While it's unlikely that anyone doing CNC will run into them, there ARE motors with different numbers of coils.
There's even a one-coil version that's common in low cost things like the fan on your computer or in battery powered watches that have actual hands that move. In these the motor typically one runs in one direction.
Also the number of internal lobes on the magnets can vary. Most CNC motors will have two hundred "ticks" that you can feel when turning it with the power off. As a side note to this side note, when microstepping ONLY the base 200 ticks are accurate. Microsteps only approximate the movement between ticks. This can show up as have ripples in your work, the micro steps are close, but not exactly right and it repeats every 1/200th (1.6 degrees) rotation of the motor.
Those 6 and 8 wire motors have 6 or 8 wires for a reason. If gives the user a choice.
All motor have two coils. If they run the ends of the coils out of the motor there are four leads (as each coil has two ends) this is the normal case.
-- Jerry Durand, Durand Interstellar, Inc. www.DurandInterstellar.com tel: +1 408 356-3886 @DurandInterstel
Posted by: Jerry Durand <jdurand@durandinterstellar.com>
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