The magnetic circuit may be analysed using analytic methods, which are heavily dependent on the availability of test results for machines with the same internal geometry. A more modern method, which has become viable due to the increase in speed of computing, is the Finite Element Method, which may be used to predict the performance of magnetic circuits of which one has no previous experience.
Having solved the magnetic circuit, the machine performance is most conveniently predicted using electric circuit techniques.
For many purposes, the steady state equivalent circuit is adequate for analysis. In other cases, it is necessary to use dynamic simulation of the differential equations (Li & Ching, 1997). Some authors use a version of the step by step method used for analysis of synchronous machines (Hammons et al., 1996), or symmetrical component analysis (Jiang et al., 1998) to simulate dynamic conditions.
Losses are important to know, as they determine the self-heating, hence the machine lifetime, and the energy conversion efficiency. Generally, losses are determined from the steady state equivalent circuit model, or from the loss models.
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