Hitachi, Ltd.

Hitachi Building Systems Engineering and Service Co., Ltd.

Seikichi Masuda

Daisuke Kori

Mamoru Kimura

Hiroyuki Mikami

Masayasu Fujieda

Hideaki Takahashi

Yoshitaka Iwaji

Yoshio Sakai

Hiromi Inaba

Kiyoshi Nakamura

Masahiro Hori

Akiyoshi Komura

Shinji Sugimoto

Sadao Hokari

Toshiaki Kurosawa

Takayuki Koizumi

Kento Mochizuki

Daigo Kaneko

Takeshi Shinomiya

Shunsuke Otake

Masahiro Konya

Akihiro Nokita

Takei Ando

Masatoshi Koike

Nobuhiko Obata

The permanent magnet type electrical rotating machine has an overhung rotor support structure in which a shaft of a rotor is supported at only one end side thereof by a bearing provided on one side of a casing of the electrical rotating machine. Another end side of the rotor shaft to be a bearing support-free side is capable of being joined to an end of a shaft of a prime mover via a flange formed at an end of the shaft. The rotor shaft is configured such that, upon a state of not being coupled to the prime mover shaft, the flange on the bearing support-free side is joined to an end face of the casing through a retaining member to be prevented from moving in any of an axial, radial and circumferential directions of the rotor shaft.

Permanent magnet type electrical rotating machine and permanent magnet type electrical rotating machine system for vehicle

To prevent demagnetization of a permanent magnet synchronous rotating machine, a rotating machine control device according to the present invention is a rotating machine control device comprising: a power converter having a switch part on each of a positive side and a negative side for each phase; and short circuit detection unit for detecting a short circuit of the switch part, wherein a command to turn on positive-side switches and negative-side switches of a plurality of phases of the switch part is issued in the case where the short circuit detection unit detects the short circuit.

Rotator control device, rotator system, vehicle, electric car and electric generation system

A permanent magnet type rotary electric machine has a rotor having a rotor core and permanent magnets buried into the rotor core by being incorporated into respective permanent magnet slots. The permanent magnet slot per one pole is divided at least into four slots along an outer circumferential direction in the rotor core, and in respective rest core-portions between adjacent divided permanent magnet slots in the rotor core, a width of a first rest core-portion at the middle of each pole and a width of a second rest core-portion between adjacent poles of different polarities are formed larger than that of the others.

Permanent magnet type rotary electric machine

Movement of magnets due to centrifugal force is restricted. In a permanent magnet rotating electrical machinehaving a statorand a rotor coreprovided with a plurality of permanent magnetsinserted in an outer circumferential portion of the rotor, each permanent magnethas inclined surfaces on the outer circumferential side of the rotorand the thinnest portions of the inclined surfaces are adjacent to permanent magnets of the opposite polarity. Further, each magnethas a convex-shaped cross section and is divided into two magnet segments. A magnetic pole bridgeis formed at the boundary of the permanent magnet segments. Thus, movement of the permanent magnet segmentsdue to centrifugal force is firmly restricted, and the peeling off of the rotor coreand the permanent magnet segmentsfrom each other is prevented.

Permanent magnet rotating electrical machine and permanent magnet rotating electrical machine system

A rotor is deployed such that the rotor becomes coaxially rotatable with a stator. A shaft is fixed onto the axis of a rotor iron-core. 1-pole constituting magnet slots are deployed into V-character pattern along an outer circumference portion of the rotor iron-core. Permanent magnets are embedded into the magnet slots. For the 1 pole, the 2 pieces of same-polarity permanent magnets are embedded into the V-character pattern. The configuration of each embedded permanent magnet is designed as follows: From the thickness of the permanent-magnet edge portion on the inner-diameter side of the rotor iron-core, which becomes the center of the V-character pattern, the thickness of the permanent magnet gradually increases toward the outer-diameter side of the rotor iron-core, which become the right and left edge portions of the V-character pattern. Simultaneously, curved lines are provided on both edge portions of the permanent magnet.

Permanent-magnet type electric rotating machine and permanent-magnet type electric rotating machine system for automobile or train

An elevator system which is provided with power converters, electric motors supplied with power from the power converters, and a torque distributing section having functions for determining allocation of output power from the power converters on the basis of a required torque, by which an elevator is operated on the basis of functions selected in accordance with the operation mode. The system is able to save power in the elevator operation and also improve control functions and increase system capacity.

Elevator system

Growing community of inventors

Hitachi, Japan

Seikichi Masuda