Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Osaka University

Toshiba Mitsubishi-Electric Industrial Systems Corporation

Mitsubishi Generator Co., Ltd.

Haruyuki Kometani

Yoshihito Asao

Toshiyuki Yoshizawa

Masahiko Fujita

Ryoji Miyatake

Shinichi Yamaguchi

Takuro Yamada

Kenji Tanaka

Katsumi Adachi

Tomohiro Kikuchi

Masaya Inoue

Takashi Miyazaki

Yuji Takizawa

Hiroyuki Akita

Kenta Kaneko

Takeshi Mori

Atsushi Yamamoto

Shinji Nishimura

Masatsugu Nakano

Moriyuki Hazeyama

Yoshihiro Miyama

Takuya Ito

Yoshinori Miyamoto

Kanji Shinkawa

Katsuhiro Hirata

Noboru Niguchi

Susumu Maeda

Kazuaki Takahara

Hironori Suzuki

Kazuaki Otsu

Kazumasa Ito

Yuta Saito

Takashi Tamura

Kyoko Higashino

Toshiaki Kashihara

Hisanori Yamasaki

Hideaki Arita

Sho Kato

Masao Morita

Yuji Ikeda

Mitsuhiro Kawamura

Keiichi Ito

Ryo Yokozutsumi

Yosuke Uchida

Masaya Harakawa

Kenta Motoyoshi

Takuma Sasai

Kouki Naka

Yuichi Tsuboi

Tsunenobu Yamamoto

Yoshiki Maeda

Ayumu Yamada

Nobuyuki Sora

Nobuaki Muroki

Satoshi Kurita

Takahiro Joyo

Chiyo Fujino

Kosuke Sekiya

Yoshito Asao

Kohei Majima

Ryosuke Kawashima

Naoyoshi Mori

Norihiro Achiwa

Increase in weight of a rotary electric machine including a low-speed rotor in which a spacer made of metal is provided between a plurality of magnetic pole pieces, can be suppressed. The rotary electric machine includes a stator, a first rotor provided so as to be rotatable with respect to the stator, and a second rotor provided coaxially with the first rotor. The first rotor includes a plurality of magnetic pole pieces disposed so as to be arranged in the circumferential direction, a plurality of spacers respectively disposed between the plurality of magnetic pole pieces, two dampers respectively disposed at both end portions in the axial direction, and a fastening tool for fastening each spacer to a corresponding clamper. The spacer has a cavity portion. The spacer and the fastening tool are electrically insulated from each other.

Rotary electric machine

Provided is a magnetic strain wave gear device that makes it possible to achieve both improvement of the efficiency of assembly work and suppression of decrease in energy conversion efficiency. A magnetic strain wave gear device includes: a stator having a stator core, a stator winding, and a stator magnet; a first rotor; and a second rotor. The second rotor includes a second rotor core provided with a plurality of rotor magnet insertion holes and a plurality of rotor magnets inserted into the plurality of respective rotor magnet insertion holes. The first rotor includes a cylindrical first rotor core and a first rotor end plate. The first rotor end plate has a rotor magnet passage hole through which the rotor magnets can be inserted into the rotor insertion holes from outside in a direction of a rotation shaft.

Magnetic strain wave gear device

A permanent magnet-type rotary electric machine includes a stator, a first rotor, and a second rotor. The stator includes a stator core, a plurality of stator teeth, a plurality of stator slots, a plurality of stator magnets, and a stator coil. The first rotor is disposed inside the stator core relative to the plurality of stator magnets. The second rotor is disposed inside the stator core relative to a plurality of first pole pieces. The second rotor includes a plurality of second pole pieces. A proportion of the number of the plurality of stator slots to the number of poles of the plurality of second pole pieces of the second rotor is greater than 1.25 and less than 1.5, or greater than 1.5 and less than 3.0.

Permanent magnet-type rotary electric machine

Provided is a rotating electric machine in which stator coils can be easily inserted into slots while the effect of improving the output performance by a magnet yoke portion is enhanced. The rotating electric machine includes: a stator including a stator core having a plurality of slots, stator coils, and stator magnet, the stator coil and the stator magnet being inserted in each of the plurality of slots; a first rotor; and a second rotor. The stator core has a magnet yoke portion between the stator coil and the stator magnet, and is composed of a first stator core, and a second stator core having the magnet yoke portion.

Rotating electric machine and stator manufacturing method

Provided is a magnetic-geared motor that can suppress eddy current flowing inside a fastening member and reduce power loss. The magnetic-geared motor includes: a stator; a first rotor provided rotatably relative to the stator and including a plurality of magnetic pole pieces and a plurality of spacers disposed so as to be arranged in a circumferential direction; and a second rotor provided coaxially with the first rotor. Each spacer is composed of a plurality of divisional spacers disposed apart from each other in an axial direction, and a plurality of fastening tools for fastening the plurality of divisional spacers in the axial direction, and the divisional spacers and the fastening tools are electrically insulated from each other.

Magnetic-geared motor with divisional spacers

A stator includes: a stator core including a plurality of stator teeth in a circumferential direction with respect to a center of rotation of a rotary electric machine; a stator coil disposed on a bottom portion side of each of a plurality of stator slots formed between the stator teeth; and a stator magnet disposed on an opening side of each of the plurality of stator slots and having the same polarity in a radial direction. In each of the stator slots, a plate-shaped fixing member is provided between the stator coil and the stator magnet so as to be fitted to opposed two wall surfaces of the stator slot, and a magnetic body is provided between the stator coil and the stator magnet.

