Risk Reduction Testing of Superconducting Coils for the High Efficiency Megawatt Motor

Scheidler, Justin J.; Tallerico, Thomas; Torres, William; Miller, William V.

doi:10.2514/6.2022-0445

Cited by 4 publications

(1 citation statement)

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“…It has performance targets of greater than 98% efficiency and 16 kW/kg electromagnetic specific power 1 . HEMM's high performance is achieved through the use of a superconducting rotor composed of twelve 2nd generation high temperature superconducting (HTS) coils that are designed to operate at temperatures below 62 K. The development of HEMM's electromagnetic design was supported by testing sub-scale and full-scale superconducting coils in liquid nitrogen (LN2), and the authors have previously published this experimental work [5], [6], [7]. Although these LN2 tests have reduced multiple risks in HEMM's rotor design, they did not test the HTS coils at their designed thermo-electro-magnetic operating condition.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic vacuum chamber testing of a conductively-cooled, high temperature superconducting rotor for a 1.4 MW electric machine for aeronautics applications

Scheidler,

Stalcup,

Tallerico

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper presents the second ever demonstration of a superconducting rotor cooled only via conductive connection to a cryocooler, i.e., without pumped or solid cryogens. The full-scale rotor was operated statically in its intended environment – about 1e-3 torr vacuum with only conductive cooling through mechanical connections to a cryocooler contained on the rotor. Stable operation of the rotor in a representative magnetic environment was demonstrated up to its rated direct current (57.2 A) and the designed temperature limit for the superconductor (62 K). Additional electrical measurements increased confidence that the superconducting coils functioned as intended. A collection of steady state temperature distributions was measured at operating and non-operating conditions. In all but one case, the observed temperature gradient between the cold tip and superconducting coils satisfies the design but with little margin. Opportunities to reduce the gradient are identified.

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Section: Introductionmentioning

confidence: 99%