Robot’s custom-designed electric motors are powerful and
efficient.
A 70-pound “cheetah” robot designed by MIT researchers may
soon outpace its animal counterparts in running efficiency: In treadmill tests,
the researchers have found that the robot — about the size and weight of an
actual cheetah — wastes very little energy as it trots continuously for up to
an hour and a half at 5 mph. The key to the robot’s streamlined stride:
lightweight electric motors, set into its shoulders, that produce high torque
with very little heat wasted.
The motors can be programmed to quickly adjust the robot’s
leg stiffness and damping ratio — or cushioning — in response to outside forces
such as a push, or a change in terrain. The researchers will present the
efficiency results and design principles for their electric motor at the
International Conference on Robotics and Automation in May.