Asmo Co., Ltd.

Nobuo Kasao

Ryohei Kageyama

Toshiyuki Osawa

Yuichi Terada

Kazunobu Kanno

Yoshiki Nakano

Toshihiro Tanino

Yuuichi Terada

Kengo Ozawa

Toshiyuki Ohsawa

Coils are electrically connected to a commutator, which includes commutator segments that are arranged one after another in a circumferential direction of a dielectric body along an outer peripheral surface of the dielectric body. Each commutator segment includes a slidably contacting portion, a claw portion and a bending fulcrum portion. The slidably contacting portion is provided in one axial side of the commutator segment and is slidably contactable with each brush. The claw portion is provided in the other axial side of the commutator segment and is engageable with the corresponding coil. The bending fulcrum portion is formed on a claw portion side of the slidably contacting portion and is bent upon radially inwardly pressing the claw portion by a fusing electrode.

Manufacturing method of electric motor

A short-circuit member includes a short-circuit conductor and a short-circuit insulator. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. Each of the short-circuit member formation groups has outer terminals, inner terminals, and linking portions. The outer terminals contact one another and the inner terminals contact one another between each of the short-circuit member formation groups. The linking portions are maintained in non-contact between each of the short-circuit member formation groups. In a method for manufacturing the short-circuit member, the short-circuit insulator is molded by filling molten resin material between opposing ones of the linking portions in the first and second short-circuit member formation groups, which are superimposed in a mold, along a longitudinal direction of the linking portions so that filled resin material leaks out of gaps between adjacent ones of the linking portions in a thicknesswise direction of the linking portions.

Method for making a short-circuiting member and method for making a commutator

A commutator main bodyincludes a plurality of commutator piecesarranged along a circumference, the center of which is a rotation axis L of a motor, and a main body insulatorholding the commutator pieces. A short-circuit memberis arranged on an end portion of the commutator main bodyand includes a short-circuit conductor, which short-circuits predetermined ones of the commutator pieces, and a short-circuit insulator, in which the short-circuit member is embedded. A boss is formed integrally with the short-circuit insulator so as to project from the end portion of the commutator main body.

Commutator and an armature

A commutator including a commutator main body having a plurality of commutator pieces and a short-circuit member having a short-circuit conductor for short-circuiting commutator pieces. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. The first short-circuit member formation group is thinner than the second short-circuit member formation group. The first and second short-circuit member formation groups are fixed to each other by crimping projections, which are formed on the second short-circuit member formation group through punching, in a state inserted through holes, which are formed in the second short-circuit member formation group.

Commutator and armature

A commutator includes a generally cylindrical dielectric body and a plurality of commutator segments arranged along an outer peripheral surface of the dielectric body. Each commutator segment includes a ridge, which extends in a direction generally parallel to an axial direction of the commutator and radially inwardly projects into the dielectric body to secure the commutator segment relative to the dielectric body. Each ridge includes alternately arranged high projecting portions and low projecting portions. Each high projecting portion includes grooves, which are obliquely angled relative to the longitudinal direction of the ridge, and protrusions, each of which is bound with one of the grooves and protrudes in an imaginary plane generally perpendicular to the projecting direction of the ridge.

Commutator, manufacturing method of commutator, manufacturing apparatus of commutator and commutator plate material

In a commutator forming plate to be rounded into a cylinder which is to be cut at constant angular intervals to form a plurality of commutator segments after being filled with insulating material, a plurality of lands rising at given intervals on one surface of a plate is provided and a plurality of projecting portions protruding nearly perpendicular to a rising direction of each of the lands are formed simultaneously by forming a plurality of grooves crossing with each other on the respective lands and extending so as to intersect obliquely with respective outer peripheries of the lands.

Growing community of inventors

Kosai, Japan

Nobuo Kasao