulated therefrom. An electrically insulated knob 61 on the opposite end of the fingers 52 projects through the hole 62 such that when a brush 25 is inserted into the holder 28 the corresponding finger 52 is pushed away from the holder by the knob 61 contacting the brush 25. When one of the brushes 25 has worn down a predetermined amount the brush 25 is disengaged from the knob 61 so that the corresponding finger 52 is caused to contact the holder 28 to generate an electrical signal.

Abstract: Electrical brushgear comprises a trapezoidal carbon brush and a frame supporting three sides of the brush, the fourth side of which is supported by a removable clip including a spring exerting a constant pressure on the rear end face of the brush.

Abstract: The brush holding device includes a brush box formed into a tubular shape, having opposite open ends, and being slidably provided in a hollow portion thereof with a brush. A cap is capped onto one end portion of the brush box to block the end portion, and for receiving a reaction force of a brush spring to bring the brush into sliding contact with a commutator. A projecting portion is provided on the cap to engage a portion of the brush box, so that side walls of the brush box can be prevented from deflecting inwardly. A frame portion of the cap may be coupled onto the outer periphery of the rear end portion of the brush box.

Abstract: The motor has a plastic holding member which is a sliding fit in a casing of the motor and which supports at least one pair of segment magnets and brush gear for the motor in a fixed angular position relative to one another.

Abstract: A miniature motor having brushgear comprising brush arms with sliding parts on the tips thereof, terminals and brush bases; the brush bases being supported by a motor case cover plate, when the terminals are inserted in brush holes provided on the motor case cover plate; the sliding parts being brought into sliding contact with a commutator by the resiliency thereof, and characterized in that a flexible photo-setting resin having similar resiliency to the resiliency of vibration-damping rubber is applied to the brush arms to prevent the brushes from unwantedly vibrating during rotation of the commutator.

Abstract: A long-life motor brush holder which significantly minimizes contact of the coil portions of a ribbon spring with the holder and consequently reduces friction drag; the arrangement is such that at least two cylindrical surfaces forming part of the brush holder serve as line contact supports for each of the respective coil portions of the ribbon spring so as to produce minimal contact, the spring including a middle portion for residually engaging the brush to urge it against the motor commutator.

Abstract: The contact surface (8') is constantly urged against the commutator (9) by spring means. The brush material is progressively worn away, without changing the shape of the contact surface (8'), owing to the rotation of the commutator (9). A cylindrical slot (17) separates the outer portion (5') of the brush body (5) from the inner portion (5b) thereof. Thus, the contact surface (8') is kept separated from the cylindrical portion (16') of the outer surface of the brush body as long as the brush material is not worn away to reach the merging zone of the portions (5a) and (5b) of the brush body. This allows a substantial limitation of the risk of sparking between the brush body and the commutator to be achieved, thus avoiding deposit of a carbon layer onto the peripheral surface of the commutator.

Abstract: Brush rigging for a dynamoelectric machine such as an electric cranking motor for cranking an internal combustion engine. A support carries a plurality of radially extending brush holders each of which slidably supports a brush. The brushes are urged radially inwardly by an elastomeric band that is formed of electrical insulating material. The band directly engages the outer ends of the brushes and a plurality of pins that are carried by the support. The pins are located between pairs of brush holders.

Abstract: A plurality of circumferentially spaced, compliant, braided metal filament brushes are mounted by the stator of an acyclic generator for extension from the stator collector surface across the liquid metal collector gap into virtual contact with the rotor collector surface. These brushes are each of an axial length corresponding to the axially lengths of the stator and rotor conductive collector surfaces and serve to effectively block the magnetohydrodynamically induced, counter-rotational, circumferential flow of liquid metal in the collector gap, thus eliminating the component of viscous rotor drag otherwise occasioned thereby.

Abstract: An improved brush gear assembly for use in a miniature motor. The brush gear assembly is mounted within the interior of the end cap of the motor and basically consists of three parts: a terminal element or fitting, a brush leaf element, and a brush. The terminal element consists of a generally planar brass part, a major part of which is defined as an elongated rectangular portion. One end of the rectangular portion defines a bending end. Near the bending end are disposed three staggered projections arranged generally in line adjacent to a transverse bending line formed on the rectangular portion. The leaf spring is formed from a substantially elongated planar copper strip, which has one end terminating in a bending portion. The remainder of the strip constitutes a spring portion and terminates at its other end in a brush receiving portion, which is reinforced by bending the sides in an upward direction.

Abstract: A brush wear detector and indicator for the brush elements contacting the rotating commutator or slip rings of a dynamoelectric machine includes, in addition to a self winding bias spring located on the brush holder for applying force to the brush assembly, a permanent magnet, located either on a brush element or the bias spring, and a reed switch located on the brush holder adjacent the assembly. The magnet moves inwardly as the brush element wears and actuates the read switch at a point indicative of a worn condition. Activation of the reed switch causes an indicator such as a lamp to become energized, signalling a need for brush element replacement.

