Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Denki K.k.

Fumito Uemura

Nobuhiro Kihara

Shinji Baba

Tomokazu Umezaki

Naoki Itoi

Hiroshi Okuda

Satoshi Komurasaki

Masayoshi Maeda

Mitsuo Sone

Yoshihide Masumoto

Kenji Ishi

Masaya Inoue

Wataru Fukui

Hiroshi Nakamura

Masahiro Yokotani

Takahiro Urakabe

Mitsuharu Hashiba

Seiki Kodama

Hirohisa Yokota

Shinji Kawaguchi

Masanori Yamano

Sato Komurasaki

The invention has an object of providing a power supply device for vehicle of high efficiency while keeping longer service life of a capacitor. By supplying an electric power of a capacitor to various electronic devices for a first predetermined time period after a vehicle engine has been stopped and discharging an electric power of the capacitor to a battery for a second predetermined time period after the first predetermined time period has ended, the voltage of the capacitor is reduced. By forcing the electric power of the capacitor to discharge at a forced discharge circuit until the voltage of the capacitor is substantially equal to a predetermined voltage after the second predetermined time period has ended, the time period during which the capacitor is held at a high voltage is made shorter. Longer service life of the capacitor and higher efficiency of the power supply device can be achieved.

Power supply device for vehicle

In the case where the rotation speeds of respective magneto alternating current (AC) generators of a plurality of power source apparatuses (, and) are approximately the same rotation speed and the total electric power generation demand is the same as or smaller than the maximum total generated electric power of the plurality of power source apparatuses (, and), the integrated control unit () for integrally controlling the plurality of power source apparatuses (, and) selects at least one of the plurality of the power source apparatuses (, and) and controls a voltage control unit () of the selected power source apparatus in such a way that the selected power source apparatus generates maximum generated electric power thereof, at the rotation speed, that is the same as or smaller than the total electric power generation demand.

Power source system controlling a plurality of generators

An electrical equipment casing includes a circuit board on which many electrical parts are mounted and a heat sink to which the circuit board is fixed. The heat sink is provided with a reactor housing dent that opens in a surface on which the circuit board is placed and radiator fins that reach a bottom portion of the reactor housing dent on a surface opposite to the surface on which the circuit board is placed at a position surrounding an outer circumference of the reactor housing dent. The reactor is housed in the reactor housing dent and a terminal thereof is electrically connected to the circuit board. This structure of the electrical equipment casing can contribute to an achievement of both of a size reduction of the overall casing and enhanced heat dissipation of the reactor.

Electrical equipment casing

A power supply device includes: a magneto generator with a rotor having a magnet; a torque supplying device supplying torque to the rotor; a rectifier circuit supplying electric power to a electrical load device by rectifying an output of the magneto generator; a short circuit electrically shorting an output end of the magneto generator; a voltage detection circuit detecting a terminal voltage of the electrical load device; and a control circuit controlling a voltage of the electrical load device to be a first set value by controlling the short circuit to switch ON (short operating mode) and OFF (rectification operating mode) according to the voltage detected by the voltage detection circuit and allowing the short circuit to operate while making a switching between the two operating modes according to a operating state relating to a rotation of the rotor of the magneto generator.

Power supply device

A power supply device comprising: a magneto generator including a rotor including a magnet forming a magnetic field; a rectifying unit rectifying an alternating current of the generator to a direct current and supplying to an electrical load; a voltage detection unit detecting a voltage of the electrical load; an opening unit interrupting electrical conduction of an output of the generator; short-circuiting units electrically short-circuiting the output; a torque supplying device supplying torque to the rotor; a voltage control unit selectively performing one of opening-control of controlling on/off switching of the opening unit and short-circuit-control of controlling on/off switching of the short-circuiting units to control the voltage of the electrical load to a predetermined value in accordance with the voltage detected by the voltage detection unit; a switching control unit switching and controlling between the above two controls in accordance with an operating state regarding rotation of the rotor.

Provided is a power supply device including: a magneto generator (), which includes: a rotor including a magnet forming a magnetic field; and a stator which generates an alternating current in stator windings by rotation of the rotor; a rectifying unit () which rectifies the alternating current generated by the magneto generator to a direct current; a variable transformation-ratio direct current voltage transformer () which transforms an output voltage of the direct current of the rectifying unit to a voltage between input terminals of an electrical load () to which electric power is supplied; and a voltage control unit () which controls a transformation ratio of the variable transformation-ratio direct current voltage transformer in accordance with at least one of an operating state signal regarding the rotation of the rotor of the magneto generator and an electrical load state signal of the electrical load.

