A Study of Alternators with Superconducting Field Windings: II - Experiment

Stekly, Z. J. J.; Woodson, H.H.; Hatch, Ainslie; Hoppie, L. O.; Halas, E.

doi:10.1109/tpas.1966.291668

Cited by 20 publications

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“…The development of superconducting machine work began in 1964 in US. In 1965, the US Avco-Everett Research Laboratory successfully developed the first superconducting generators, it is a 8 kW, 4 pole generator [3] , stator winding made from NbZr superconducting lines, as the exciting winding; the rotor using ordinary copper wires, as the armature winding.…”

Section: The State-of-the Art Of Lts Generatorsmentioning

confidence: 99%

State-of-the Art and Perspectives of Superconducting Generator

Zhao

2013

AMM

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Based on low temperature superconducting (LTS) & high temperature superconducting (HTS) material classification, the superconducting generators can be divided into LTS generators and HTS generators. The research status and characteristics of superconducting generators are summarized; and several topological structures of superconducting generators are introduced. Compared and studied traditional rotating machine with superconducting rotating machine, pointing out the present superconducting generators bottleneck problems. Finally, the prospects of the development of superconducting generators are described.

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Section: The State-of-the Art Of Lts Generatorsmentioning

confidence: 99%

State-of-the Art and Perspectives of Superconducting Generator

Zhao

2013

AMM

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“…2 Actually, Franklin uses a K factor as mentioned in the Introduction, where 0.5 < K < 0.9. This produces the approximation ik K(O -ß) ILlIW.…”

Section: Alternator-rectifier Modelmentioning

confidence: 99%

Steady State Analysis of the Rectified Superconducting Alternator

Stuart

Tripp

1977

IEEE Trans. Aerosp. Electron. Syst.

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Equations are derived to predict the electrical behavior of a threephase superconducting alternator connected to a full-wave bridge rectifier. This is accomplished by expanding a previous analysis for conventional rectified alternators and adding computational improvements. The significance of the work is that it provides a means of calculating certain critical variables such as the ac current in the superconducting field winding and the ac voltage harmonics at the rectified output. A numerical example based on a machine designed for airborne applications is included.Recent advancements in superconducting alternators have created a strong interest in using these machines for airborne electric power supplies. The predominant advantage of this power source is its relatively low weight for applications requiring multimegawatt outputs at several kilovolts. This low weight characteristic occurs because of two factors: 1) even with the required cryogenic equipment, the superconducting alternator system weighs much less than a conventional altemator; 2) the higher armature voltages of the superconducting machine may eliminate the need for heavy output inverters and transformers. These low weight, high voltage attributes are discussed in further detail in [1 ] through [12]. A very recent example of such a machine is also described by McCabria et al. in [13]. This particular machine develops 10 MVA at 5 kV and weighs approximately 1000 lbs (alternator weight only). This same reference also includes projected estirnates for a 25 MVA machine weighing between 1882 and 2160 lbs, depending on rated output voltage (again, these figures only include the weight of the alternator).The potential advantages of superconducting alternators have prompted extensive research in this area, most of which has concentrated on ac loads (again see [1 ] through [13]). Applications for these machines also exist in high power dc systems, however, where the alternator is connected to a rectifier bridge followed by a large filter choke. This mode of operation has been studied in detail for conventional alternators (see [14] through [17]), but until now, no such analysis has been presented for the superconducting machine.One of the more rigorous analyses of conventional rectified alternators is that presented by Franklin [16], [17] for salient pole machines. By assuming constant flux linkages for the rotor windings, this study derives a set of nonlinear equations in terms of the electrical variables of interest. Certain approximations then lead to a linearization involving a constant K factor, and an explicit solution is obtained. The advantages of this approach are readily apparent since it provides a closed form expression for each of the variables, once the proper K factor has been found. The determination ofK is somewhat distracting, however, since it is load dependent and requires the use of numerical methods. In the following section it will be shown that this K factor can actually be eliminated from the final solution if a Newton-Raphson alg...

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Innovation of Electrical Machine Topologies

2022

General Airgap Field Modulation Theory for Electrical Machines

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A Study of Alternators with Superconducting Field Windings: II - Experiment

Cited by 20 publications

References 1 publication

State-of-the Art and Perspectives of Superconducting Generator

State-of-the Art and Perspectives of Superconducting Generator

Steady State Analysis of the Rectified Superconducting Alternator

Innovation of Electrical Machine Topologies

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