Quote Originally Posted by Karl View Post
there seems to be a suggestion that bipolar parallel would be better(?).
If you look at the graphs, wiring in paralel doesn't actually give you a big torque speed advantage. OTOH, experience shows you will get a lot more heat that needs to go somewhere.

Consider where you will dump that extra heat.

As I understand it, any flaws in the soft iron motor lamination act as little, shorted out, single turn, transformer coils. When you switch the motor windings you generate "eddy currents" around those flaws which heat the lamination. Halving the coil inductance boosts the eddy current heating.

Some reckon that the gain ain't worth the pain.