Determining the number of rotor poles BLDC motor

Thread Starter

electronicsLearner77

Joined May 26, 2012
125
I want to know the number of rotor poles. Can i use the following method? I mark the start point. I slowly rotate and note the Hall changes and see how many times the hall code repeats when it comes back to original position. Is it correct method?
 

MaxHeadRoom

Joined Jul 18, 2013
19,199
Usually it is quite evident. But alternatively you can monitor one of the Hall outputs with a meter.
The PDF shows the corresponding BEMF of the windings, for this display on a D.B. scope, you need to set up a virtual neutral, wire a 10k res to each phase and connect all three ends together and make this scope GND.
Rotate at a low rpm
Max.
 

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