Does anyone know about BLDC motor sensorless control?

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U. Dreher

Dump the hall sensors ("sensorless" excludes the use of hall sensors!) and compute the zero-crossing of the back EMF (effectively replacing what initially came from the hall sensors) !

Maybe the following article will help you to better understand;

https://www.digikey.de/en/articles/controlling-sensorless-bldc-motors-via-back-emf