Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Nec Corporation

Hideyuki Hayashi

Tomoki Takahashi

Toshiaki Kashihara

Hirokazu Inoue

Kenichi Takahashi

Keiichi Komurasaki

Katsuhiro Sasaki

Katsuya Akamatsu

Seiya Watanabe

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

An alternator according to the present invention includes: a shaft; a rotor that is fixed to the shaft; a stator that has a stator core that is disposed so as to surround an outer circumference of the rotor and in which a plurality of slots that extend axially are formed so as to be spaced apart circumferentially; and a front bracket and a rear bracket that hold circumferential edge portions of the stator core from two axial ends using a plurality of holding means and that envelope the stator core, a pair of first stays that are formed on the front bracket being fixed to a vehicle by bolts that penetrate through a pair of penetrating apertures that are respectively formed on the first stays, and the pair of penetrating apertures are formed at positions such that an approximate perpendicular bisector of a straight line that connects centers of the penetrating apertures intersects an axis of the shaft; and one of the holding means is disposed on the perpendicular bisector near the shaft. This configuration can prevent generation of magnetic noise without increasing weight in the brackets, in other words, without increasing overall weight.

Dynamoelectric machine

Provided is a rotary electric machine capable of improving cooling performance for a stator coil and a stator core. In the rotary electric machine, an outer-side outer diameter portion () of an exhaust hole () is formed on an inner diameter side of a position which is opposed to an axial-direction side end surface () of a fan blade () of a centrifugal fan () in an axial direction. Therefore, the axial-direction side end surface () of the fan blade () and the exhaust hole () have a positional relationship so as not to overlap each other in the axial direction. In this manner, cooling air exhausted through the exhaust hole () is unlikely to be forced to return to the exhaust hole (). Therefore, exhaust efficiency is improved to efficiently cool a stator coil () and a stator core ().

Rotary electric machine

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

A vehicular brushless AC generator includes: a bobbin disposed surrounding the axial end face of the thick ring portion of the yoke and the outer circumferential surface of the cylindrical portion so that an exciting coil can be wound thereon; a plate extending radially outwardly from an end of the cylindrical portion, for joining the bobbin to the yoke; and a stator disposed outside the rotor retaining an air gap, in which magnetic flux produced by the exciting coil propagates; wherein the bobbin is provided with a thick portion for extending a creeping distance, formed along the outer circumferential edge of the bobbin joined to the yoke.

Vehicular brushless AC generator and exciting-coil bobbin unit therefor

Provided is a brushless AC generator for a vehicle, with improved cooling performance for an exiting core and an exciting coil. In the brushless AC generator for the vehicle, a rotor includes: magnetic-pole cores fixed to a shaft; a cylindrical exciting core fixed to a rear bracket, the exciting core being inserted into one of the magnetic-pole cores; and an exciting coil formed by winding a conductor around a minor-diameter portion of the exciting core. The rear bracket includes: vent holes for the rotor, through which cooling air generated by rotation of a cooling fin passes, the vent holes for the rotor being formed around a bearing housing portion for housing a rear bearing therein; and a guiding portion including an air duct for guiding the cooling air, which has passed through the vent holes for the rotor, to the exciting core.

Brushless rotary electric machine

To provide a brushless AC generator for a vehicle, which is capable of improving a cooing performance for an excitation coil and increasing an output of electric power generation with a simple structure. An external fanfixed to a shaftoutside the bracketsandand an internal fanfixed to a rotor assembled bodyformed from a first rotor poleand a second rotor poleunited into one body, the internal fanhaving fan bladeprovided in a valley partbetween claw polesof the first rotor pole, are provided. The external fanand the internal fanare used to generate an air flow for cooling a stator core, the rotor assembled body, an excitation coreand an excitation coil

Brushless AC generator for vehicle

An on-vehicle generator mounting device includes: a stay provided with a first insertion hole; a front side mounting leg and a rear side mounting leg of the generator, both being disposed on two ends of the stay; a second insertion hole provided through one of the mounting legs; a cylindrical bush fitted movably into a fitting hole provided through the other of the mounting legs; a clamp nut disposed at the other mounting leg to be adjacent to and coaxially with the bush, so as not to turn within said aperture but with a gap in a radial direction therebetween; and a bolt inserted through the second insertion hole, first insertion hole and bush, the bolt being screw-engaged with the clamp nut. An end of the clamp nut protrudes outward of said aperture beyond an outer surface of the other mounting leg. The clamp nut screw-engaged with the bolt fixing the generator is prevented from corroding due to anti-freezing agent.

On-vehicle generator mounting device

There is provided an interleaving method capable of reducing burst errors. Transmitted data includes a plurality of radio blocks. It is assumed that each radio block includes four burst signals and each burst signal includes data signals of 448 bits, flag signals, and a synchronizing signal. On the basis of the occurrence frequency of burst errors, the communication buffer capacity, the transmission delay time allowed between the transmission and reception, the kind of communication data, and radio wave propagation characteristics, the transmission side selects as the burst length of interleaving, a value from among values 4, 8, 16, 28 and 32 that are multiples of the number 4 of burst signals included in each of the radio blocks and that are divisors of the total number 448 of bits of data signals included in each of radio blocks. The transmission side transmits the selected burst length to the reception side, and conducts interleaving on the basis of the selected burst length. The reception side conducts deinterleaving on the basis of the burst length transmitted from the transmission side.

Interleaving method

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.

Growing community of inventors

Tokyo, Japan

Hideyuki Hayashi