A general approach to sizing and power density equations for comparison of electrical machines

Abstract
Based on the concept of power converter-fed machines (CFMs), an optimal machine design can be considered as the best match of the machine topology, the power electronic converter and the performance specification. To compare the power production potential of machines with various topologies with different waveforms of back EMF and current, a general purpose sizing equation and power density equation are needed to compare the main dimensions and power of such machines. In this paper, a general approach is presented to develop and to discuss these equations. Sample applications of the sizing and power density equations are utilized to compare the induction machine and the doubly-salient permanent magnet machine.

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