Abstract: A miniature motor comprising a housing formed into a bottomed hollow tubular shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, a rotor facing the permanent magnet and comprising an armature iron core having a coil wound thereon and a commutator, an end plate fitted to an open end of the housing and having brushes coming in sliding contact with the commutator and input terminals electrically connected to the brushes, and a cooling fan provided between the armature iron core of the rotor and the commutator; the rotor being rotatably supported by bearings provided on the bottom of the housing and the end plate, in which an integral cooling fan is formed by providing a plurality of fins at circumferentially equal intervals between first and second fan rings fitted to the ends of the commutator and the armature iron core, respectively, and a plurality of bosses are provided on the end face of the second fan ring.

Abstract: An improved spindle motor, particularly for a hard-disc drive, having a stator in the form of a cylindrical coil carried by a mounting plate and a permanent magnet rotor carried on a rotatable hub. At its outer circumference the rotor generates a field perpendicular to the axis of rotation. A bell-shaped portion of the hub surrounds the coil. The hub is supported on the motor shaft by axial and radial hydrodynamic bearings. A soft-iron sleeve-shaped yoke externally surrounds the coil configuration. This permits the coil to be free of soft-magnetic parts, thereby reducing its inductance and improving the dynamic drive characteristics of the motor. The coil is preferably formed by curved foil windings, so there are no winding slots. This avoids the production of detent torques.

Abstract: A spindle motor comprises a stationary shaft, a rotor hub having an annular rotor magnet and rotatably mounted by bearings to the stationary shaft, a stator fixedly mounted to the stationary shaft so as to face the rotor magnet, a flexible printed circuit board connected to leads from the stator, and a reinforcement member composed of an annular plate portion and a tubular portion extending axially from the inner edge of the plate portion and disposed between the stationary shaft and the stator. For assembly, the stator is fitted onto the outer side of the tubular portion and then, the flexible printed circuit board is mounted to the plate portion of the reinforcement member. The tubular portion of the reinforcement member is joined to the outer side of the stationary shaft. Accordingly, the flexible printed circuit board is strengthened effectively and the assembly of the components will be eased.

Abstract: An optical apparatus having a light-quantity control device includes:a) a rotating member having a plurality of magnetic poles;b) a stator having a plurality of magnetic pole sections opposed to the rotating member;c) a coil for exciting the stator;d) an input device for inputting driving speed information as the driving speed of the rotating member;e) an output device for outputting to the coil a driving signal for rotatably driving the rotating member less than one full rotation thereof on the basis of the driving speed information;f) a detecting device for directly detecting a movement state of the rotating member and outputting a detection signal which varies approximately linearly with the position of the rotating member representing movement state information;g) a forming device for forming rotating speed information of the rotating member from the detection signal;h) a correcting device for correcting the driving speed information by the use of the rotating speed information, the correcting device prov

Abstract: The invention relates to a disc (10) for the magnetic circuit of an electrodynamic motor with a central opening (12) and segments (14, 16) disposed about said opening (12), said segments having radially aligned legs (18, 20) and if necessary peripherally-extending arms (22, 25), said legs defining winding grooves (30) radially accessible from the exterior with openings (32) formed in the region of the free radial ends of the legs (20). The openings (32) may be closed by bending the legs (18, 20) and/or the arms (22, 24) (FIG. 1 ).

Abstract: A drive member of the device is made of electrically conductive non-magnetic material, supported rotatably or movably straight and uniform in wall thickness and width. An outer magnetic member and an inner magnetic member are arranged respectively at the outer side and the inner side of the drive member which are orthogonal to the direction of movement thereof. At least one of the outer and inner magnetic member has at least three magnetic poles to provide closed magnetic circuits extending from the respective poles and penetrating the drive member and the magnetic members along a round path. The poles have a width less than that of the drive member and are arranged centrally around the drive member, so that the drive member has edge portions which are not opposed to the poles, at opposite sides thereof which are orthogonal to the direction of movement.

Abstract: A front frame and a rear frame of an alternator house a rotor and a stator therein and are secured by through bolts and nuts to each other in an axial direction at supports which are formed on the circumferential portion of the frames. Cooling air intake windows are formed on the end surfaces of the frames and cooling air discharging windows are formed on the circumferential surfaces of the frames. Window ribs formed between the discharging windows are arranged so that the ribs adjacent to the supporting portions have a width which is greater than the width of other ribs, thereby providing sufficient rigidity to suppress resonant vibrations and the generation of magnetic noise which occurs when the armature reaction of the alternator is transmitted from the stator to the entirety of the frames.

Abstract: A hybrid alternator comprising a stator, and a rotor mounted for rotation within the stator and separated therefrom by an air gap. The rotor has a rotor core defining a plurality of magnetic poles wherein adjacent ones of the magnetic poles having alternating north and south magnetic fields. The plurality of magnetic poles comprises a plurality of permanent magnet poles and a plurality of electromagnetic poles. Each permanent magnet pole is defined by a permanent magnet. The plurality of permanent magnet poles comprises two (2) sets of diametrically positioned permanent magnet poles. Each permanent magnet is positioned within the rotor perimeter and associated with a pair of adjacent magnetic poles to form adjacent permanent magnet poles.

