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BLDC and odd vs. even number of poles
2

BLDC and odd vs. even number of poles

BLDC and odd vs. even number of poles

(OP)
A question that boggles me  about BLDC poles is that  I've noticed some cases of BLDC's with odd numbered poles like 9 for example, Aren't they supposed to come in pairs so the flux can always have a straight line to "flow" to, and an exclusive opposite pole?

RE: BLDC and odd vs. even number of poles

Is that 9 poles or 9 pole pairs? Poles sometimes refers to pole pairs instead of individual poles. Confusing, yes.
(A 2 pole induction motor will actually have 6 individual poles.  1 pair for each of 3 phases.)

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: BLDC and odd vs. even number of poles

I've been in the servo business for about 25 years now, and never seen a motor specified to have an odd number of poles. I agree with your instincts that you must have a matching number of north and south poles on the rotor. Like waross, I wonder if the specification was for number of pole pairs.

Curt Wilson
Delta Tau Data Systems

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