Thanks.Depending on the manufactured quality, new motors may have somewhat different torque to voltage curves. Likewise, driver circuits built from 10% tolerance parts will often be a bit different. IN this case I suggest exchanging te driver circuits to see if it is the driver circuit or the motor. If the motors are not both new, then the condition of the commutators may be different, or there may be a mechanical difference.
Now a question: Is this bias apparent at all speeds? Or only at some low speed? That could indicate a difference in threshold of some active device.
Thanks.It might also be a mechanical difference between the two motors. AND, if they are rotating in opposite directions because of being on opposite sides of the vehicle, it is very possible that the brushes are positioned to favor one direction. That is often done with motors for some applications. So if the brush positions re adjustable that is one more thing to check.
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by Jeff Child