At nominal torque in a given and verified machine design the losses are at equilibrium with the performance of the cooling system. If the machine is overloaded, the phase current has to be risen above the nominal current, leading to higher copper losses that are proportional to the square of the current. Thus, even if the output torque is proportional to the current, overloading will have a serious impact on the thermal behavior. In the following, the torque production principle of SRMs is derived under consideration of the loss generation. The impact of overloading the machine on the thermal behavior is pointed out. A simple dynamic thermal model of an SRM that was derived from measurements will be used to calculate the winding hot spot temperature during load cycling. Two example machines are used for the discussions in this paper. One is a liquid cooled traction drive machine in the 400 Nm class, that is used as example in the first paragraphs. The second machine is a smaller, air cooled industrial machine, originally designed for servo applications in the 1.5 Nm class. Due to limitations of the test bench and the converter for the largest machine and for practical reasons, the small machine will be used to examine overloading
Short term overload capability of switched reluctance drives
Kurzzeitüberlastbarkeit von Schalt-Reluktanzantrieben
2006
8 Seiten, 8 Bilder, 6 Quellen
Conference paper
Storage medium
English
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