著者

前田 進 山下 拓之 米谷 晴之 下畑 賢司 野村 達衛 泉 昭文

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.123, no.11, pp.1400-1410, 2003-11-01

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Superconducting generators have many advantages such as increasing generation efficiency and improving power system stability etc. In Japan, 70MW class superconducting generators have been developed through the national project"Electric Power Application of Superconducting Technologies (1988-1999)". <BR>In this paper, performance evaluation of the rotor damper structure for the 70MW class model generator is discussed. Double-layered damper structure, which consists of a squirrel-cage warm damper and a single-layered cold damper was set as the target. As the first step, basic electromagnetic and thermal performances were obtained through the experimental model. In the following step, the 70MW model rotor damper structure was designed based on the experimental results and the rotor was manufactured. Evaluation of the damper structure of the 70MW rotor was carried out in the verification test from the technical view point of 'unbalance current capability', 'flux shielding' and 'generator reactance' etc. and satisfactory results were obtained. Consequently, it was proven that the damper structure had the performances to satisfy the requirements of the superconducting generators. Performances obtained from the experimental model, design of the 70MW model rotor and evaluation by the verification tests are described in this paper.

著者

吉桑 義雄 米谷 晴之 宮本 佳典 亀山 正樹 出口 学 水谷 敏彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.861, pp.17-00450-17-00450, 2018 (Released:2018-05-25)

参考文献数

15

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Motors are used in many appliances, and noise reduction is strongly demanded. One of the main causes of noise is electromagnetic excitation force and it is well known that the excitation force is increased by the eccentricity of the rotor to the stator. For this reason, it is very important to decrease the eccentricity, but there are limits because the eccentricity is due to inevitable manufacturing tolerances or assembly errors. So, we propose a method to estimate the eccentricity of the motors in the process of manufacturing by using windings as a sensor. When the rotor and the stator are in an eccentric condition, the impedance of each winding is different. We developed an experimental apparatus that can set the amount of eccentricity and verified that the terminal voltage of each winding changes proportionally to the eccentricity. In order to produce motors with eccentricity of almost zero, we need to estimate the two-dimensional amount of eccentricity in a very short time. When the number of turns of each winding is different, there is interaction between each winding and so the accuracy of the estimation decreases. To solve these problem, we applied a different frequency of voltage to the winding located on the x axis and the winding located on the y axis, so that we can estimate the amount of eccentricity for the x direction and the y direction with high accuracy at the same time. We also developed a way to produce motors by using this technology. After detecting the terminal voltage of each winding under the tentative assembly situation, we adjust the amount of eccentricity to almost zero and fix the motor by laser welding. As a result, we were able to mass produce motors with eccentricity of under one micrometer and with a very low noise level.