Abstract: In order to achieve high potency for magnetic circuits together with a favourable possibility of constructing them in four-phase and two-phase form using radially positioned permanent magnets in flux concentration mode, it is proposed to introduce E-shaped stator pole elements with at least one fanned-out limb each. This gives the most favourable utilisation of the permanent magnets together with high functionality with a view to the maximum obtainable rotor diameter and favourable component manufacture. Both four-phase and two-phase machines may be constructed with the same pole elements. For exclusively two-phase windings there is a possibility of shortening the distance between the part-rotors.

Abstract: Hard magnetic poles made of a permanent magnet and soft magnetic poles are alternately disposed on the periphery of a cylindrical rotor of a permanent magnet type synchronous motor. The arcuate length of the hard magnetic poles is equal to that of the intervals between the hard magnetic poles, thereby enabling an increase in the ratio of reluctance torque. Therefore, the number of permanent magnets used can be reduced, making production economical, and a back electromotive force can also be lowered. Further, one magnetic pole consists of six slots, and the arcuate length of hard and soft magnetic poles corresponds to a 3-slot pitch, thereby enabling a reduction in cogging torque.

Abstract: A brush holder clip and connector for motors and generators is provided in the form of an integral V-shaped spring steel member having an electrical connector extending from one of the legs thereof and opposite an apex of the clip and connector. The housing containing the commutator has a slot therein through which the brush holder passes. The V-shaped clip and connector is inserted into the slot and wedged between the brush holder and an edge of the slot. The clip and connector is electrically conductive and communicative with the brush holder 22 and is adapted for mating interconnection with a wire or other conductor.

Abstract: An electromagnetic actuator includes a ferromagnetic plate and an electromagnet, both of which have adjacent surfaces with corresponding sloped facets that define a non-uniform gap. A nominal spacing of the gap is maintained by elastomer, preferably located within the gap. The gap spacing between corresponding sloped facets is substantially less than for other portions of the gap and favors flow of magnetic flux. In one embodiment, multiple parallel-connected electromagnets are magnetically coupled to the same faceted ferromagnetic plate such that sloped facets of the various electromagnets and corresponding or matching sloped facets of the ferromagnetic plate are oriented in different directions. A weighted average of the coil currents of the electromagnets determines the net translation of the ferromagnetic plate. The actuators are used in vibration control systems.

Abstract: A dynamoelectric machine having a rotor carrying a field coil has a fan and slip ring assembly formed from a thermoplastic material into a unitary structure. A slip ring portion is axially remote from the fan portion, the two portions being connected by thermoplastic material which is formed to cooperate with the rotor shaft to provide channels for capturing coil leads of the field coil.

Abstract: An electrical motor includes a case having a shaft hole formed therein through which a driven shaft of the motor projects. The case includes an exteriorly disposed cylindrical flange surrounding the shaft hole at a radial distance therefrom. Disposed in a cylindrical recess formed by the flange is a first sealing member which has a sealing hole extending therethrough. The shaft extends through the sealing hole, with the shaft rotatably supported by the sealing hole so that the passage of sand and dust through the sealing hole is essentially blocked. A fixing member is secured by interference fit within the recess to retain the first sealing member in place. A second sealing member secured to an outer surface of the flange by an interference fit includes a wall extending across an outer end of the recess to resist the entry of sand and dust into the recess. The shaft extends through through-holes formed in the fixing member and the wall of the second sealing member.

Abstract: A high-frequency motor comprises a squirrel-cage rotor. The rotor comprises an iron core having a plurality of circular slots, a plurality of conductive rods inserted into the slots, and short-circuit rings disposed at both ends of the conductive rods. The conductive rods are made of copper. A ratio of a product of the number N2 of the conductive rods and a diameter d2 of each conductive rod to an outer diameter D of the rotor is in an optimized range of 1.1 to 1.5, namely, 1.1.ltoreq.N2.multidot.d2/D.ltoreq.1.5. With this optimization, it becomes possible to achieve a maximum rotational speed of more than 120,000 min.sup.-1 and obtain an excellent motor efficiency.

