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Originally Posted by What's_nitro?
Yes we are giving the coils square wave drive pulses, and the BEMF would also be a primarily square wave. But, the BEMF pulse is influenced by the present magnetic field to the effect of a sinusoidal wave being factored in as the rotor passes each coil. The same is true for wye winds or delta winds. So if you filter out the inverse of the drive pulse, timing included, you'll be left with a sinewave.
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I was just about to post that exactly. Well said.
Oh, seen the video before, love it.:005: