Mabuchi Motor Co., Ltd.

Ryouichi Someya

Masakazu Ikegami

Toshiya Yuhi

Masahiko Kato

Takahiro Ohtake

Satoshi Suzuki

Kunio Hiromasa

Tsukasa Tsuchimochi

Katsuhiko Katayama

Kenichi Ebashi

Hiroaki Takashima

Junichi Kojima

Katsuyuki Ichikawa

In the present invention, by selecting an optimum combination of plating layer materials or materials, not only the manufacturing cost of motor brush is reduced but also a plating layer having excellent characteristics is formed in a narrow width on the surface of brush base material so as to have a predetermined thickness. The present invention is formed by a brush sliding portion that slides on a motor commutator and a plate-shaped brush base material that is slender as a whole and supports the brush sliding portion. This brush sliding portion is formed by Pd plating portion formed over a predetermined length on a part in the lengthwise direction of the brush base material that supports the brush sliding portion. This Pd plating is applied on the brush base material via backing Ni plating.

Commutating device for small-sized motor and manufacturing method therefor

A miniature motor comprising a case having a positive temperature coefficient resistor incorporated therein and a permanent magnet fixedly fitted thereto, a rotor comprising an armature and a commutator, and a case cap having a pair of power-feeding brushes and a pair of input terminals electrically connected to the brushes, in which a lanced and raised lug or lanced and raised projections are provided at the tip of a retaining member made of an electrically conductive material, a retaining part is formed by bending a part or the whole of the tip of the retaining member toward the side of the lanced and raised lug or lanced and raised projections, the size of a gap between a projection or a lanced and raised lug provided on any one surface of a pair of input terminals, and the retaining part in free state and the lanced and raised lug is made smaller than the thickness of the positive temperature coefficient resistor being inserted therebetween so that the positive temperature coefficient resistor can be inserted into the gap, and the lanced and raised lug or lanced and raised projection can cut into the surface of the electrode of the positive temperature coefficient resistor, resisting the movement of the positive temperature coefficient resistor in the extracting direction.

Miniature motor

A stator for miniature motors having a permanent magnet fixedly fitted to the inner circumferential surface of a housing formed into a bottomed hollow cylindrical shape, in which the circumferential surface of the housing consists of two opposing flat parts and two concave cylindrical surfaces; engaging projections are provided on the flat parts, and flat surfaces coming in contact with said flat parts, and engaging surfaces facing coming in contact with the engaging projections are provided on the axial edge of the permanent magnet made of a flexible ferromagnetic material, and formed into an arc-segment shape in cross section; and the permanent magnet is fixedly fitted in the housing by bringing the arc-segment-shaped outer circumferential surfaces of the permanent magnet in contact with the cylindrical surfaces of the housing, and bringing the flat surfaces on the axial edges of the permanent magnet in contact with the flat parts by causing the engaging projections to cut into the engaging surfaces by the plastic deformation of the engaging projections in a state where the permanent magnet is inserted into the housing.

Stator for miniature motors

A miniature motor includes a case made of metallic material and formed into a bottomed hollow cylindrical shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof. A rotor is provided with an armature and a commutator. A case cap is fitted to an open end of the case and has brushes making sliding contact with the commutator. Input terminals are electrically connected to the brushes directly or via other electrically conductive material. The rotor is rotatably supported by bearings provided on the case bottom and the case cap. Through holes formed into a T shape in cross-sectional profile are provided on the case cap made of a resin material. The input terminals each having a stopper on the lower end thereof and a lanced and raised piece on the central part thereof are passed in the through holes, the lanced and raised pieces are bent to almost right angles with the input terminal surface to fixedly fit the input terminals to the case cap.

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.

Miniature motors end cap brush and terminal assembly

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 that

Rotor for miniature motors

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.

Rotor insulating core for miniature motors

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.

Growing community of inventors

Matsudo, Japan

Ryouichi Someya