Stator with stator magnet, magnetic body, fixing member, and coil disposed in slots and rotary electric machine using same

A stator includes: a stator core including a plurality of stator teeth in a circumferential direction with respect to a center of rotation of a rotary electric machine; a stator coil disposed on a bottom portion side of each of a plurality of stator slots formed between the stator teeth; and a stator magnet disposed on an opening side of each of the plurality of stator slots and having the same polarity in a radial direction. In each of the stator slots, a cooling portion is provided between the stator coil and the stator magnet.

Stator with slots having cooling portions between coils and magnets installed therein and corresponding rotary electric machine

Provided is a short-circuit detection device including: a signal acquisition unit configured to acquire, from a magnetic flux detector configured to detect a magnetic flux generated in an air gap between a rotor and a stator of a rotating electric machine, a detection signal corresponding to the magnetic flux; a signal processing unit configured to subject the detection signal acquired by the signal acquisition unit to filtering of removing at least one component of odd-order components included in the detection signal, to thereby generate a filtered signal being the detection signal subjected to the filtering; and a short-circuit detection unit configured to detect a short circuit of a field winding through use of the filtered signal generated by the signal processing unit.

Short circuit detection device and short circuit detection method

A stator includes: a stator core including a plurality of stator teeth in a circumferential direction with respect to a center of rotation of a rotary electric machine; a stator coil disposed on a bottom portion side of each of a plurality of stator slots formed between the stator teeth; and a stator magnet disposed on an opening side of each of the plurality of stator slots and having the same polarity in a radial direction, and in each of the stator slots, the stator magnet is divided at a center in the circumferential direction of the stator slot.

Stator and rotary electric machine using same

A short-circuit generator is a generator in which stator slots provided with windings of a stator placed therein each have a depth in a radial direction perpendicular to a rotor central axis whose ratio divided by a width of the stator slot in a direction perpendicular both to the radial direction and a direction of the rotor central axis, is less than three. A rotor includes: a field winding placed in each of rotor slots; a metallic damper bar placed in each of the rotor slots on an outer periphery side of the field winding; and a metallic wedge placed in each of the rotor slots on an outer periphery side of the damper bar and connected to the damper bar. A damper-bar height that is a height of the damper bar is less than a wedge height that is a height of the wedge in the radial direction.

Short-circuit generator

Provided are a short circuit state analyzer to compare difference value when the AC excitation current is applied at a first frequency with a threshold value, to estimate a short circuit resistance from the difference value based on data indicating a relationship between the short circuit resistance and the difference value at the first frequency when the difference value is smaller than the threshold value, to cause an excitation power supply to apply the AC excitation current to the field windings at a second frequency lower than the first frequency when the difference value is equal to or greater than the threshold value, and to estimate the short circuit resistance from a difference value obtained by the AC excitation current at the second frequency based on data indicating a relationship between the short circuit resistance and the difference value at the second frequency.

Short circuit detection device, and short circuit detection method for rotating electric machine

A squirrel-cage induction rotating electrical machine comprises: a solid rotor, a stator, and bearings. The solid rotor includes a shaft part, a columnar-shaped rotor core part integrally formed with the shaft part and having rotor slots formed therein, and a plurality of conductor bars passing through the respective rotor slots and coupled together at both axial ends outside the rotor core part. The stator includes a cylindrical stator core provided radially outside the rotor core part, and stator windings passing through a plurality of respective stator slots which are formed in the radially inner surface of the stator core. An outer wall and an inner wall of each rotor slot are tilted at a predetermined angle or more with respect to a plane including a rotation axis of the shaft part.

Squirrel-cage induction rotating electrical machine, solid rotor, and design method for squirrel-cage induction rotating electrical machine

A strand of a unit coil of an armature coil is transposed by transposition angle 540 degrees in a slot and transposed by a first transposition angle at coil end portions. In the slot, the strand has a change portion in which the change rate of transposition of the strand is changed. An axial-direction middle point of the change portion is located between a position at transposition angle 90 degrees and a position obtained by adding the first transposition angle of the strand to transposition angle 90 degrees.

Armature coil and armature

A control method for controlling a three-phase dynamoelectric machine that has phase coils arranged in groups includes setting values of a time phase difference of electric currents to be supplied to the in-phase coils of respective groups and a time phase difference of carrier frequencies with which three-phase inverters are PWM-controlled to satisfy a predetermined relationship among the time phase difference of electric currents, the time phase difference of carrier frequencies, and a space phase difference of in-phase coils of the respective groups. The predetermined relationship is based on a result of a comparison between a current amplitude of a primary component and a current amplitude of a secondary component of a carrier harmonic current.

Dynamoelectric machine control method, dynamoelectric machine control device, and drive system

A stator of a rotating electric machine Includes a stator core that has a plurality of slots and in which electromagnetic steel sheets are stacked in the axial direction, a stator coil inserted into the slots, a finger plate provided on an axially outer end surface of the stator core, and a clamper provided on an axially outer end surface of the finger plate and for clamping the stator core via the finger plate. Furthermore, a rectangular parallelepiped-shaped notch is provided on a part of the finger plate from any position at an anti-stator core side located lateral to an upper stator coil in a circumferential direction to a radially inner end portion.

Rotating electric machine stator

Growing community of inventors

Tokyo, Japan

Haruyuki Kometani