AC loss in REBCO stator windingsof superconducting motors for electric and hybrid aircrafts

Source: Airbus group innovations

RPHI REBCO stator coil

(section of J maps below)

Stacks of REBCO tapesor permanent magnets

y

xz

AC loss modeling method Coils in motor

Stand-alone coil

Electric and hybrid airplaneswill reduce emissions

Light powerful superconducting motors

Qualitative sketch

Goals:1 MW20 kW/kg

Three coupling situations

Tapes coupled at endsAssume J uniformin stator coils

Computevector potentialby COMSOL

Remove contribution from all coilsand calculateactual J and AC loss by MEMEP

Models take into accountInteraction between J in each stator coil and:

Models do not take into accoutInteraction between magnetization currents and iron

Valid for sufficient distancebetween coils and iron

All other superconducting coils and their magnetization currents

All iron parts

Rotor

coils with iron (no rotor)

Fully coupled in whole lengthcable made of n parallel tapes

x

zy

I

ReBCO tapemetal

Cable section andconnections

bare coils (no iron or rotor; for model test purposes only)circled sectionin sketch

Isolating tapes reduces AC lossalmost as much as uncoupled case,such as transposed cables

E Pardo1, F Grilli2, T Reis3, S Wolfstädter3

Horizon 2020 project ASuMED partners (http://asumed.oswald.de):

1Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava2Kalrsruhe Institute of Technology3OSWALD Elektromotoren GmbH

x

z

y

Coupled at ends only

I

Uncoupled (ideal situation)I/nI/nI/nI/n

with loadcurrent amplitude = Im,load

no loadcurrent amplitude = 0

full motor with iron and rotor (situation with load; same current as above)

[DOI: 10.1088/0953-2048/28/4/044003]

full motor with iron and rotor (no-load situation: zero current in stator)

Combining numerical methodsenables to model AC loss in stator of full superconducting motor

Funded by the European CommissionGrant No 723119

EUCAS 2017, Geneva

The calculations from IEE were performed in the Computing Centre of the Slovak Academy of Sciences using the supercomputing infrastructure acquired in project ITMS 26230120002 and 26210120002 (Slovak infrastructure for high-performance computing) supported by the Research & Development Operational Programme funded by the ERDF.

http://asumed.oswald.de/https://doi.org/10.1088/0953-2048/28/4/044003

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