High Efficiency Megawatt Motor Preliminary Design

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

doi:10.2514/6.2019-4513

Cited by 35 publications

(4 citation statements)

References 5 publications

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“…This section presents the progress made in reducing the risks that the full-scale HEMM prototype will fail or be limited in performance by a problem with the superconducting rotor. These risks are described in [11].…”

Section: Risk Reduction Testingmentioning

confidence: 99%

“…¶ NASA Glenn Research Center is developing a 1.4 MW wound-field synchronous machine. The machine is referred to as the high-efficiency megawatt motor (HEMM) [11]. To illustrate the effect of this machine on a transport aircraft with EAP, system-level studies were performed for one concept aircraft, the NASA single-aisle turboelectric aircraft with aft boundary layer propulsor (STARC-ABL).…”

Section: Introductionmentioning

confidence: 99%

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Progress Toward the Critical Design of the Superconducting Rotor for NASA's 1.4~MW High-Efficiency Electric Machine

Scheidler

Tallerico

Miller

et al. 2019

AIAA Propulsion and Energy 2019 Forum

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NASA Glenn Research Center is developing a 1.4 MW high-efficiency electric machine for future electrified aircraft. This wound-field, synchronous machine employs a self-cooled, superconducting rotor to achieve excellent specific power and efficiency. This paper presents the progress made over the past year toward a critical design of the superconducting rotor, including refined analysis and risk reduction testing on prototype superconducting coils. A 3D finite element model of the rotor is developed to simulate the combined loading imposed by the initial cool down of the rotor from room temperature to cryogenic temperature and the subsequent rotation of the rotor up to the design speed. The model is evaluated to better predict the stress state in the critical components and the reduction in physical gap between the stator and rotor due to the resulting radial deflections. This model includes an enhanced model of the superconducting coil that considers the coil as an assembly of four individual coil layers. An improved coil fabrication process is described in detail. Two sub-scale test coils are fabricated and then tested under repeated thermal cycling between room temperature and liquid nitrogen temperature (77 K). It is demonstrated that the proposed coil fabrication procedure can produce no-insulation, high temperature superconducting coils that can survive several thermal cycles without apparent degradation.

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Section: Risk Reduction Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progress Toward the Critical Design of the Superconducting Rotor for NASA's 1.4~MW High-Efficiency Electric Machine

Scheidler

Tallerico

Miller

et al. 2019

AIAA Propulsion and Energy 2019 Forum

Self Cite

View full text Add to dashboard Cite

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“…To enable electric aircraft, motors with high specific power density and high efficiency are necessary. Figure 1 listed the specific power density of motors for electric aircraft in literature [4][5][6][7][8][9][10][11][12][13]. Some of the motors in figure 1 are only conceptual designs or demonstrators, especially for superconducting motors.…”

Section: Introductionmentioning

confidence: 99%

“…They are generally located in the rotor as the magnetic poles. Up to now, the most widely used superconducting magnets in motors are wound coils [5,15]. The technology to manufacture the wound superconducting coils is quite advanced.…”

Section: Introductionmentioning

confidence: 99%

Preliminary design optimization of a fully superconducting motor based on disk-up-down-assembly magnets

Wang

Liu

Cao

et al. 2023

Supercond. Sci. Technol.

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The transition to electric propulsion for aircraft provides an effective way to reduce fuel consumption and achieves low-carbon aviation. Due to the advantages of high magnetic field and ultra-compactness of superconducting disk-up-down-assembly (‘DUDA’) magnets, they have a promising use in superconducting motors. Therefore, this paper presents a design of a fully superconducting motor using superconducting DUDA magnets with Halbach arrays. In order to study the feasibility of the superconducting DUDA magnets in electric motors, preliminary studies of two sets of 4-layer superconducting DUDA magnets were carried out. The manufacturing method with lap joints of the DUDA magnets was proposed and then the manufactured magnets were tested in liquid nitrogen. The contact resistance and critical current at each lap joint have been calculated and the magnetic field distribution of the magnets has been measured. The magnetic fields of the magnets were also verified by simulation and then the magnets were scaled up in size to meet the magnetic field magnitude for the motor. It has been proved that the DUDA magnets can generate a constant magnetic field above 1.11 T along the x-axis without iron materials, which meets the requirements of motors.Based on the analysis of electromagnetic performance, the structural parameters of the superconducting DUDA magnets were optimized with different pole-slot number combination in order to obtain higher efficiency and specific power density. To calculate the efficiency, finite element models in Comsol evaluated the AC losses of the superconducting DUDA magnets. By changing the slot type and winding configuration, the optimized motor is able to achieve a specific power density of 11.55 kW/kg with an efficiency of 98% at 30 K.

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Technology selection for holistic analysis of hybrid-electric commuter aircraft

et al. 2022

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Electric powertrains have different characteristics than conventional powertrains with combustion engines and require unconventional aircraft designs to evolve their full potential. Therefore, this paper describes a method to identify potential aircraft designs with electrified powertrains. Promising technology options in the fields of powertrain architecture, aerodynamic interactions, onboard systems and operating strategies were collected by the project partners of the LuFo project GNOSIS. The effect of the technology options on a commuter aircraft was evaluated in terms of global emissions ($$\hbox {CO}_{2}$$ CO 2 ), local emissions ($$\text {NO}_{\text {X}}$$ NO X and noise) and operating costs. The evaluation considers an entry into service in 2025 and 2050 and is based on the reference aircraft Beechcraft 1900D. Literature review and simplified calculations enabled the evaluation of the aerodynamic interactions, systems and operating strategies. A preliminary aircraft design tool assessed the different powertrain architectures by introducing the two parameters ’power hybridization’ and ’power split’. Afterwards, compatible technology options were compiled into technology baskets and ranked using the shortest euclidean distance to the ideal solution and the farthest euclidean distance to the worst solution (Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method). An analysis of the CS 23 regulations leads to a high-wing design and excluded the partial turbo-electric powertrain architecture with the gas turbine in the aircraft tail. For 2025, a partial turbo-electric powertrain with two additional electric driven wingtip propellers was selected. A serial hybrid powertrain, which uses a gas turbine or fuel cell in combination with a battery, powers distributed electric propulsors at the wing leading edge in 2050. In both scenarios, the aircraft design includes an electric environmental control system, an electric driven landing gear and electro-hydraulic actuators for the primary flight control and landing gear.

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High Efficiency Megawatt Motor Preliminary Design

Cited by 35 publications

References 5 publications

Progress Toward the Critical Design of the Superconducting Rotor for NASA's 1.4~MW High-Efficiency Electric Machine

Progress Toward the Critical Design of the Superconducting Rotor for NASA's 1.4~MW High-Efficiency Electric Machine

Preliminary design optimization of a fully superconducting motor based on disk-up-down-assembly magnets

Technology selection for holistic analysis of hybrid-electric commuter aircraft

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