caa a22 4500 463206193 CHVBK 20180405153127.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s00202-006-0053-z doi (NATIONALLICENCE)springer-10.1007/s00202-006-0053-z Current flow and losses in brushless exciters with polygon-connected windings and dc rectifiers [Elektronische Daten] [Oliver Drubel, Rolf Gantenbein, Alberto Izquierdo, Meinolf Klocke] The current flow within a salient pole brushless exciter with polygon-connected winding is calculated. The winding is connected to a rectifier, which causes transients in the winding during switching. Brushless exciters are over-dimensioned for their rated operation. During ceiling conditions the required voltage may be two times higher and the exciter is strongly saturated. Therefore the normal asynchronous circuit theory is no longer applicable for a detailed study within the exciter itself. A nonlinear finite difference time stepping method with rotating rotor and diode circuits is applied instead. Basic theories for the combination between the circuit theory and field theory are summarized in one mathematical model. Calculation results are compared to measurements on a real power plant exciter for different operation conditions. Springer-Verlag, 2007 Brushless exciter nationallicence Diode currents nationallicence Finite difference method nationallicence Power electronics nationallicence Drubel Oliver Siemens AG, Nürnberg, Vogelweiherstr. 1-15, 90441, Nürnberg, Germany aut Gantenbein Rolf ALSTOM (Switzerland) Ltd., Turbogenerators, Zentralstr. 40, 5242, Birr, Switzerland aut Izquierdo Alberto ALSTOM (Switzerland) Ltd., Turbogenerators, Zentralstr. 40, 5242, Birr, Switzerland aut Klocke Meinolf Fakultät für Elektrotechnik und Informationstechnik Lehrstuhl für Elektrische Antriebe und Mechatronik, Universität Dortmund, Emil-Figge-Str. 70, 44221, Dortmund, Germany aut Electrical Engineering Springer-Verlag 90/1(2007-11-01), 55-63 0948-7921 90:1<55 2007 90 202 https://doi.org/10.1007/s00202-006-0053-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00202-006-0053-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Drubel Oliver Siemens AG, Nürnberg, Vogelweiherstr. 1-15, 90441, Nürnberg, Germany aut NATIONALLICENCE 700 1- Gantenbein Rolf ALSTOM (Switzerland) Ltd., Turbogenerators, Zentralstr. 40, 5242, Birr, Switzerland aut NATIONALLICENCE 700 1- Izquierdo Alberto ALSTOM (Switzerland) Ltd., Turbogenerators, Zentralstr. 40, 5242, Birr, Switzerland aut NATIONALLICENCE 700 1- Klocke Meinolf Fakultät für Elektrotechnik und Informationstechnik Lehrstuhl für Elektrische Antriebe und Mechatronik, Universität Dortmund, Emil-Figge-Str. 70, 44221, Dortmund, Germany aut NATIONALLICENCE 773 0- Electrical Engineering Springer-Verlag 90/1(2007-11-01), 55-63 0948-7921 90:1<55 2007 90 202 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer