Mitsubishi Hitachi Power Systems, Ltd.

Hitachi, Ltd.

Hitachi Engineering Co., Ltd.

Mitsubishi Heavy Industries Limited

Mitsubishi Power, Ltd.

Yasuaki Kageyama

Keiji Suzuki

Mitsuru Onoda

Tsutomu Kono

Satoshi Hirano

Nobuaki Nakasu

Kengo Iwashige

Seunghwan Park

Hiroki Nakatsuchi

Kazuo Goto

Juichi Enyama

Harumasa Tsuchiya

Yoshitaka Tsutsui

Ryosuke Umezu

Kazuhiko Takahashi

Takahiro Sato

Kenji Ikeda

Kenichi Hattori

Masahiro Koike

Yukihiro Yamamoto

Hiroaki Kojima

Yoshinori Musha

Hisashi Morooka

Masami Sukeda

Toru Muto

Takayasu Tanaka

Yasunori Satake

Seiichi Sawada

Norihiro Watanabe

Shinya Odajima

Hideo Tanahashi

Kazutoshi Ikeda

A rotor coil for a revolving armature includes a strand coil that includes a part arranged in a core slot of the rotor and is composed of a plurality of element wires; and a solid coil welded to an end of the strand coil wherein the end of the strand coil and an end of the solid coil are welded by friction stir welding. A manufacturing method of a rotor coil includes the step of performing friction stir welding wherein the friction stir welding is performed for the butt joint with the end of the strand coil arranged in an advancing side defined by a rotation direction of a tool and with the solid coil arranged in a retreating side.

Friction stir welding of a solder coated strand coil to a solid coil

Rotor coil for armature of rotating machine and production method thereof

A fixing force measuring apparatus including a section for applying a predetermined controlled hammering force to a wedge surface to generate a hammering sound, a section for controlling the hammering sound generated, a section for obtaining plural kinds of feature quantities such as a feature quantity due to a hammering sound energy, and a feature quantity due to a frequency of the hammering sound from the hammering sound collected by an arithmetic operation, and a section for obtaining a fixing force corresponding to the plural kinds of feature quantities by using a correlative relationship between the wedge fixing force previously obtained, and the plural kinds of feature quantities.

Apparatus and method for measuring fixing force

According to a method by a frequency analysis of tap tones at the time when a tightness of a ripple member fixed by an elastic force has been tapped by a hammer or a method of detecting a response at the time when the ripple member has been vibrated, an enough precision cannot be obtained for a tightness estimation. A tapping force is applied to a plurality of positions on the member surface, thereby allowing a plurality of tap tones to be generated. Feature amounts are obtained from the plurality of tap tones. An average feature amount is obtained by averaging the feature amounts. The tightness of the ripple member is estimated from the average feature amount by using a correlation between the tightness of the ripple member and the average feature amount.

Tightness measuring apparatus and measuring method

In an electrical machinery and apparatus, a storage space is formed along an extension direction of a strand, and a temperature sensor is installed in the storage space of the strand, so that temperature of the strand can be immediately measured, and no pressure is applied to the temperature sensor in the process of forming a ground wall insulation thereby the temperature of the strand can be accurately measured.

Installation structure for temperature sensor in electrical machinery and apparatus

The present invention provides a method for analyzing growth of void of resin in a porous material which comprising the steps of inputting data of the shape of a porous material filled with a resin material, and dividing the shape of the porous material into three-dimensional solid elements; inputting physical properties of the porous material, and boundary conditions including a pressure that is applied to the porous material; obtaining a resin-density distribution in the porous material through fluid analysis using a database obtained by experimentally measuring in advance a temporal change in a volume of gas generated from the resin material and porous material during heating, changes in a compressive force and compressive displacement respectively occurring when the porous material impregnated with the resin is compressed, and a change in a flow resistance of the resin; and comprehensively grasping production, growth, and distribution of voids deriving from gas generation.

Method for analyzing growth of void of resin in a porous material

The present method aims at preventing breakdown by selecting conditions for preventing the occurrence of voids via analysis. According to the present method, a database related to the time variation of amount of generated gas or number of moles when a solid member is heated is experimentally formulated in advance, and the amount of generated gas from the member and the specific heat ratio of gases are entered for analysis in order to predict via analysis the generation of voids within the resin material when the solid member is heated, to thereby select conditions for preventing voids.

Method for predicting volume change of void generated in resin filled in porous body, and method for analyzing flow of resin material in porous body

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

Growing community of inventors

Hitachi, Japan

Yasuaki Kageyama