Additional field coils around motors

[KenWittlief]

I second what Al said. With the total current limits imposed on the robot (by the rules and the main breaker) and with the 12V battery a bot can pull approx 2HP from the battery continuously

that is a LOT of power! A healthy 18 yr old male can put out about 1/3 HP continuously for 2 minutes, therefore the power available to your bot is the same as having six young men exherting themselves to their full capacity.

If your bot is expending that much power for the entire 2 minute match then something is seriously wrong with the design of the machine. Most of that energy would have to be fighting against itself, not other robots. For example: tank steering with 6 rubber tires or tank treads, that takes full power just to turn, compaired to a bot with 6 omniwheels, that can spin around as easily as it can move forwards or backwards.