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A Pet Robot, Like Boston Dynamics Makes



Every few months, a new video from Boston Dynamics will make rounds on the Internet. This is their advertisement, because unless the military starts buying mechanical mules, Boston Dynamics will soon be out of service. You can see robots being kicked down the stairs, robots go through doors and robots that act like dogs. If a hundred or so highly skilled and highly trained robotists, technologists and other experts can put together a walking dog robot for a decade, of course, a person can cut through the cruise and build one in a basement. That's what [Misha] does. It is the staggering wolf, a robot wolf, or dog or cat, we do not actually know because there is not yet fur (or head). But that's interesting.

The key component of any quadruped robot is a high-torque, low-noise servomotor. This is not a regular brushless motor, and for this application, nine grams of servos goes into the bin. This means custom-made engines, or DizzyMotors. You are looking at a large brushless motor with a planetary gear that is all pushed into something that could actually fit into a robot's wolf's leg.

There is a driver for these engines that is not called DizzyDriver, which is not called BLDC for a direct drive servo motor. It is effectively a smart servo that will move to a particular rotation, receive commands over RS-485, and write back the angular position. This also applies to constant torque. Of course, there is a video of the DizzyMotor and servo driver below.

Building a robot dog walking around the house is one of the most difficult technical challenges out there. You have pretty crazy kinematics, you have to think about the frame's strength, operating systems and ultimately how to fit everything in a compact design. This project hits all the brands and we can't wait to see Dizzy Wolf make a backflip or hunt a ball.


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