I have seen some youtube videos where it apparently can be done. Basically with just a copper coil and a stationary magnet. But I don't know if it is true or not. Even though they show many various ways of doing it. If I had the time, I would try it myself and see what happens. I will try to download the videos. But I never have very good luck with that.
I finally figured out how to get a video to show up. You insert the video link and insert it. Then get rid of anything besides the actual link that shows up.