No, it is nothing more than a flywheel. You can only harness less power than you put in. Any more and it will quickly come to a stop, as you will discover.
Take a space satellite like the ISS. Its a couple hundred km up, but the gravity up there is only slightly less than it is here on earth. Therefore its been pulled down, falling, very quickly towards the earth. But, its also moving at right angles to the center of the earth, at such a speed, that even though its falling, the earth's surface is also falling away due to the curvature of the planet. Therefore, the IIS is constantly falling. If the IIS stopped is forward movement, it would plummet to the earth in a few minutes due to gravity.
The IIS is therefore acting like a flywheel. Even though its got lots of speed, and gravity acting on it, if you take any energy out of its forward movement, it would quickly slow down and fall to earth.
Forget the crap about gravity motors and changing the center of gravity. It's rubbish. All you are creating is a device to change one type of motion to another. You can ONLY extract less power than you put in, or it will quickly slow down and stop.