Neil Baylis wrote: > I don't think you can use the Fairchild part to drive a servo motor with > sinusoidal commutation, because it uses a PLL to compute the phase angle. > This implies they expect it to be continually running, and not changing > direction. > Yes, yes! I meant to comment on this, also. The PLL would kind of break down at very low speeds, since it has no encoder input, when the Hall signals come to a stop, it would pretty much have to turn into a six-step drive. But, maybe it would be smooth enough at really low speeds that it wouldn't be a problem there, either.
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