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A few years ago, ST proposed a method called direct back-EMF detection in the APEC conference. The conventional method requires motor neutral point to get the zero crossing information. The direct back-EMF sensing does not need the neutral. The terminal voltage is directly fed into a dedicated low cost microcontroller and only three resistors are required to sense the back-EMF. The system is very simple.
PTM Published on: 2015-04-06
