[Al Skierkiewicz]

Paul,
The wire is protected by the breaker sizing. If the motor stalls, the breaker must trip to prevent the wire from going incandescent.
The breakers realistically have a trip charachteristic that allows them to pass more than 600% over current for a short period of time and can pass almost 150% current indefinetely. As strange as it sounds, you can put a 40 amp breaker on a motor that has a 20 amp stall current as long as the wire is #12 AWG or larger. I wouldn't do it, but you could.
BTW, In looking at spec sheets for both the Kayang and Taigene motors, there appears to be an internal, temperature controlled, breaker on both motors.