High Efficiency Megawatt Motor Thermal Stator Preliminary Design

Szpak, Gerald; Smith, Andrew D.; Thompson, Jerald; Woodworth, Andrew A.; Jansen, Ralph

doi:10.2514/6.2020-3602

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…HEMM is designed to produce 2 kNm of torque at a speed of 6,800 rpm. HEMM's stator employs a copper armature winding that is oil cooled and operates at an average temperature around 423 K (150 °C) [9]. The superconducting rotor is conductively cooled to cryogenic temperatures using a rotating cryocooler embedded inside the machine's shaft.…”

Section: Overview Of Hemm and Its Superconducting Rotormentioning

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: Overview Of Hemm and Its Superconducting Rotormentioning

confidence: 99%