I happened to replace a 220V 3 ph smart motor and thought it was interesting enough to pass along. This has 3 magnets on the rotor and an 18 pole stator, a 4 inch long 1/2 inch diameter shaft with a D shape . It came off a 5 ton commercial air conditioner squirrel cage fan. These should be readily available form your buddy the HVAC guy since the computer is usually the part that goes out leaving the windings and rotor usable for "projects".