Hello!
A bin cage works very well. You can get really large ones for really cheap. Take a look on youtube as there are some really good tutorials on there on how to make them hamster friendly.
How big is your hamster cage? It may be a case of cage rage. And also do you have a wheel that he can run on? If so how big is it and what sort of wheel is it? (plastic, wired etc?)
Hope this helps
