Hitachi, Ltd.

Hitachi Engineering Co., Ltd.

Masami Sukeda

Kenichi Hattori

Mitsuru Saeki

Atsushi Ishihara

Masahiro Koike

Ryoichi Shiobara

Yoshinori Musha

Akihito Nakahara

Yasuaki Kageyama

Takahiko Sano

Shingo Inamura

Norihiro Watanabe

Shinya Odajima

Hideo Tanahashi

Kazutoshi Ikeda

A rotary electric machine according to present invention comprises a rotor and a stator disposed around the rotor in which the stator includes a stator core having, along its inner periphery region, a plurality of axially extending stator slots and an armature winding wound through the stator slots. In this rotary electric machine, each stator slot contains four radially layered armature bars; each armature winding is formed by electrically connecting at least one of the armature bars in a first slot and at least one of the armature bars in a second slot to each other; and the armature bars of a pair specified in accordance with a required output voltage of the rotary electric machine are connected to each other with a connecting piece.

Rotary electric machine

In a rotating machinery having armature windings constituted by a lot of strands, when the armature winding is constituted by four layers, a step number of the strands becomes half with respect to two layers of armature windings so as to facilitate manufacturing an armature winding of 540 degree transposition in which a transposition pitch is elongated and a circulating current loss is reduced, but since an output voltage becomes twice, for securing a voltage limit value caused by an isolation resisting force, one layer of armature windings are constituted by sub windings separated into at least two layers in a vertical direction, a transposition is independently applied to each of the sub windings, the sub windings are connected to the armature windings of the other slot while keeping an isolation of the sub winding at an armature winding end region by at least two connecting methods, and the sub winding constructs a parallel circuit by the armature windings of a plurality of slots.

Rotating machinery

There is provided a detector for detecting a layer short of a field winding in operation by measuring, with a field detector, a magnetic field generated from a field winding of an electric rotating machine. In the present invention, a field detector is installed outside an electric rotating machine to measure a leakage flux at the installation point to detect layer short by detecting the increase in a leakage flux or asymmetry of waveform of the leakage flux at an occurrence of a layer short of a field winding thereof, simplifying installation and enabling installation without halting operations of an electric rotating machine.

Method and apparatus for layer short detection of electric rotating machine

An electric rotating machine comprising a stator core having a plurality of slots that are equally spaced on the inner surface of the stator core in the peripheral direction, a rotor that rotates inside the stator core, and an armature winding that is applied to each of the slots, wherein the armature winding is made up with a plurality of serially-connected single-turn coils that are respectively applied to the slots and the serially-connected coils of respective phases are connected in parallel.

Electric rotating machine

A method of connecting hollow conductors with a brazing alloy employs a measuring mechanismfor measuring a connecting state of a connecting portion after brazing hollow conductors. The measuring mechanism comprises a scannerand a holder, which are separated in advance, so that the mechanism can be installed in a narrow space. A display mechanismdisplays measuring results as tow-dimensional patterns, and the evaluation mechanismevaluate the connecting portions by an area of the defects and an integral length of sound portions. A judgment mechanismevaluates relative relation of the measuring results with causes-and-defects, which are previously stored, and shows the cause of the defect.

Method of evaluating connected portions, method of connecting electrical winding conductors and apparatus therefor

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Takahagi, Japan

Masami Sukeda