Abstract: A miniature d-c motor comprising a case on the inner circumferential surface of which a permanent magnet is mounted, a rotor consisting of an armature and a commutator, and a case cap on which brushes and input terminals are mounted; the rotor being supported via bearings provided on the case and the case cap, in which the miniature d-c motor is housed in a hermetically-sealed internal space defined by the hermetic case formed into a bottomed hollow cylindrical shape and the hermetic case cap fitted to an open end of the hermetic case, and an output shaft connected to a rotor shaft via a magnetic coupling is rotatably provided outside the bottom of the hermetic case.

Abstract: A contact structure for toy motors in which a battery case housing a battery and a motor case housing a motor are detachably and relatively rotatably joined by means of the outer circumferential surface of the end of the battery case and the inner circumferential surface of the end of the motor case, and terminals are provided in the vicinity of the ends of both cases in such a manner that the terminals can be brought into contact with, or separated from each other, characterized in that the cross-sectional shape of the ends of motor terminals provided on the motor case is formed into a U shape having a closed end on the side of the outer circumferential surface thereof, with the end thereof on the side of the axial line of the motor being opened, and the inside surfaces of the battery terminals are brought into contact with the outer circumferential surfaces of the closed ends of the motor terminals.

Abstract: A miniature motor comprising a housing made of a metallic material, formed into a bottom hollow cylindrical shape, and having a permanent magnet on the inner circumferential surface thereof, a rotor consisting of a commutator and an armature facing the permanent magnet, and an end plate fitted to the opening of the housing and having brushes for making sliding contact with the commutator and input terminals for electrically connecting to the brushes; the rotor being rotatably supported by oil-impregnated bearings fixedly fitted to bearing retainers each provided on the bottom of the housing and the endplate; in which a plurality of local projections are provided on the inside end faces of the bearing retainers, and the oil-impregnated bearings are positioned and held in place by bringing the end faces of the oil-impregnated bearings into contact with the local projections.

Abstract: A miniature motor in which female terminals are substantially embedded in an end cap, and brush arms and the female terminals are electrically connected to each other via internal terminals provided on the inside end face of the end cap; the female terminals are formed into a substantially h longitudinal section; contact ridges for making contact with male terminals to be connected are provided on both sides of the opposed inside surfaces of the female terminals in such a fashion as to protrude in a longitudinally staggered arrangement; the bifurcated ends of the female terminals face the outside end face of the end cap; and the area near both ends of the female terminal in the longitudinal direction is supported by the inside surface of a hole provided on the end cap.

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 terminal device for miniature motors includes a stator having a field-forming permanent magnet in the inner circumferential surface of a motor case, a rotor having rotor windings wound on a rotor core, and terminals on a case lid made of a synthetic resin. A power-feeding terminal has terminal insertion holes into which insertion-type power-feeding terminals are inserted, and projections are provided which resiliently engage against the terminals and push the terminals. The power-feeding terminals resiliently engage the terminals at locations where the terminals engage against the projections when the power-feeding terminals are inserted along the projections into the terminal insertion holes of the power-feeding terminal.

Abstract: A motor output shaft positioning device for motors with worm reduction gears for outputting the output of a motor output shaft via a worm reduction gear, comprising a gear case having a hollow part for housing a worm fitted to a motor output shaft and a worm wheel meshing with the worm and receiving an end of the motor output shaft; the hollow part receiving a bearing of the motor output shaft and a steel ball; a bearing holder having projections projecting towards the bottom of the hollow part, and a filler that is injected into the hollow part through a filling hole formed on the hollow part.

Abstract: A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; an a rotor comprising a rotor winding wound on a rotor core; electric current being fed to the rotor winding via a commutator making sliding contact with current feeding brushes that are held by brush holders fixedly fitted to the end plate; in which cogging during motor rotation is reduced to make motor rotation smooth by forming a magnet that has at the magnetic poles thereof higher maximum magnetic energy product than any other regions.

Abstract: An ac motor comprises a dc micromotor with terminals passing through an insulating end bell to receive dc current from a rectifier module. The flat surface of the end bell contains fixing grooves and a hole. The rectifier module is fitted within the hole. Fixing bosses are also provided on the end surface of the end bell. An input terminal plate is provided with holes for engaging the four bosses. The input terminal plate is provided with cut grooves which delimit four input terminal portions. The input terminal plate also has a middle hole. The input terminal plate is pressed into engagement with the four bosses resulting in the input terminal plate separating into four input terminal pieces, which are bent into the fixing grooves and also bent into the hole to fixedly fit the input terminal pieces to the end bell. Terminals of the rectifier module are electrically and mechanically connected to be held by the input terminal pieces.

Abstract: A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; and a rotor comprising a rotor winding wound on a rotor core; electric current being fed to the rotor winding via a commutator making sliding contact with current feeding brushes that are held by brush holders fixedly fitted to the end plate; in which cogging during motor rotation is reduced to make motor rotation smooth by forming a magnet that has at the magnetic poles thereof higher maximum magnetic energy product than any other regions.

