Monthly Archives: February 2013



We weren’t satisfied with the DC motors – there’s too much gear chatter, not enough torque, and no precision control. So, we upgraded to stepper motors. We built the stepper driver circuit with a current feedback loop, but the H-bridges were overheating. We finally decided to go with an off the shelf solution and bought some stepper driver boards. We will need to make a new prototype to fit the stepper motors on the chassis.