Abstract: A co-axial cylindrical brushless DC motor has an internal cylindrical stator and an external rotor containing permanent magnets. The cylindrical stator has a substrate of reinforced plastics covered by several layers of helically wound annealed steel wire of about 1 mm diameter to provide a cylindrical magnetic layer of soft magnetic material just below the wound poles on or adjacent the outer surface of the stator.

Abstract: This transducer comprises a rotor (18) and a stator (2) having at least three magnetic poles (12a, 12b, 12c) each terminating with a polar lug (24a, 24b, 24c). The polar lugs are connected together by magnetic flux guide branches (8a, 8b, 8c) each bearing an excitation coil (10a, 10b, 10c). The stator is made up from two principal parts (4, 6) situated for the most part in two different planes while the magnetic flux guide branches (8a, 8b, 8c) are situated in a region between such planes. This transducer exhibits a compact structure and may be inexpensively manufactured by simple blanking of the stator parts. In particular it finds application in the driving of small dimension precision mechanisms such as timepieces.

Abstract: A brushless motor comprises a rotor which is rotatable on an axis of the brushless motor and which include permanent magnets arranged circumferentially thereon, an output member connected to the rotor to rotate with the rotor, and a stator which includes electro-magnetic coils energized in order to rotate the rotor, and has a first space which receives the output member therein and a second space which extends from the first space to the outside of the stator so that an output power of the brushless motor is transmitted from the output member to the outside of the brushless motor through the second space.

Abstract: A current rectifier-excited synchronous electrical machine includes a rotor defining an axis of rotation. The rotor includes a rotor shaft, a stator housing, and a central disk. The rotor shaft is mounted in the stator housing. The central disk extends radially outward from the rotor and defines an outer circumference. At least one ring-shaped pole structure is secured to the disk outer circumference and disposed coaxial to the axis of rotation. The pole structure includes a plurality of permanent magnets, soft iron elements and insulators. The permanent magnets and soft iron elements are disposed in interleaved fashion. The insulators are formed of magnetically and electrically nonconductive material and are disposed between each of the magnets and iron elements. The magnets, iron elements and insulators are disposed in two side-by-side rows. Each pole structure is opposed by a stator assembly comprising an outside stator and an inside stator.

Abstract: An attentuating voltage-follower circuit has an input stage that buffers an input voltage signal, which varies about a reference voltage, to form an intermediate voltage signal without a DC level shift. A reference stage sets a pivot voltage which is equivalent to the reference voltage so that an attentuated voltage signal can be generated in response to the difference in voltage between the intermediate voltage signal and the pivot voltage across a simple voltage divider stage. The voltage difference between the intermediate voltage signal and the pivot voltage generates a divider current which flows through the voltage divider stage. The divider current, if uncorrected for, would shift the DC level of the intermediate voltage signal. A correction stage senses the magnitude and direction of the divider current and both sources a compensation current and sinks a buffer current which offsets the divider current, thereby eliminating the DC level shift produced by the divider current.

Abstract: An electromechanical exciter for use in driving a vibratory conveyor includes a non-linear spring system which provides an increase in spring force as the stroke of the electromagnet increases.

Abstract: A miniature motor comprising a case 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 case and having input terminals, and a rotor rotatably supported by bearings provided on the case and the end plate; power being fed from the input terminals to the rotor via printed-circuit boards, in which a connector-unit body is fixedly fitted to an outer end of the end plate; the connector unit having such a construction that connector pins formed of a metallic material into a strip shape and having retainer pieces for printed-circuit boards and contactor pieces for input terminals are fixedly fitted to a connector-unit body made of an insulating material and formed into a plate shape, and insertion holes are provided in the vicinity of the retainer pieces so that the printed-circuit boards and input terminals can be electrically connected by inserting the printed-circuit boards into the i

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 device for driving an elevator at the time of a service interruption according to the present invention has a circuit for varying d-axis magnetic flux command to prevent regeneative power that can damage the elements in an inverter from being generated at the time of an interruption eliminating the need for a regenerative power consumption circuit.

Abstract: A press-molded collector shoe having a body made of a first carbon piece, and a layer disposed on a side thereof made of a second, less conductive carbon piece. The second piece covers only a portion of the side of the collector shoe. An electrical lead projects from a portion of the side which is not covered by the second piece. During the production of the collector shoe the surface layer is pre-pressed in a separate step and the first carbon piece into which the lead wire is imbedded and the second piece are then pressed together.

