Udema, S.; Fräger, C.: Rotary Transformer for Contactless Excitation of Synchronous Machines Fed Through Neutral Conductor, International Electric Machines & Drives Conference (IEMDC), pp. 1724-1730, San Diego, USA. 2019.
Udema, S.; Fräger, C.: Brushless Excitation System for Synchronous Machines with Rotary Transformer supplied by Common Mode Voltage, Innovative small Drives and Micro-Motor Systems (IKMT), pp. 146-151, Wurzburg, Germany. 2019.
Udema, S.; Fräger, C.: Design of a Highly Efficient Electrical Excited Salient-Pole Synchronous Machine Utilizing an Optimization Algorithm, Innovative small Drives and Micro-Motor Systems (IKMT), pp. 24-29, Saarbrucken, Germany. 2017.
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