AC loss calculation of monofilamentary MgB2 wire in harmonic condition for superconducting rotating machine applications

Yazdani Asrami, M. (Speaker), Zhang, M. (Contributor), Yuan, W. (Contributor), Serdar Atamert (Contributor)

Activity: Talk or presentation typesOral presentation

Description

Superconducting rotating machines provides high power density compared with conventional ones due to very high current density and significant magnetic flux density offered by superconducting materials, which leads to much lighter and compact machines. One of the most promising materials for fabricating full superconducting electrical rotating machines is Magnesium Diboride (MgB2), because it has relatively lower price and fairly easier production process compared with other superconducting materials.
Fully superconducting rotating machines are absolutely essential for modern all electric transportation systems such as ship, aircraft, and train applications. In rotating machines, because of coil/winding distribution and also, construction and assembly process, the magnetic field contains harmonics and is not purely sinusoidal. In addition, the control and drive system cause some current harmonics due to presence of DC/AC and AC/DC converters. Therefore, it is necessary to have a precise estimation of nonsinusoidal AC loss of superconducting machine in design stage. This not only help for better sizing of machine but also, gives a more accurate heat load information for designing the cryocooler.
The references reported in literature were focused on purely sinusoidal current and uniform non-distorted magnetic field, so far. Thus, in this paper AC loss of MgB2 monofilamentary wire carrying nonsinusoidal current and exposed to harmonic magnetic field was calculated using H-formulation in COMSOL Multiphysics. The effect of harmonic orders, fundamental magnetic field level, as well as harmonic content of each harmonic order were considered on AC loss results.

Keywords: AC loss, All superconducting machine, Finite element analysis, harmonic field, MgB2, monofilamentary, nonsinusoidal current, total harmonic distortion.

This project is funded by Innovate UK Aerospace Research and Technology Programme
Period3 Nov 2020
Event titleApplied Superconductivity Conference 2020 (ASC 2020)
Event typeConference
LocationTampa, United States
Degree of RecognitionInternational