A perpetual motion in the service of robots?

When I was searching for energy sources that would allow a robot to move, I found projects which related to perpetual motion machines. You can see in the video a few interesting examples: a self-flowing flask, a perpetual train, a Woodwards wheel, a Da Vinci overbalanced wheel. It is interesting that these ideas can be used?

 

pm6

pm5

pm4

pm3

pm2

PM1