Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Tomoki Takahashi

Hideyuki Hayashi

Yoshihito Asao

Hideki Morikaku

Hirokazu Inoue

Yasuhiko Sugitani

Hidehiko Kitahara

Hirokazu Mitsubishi Denki K K Inoue

Provided is a vehicle brushless AC generator capable of improving workability and improving insulation property to enhance reliability while preventing a decrease in slot space factor of a stator coil. In the vehicle brushless AC generator, grooves () are formed in an inner wall of a front bracket (), and a mold body () for insulating and protecting a lead wire () is mounted into the grooves ().

Vehicle brushless AC generator

An object of the present invention is to provide a rotary electric machine for vehicle which can improve workability and efficiently secure an attachment space at low cost. In a rotary electric machine according to the present invention, a terminalis attached on the outside of a rear bracketso as to be overlapped and fitted to a voltage adjustment devicein an axial direction. Fitting portionsandmade of conductors are provided on the voltage adjustment device. Portionsandto be fitted, which are made of conductors, are provided on the terminal. The voltage adjustment deviceand the terminalare integrally fixed to the rear bracket, with the fitting portions being fitted into the portions to be fitted.

Rotary electric machine for vehicle

In An AC generator for a vehicle in which a bearing is inserted into a bearing box formed in a bracket and the bearing is fixed and retained by a retainer, the retainer has a cylindrical shape and a threaded portion is formed on the cylindrical section thereof, a threaded portion is formed on the bearing box, and the threaded portion of the retainer is directly screwed to the threaded portion of the bearing box in order to fix and retain the bearing, so that the gap between the outer circumference surface of the bearing box or the outer circumference surface of the retainer and the opposing side of a cooling fan is made uniform.

AC generator for vehicle

In An AC generator for a vehicle in which a bearing is inserted into a bearing box formed in a bracket and the bearing is fixed and retained by a retainer, the retainer () has a cylindrical shape and a threaded portion () is formed on the cylindrical section thereof, a threaded portion () is formed on the bearing box, and the threaded portion of the retainer is directly screwed to the threaded portion of the bearing box in order to fix and retain the bearing (), so that the gap between the outer circumference surface of the bearing box or the outer circumference surface of the retainer and the opposing side of a cooling fan is made uniform.

A brushless alternator of the present invention includes: a yoke whose inner circumferential surface is radially opposite via an air gap to a rotor revolvably supported by brackets; a stator supported by the brackets, for forming a magnetic circuit along with the rotor and the yoke; a bobbin for engaging with the outer circumferential surface of a thin portion of the yoke; a field coil wound around the bobbin, for producing magnetic flux; and a plate joined to the thin portion, for axially holding the bobbin; wherein the thin portion of the yoke and the other portion thereof are integrally formed in one piece using a single member.

Brushless alternator

The present invention provides an automotive alternator enabling a brush replacement operation to be improved by making a cap covering an opening portion for brush replacement formed in a case insertable to simplify removal and replacement of the cap. A brush holder through which a brush insertion aperture is disposed and into a head portion of which a cover is fitted is disposed inside a case such that an aperture direction of the brush insertion aperture is perpendicular to an axial direction of a shaft, and a brush is disposed so as to be held inside the brush insertion aperture and slide in contact with a slip ring fixed to the shaft. An opening portion for brush replacement is formed in a portion of the case facing the cover, and a cap is insertably mounted to this opening portion.

A brush assembly is constructed such that a brush and a brush terminal are linked by means of a pigtail, a brush spring is disposed under compression between the brush and the brush terminal, and a cylindrical guide is disposed near the brush terminal inside the brush spring.

Dynamoelectric machine and method for mounting a brush assembly to a brush holder

An automotive alternator includes a case, a rotor disposed inside the case, the rotor including a rotor coil and claw-shaped magnetic poles covering the rotor coil, the claw-shaped magnetic poles being magnetized into North-seeking (N) and South-seeking (S) poles by a magnetic flux, a stator including a stator core provided with slots and a stator winding mounted to the stator core, brushes for supplying electric current from an electric power supply to the rotor coil, and a brush holding assembly secured to the case, the brush holding assembly being provided with a cover and a holding portion for holding the brushes within the holding portion, an open portion for removal and insertion of the brushes being formed at a position on the case facing the cover.

Alternator including case with open portion for brush removal

An alternator comprises a brush holding assembly holding brushes within a holding portion and being provided with a cover capable of being opened to remove the brush; and a cap which is disposed on an open portion for removal and insertion of the brush, the open portion being formed at a position on the case facing the cover. The removal and insertion of the brush is performed through the open portion with the open portion opened.

Growing community of inventors

Tokyo, Japan

Tomoki Takahashi