Characteristics of superconducting synchronous generators with claw-shaped poles for aircraft

Аuthors

Kovalev K. L.^*, Penkin V. T., Modestov K. A., Dubenskii A. A.^**

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: kaf310@mai.ru
**e-mail: daalarz@yandex.ru

Abstract

This paper is devoted to onboard brushless superconducting synchronous generators for full-electric aircraft. The new constructive scheme of superconducting synchronous machine is offered that contains claw-shaped poles and permanent magnets. The advantages of suggested constructive scheme of the machine are specified. It is shown the permanent magnets in a claw-shaped rotor increase main magnetic flux in an active zone of the generator.

The purpose of work is to get characteristics of machine and recommendations for choice of constructive data of machines on the basis of the obtained characteristics for further projecting.

Open-circuit characteristics and on-load characteristics of the offered synchronous machine with claw-shaped poles and permanent magnets obtained settlement and by practical consideration and reflecting advantages of application of permanent magnets in the offered design are provided. The obtained open-circuit characteristics confirm expediency of application of permanent magnets in claw-shaped rotor. On the basis of the obtained family of open-circuit characteristics the recommendations for a choice additional air gap value in a magnetic circuit of the machine at its design are given. In family of open-circuit characteristics there is a point of intersection of all characteristics. If the point corresponding to a nominal operating mode of the machine is below a point of intersection of characteristics, it is necessary to choose the greatest value of an additional air gap as in this case the main part of the main magnetic flux will be created by permanent magnets. If the point of the nominal mode is above a point of intersection of characteristics, it is necessary to choose the minimum value of an additional air gap should be chosen minimum as in this case the main part of the main magnetic flux will be created by excitation winding.

The on-load characteristic of the offered machine has good overloading ability. It is shown that in this design of the generator the superconducting excitation winding has to be used as the regulator of output voltage.

Keywords:

fully electrified aircraft, superconducting synchronous electric machine with claw-shaped poles and permanent magnets

References

1. Hazelton D.W. 2G HTS Properties Beyond Critical Current, CHATS, 2013, http://www.superpower-inc.com/system/files/CHATS+Workshop+2013+Super Power.pdf
2. Levin A.V., Musin S.M., Kharitonov S.A., Kovalev K.L., Gerasin A.A., Khalyutin S.P. Elektricheskii samolet: kontseptsiya i tekhnologii (Electric plane: concepts and technologies, Ufa, UGATU, 2014, 388 p.
3. Luongo C.A., Masson P.J., Nam T., Mavris D., Kim H.D., Brown G.V., Waters M., Hall D. Next Generation More-Electric Aircraft: A Potential Application For HTS Superconductors, IEEE Transactions on Applied Superconductivity, 2009, vol. 19, no. 3, http://ewh.ieee.org/tc/csc/europe/newsforum/pdf/LuongoC_2AP01.pdf
4. Bout D.A. Beskontaktnyue elektricheskie mashiny (Non-contact Electric Machines), Moscow, Vysshaya shkola, 1990, 416 p.
5. Apsit V.V. Sinkhronnye mashiny s kogteobraznymi polyusami (Synchronous Machines with Clawlike Poles), Riga, AN Latviiskoi SSR, 1959, 300 p.
6. Dubenskii А.А., Kovalev L.K., Modestov K.A. Vestnik Moskovskogo aviatsionnogo instituta, 2013, vol. 20, no. 4, pp. 146-158.