[JRMichler]

A few random tips if you are designing a motor:

1) End turns add weight and resistance. Minimize them.
2) Use thin laminations of high permeability electrical steel for the magnetic circuit. Low stress machining, properly deburr.
3) Balance the magnetic circuit between steel and copper. Pole iron area, copper area, and back iron.
4) Minimize voltage between adjacent wires. Especially important between phases.
5) Enough electrical insulation to handle the peak voltage at that point. Don't forget switching transients.
6) Consider the effect of thermal stresses in the insulation system. This is one of the biggest motor killers.
7) Design frame for peak mechanical loads.
8) Minimize rotor / stator gap. Take into account ALL machining tolerances, assembly tolerances, thermal expansion, and deflections under load.
9) There's a lot more......

I have worked on motor development. Building a motor good enough to drive a vehicle is a much bigger job than it looks like at first glance.