Abstract: Disclosed is an improvement to the stability of D.C. motor brushes mounted in brush boxes with wings is improved by angling the wings toward the commutator such that the brush spring contacts the brush at one or more points intermediate the ends of the brush. Improved cooling is provided by utilizing an end plate with apertures and a brush plate which in combination with the commutator, provides a brush plate aperture for cooling air flow. In a preferred embodiment, speed variations of the motor can be achieved by selectively disconnecting one or more brushes in a four brush embodiment reducing the torque and rotating speed of the motor. In a preferred embodiment, the use of a diode to interconnect same polarity brushes permits a speed change to be accomplished by selectively connecting one or the other end of the diode.

Abstract: A miniature motor comprising a case having a permanent magnet fixedly fitted to the inner circumference thereof, a rotor having an armature iron core and a commutator, and a case cap having power-feeding brushes and input terminals in which a pair of connecting members made of an electrically conductive material are provided on the inner end face of the case cap in a state insulated from brush holders, and a pair of terminals is integrally provided on each of the connecting members and the brush holders; one terminal of the connecting member being connected to the input terminal directly or via other electrically conductive members, the other terminal of the connecting member being connected to a pig-tail wire, and a capacitor being connected across the terminals.

Abstract: The invention relates to a retaining means for magnets of magnetic clutch for pump drives and has an outer rotor receiving magnets on its inner side and an inner rotor receiving magnets on its outer side, the magnets being disposed evenly around the periphery of the rotors, while disposed coaxially of both sides of the magnets are thin annular disks having a number of straps which partially engage over the magnets on the side remote from the rotor, at least one strap engaging over one magnet in each case.

Abstract: An analog-display device, such as a gauge or the like, includes a moveable display member driven by a planar micro-motor. The micro-motor comprises a substrate, a stator for receiving electrical current to generate an electromagnetic field, and a rotor which is rotatable in response to electromagnetic fields generated by the stator. In the stator, a plurality of electrically conductive micro-coils are supported by the substrate and arrayed in a first plane. A plurality of magnetic members is arrayed in the rotor in a second plane substantially parallel to the first plane. The visible display member of the analog display device is mounted for movement by rotation of the rotor body. Analog display devices of the invention can be used in motor vehicle instrument panels, wherein the micro-motor carrying the display member can be mounted, as by cementing, to the display face of the device.

Abstract: In an electric motor the shaft projects beyond the bearing on the closed-end and has a central bore running from this side to close to the drive-end bearing. Centrally in the bore is secured a tube which either extends to close to the end of the bore or is secured in a blind hole in the end of the bore. The tube has a lateral bore in the region of the base of the bore. At the end of the shaft near the closed-end bearing outside the motor housing, a device is secured to the end-plate via which water, used as a coolant, passes into the tube and flows back via the space between the tube and the bore. The tube is held centrally in the bore by two discs, having axial holes, slid over the tube. This construction makes it possible to conduct the heat dissipated in the rotor winding and the rotor, which is transmitted to the shaft, away in the best possible way.

Abstract: A central conductor portion of a coil is formed with a potbelly-shaped cross-sectional form and a flat-shaped face of an insulated coating film of the potbelly-shaped cross-sectional form coil is made thinner than an arc-shaped face of the insulated coating film of the potbelly-shaped cross-sectional form coil. An insulated coating wire having a circular-shaped cross-sectional form is formed to a coil having a potbelly-shaped cross-sectional form by rolling process at a normal temperature. A dead space in a slot is lessened and the magnetic resistance of a magnetic core is decreased, thereby a small size and a high output electric motor can be obtained. A method of forming a rotary armature coil having a high space factor in the slot can be attained.

Abstract: An electromagnetic stepper motor has a drum-type rotor rotatable about an axis and provided with a plurality of permanent magnets distributed over its circumference, a stator surrounding the rotor and comprising a plurality of permanent magnets and an electromagnet provided on each of the permanent magnets of the stator and connectable with a commutator, wherein each of the electromagnets including a plurality of electromagnet members located one after the other in a circumferential direction so that during an interaction of the permanent magnets of the rotor and the electromagnets of the stator the electromagnet members are switched on one after the other.