Abstract: An electric motor, which is housed with a pulse signal generator for generating a pulse signal according to rotation of an output shaft and the pulse signal generator is composed of a plate provided with a conductor plate having a plurality of conductive parts disposed annularly with predetermined spaces and a contactor to be a contacted slidingly with the conductive parts of the conductor plate.

Abstract: A multi-pole, multi-speed brush holder assembly is created by joining a first speed brush holder assembly and a second speed brush holder assembly together, back-to-back, with an apertured spacer sandwiched between them. A plurality of brush holders are disposed on the cards' front faces and spaced circumferentially around a central aperture of the respective card. Brushes are guided by the brush holders and spring-biased toward the respective aperture for engaging a respective commutator of a motor armature. On each card, a respective first electric conductor segment is disposed flat against the card's back face and electrically connects the brush of a first of the card's brush holders with the brush of a second of the card's brush holders. On each card, a respective second electric conductor segment is disposed flat against the card's back face to electrically connect the brush of a respective third of the card's brush holders with the brush of a respective fourth of the card's brush holders.

Abstract: A three-phase brushless motor includes a rotary shaft, a rotor fixed to an outer surface of the rotary shaft, and a drive coil of three phases disposed around the rotor. An outer surface of the rotor is magnetized to have alternately and equidistantly arrayed S and N poles and a plural number of low flux density regions are provided in a gap between the outer surface of the rotor and an inner surface of the drive coil.

Abstract: A brake assembly is provided for a motor having an endbell and a hub attached to a shaft. A mounting plate is coupled to the endbell and a spacer is adjacent to the hub. A disc is attached to the hub and is disposed adjacent to the spacer opposite from the hub. A caliper is coupled to the mounting plate and is operable to engage the disc absent a signal and to disengage the disc in response to the signal.

Abstract: A brushless transversal-flux permanent magnet motor has a stator construction that forms a virtual bobbin, so that windings may be simply circumferentially wrapped around the stator, eliminating the need for winding insertion. The stator may be constructed of first and second core structures each having an elongated powdered iron pole piece central portion with end terminations, and integral with a tubular element also of powdered iron. Epoxy, or like non-magnetic material, fills in the volume between the pole piece end terminations to form a disc-shaped structure, the windings wrapping around the tubular elements. A discontinuity is provided on each pole piece and termination to allow start-up. The rotor may be a yoke having permanent magnet rings aligned with the pole pieces, and mounted for rotation by a shaft central of the tubular elements engaging bearings in the tubular elements.

Abstract: A sheet of insulating paper has flat portions inserted between windings that are arranged radially of a stator core, and bent portions extending and bent back radially of the stator core and inserted between windings that are arranged circumferentially of the stator core, the bent portions being positioned between and integral with the flat portions.

Abstract: A flat disk type commutator 1 according to the embodiment comprises: a boss 16 which is formed into a thick approximately disk-shape; a plurality of segments 21, each of which is formed into an approximate sector, which are radially arranged on the surface of the boss 16 with an approximately equally space; a riser bar 4 which is electrically connected to each segment 21, as a conductive base material; slits 20 providing a state in which adjacent segments 21 are insulated from each other. A recess 11 is formed at each segment 21. A projecting portion 6 is formed at the riser bar 4. The projecting portion 6 is inserted to the recess 11 in a state in which a copper powder layer 12 and a solder layer 14 is formed at the recess 11, and is soldered. Each riser bar 4 is in a state to electrically connect with the segment 21 by the copper powder layer 12 and the solder layer 14.

Abstract: Permanent-magnet rotor for electric motors including at least two semitubular permanent magnets which are at least partially embedded in a core made of two-component epoxy resin or plastics. The core is obtained in a mold by molding in place or pouring over a pre-molded casing that contains the magnets, or by pouring so as to form, together with said core, a containment casing.

Abstract: A high precision linear actuator with low hysteresis has an elongate linearly movable drive shaft for controlling a damper. The drive shaft is connected to a drive pad mounting a rack gear. A motor drive is adapted to receive an input signal in the form of an input voltage and converts the voltage into rotation of a motor drive shaft. A drive means is operatively associated with the motor drive shaft output and is in cooperating contacting relation with the rack gear for linearly translating the drive shaft. A position sensor outputs a signal indicating the linear displacement of the drive shaft.

Abstract: An electric driven power tool motor is provided with a conical air inducer for improving the motor air cooling supply from a motor driven impeller.

Abstract: An eccentric-motion motor for driving a utilization mechanism includes a stator defining a closed surface pathway, an armature composed of a permanent magnet rollably disposed on the closed surface pathway, a series of electromagnetic elements disposed in the stator along the closed surface pathway, circuitry for successively energizing the electromagnetic elements to cause them to attract and/or repel the armature so that it rolls along the closed surface pathway, and a coupler mechanism for coupling the armature to the utilization mechanism so that as the armature is caused to roll, the utilization mechanism is powered by the operation of the motor.

Abstract: An eccentric-motion motor for driving a utilization mechanism includes a stator defining a closed surface pathway, an armature composed of a permanent magnet rollably disposed on the closed surface pathway, a series of electromagnetic elements disposed in the stator along the closed surface pathway, circuitry for successively energizing the electromagnetic elements to cause them to attract and/or repel the armature so that it rolls along the closed surface pathway, and a coupler mechanism for coupling the armature to the utilization mechanism so that as the armature is caused to roll, the utilization mechanism is powered by the operation of the motor.