Abstract: A homopolar dynamoelectric machine is provided with current collecting structures which produce a peripheral, circumferential component of load current for self-excitation. The current collection structures include brush boxes which are skewed at a first angle with respect to the rotor axis and a generally cylindrical stator conductor having slits which are skewed at a second angle with respect to the rotor axis. Current flowing in the brushes and stator conductor is forced to have a circumferential component which compensates for rotor saturation due to load current and minimizes the voltage droop characteristic of drum-type homopolar generators.

Abstract: A homopolar dynamoelectric machine is provided with a rotor having a central axis and being mounted for relative rotation with a stator structure that supports a field coil encircling the rotor and has a main pole piece for directing magnetic flux produced by current flowing in the field coil into a first section of the rotor. Brush assemblies which are capable of making sliding electrical contact with a current collection zone of the rotor extend longitudinally adjacent to that current collecting zone and include a plurality of contact elements. These contact elements are packed in an increasing density in a longitudinal direction from one end of the brush assembly to the other end. The use of a variable packing factor for the contact elements of the brush assembly results in more uniform heating of the rotor in the current collecting zone, thereby minimizing the peak rotor temperatures and permitting the machine to operate for longer time periods.

Abstract: Brushgear for miniature motors comprising a pair of brushes each having brush shoes, made of electrically conduction metal strips, for making sliding contact with a miniature motor commutator, in which each brush shoe is bent into a V shape in cross section; ends of the feet of the V-shaped brush shoe being adapted to make sliding contact with the commutator, and the sliding positions of the brush shoes of the two brushes are disposed apart from each other by a predetermined distance in the axial direction of the commutator and/or in an inclined state in the axial direction of the motor rotating shaft at a predetermined angle with respect to the tangential direction of the commutator.

Abstract: A solderless electrical connection between a wire and an electrical contact forming part of a permanent magnet motor. The motor includes a generally U-shaped motor frame that defines an open volume within which is mounted a plastic spacer or insert and a pair of opposed permanent magnets and that surround a rotating armature. One end of the armature terminates in a shaft which is received within a bushing that is mounted at the center of the planar central portion. The other end of the armature terminates in a shaft. Next to the armature and mounted on the shaft is a commutator. The shaft passes through a metallic bushing that is defined as part of a non-conductive insert which mates with the motor frame. Also mounted on the non-conductive member are a pair of brush assemblies. Each brush assembly basically consists of a pair of planar, opposed parallel legs that are joined together by a planar portion.

Abstract: A brush assembly for use in a homopolar dynamoelectric machine includes a plurality of contact elements extending into slots of a movable brush holder. Resilient tubular members extend through each of the brush holder slots and lie adjacent to the bottom of the slots. The brush holder is movable with respect to a brush box that includes an array of openings positioned to receive the contact elements. An actuating rod for moving the brush holder with respect to the brush box and projections, on opposite sides of each slot, for retaining the contact elements within the brush holder slots are also provided. When the brush holder is lowered such that the contact elements make sliding electrical contact with the surface of a rotating rotor of the homopolar machine, the resilient tubular members provide a spring force which keeps the contact elements in intimate sliding contact with the rotor surface.

Abstract: A sealed enclosure surrounding the brushes and metallic contact members of a dynamoelectric machine is maintained at a positive pressure with an inert gas. A predetermined vapor pressure of a silicone lubricant is maintained in the sealed enclosure. The silicone lubricant mixes with a carbon film on the surface of the metallic contact members to produce a highly lubricating, low-resistance layer which improves the wear resistance and predictability of wear of the carbon brushes.

Abstract: The present invention relates to a brush-holder for flat-commutator electromechanical transducer.The brush secured by screws (11) to the flange (2) of the transducer consisting in this case of a motor having a flat rotor (5) comprises a supporting ring (12) and guide sockets (13). The sockets (13) and the brushes (14) have the shape of a circular arc segment. The socket end opposite the end facing the commutator (6) is closed by a cover (16) screwed in the socket (13). The cover (18) is attached to a coil spring (19) secured in turn to the brush (14). Access to the end of a socket (13) closed by the cover (18) can be had by removing a plug (17) of the stator cage (16) of a device coupled to the motor.

Abstract: A brush holder assembly for use in an electric motor or generator has an insulating ring one side of which carries a set of several equidistant carriers for brushes which are biased in the radial direction of the ring to bear against a slip ring or against a commutator. Each carrier is radially adjustably secured to the ring by two screws or bolts and nuts whose shanks extend through two elongated slots provided in a flange-like extension of the carrier. Each extension has a tongue extending into a radial groove in the one side of the ring. The axial position of each carrier relative to the ring can be changed by inserting one or more shims between the extension and the ring.