Abstract: A stator yoke is configured for engaging with similarly configured stator yokes of a stepping motor. The stator yoke comprises a cylindrical ring made of a magnetic material and has a first annular edge and a second annular edge. A plurality of tooth poles are integrally formed with the cylindrical ring and are disposed in spaced-apart relation along the first annular edge. The plurality of tooth poles are engageable with a plurality of tooth poles of a similarly configured stator yoke of the stepping motor. The stator yoke has a plurality of locating protrusions integrally formed with the cylindrical ring and disposed in spaced-apart relation along the second annular edge. The plurality of spaced-apart locating protrusions are engageable with locating protrusions of a similarly configured stator yoke of the stepping motor or with a support plate of the stepping motor. The locating protrusions accurately ensure the relative angular position of tooth poles between adjacent phases of the stepping motor.

Abstract: A method and system for controlling a dual output power converter of the type having a pair of input terminals connectable to a source of rectified AC power of variable voltage amplitude, a boosting circuit including a secondary winding of a boost transformer operatively coupled in circuit with the pair of input terminals for providing a boosted voltage onto a DC power bus, and a full-bridge inverter including at least one controllable switching device serially connected in each leg of the inverter. The inverter has an input connected to the DC bus and a pair of output terminals connected to respective ends of a primary winding of an output transformer, at least one of the pair of output terminals being connected in circuit with the primary winding of the boost transformer.

Abstract: A brush cooling system for a direct current electric motor of the type having a housing with an air inlet at one end for admitting forced cooling air to the motor and brushes located at an end of the motor distal from the air inlet, includes at least one air duct extending from the air inlet end of the motor through a space defined by adjacent stator windings of the motor and terminating at about an end of the windings opposite the air inlet end. A convergent nozzle is releasably connected to the terminating end of the air duct and extends from the air duct to an area generally adjacent the motor brushes for directing cooling air from the duct onto the brushes. Field coils of the stator windings are separated by air spaces and the air ducts extend through the air spaces between field coils. Each air space not including an air duct is substantially blocked by a baffle inserted in the space for inhibiting air flow through the air space.

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 frame and magnet assembly for a dynamoelectric machine. The assembly includes an imperforate frame member formed of metallic magnetic material. A one-piece tubular imperforate stainless steel magnet supporting part is disposed within the frame. The magnet supporting part has pockets that contain permanent magnets. The opposite ends of the frame have annular chamfered or tapered surfaces which intersect a tubular inner surface of the frame to define annular ridges. Annular end portions of the magnet support are bent into engagement with the tapered surfaces on the frame to thereby provide ridges on the magnet support that are aligned with the ridges on the frame. The ridges on the frame are welded to the ridges on the magnet support by a welding current that is supplied to a pair of welding electrodes that respectively engage the ridges on the magnet support. The welding electrodes have annular tapered surfaces which have line contact with the ridges on the magnet support.

Abstract: A composite bearing structure can withstand high speed rotation has first, second and third bearing components. The first bearing component supports a radial impact force applied to a rotator during rotation, and is made of an inner ring (1) and an outer ring (2) of silicon nitride ceramic sintered bodies. The second bearing component supports an axial load applied to the rotator while maintaining a required clearance between itself and the rotator and is made of two permanent magnets (12, 13) positioned thrustdirectionally opposite to each other. The third bearing component maintains a radial rotational accuracy of the rotator, and is made of a radial dynamic pressure producing groove (5) provided on a cylindrical surface of the inner ring (1).

Abstract: In a stator-excited synchronous machine with laminated sector stator elements (SS1 or SS2), which are arranged one behind another at an axial distance and are winding-excited by in each case one excitation winding part (EW1 or EW2) of opposite polarity, the operating efficiency can be increased with low outlay when a permanent magnet arrangement (M) having a magnetization opposing the winding excitation in the sector stator elements is provided in the axial spacing chamber between the sector stator elements (SS1 or SS2); in order to lock the position of the magnet arrangement (M), the facing laminations of the magnet arrangement (M) have bent-away tongues (Z) gripping radially from below.

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: An endshield/endshield cover assembly for an electric motor includes and endshield having a base, a circumferential wall extending upwardly from the base, and a protrusion extending outwardly from the base wall. The endshield cover has a circumferential wall extending downwardly from a top. The cover wall defines a hole which is sized and shaped to fit over the projection. By aligning the endshield cover hole with the endshield projection, the endshield cover may be pivoted into place and secured with only one screw.

Abstract: A homopolar machine for producing high voltage, direct current. The machine comprises a stator which supports the homopolar machine, a plurality of excitation coils disposed within the stator for producing magnetic flux so that the homopolar machine can produce direct current when in operation, a rotor rotationally disposed within the excitation coils for rotating through the magnetic flux when the homopolar machine is in operation to produce direct current, and a coil of a single length continuous conductor element disposed about the rotor such that a plurality of rotor conductor segments are formed wherein successive ones of the plurality of conductor segments are electrically connected such that an induced voltage and direct current are produced in the coil when the rotor and coil traverse through the magnetic flux during homopolar machine operation. Homopolar machines described herein are useful in a wide range of applications, operate with high voltages and allow straight transformation of a DC voltage.