A three-phase alternating current generator includes a bowl-shaped flywheel, sixteen permanent magnets provided on an inner circumferential surface of the flywheel, and a stator located in the flywheel. Further, The stator is composed of twelve teeth provided opposite to the permanent magnets and of coils each being continuously wound around every three teeth among the teeth for generating electric power by an electromagnetic induction effect with the magnets.

Three-phase alternating current generator

A magneto-generator, a method of manufacturing the same and a resin molding die for manufacturing the same. In the magneto-generator, a guard ring is omitted with the performance of the magneto-generator being enhanced. The magneto-generator is manufactured by making use of a resin molding die () having an outer peripheral surface () to be positioned in opposition to an inner peripheral surface of a flywheel () and projections () provided in the outer peripheral surface () for holding a plurality of magnets () at predetermined positions, respectively. The magnets () are positioned and held stationarily at predetermined positions by the aforementioned projections, respectively, and spaces defined between the resin molding die () and the inner peripheral surface of the flywheel () are filled with a resin. After hardening of the resin, the resin molding die () is detached from the flywheel ().

Method of manufacturing a magneto-generator

A magnetoelectric generator includes a bowl-like flywheel () having a bottom portion () formed with ventilation holes (), a plurality of permanent magnets () secured to an inner circumferential surface of the flywheel (), a stator core () disposed within the flywheel () and having peripheral side surfaces facing the permanent magnets (), and a coil assembly () implemented by winding an electric conductor on the core (). Electricity is induced in the coil assembly () by AC magnetic field produced by rotating the flywheel (). A peripheral edge portion of each ventilation hole () is formed with a projecting portion () by plastic deformation, which protrudes toward the coil assembly () for producing turbulent air flows internally of the flywheel () upon rotation of the flywheel ().

Magnetoelectric generator

Magneto-generator, method of manufacturing the same and resin molding die assembly for manufacturing the same

A magneto-generator exhibiting high electricity generation efficiency under the forced cooling effect includes a flywheel implemented substantially in a bowl-like shape, a plurality of magnets disposed on and along an inner peripheral surface of the flywheel, a generator coil disposed internally of the flywheel in opposition to the magnets ( ) for generating electricity under the action of electromagnetic induction between the magnets and the generator coil, and a plurality of resin fins provided along a peripheral edge of the flywheel at an open end thereof for generating forced gas flows in a peripheral region of the flywheel upon rotation of the flywheel for cooling the generator coil.

Magneto-generator

Power generation efficiency of a magneto generator is improved. A guard ring made of a material of high magnetic permeability such as carbon steel plate is arranged inside a flywheel for the purpose of holding and guarding magnets . the guard ring is provided with opening portions at positions where the guard ring coincides with adjacent two end portions of the neighboring magnets . Magnetic flux is prevented from flowing into the neighboring magnets 12 through the guard ring at the time of power generation. The magnetic flux flows into an iron core of a magneto coil , and generation efficiency is effectively improved.

Magneto generator

Ventilation efficiency inside a flywheel is improved. Plural vent holes are formed on a side wall portion of a flywheel formed by a circumferential wall portion and the side wall portion on one end side of the circumferential wall portion, and fins protruding toward inside of the flywheel are formed between the neighboring vent holes The fins are formed integrally at the time of filling with a resin with which a space between a guard ring for guarding plural magnets arranged inside the circumferential wall portion of the flywheel and the flywheel is filled, and the magnets are embedded in the resin In generating electric power, the fins rotate synchronously with the flywheel a negative pressure is generated at the vent hole portions, and outside air is introduced into the flywheel and ventilation is performed.

A pressure sensor comprising a hollow main body (1) defining a bore (3) extending therethrough. A pressure sensing assembly (12) is disposed within the bore (3) to divide it into a detection cavity (3a) for transmitting therethrough the pressure to be detected at a pressure receiving end (3c) thereof and an output cavity (3b) through which an output signal from the pressure sensing assembly (12) is to be supplied. A flexible metal diaphragm (40) is attached to the main body (1) at the pressure receiving end (3c) to seal the detection cavity (3a) in which a pressure transmitting medium (11) is filled. The flexible metal diaphragm ( 40) has a resonance frequency above an oscillation frequency range of the pressure to be detected. Preferably, the effective diameter of the diaphragm (40) may be from 7.5 mm to 8.5 mm and the thickness dimension thereof may be from 35 .mu.m to 45 .mu.m.

Growing community of inventors

Chiyoda-ku, Japan

Fumito Uemura