Equivalent circuit modeling of a superconducting synchronous generator with double electromagnetic shields. Part I. Development of theoretical equations

Journal Article · · Electr. Eng. Jpn. (Engl. Transl.); (United States)

DOI:https://doi.org/10.1002/eej.4391000510· OSTI ID:6367073

Muta, I; Magarikaji, N

Superconducting synchronous generators have many favorable features such as high efficiency, small size, large capacity and long critical fault clearing time. Hence, experimental machines with capacity of several tens of MVA are being developed in many countries. In ordinary superconducting synchronous machines, the field winding is placed inside the rotating cryostat and a conducting shielding cylinder (which we call the electromagnetic shield) is fixed to the rotor partly for thermal insulation and partly for shielding the superconducting winding from an asynchronous magnetic field caused by armature reaction. The electromagnetic shield also operates as a damper winding. To let the electromagnetic shield function properly over a wide frequency range, it is desired to use a double-layer type electromagnetic shield or simply double electromagnetic shields. In this paper, we analyze first the two-dimensional electromagnetic field of double shields taking into account the eddy current and the curvatures of the two shields. Next, we derive theoretical expressions for operational impedances of double shields.

• OSTI ID: 6367073
• Journal Information: Electr. Eng. Jpn. (Engl. Transl.); (United States), Journal Name: Electr. Eng. Jpn. (Engl. Transl.); (United States) Vol. 100:5; ISSN EENJA
• Country of Publication: United States
• Language: English

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