Chris J Dixon wrote:
Kevin wrote:

you have not done much research, most model boat motors are 5 pole along
with trains
http://www.zscale.org/articles/fivepole.html

In the model world, maybe, but in the real railway, DC Traction
Motors generally have an even number of poles, most commonly 4 or
6.

Chris
Its general to have an even number of fields or fixed magnet poles, and
windings as a multiple of three.

So it depends what we re talking about.

The normal cheapest electric motor you might find in e.g.an electric
drill will have two magnet poles and three wound armature segments.

Some of the motors I have have 12 wound poles wound as three phases, and
14 magnet poles. For example.