Denso Corporation

Nippondenso Co., Ltd.

Toshinori Maruyama

Yoshio Akita

Keiji Takahashi

Fuyuki Maehara

Takatoshi Inokuchi

Koshi Torii

Masaya Nakanishi

Makoto Taniguchi

Wakako Kanazawa

Asaka Kimura

Takanori Teshima

Hirohide Sato

Katsuya Muto

Takeshi Sada

Toshiaki Matsuhashi

Hajime Matsuhashi

Tadashi Uematsu

Kenji Oshima

Nobuhito Okamoto

Tadatoshi Asada

Hidetoshi Kato

Hiroaki Ishikawa

Toshio Tsutsui

Tomoya Okuno

Yasuhiro Takase

Hideto Okahara

Toshikazu Kizawa

Hitoshi Mori

Tadakazu Nagata

A rotating electric machine includes a machine main body, a frame member and a rectifier. The machine main body is configured to generate alternating current. The frame member holds the machine main body. The rectifier is provided axially outside the frame member and has a rectification circuit configured to rectify the alternating current generated in the machine main body into direct current. The rectifier includes first and second heat sinks that are located to axially overlap each other, first rectifying elements mounted to the first heat sink and constituting an upper arm of the rectification circuit, and second rectifying elements mounted to the second heat sink and constituting a lower arm of the rectification circuit. The second heat sink is located closer than the first heat sink to the frame member. The surface area of the second heat sink is greater than the surface area of the first heat sink.

Rectifier of rotating electric machine

A rectifier has a rectification circuit configured to rectify multi-phase alternating current generated by a rotating electric machine into direct current. The rectifier includes upper-arm semiconductor switching elements included in an upper arm of the rectification circuit, upper-arm protection diodes included in the upper arm and each being electrically connected in parallel with one of the upper-arm semiconductor switching elements, lower-arm semiconductor switching elements included in a lower arm of the rectification circuit, and lower-arm protection diodes included in the lower arm and each being electrically connected in parallel with one of the lower-arm semiconductor switching elements. Each of the upper-arm and lower-arm protection diodes is configured to have, when a reverse voltage higher than a breakdown voltage of the protection diode is applied to the protection diode, an operating resistance that is higher than three times an operating resistance of any of the upper-arm and lower-arm semiconductor switching elements.

Rectifier and rotating electric machine including rectifier

In a rotary electric machine, a modulation signal generator generates a modulation signal including information indicative of rotation of a rotor based on change of a voltage at an output end of a stator winding, and outputs the modulation signal. A rectifying unit alternately turns on and off the switch to rectify the voltage at an output end of the stator winding, thus generating a rectified voltage. An excitation current supplying circuit is communicably connected to the modulation signal generator via a communication line, and starts a supply of an excitation current to the excitation winding of the rotor to induce a rotating magnetic field in the stator winding when the modulation signal output from the modulation signal generator is input thereto via the communication line.

Rotary electric machine capable of detecting malfunction in switch

In a power generator, a determiner determines whether a phase voltage output from each of multiphase armature windings has exceeded a threshold voltage. A turn-on unit turns on at least one of the protective switches as a target protective switch to limit the output voltage of the rectifier circuit to be lower than the threshold voltage upon the phase voltage output from at least one of the multiphase armature windings corresponding to the at least one of the protective switches has exceeded the threshold voltage.

Power generator with load-dump protection

An electric rotating machine for a vehicle is equipped with a load dump protector. The load dump protector works to selectively perform a first and a second load dump protection operation to suppress a voltage surge arising from the load dump. When a rate at which an output voltage from the electric rotating machine is determined to be smaller than a given value, the load dump protector waits for stating the first load dump protection operation until the time when a voltage surge arising from changing of switching devices of a rectifier module of the electric rotating machine is expected to be suppressed and then performs the first load dump protection operation. When the rate is greater than the given value, the load dump protector immediately initiates the second load dump protection operation. This ensures the stability in eliminating the risk of a voltage surge arising from the load dump.

Electric rotating machine with load dump protector

An alternator has rectifying module groups. The rectifying module groups form a bridge circuit. The rectifying module groups have a load dump protection judgment section for monitoring an output voltage of rectifying module groups. When the monitored output voltage exceeds a first threshold voltage, the load dump protection judgment section provides to a control section an instruction to turn on MOS transistors in a lower arm of the bridge circuit at a time when a predetermined delay time has elapsed. When a second threshold voltage is lower than the first threshold voltage and the monitored output voltage becomes less than the second threshold voltage after the monitored output voltage exceeds the first threshold voltage, the load dump protection judgment section provides to the control circuit an instruction to turn on the MOS transistors in the lower arm after the MOS transistors are turned off during a predetermined time length.

