Why Do DC Brushless Motors Need Hall/EMF Sensors?

jeudi 31 octobre 2013

I understand the basic gist of the whole DC brushless motor, but I don't understand why there needs to be a sensor. Why can't the controller just alternate between phases at a constant rate? What I mean is that if there are a fixed number of ways the coils can be charged, why not just alternate between them and keep going? I hope my question makes sense.






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