Okay, so let me get this straight. In a BLDC motor, for every 3 coils there are 2 magnets, alternating between N and S poles toward the coils, right? Nomenclature/terminology question... The number of poles is equal to the number of magnets, or half the number of magnets? Or is it the number of coils in each phase? Is sine wave operation more efficient, or better in any way, than square wave? In square wave operation, one phase is energized with one polarity, one with the opposite, and one not energized, at any given moment, right? More turns per coil increases motor current for a given voltage, right? More turns per coil gives more torque, and lower speed? Within one phase, wiring the coils in parallel or wiring them in series does what, in terms of speed and torque and total output power? What can I do to reduce the heat losses? I know I can just increase cooling capacity but it is better to not produce heat in the first place, since that is lost energy, right? Bigger diameter and more poles gives better operation at low speeds, or no? If I were building a motor from scratch, what would I want to do design-wise, to make it run efficiently at say 1200 rpm or less? The magnetic field produced by a coil has two ends, two poles, so would any increase in efficiency be had by having a rotor comprised of two magnet disks, one at either end from the stator windings, in an axial flux motor, with opposite poles facing the coils? In other words, rotor disk, stator, and another rotor disk, in a sandwich separated by the air gap. I guess it is obvious what I am trying to do here. Maybe I am going up a dead end path, I don't know. Sorry for the monumental post, and all the newbie questions, but I would really like to tackle this project within the next year or so. One more... anybody know any good books it doesn't take a phd to understand? Pdf or other downloads are a big plus. Can't order hardcopy from amazon when I am on a ship.
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