### Abstract

In transient operations or fault conditions, high temperature
superconducting (HTS) machines suffer AC losses which
have an influence on the thermal stability of superconducting
windings. In this paper, a method to calculate AC losses and their
thermal effect in HTS machines is presented. The method consists
of three sub-models that are coupled only in one direction. The
magnetic field distribution is first solved in a machine model,
assuming a uniform current distribution in HTS windings. The
magnetic fields on the boundaries are then used as inputs for
an AC loss model which has a homogeneous approximation and
solves the H formulation. Afterwards, the computed AC losses
are considered as the heat source in a thermal model to study the
temperature profile in HTS windings. The method proposed is
able to evaluate AC losses and their thermal effect, thus providing
a reference to design an HTS machine and its cooling system.

Original language | English |
---|---|

Title of host publication | Proceedings of 24th International Conference on Magnet Technology. |

Number of pages | 5 |

Publication date | 2015 |

Article number | 1ORCA 07 |

Publication status | Published - 2015 |

Event | International Conference On Magnet Technology 24 - Seoul, Korea, Republic of Duration: 18 Oct 2015 → 26 Oct 2015 |

### Conference

Conference | International Conference On Magnet Technology 24 |
---|---|

Country | Korea, Republic of |

City | Seoul |

Period | 18/10/2015 → 26/10/2015 |

### Keywords

- AC losses
- Finite element methods
- Homogenization
- Superconducting machines
- Thermal stability

## Cite this

Song, X. A., Mijatovic, N., Zou, S., Jensen, B. B., & Holbøll, J. (2015). AC Losses and Their Thermal Effect in High Temperature Superconducting Machines. In

*Proceedings of 24th International Conference on Magnet Technology.*[1ORCA 07]