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bldc controllers can provide tach style rpm signal data either as a frequency or voltage or, wait for it: digital signal. Some can tell you how much power is being requested, some how much applied, or both but it's an easy sample on one pair of motor leads. Automotive controllers have all sorts of data on the OBD data bus indicating stuff you never care about if you can decipher it.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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