A PMD that I was trying to ask is something that will keep on moving without the aid of air, water and solar energy, which is widely being used nowadays, and which I would say is somewhat unreliable unless you have a battery bank to store the gained energy until it becomes available again.
A PMD from a source that is always available that will keep the device moving and will have an excess energy, unlike other PMD that once you a apply a little resistance, will eventually stop.

Australians claims they already have one using magnets. But neither with the aid of magnets.

Do you think it is possible?