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|Title:||Pulsed Field Magnetization Strategies and the Field Poles Composition in a Bulk-type Superconducting Motor|
Ruiz, Harold S.
Coombs, T. A.
|Citation:||Physica C: Superconductivity and its Applications, 2017 (in press)|
|Abstract:||High temperature superconducting (HTS) bulks offer the potential of trapping and maintaining much higher magnetic loading level compared with the conventional permanent magnets used in rotary machines, although the effective magnetization of multiple HTS bulks with different relative orientations over the surface of cylindrical rotors creates new challenges. In this paper, we present the design and numerical validation of the Pulse Field Magnetization (PFM) strategy considered for the magnetization of the four-pole synchronous fully superconducting motor developed at the University of Cambridge. In a first instance, singular columns of up to five HTS bulks aligned over the height of the rotor were subjected to up to three magnetic pulses of 1.5 T peak, and the experimental results have been simulated by considering the electrical and thermal properties of the system in a 2D approach. The entire active surface of the rotor is covered by HTS bulks of approximately the same dimensions, resulting in an uneven distribution of pole areas with at least one of the poles formed by up to 3 columns of magnetized bulks, with relatively the same peaks of trapped magnetic field. Thus, in order to effectively use the entire area of the superconducting rotor, multiple pulsed fields per column have been applied under the same experimental conditions, what results in about three times larger magnetic pole areas but with an average drop on the peaks of trapped magnetic field of about 50%.|
|Embargo on file until:||1-Jan-10000|
|Rights:||Copyright © the authors, 2017. This article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.|
|Description:||The file associated with this record is embargoed until 12 months after the date of publication. The final published version may be available through the links above.|
|Appears in Collections:||Published Articles, Dept. of Engineering|
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|Accepted_version.pdf||Post-review (final submitted author manuscript)||1.97 MB||Adobe PDF||View/Open|
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