Electric rotary machine for motor vehicle

The abnormality detection apparatus includes a first function of measuring a first temperature of a first portion of the abnormality detection apparatus, the first temperature having a correlation with a second temperature of a second portion of a vehicle alternator, a second function of integrating a stress depending on a temperature variation of the first portion on the basis of the first temperature measured by the first function, a third function of predicting occurrence of abnormality in the second portion depending on the stress integrated by the second function, and a fourth function of issuing an alarm when the third function predicts occurrence of abnormality.

Abnormality detection apparatus

The present invention provides, as one aspect, an apparatus for detecting an abnormality of a generator for vehicles. The generator includes a multi-phase armature winding that has phase windings and a rectifier that rectifies multi-phase output of the armature winding. The apparatus includes a first period detection unit that detects a first period of an output voltage of the generator, a second period detection unit that detects a second period of an voltage of one of the phase windings, and an abnormality determination unit that determines presence or absence of an abnormality of the generator by comparing the first period with the second period.

Apparatus and method for detecting an abnormality of a generator for vehicles

The vehicle-use power generation control apparatus for controlling an operation of a vehicle generator includes a temperature detecting circuit detecting a temperature of a predetermined place reflecting a temperature of the vehicle generator, and a power control circuit having a function of restricting, when the temperature detected by the temperature detecting circuit exceeds a predetermined reference temperature, a power generation amount of the vehicle generator at a predetermined change rate.

Vehicle-use power generation control apparatus

The power generation control device for a vehicle generator includes an IC circuit including a communication circuit formed therein and having a function of performing a digital communication with an external device through a communication wire, and a resistor mounted to the IC circuit so as to connect the communication circuit to a communication terminal of the power generation control device connected to the communication wire.

Power generation control device for vehicle generator

The vehicle generator includes a rotor around which a field winding is wound, a stator around which an armature winding is wound, a rectifier rectifying an AC voltage induced in the armature winding to generate a DC output current. The rectifier has a plurality of rectifying elements mounted to a current path section thereof, the DC output current flowing through the current path section to reach an output terminal of the vehicle generator. The vehicle generator further includes a first voltage detector circuit detecting a voltage difference between two points of the current path section located along a direction in which the output current flows, and an output current calculating circuit calculating a value of the output current on the basis of the voltage difference detected by the first voltage detector circuit and a resistance value between the two points of the current path section.

Vehicle generator

A voltage regulator for an a.c. generator produces a power generation ratio signal having a duty ratio corresponding to the current supply to the field winding of the a.c. generator. This power generation ratio signal is applied to an external apparatus through a signal wire. The duty ratio of the power generation ratio signal is more than 10% when the a.c. generator is normal. When abnormality is detected, the power generation ratio signal is partly masked by an abnormality detection signal so that the duty ratio of the power generation signal is reduced to be less than 10% and this change may be detected by the external apparatus. Alternatively, the power generation ratio signal may be transmitted only intermittently when the abnormality is detected.

A.C. generator control apparatus and method having abnormality information output function

A voltage control system for a vehicular power generator includes a receiver unit that receives voltage pulse signals indicating characteristics of the voltage control system from an external device with stability. The device periodically reads two cycles of leading edges or trailing edges, or two periods of high level pulses or low level pulses. When a difference between the two cycles or periods is within a predetermined range, the indicated value of the present voltage pulse signal is used to control the power generator. When the difference is out of the predetermined range, the indicated value of the stored previous pulse signal is used instead.

Vehicular generator control system and method responsive to external signals

A voltage regulator of an automotive generator has a MOS transistor, flywheel diode, voltage detection circuit, and booster circuit. When a battery terminal voltage is below a voltage adjustment setting, current is supplied by a current supply circuit separate from a charge pump circuit to raise a gate voltage of the MOS transistor until the source voltage of the MOS transistor becomes greater than the reverse bias voltage of the flywheel diode, and the charge pump circuit output is applied to the MOS transistor after this specified value is reached. The charge pump circuit has an even number of capacitor stages.

Automative generator control apparatus

A voltage regulator of a vehicle AC generator is comprised of a field current switching circuit connected to a field coil, a control circuit for controlling the field current switching circuit according to an output voltage of the armature coil; a power circuit for supplying electric power to the control circuit, a power drive circuit for controlling supply of electric power of the power circuit to the control circuit, and a rotation speed sensor. The power drive circuit supplies electric power from the power circuit to the control circuit if the rotation speed becomes as high as a predetermined speed.

Growing community of inventors

Anjo, Japan

Toshinori Maruyama