TY - JOUR

T1 - Berührungslose Übertrager als Alternative zu synchronen oder Gegendrehfeld-Erregermaschinen

AU - Weber, Jan Niklas

AU - Ponick, Bernd

N1 - Publisher Copyright: © 2018, Springer-Verlag GmbH Austria, ein Teil von Springer Nature. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2018/3/28

Y1 - 2018/3/28

N2 - Rotating transformers offer the possibility of a speed-independent power transmission to the rotor of an electrically excited synchronous machine without having a negative impact on the dynamics when exciting the main machine. In order to transmit the field current to the rotor, slip rings or brushless exciter machines are commonly used. Slip rings provide a tribological contact between the static and the rotating part of the electric machine and have a limited lifetime. Brushless exciter machines are electrical auxiliary devices that supply the rotor’s field winding contactlessly by converting mechanical into eletrical power. This article presents a new concept for a rotating transformer with a core made of laminated steel. Its operating principle is based on the mechanism of a conventional transformer while the secondary site is rotating. Due to its robustness and a basically unlimited scalability, it is capable of being used in large machines such as hydrogenerators or motors with multi-megawatt ratings. Therefore, a method for the dimensioning and the analytical calculation of rotating transformers is presented in order to predict its transmission behavior and the power losses. The calculation method is confirmed by a comparison of the prediction results with measurements. It is shown that a rotating transformer requires only a quarter of the space of a comparable exciter machine and that the efficiency of the rotating transformer can exceed 98%. Furthermore, it has no relevant impact on the rise time of the field current.

AB - Rotating transformers offer the possibility of a speed-independent power transmission to the rotor of an electrically excited synchronous machine without having a negative impact on the dynamics when exciting the main machine. In order to transmit the field current to the rotor, slip rings or brushless exciter machines are commonly used. Slip rings provide a tribological contact between the static and the rotating part of the electric machine and have a limited lifetime. Brushless exciter machines are electrical auxiliary devices that supply the rotor’s field winding contactlessly by converting mechanical into eletrical power. This article presents a new concept for a rotating transformer with a core made of laminated steel. Its operating principle is based on the mechanism of a conventional transformer while the secondary site is rotating. Due to its robustness and a basically unlimited scalability, it is capable of being used in large machines such as hydrogenerators or motors with multi-megawatt ratings. Therefore, a method for the dimensioning and the analytical calculation of rotating transformers is presented in order to predict its transmission behavior and the power losses. The calculation method is confirmed by a comparison of the prediction results with measurements. It is shown that a rotating transformer requires only a quarter of the space of a comparable exciter machine and that the efficiency of the rotating transformer can exceed 98%. Furthermore, it has no relevant impact on the rise time of the field current.

KW - brushless exciter

KW - electrically excited synchronous machine

KW - rotating transformer

KW - slip rings

UR - http://www.scopus.com/inward/record.url?scp=85044472646&partnerID=8YFLogxK

U2 - 10.1007/s00502-018-0601-z

DO - 10.1007/s00502-018-0601-z

M3 - Artikel

AN - SCOPUS:85044472646

VL - 135

SP - 204

EP - 212

JO - Elektrotechnik und Informationstechnik

JF - Elektrotechnik und Informationstechnik

SN - 0932-383X

IS - 2

ER -