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Originally Posted by Andy Baker
This issue has been debated many times on this website. There is no reversing setting. The motors are wound in order to provide maximum power in one direction (the forward direction on the drill is where the power is needed).
Here are the various solutions:
1. Change your mechanical design so that both motors run to same direction to propel your robot.
The positive outcome of this effort would be that the 'bot would run straight.
The negative is that it takes some effort (more complexity, weight, efficiency loss, etc.) to make it work.
2. Create software which limits the forward-rotating motor in order to match the speed of the motor moving in reverse.
3. Deal with it and let your drivers just get familiar with driving in slight arcs.
Andy B.
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4. Another way to deal with this is to put a speed measurement on each drill motor (say with an encoder). You can then run the drill motors in closed loop mode.
In 2003, this was just a barely possible solution, especially if you used encoders in your preprogrammed mode. In 2004, with the more versatile controller and tight control over the timing, this may be the best way to accomplish this task.
BTW, can anyone actually explain how they have wound the motors so that they have different power in forward versus reverse? Is there an assymmetry in the coils or in the magnets? I agree that there is an assymmetry. I just don't see how it is done or how it would be cheaper.