Abstract: A miniature motor driven by a full-wave or half-wave rectified power source, having a stator of a two-pole field system using a permanent magnet as magnetic poles, a rotor comprising a winding wound on a four-pole core, and noise-suppressing capacitors disposed between adjoining core arms of the four-pole core of the rotor.

Abstract: A carbon brush for miniature motors comprising a stator using a permanent magnet as the field, and a rotor on which a rotor winding is wound, and having a commutator for feeding current to the rotor winding and brushes, formed by bonding graphite powder, for making sliding contact with the commutator; the brush being a metal-plated graphite brush formed by adding 0.1 wt. % to 12.0 wt. % of a fibrous material of particle sizes less than 40 microns and lengths less than 50 microns to metal-plated graphite powder formed by coating graphite powder with a metallic layer, and pressure-forming and sintering a mixture of the metal-plated graphite powder and the fibrous material; the graphite powder containing less than 0.05 wt. % of ashes, and the method of making the same.

Abstract: A carbon 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 carbon brush is a metal-plated graphite brush formed by pressure-forming and sintering the graphite powder after covering particles of the graphite powder with a metallic layer; the graphite powder used for the metal-plated graphite brush being purified to reduce the ash content of the graphite powder to 0.05 wt. %, and the method of making the same.

Abstract: A bearing device for miniature motors having a cylindrically-shaped bearing support formed by pressing an end face of a metallic motor case, and a bearing press-fitted into the bearing support to rotatably support a motor shaft, characterized in that a pressed groove is formed on the outer circumferential surface of the bearing support by pressing the outer circumferential surface is disclosed. A method of making a bearing device for miniature motor in which the clearance between the bearing and the motor shaft is set by pressing the outer circumferential surface of the bearing support using a pressing jig in a state where the motor shaft is inserted into the bearing is disclosed.

Abstract: A rotor for miniature motors having a shaft serving as a rotating shaft, a commutator having commutator segments mounted on a commutator proper fixedly fitted to the shaft, a rotor core fixedly fitted to the shaft and having rotor windings wound thereon, a plurality of positioning bosses formed in such a manner as to protrude toward the side of the rotor core on the commutator proper, and a positioning groove, formed on the side surface of the rotor core, into which the positioning bosses are inserted; the commutator being fixedly fitted by press-fitting the positioning bosses into the positioning groove, characterized in thatpositioning grooves which are formed on the side surface of the rotor core, and smaller in number than the number of the positioning bosses,a long positioning boss, among a plurality of the positioning bosses, having a sufficient length to be press-fitted into the positioning grooves,other short positioning bosses having a length at least equal to the thickness of an insulating core fitt

Abstract: A rotor insulating core for miniature motors comprising a stator having a field-forming permanent magnet, a rotor having a rotor winding wound on a rotor core fixedly fitted to a motor shaft; an insulating core being disposed on the surface of the rotor core; and the rotor winding being wound on the rotor core via the insulating core, in which the insulating core consists of an insulating end-face portion covering the end face of the rotor core and an insulating rib covering the side of the rotor core; both being integrally formed; the insulating rib is formed in such a fashion as to have a thickness smaller than the insulating end-face portion and a predetermined length, and disposed in such a manner as to cover the rotor core on which the rotor winding is wound.

Abstract: A miniature motor with a revolution-detecting generator, the motor having a stator formed by a permanent magnet on the motor housing and a rotor consisting of a winding on a core. Electric current is fed to the rotor winding via current feeding brushes and a commutator. A revolution-detecting generator comprising a frequency-detecting coil for receiving changes of magnet flux made by teeth on stator and rotor components generates an induced voltage proportional to the revolution of the rotor, in which a noise-suppressing coil wound in a lapped state with the frequency-detecting coil is provided. The noise-suppressing coil and the frequency-detecting coil are connected with each other in a reverse phase, and the noise-suppressing coil is connected in parallel with the frequency-detecting coil via a high-pass filter connected in series.

Abstract: A miniature motor having a frequency generator comprising a miniature motor consisting of a stator equipped with a permanent magnet for forming a magnetic field, and a rotor having windings wound on a rotor core, constructed so as to feed electric current to the rotor windings through a commutator which makes sliding contact with current-feeding brushes held by a brush holder fixedly fitted to a small motor case. A frequency generator is provided consisting of a rotor for detecting revolution, a stator disposed in such a manner as to face the rotor, a permanent magnet for forming a magnetic field between the rotor and the stator, and a frequency-detecting coil generating an induced voltage proportional to the revolution of the rotor.

Abstract: A miniature motor comprising a stator having a permanent magnet field fitted to the inside of a motor case, a rotor having a rotor winding and rotatably supported in such a manner as to face the stator, a commutator provided at an end of the rotor, and a cooling fan, in which a plurality of lugs are provided in a projected state on an end face of a core constituting a rotor end portion, a plurality of holes corresponding to the lugs are provided on the cooling fan having a plurality of vanes, and the cooling fan is fixedly fitted to the core and then secured in place by plastic deforming of the lugs.