Abstract: A permanent magnetic rotor is disclosed, which comprises a rotor iron core constructed of a large number of steel plates being layered, each of the steel plates peripherally defining a plurality of sector-shaped blanked holes, and sector-shaped permanent magnetic pieces inserted into the blanked holes, wherein each of the steel plates comprises an outer peripheral ring portion formed on an outer side of the blanked hole, a yoke portion formed on an inner side of the blanked hole, a connect portion formed between the outer peripheral ring portion and the yoke portion, and thin and long fitting protrusions formed at corner portions of the blanked hole in the vicinity of the connect portion, the fitting protrusions protruding to the magnet insertion hole, the fitting protrusions being fitted to the permanent magnetic piece so as to pressure and fix the permanent magnetic piece.

Abstract: An active magnetic bearing utilizing a brushless generator which provides electrical energy to the bearing is disclosed. The use of a brushless generator reduces the size, volume, complexity and cost requirements of the total magnetic bearing system. In the preferred embodiments, the brushless generator provides increased output by utilizing air-core coils in place of ferrous coils in regions of the generator which operate at high frequencies. The air-core coils enable the generator to rotate at speeds in excess of 24,000 rpm while continuing to operate efficiently because core losses, due to the use of traditional iron cores (e.g., hysteresis and eddy-currents), are virtually eliminated. Both radial and axial bearings are provided, as well as a method for maintaining magnetic levitation of a rotating member.

Abstract: A miniature motor including a case formed into a bottomed hollow tubular shape and having a permanent magnet on the inner circumferential surface thereof, a rotor consisting of an armature and a commutator, and a case cover fitted to an open end of the case, and having brushes making sliding contact with the commutator and input terminals electrically connected to the brushes, in which a ground terminal formed into a substantially W shape in planar projected profile, with a U-shaped engaging part provided at the central part thereof for engaging with the case cover, and pinching parts provided at both ends thereof, is interposed between a pair of the input terminals so that one pinching part of the ground terminal forces one of the input terminals in position, and the engaging part is interposed between the case and the case cover.

Abstract: In order to stabilize a body born contactlessly in the magnetic field of a stator, there is a magnetic bearing regulator which influences the magnetic field between magnetizable components in the stator and magnetizable components of the body. The bearing unit consists of at least two electric coils connected in series which, as a pair of coils, act as both a position sensor and an electromagnetic adjuster. In order to attain great reliability with a simple and economical construction, the two outer ends of the pair of coils (2,3) are each connected to an output of an amplifier (4,5) and one of the two amplifiers (5) supplies the inverted output signal of the other (4). A high-frequency signal is applied to the inputs of both amplifiers (4,5) by an oscillator (7) which feeds into the pair of coils (2,3) via the amplifiers (4,5) and received between the two coils via a high pass filter (12) by a phase-sensitive rectifier (8) which is in synchronism with the high-frequency signal from the oscillator (7).

Abstract: Choke coils (5) are attached to the inner part (1) of a two-part end cap assembly by means of first and second leads (9 and 30). Contact means (10) attached to the outer part (6) of the assembly are provided with two slotted plugs which each have two legs. On insertion of each slotted plug in a respective slot formed in the external surface of the inner part (1) of the assembly, the two legs of the slotted plug engage opposite sides of a first lead (9) of one choke coil (5) extending transversely across the slot and bite the opposite sides so as to make good electrical and mechanical contact with the first lead. Both legs of each slotted plug are formed with retaining teeth for engagement with the end walls of the slot into which the slotted plug is inserted, to resist withdrawal of the slotted plug from the slot. This helps secure the inner and outer parts in axial engagement.

Abstract: A motor having a bracket with a stator coil for generating a magnetic field and a rotor hub with rotor magnets for receiving a rotation force from the magnetic field generated by the coil. Upper and lower dynamic pressure radial bearings are formed in between the sleeve and the rotary shaft. The lower end surface of the rotary shaft is formed with a spiral groove in which a lubricating fluid is filled to form a dynamic pressure thrust bearing. The spiral groove is formed by a circular hole at the center of the shaft, and a plurality of curved grooves each curving from the circular hole to the direction opposite to the rotation direction of the shaft and gradually increasing its width toward the outer circumference of the lower end surface of the shaft without reaching the circumference. The spiral groove functions to move the lubricating fluid outward in the radial direction from the center of the shaft, when the shaft rotates.