Hello Here I Am, The US patent office won't accept a patent for a perpetual motion device. My advice would be to draw it out and write a short story about how you came to inventing it. Describe exactly how it works and all information that you believe is relevant. Send it off to the copyright office and get a copyright on the written material. Tell them it's a book. At least this will give you some proof that the idea was original and when it was conceived.
Try running this by an attorney see what they say.