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38 / 38 PC-IMD GoFER User's manual for finite-element GoFER in PC-IMD 9.04 3-July-14 © Copyright 2014 Computational Dynamics Ltd., CD-adapco Contents Finite-element analysis with the induction motor — general comments.. . . . . . . . . . . . . . . . . . iv 1. Using finite elements with PC-IMD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Single load point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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  38 / 38 PC-IMD GoFER User's manual for finite-element GoFER  in  PC-IMD  9.043-July-14© Copyright 2014 Computational Dynamics Ltd., CD-adapco   Contents Finite-element analysis with the induction motor — general comments...................iv1. Using finite elements with PC-IMD.............................................12. Single load point.............................................................43. Slot permeance..............................................................154. No-load rotate...............................................................225. No-load ranging.............................................................296. On-load rotate...............................................................36Index.............................................................................37  Finite-element analysis with the induction motor — general comments With the induction motor, a magnetostatic finite-element calculation is not going to give very muchhelpful information, because the processes in the induction motor are essentially asynchronous. All weare going to get is a momentary snapshot of the flux, or a series of snapshots. This is quite different fromthe situation with the synchronous machine.Because of the slotting and the small airgap, the flux-density distribution in the airgap is extremelyheavily modulated, as we can see in Fig. 12 on p. 14. What is most important about this waveform is the fundamental, since it produces the torque. MatchFE | Show fundamental  [ F ] can be used to show thefundamental components. It is dangerous to assume that the finite-element result is more correct thanthe analytical result, and equally dangerous to read too much into it. Test data tends to show that  PC-IMD  is the more reliable of the two, even at no-load when there is no current in the rotor.The harmonics in the flux-distribution contribute to the stray loss, but the Bgap distribution in Fig. 12is useless for this purpose because it is taken in the air and not in the iron. Moreover, all it shows is asingle instant, with no information about the time-variation. Moreover, the effects of skew are notincluded in the finite-element analysis, which is purely 2-dimensional.To summarize this, the finite-element method used with the induction motor (as we have it in  PC-FEA )is of limited engineering use, except possibly for checking a few flux-densities and generating prettypictures. For design work it is generally safer to use  PC-IMD  by itself, as it is a more mature programwith greater analytical depth. It is possible that more sophisticated finite-element programs can produce useful engineeringcalculations for the induction motor, but only at the expense of very long solution times.
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