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Description
AC loss in high-temperature superconducting (HTS) stator windings is a key constraint in fully HTS rotating electrical machines, as it directly determines the cryogenic cooling load and thermal management requirements. In practical operation, HTS stator windings are exposed simultaneously to rotating magnetic fields and AC transport currents. The resulting AC loss is therefore not simply the sum of magnetization and transport losses, due to their electromagnetic coupling. Under a given machine performance requirement, balancing these two loss components is essential for minimizing the total AC loss and associated cryogenic load. In this work, the AC loss characteristics of HTS stator windings are numerically investigated using a MW-class axial-flux fully HTS wind turbine generator as the reference machine. The effects of generator geometry, stator winding configuration, and HTS conductor type on AC loss are systematically evaluated. Finite-element models based on the T–A formulation are developed, incorporating interpolated Ic(B,θ) characteristics to account for the dependence of critical current on magnetic-field magnitude and orientation. A moving-mesh technique is employed to capture the transient electromagnetic behaviour associated with rotor motion. The results demonstrate that appropriate optimization of the machine geometry and stator winding parameters can effectively reduce the total AC loss. In particular, reducing the perpendicular component of the magnetic field, Bper, is identified as an effective approach for mitigating AC loss and cryogenic cooling requirements. These results highlight the importance of coordinated optimization of electromagnetic and winding parameters for reducing AC loss and enabling efficient cryogenic and system-level design of fully HTS generators.
| Submitters Country | U.K. |
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| Are you a student? | No |
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