High Efficiency Megawatt Motor Risk Reduction Activities

Jansen, Ralph; Scheidler, Justin J.; Tallerico, Thomas; Kascak, Peter; Woodworth, Andrew A.; Smith, Andrew D.; Dyson, Rodger W.; Sixel, William; Thompson, Jerald; Stalcup, Erik; Jesus-Arce, Yaritza De; Avanesian, David; Duffy, Kirsten P.; Passe, Paul; Szpak, Gerald

doi:10.2514/6.2020-3559

Cited by 15 publications

(2 citation statements)

References 2 publications

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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%

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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“…Because of the magnetically transient conditions mentioned above, the conventional REBCO magnet (i.e., insulated with polyimide film), which is electrically and thermally nonconducted, has suffered from local quenches, further resulting in permanent damage, indicating a decrease in stability. Empirically, a situation where operational failure occurred owing to quench or permanent damage inside the REBCO field winding during the field test of several megawatt (MW)-class HTS generators has recently been reported [7,[25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic characteristic analysis of a REBCO magnet with a current bypass/distribution winding technique under an asynchronous rotating magnetic field

Chae¹,

Kim²,

Quach³

et al. 2022

Supercond. Sci. Technol.

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Generally, high-temperature superconducting rotating machines (HTSRMs) are considered synchronous machines. If the output of the HTSRM fluctuates based on frequent changes in the electrical or mechanical loads, there is the concern that an asynchronous rotating magnetic field (RMF) is applied from the stationary copper armature winding to the high-temperature superconducting (HTS) field winding in the rotary. This may act as a magnetic disturbance to the HTS field magnet, resulting in permanent damage. To enhance the reliability of HTS magnets in wind power and electric propulsion applications, winding methods with current bypass/distribution characteristics, such as no-insulation (NI) and metal-insulation (MI), have attracted scholarly attention because of their high thermal and electrical stabilities, resulting in their self-stabilizing and protective performances. To verify the feasibility of the NI and MI winding techniques for wind power generators, the basic characteristics under a time-varying magnetic field must be studied, contrary to HTS magnet applications under a time-static magnetic field. Therefore, the electromagnetic characteristics of rare-earth barium copper oxide (REBCO) magnets applied with NI and MI winding technologies were compared and analyzed in this study, considering the magnetically transient situations in which an asynchronous RMF is applied to REBCO magnets. In addition, we developed a characteristic evaluation device similar to a synchronous rotating machine to generate the unsynchronized RMF. Moreover, various basic tests were performed to target the small racetrack-type field windings. The critical current, n-value, terminal voltage, and center magnetic field are investigated under various values of the frequency and current amplitude of the three-phase armature winding, and their behaviors are discussed in detail based on the characteristic resistances of the two test magnets.

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Concept Design of a 1.4 MW Drive for Rotor Loss Minimization in a Partially Superconducting Motor

Granger

Tallerico

Anderson

et al. 2022

2022 IEEE Transportation Electrification Conference &Amp; Expo (ITEC)

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High Efficiency Megawatt Motor Risk Reduction Activities

Cited by 15 publications

References 2 publications

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

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

Electromagnetic characteristic analysis of a REBCO magnet with a current bypass/distribution winding technique under an asynchronous rotating magnetic field

Concept Design of a 1.4 MW Drive for Rotor Loss Minimization in a Partially Superconducting Motor

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