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115 results on '"Shima, Kazuo"'

1. Steady-state analysis of a dual-winding reluctance generator with a multiple-barrier rotor

Author

Fukami, Tadashi, Momiyama, Masatoshi, Shima, Kazuo, Hanaoka, Ryoichi, and Takata, Shinzo

Subjects
Reluctance motors -- Design and construction, Circuit design -- Evaluation, Saturation (Electronics) -- Evaluation, Rotors -- Design and construction, Rotors -- Mechanical properties, Circuit designer, Integrated circuit design, Business, Electronics, Electronics and electrical industries
Abstract

This paper presents the modeling and steady-state performance of a novel dual-winding reluctance generator (DWRG) that uses a multiple-barrier (MB) rotor. A simple math-ematical model was developed, and the effects of external parameters (speed, field current, and load) on the steady-state performance were analyzed. Experimental results conducted on a prototype machine were also provided to justify the theoretical approach and performance calculations. The developed model takes into account the magnetic saturation and core loss and enables a quantitative prediction of load characteristics from the no-load test data. Index Terms--Core loss, dual winding, equivalent circuit, magnetic saturation, multiple-barrier (MB) rotor, reluctance generator.

Published
2008

2. Fast calculation of field currents and reactances for doubly fed generators with rotor duct pieces

Author

Shima, Kazuo, Ide, Kazumasa, Takahashi, Miyoshi, Okada, Masayuki, and Nagura, Osamu

Subjects
Finite element method -- Usage, Air-turbines -- Design and construction, Skin effect (Electricity) -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Doubly fed generators have been used as adjustable-speed pumped-storage generator motors and wind turbine generators. Accurate determination of field currents and reactances is important for the design of these machines. We propose a calculation method to obtain the field currents and reactances of machines with rotor duct pieces under any steady-state balanced load condition. The method links two-dimensional static finite-element analysis (FEA) with an approximate calculation to consider three-dimensional (3-D) skin effect in the duct pieces. Its advantage is that the computational time is much smaller than 3-D transient FEA when the slip frequency is not zero. The method will contribute to improvement of the design of doubly fed generators with rotor duct pieces. It was applied to a 395 MVA machine, and the calculated field currents agreed well with the measurements. Variation in the reactances due to saturation is also discussed. Index Terms--Adjustable-speed pumped storage system, cross magnetization, finite-element method, inductance, skin effect, slip.

Published
2006

3. Steady-state magnetic circuit analysis of salient-pole synchronous machines considering cross-magnetization

Author

Shima, Kazuo, Ide, Kazumasa, Takahashi, Miyoshi, and Oka, Kiyoshi

Subjects
Magnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A simple magnetic circuit of salient-pole synchronous machines is presented. A method for calculating steady-state electrical performances using the circuit is described. Magnetic saturation including the cross-magnetizing phenomenon is considered in the method. The saturated reactances, field currents, and load angles are calculated easily from the method without much computational effort as compared with the finite element method. Despite the simplicity of the magnetic circuit, the calculated reactances at various load conditions using the method are close to the measured and FEM values. Index Terms--Cross-magnetization, magnetic circuit, magnetic saturation, reactances, synchronous machines.

Published
2003

4. Finite-element calculation of leakage inductances of a saturated salient-pole synchronous machine with damper circuits

Author

Shima, Kazuo, Ide, Kazumasa, and Takahashi, Miyoshi

Subjects
Electric currents, Vagrant, Damping (Mechanics) -- Research, Finite element method -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

It is important to understand the relationship between leakage flux distributions and machine characteristics for better design of synchronous machines. This paper presents a calculation method for leakage inductances of saturated salient-pole machines with damper circuits. All leakage inductances are divided into the self-leakage, gap leakage, and winding-differential leakage inductances. The leakage inductances correspond directly to the leakage flux distributions in the machines. Cross-magnetizing inductances are also calculated. The method is applied to a 300-MVA class generator. The relationship between the winding distributions, flux distributions, saturation, and inductances is discussed. Weak magnetic influence of the damper circuits on the armature in the d-axis is quantitatively illustrated through values of the winding-differential leakage inductances. The cross- magnetizing inductances, except for the d-axis damper circuits, are relatively large. Variations of the armature self-leakage inductances with saturation are small, and variations of the field and damper self-leakage inductances are larger. Index Terms--Cross-magnetizing effect, damper circuits, finite element methods, leakage inductances, magnetic saturation, salient-pole synchronous machines.

Published
2002

5. 電験三種合格支援プロジェクトにおける取組－学習支援Webシステムの構築を軸として－;Support Project to Pass Qualification Test for Third-Class Chief Electricity Engineer’s License by Creating Web-Based Learning Support System

Author

島, 和男, SHIMA, Kazuo, 深田, 晴己, FUKADA, Haruki, 芦野, 慎, ASHINO, Makoto, 大澤, 直樹, OSAWA, Naoki, 池永, 訓昭, IKENAGA, Noriaki, 河野, 昭彦, KONO, Akihiko, 山本, 成人, and YAMAMOTO, Shigeto

Subjects
電気主任技術者 / 課外学習 / 技術者教育 / e ラーニング / 地（知）の拠点整備事業 / Chief electricity engineer / Extracurricular study / Engineering education / E-learning / Center of Community, ComputingMilieux_COMPUTERSANDEDUCATION
Abstract

金沢工業大学では、学生向けに正課外で電験三種対策講座を実施している。電験三種の資格を持つ卒業生を多く輩出すれば、社会に貢献できる。さらに、もし講座に社会人受講生を継続的に受け入れることができれば、これも社会貢献になる。そこで、本講座を活用することによって、学生および社会人の電験三種合格と学力向上を支援するための体制作りに取り組んだ。学習支援 Web システムを構築したことにより、講座の利便性を向上できた。社会人受講生を増やしていくための宣伝体制もいくつか整えた。構築した支援体制を改善しながら、長期的に持続させていきたいと考えている。;Extracurricular courses for the students to pass the third-class chief electricity engineer’s test have been held in Kanazawa Institute of Technology. Using the courses, the authors constructed frameworks to support the students and people in the neighboring community to pass the test and to develop their academic skills. A web-based learning support system to enhance the convenience of the courses is created. Some frameworks to increase the number of course students from the neighboring community are constructed.

Published
2017

42. Localization of gonadotropin binding sites in human ovarian neoplasms

Author

Nakano, Ryosuke, Kitayama, Syunya, Yamoto, Mareo, Shima, Kazuo, and Ooshima, Akira

Subjects
Ovarian tumors, Gonadotropin -- Research, Hormone receptors, Health
Abstract

The cause of cancer of the ovaries is unclear, but receptors for certain hormones on the surfaces of cancer cells have been implicated. The cell receptors are thought to have a particular affinity for follicle stimulating hormone (FSH), luteinizing hormone (LH) or human chorionic gonadotropin (HcG), although involvement of this latter hormone is controversial. Tumor specimens from 29 patients with ovarian cancer were evaluated for hormone binding sites. Sites for FSH were found on five tumor samples. Sites for LH were found on two tumor samples. These binding sites were found in the stromal layer of the ovarian tissue. The way these hormone receptor sites respond to gonadotropin hormones needs to be investigated.

Published
1989

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