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Ceramic-like composite systems for winding insulation of electrical machines

 
: Miersch, Sören; Schubert, Ralph; Schuhman, Thomas; Schuffenhauer, Uwe; Buddenbohm, Markus; Beyreuther, Markus; Kuhn, Jeannette; Lindner, Mathias; Cebulski, Bernd; Jung, Jakob

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Institute of Electrical and Electronics Engineers -IEEE-; IEEE Industrial Electronics Society -IES-:
International Conference on Electrical Machines, ICEM 2020. Proceedings : 23 - 26 August 2020, Online
Piscataway, NJ: IEEE, 2020
ISBN: 978-1-7281-9946-7
ISBN: 978-1-7281-9945-0
S.1540-1546
International Conference on Electrical Machines (ICEM) <2020, Online>
Englisch
Konferenzbeitrag
Fraunhofer IKTS ()
electric machines; insulation technology; ceramics; thermal variables measurement; cooling; thermal analysis; numerical simulation; traction motors; modular machines; outer rotor

Abstract
Insulating sheets, impregnants and encapsulation materials commonly used for winding insulation offer low thermal conductivities. This leads to an increased heating of the winding of electrical machines and to the existence of hotspots. The electromagnetical utilization of the machine has to be reduced with respect to the allowed maximum winding temperature. In this paper, the development and experimental investigation of novel polysiloxane composites with ceramic fillers are presented. The materials are tested by means of impregnated and encapsulated samples of a round-wire winding as well as the main insulation of electrical steel sheets and laminated cores. Numerical models are implemented for determining the equivalent thermal conductivity of the winding compound comprising the enameled wire and the impregnant. Based on the example of a permanent-magnet synchronous machine with outer-rotor in modular construction, the potential for increasing the electromagnetical utilization is shown.

: http://publica.fraunhofer.de/dokumente/N-622202.html