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Embedded Systems October 2000 Vol13_11

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SPECTRA . magnet motor. The primal·y diffe r- e nce is that th e induction mOlor has a wound armature instead of perma- ne nt magnets. The armature i mag- netized by the stator windings; this is the [d component in Equation 1 URIS Fluxes in a brushless permanent magnet motor . Winding Flux Id -------', " Torquing flux ',-- - - · Iq Magnet Flux Don Morgan is senior engineer at Ultra Stereo Labs and a consultant with 25 years' experience in signal processing, embedded systems, hardware, and software. Morgan recently completed a book about nurnerical methods, Jeaturing multi-rate signal jJrocessing and wavelets, called Numerical Methods for DSP Systems in C. He is also the author oj Practical DSP Modeling, Tech niques, and Programming in C, published by John Wilt)' & Sons, and Numerical Methods for Embedded Systems from M&T. Don's e-mail addressisdgrn@baykitty.com. that must now be supplied to the motor. As a resu lt , an induction motor requires approximately one- third more current to run than a comparable permane nt magnet motor. Next month, we dig more deeply into the PID algorithm and the meaning of the terms and coefficients. esp 154 oaoBER 2000 Embedded Systems Programming

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