Algodoo

Nope, not perpetual motion. What happens is you have three objects that have the same collision layer (A) that you are binding together with two axles. Imagine trying to force three people together into the same space. They will become extremely agitated and attack each other. That's what is happening with the objects in your scene. You are forcing them together which makes them agitated. So, the resulting shaking, pushing, and pulling will sometimes make them spin, and you are confusing that spin with perpetual motion!