Carnegie Mellon University
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Dynamically-Stable Mobile Robots in Human Environments
Head: Ralph Hollis
Contact: Ralph Hollis
Mailing address:
Carnegie Mellon University
Robotics Institute
5000 Forbes Avenue
Pittsburgh, PA 15213
Associated lab(s) / group(s):
 Microdynamic Systems Laboratory
Project Homepage
News and Media
Omnidirectional Mobile Robot Has Just Two Moving Parts
October 04, 2016. More than a decade ago, Ralph Hollis invented the ballbot, an elegantly simple robot whose tall, thin body glides atop a sphere slightly smaller than a bowling ball. The latest version, called SIMbot, has an equally elegant motor with just one moving part: the ball. The only other active moving part of the robot is the body itself. Its spherical induction motor (SIM) eliminates the mechanical drive systems used on previous ballbots and is less likely to suffer mechanical failures.
Bossa Nova Develops Commercial Version of Ballbot
October 23, 2012. Bossa Nova Robotics, a company founded by Robotics Institute PhD alumnus Sarjoun Skaff, announced Oct. 23 at the RoboBusiness Leadership Summit that it is producing mObi, the first commercially available robot that uses a unique locomotion technology pioneered by the Robotics Institute’s Ralph Hollis in his Ballbot robot.
Ballbot : A Single-Wheeled Balancing Robot

September 10, 2015 - Length: 7:16