Nope, the steel/iron core is what amplifies the magnetic forces. Without it the motor wouldnt have enough power to turn itself lol or enough to generate anything useful.
EDIT: I'd just like to say something, whilst I am saying that its impossible and everything, please dont let me stop you from trying and having fun at the same time. Without people trying to do things that are believed impossible or non existant the world will never progress, 100 years ago scientists thought that most things had already been discovered. Look how much has changed since then. Its quite possible that many of the things we believe about physics are false, unlikely but possible none the less. I personally believe we know most things correctly about basic physics. Quantum physics is a whole new ball game though. Good Luck.