>Interwinding capacitances may not increase losses directly but affect >self resonant frequency and actual inductance. >From what I've seen (which is not a great deal :-)) self resonant frequencies can be a lot different for the same rated inductance (between different inductors). I'm in the process of looking for an SMD power choke, around 100uH, and the rated maximum SRFs seem to vary between 5 and 12 MHz, a bit lower than I expected. I suppose unless you take this kind of thing into account, you could up with performance quite a bit different from that expected in an ideal situation. Not sure how this would translate to the stator scenario though (I assume this post is related). Maybe a rough sketch in spice might be helpful for all this, with temperature coeffiecient, saturation, winding capacitances/resistance etc. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist