PMD functions as follows:
The small motor turns the bicycle-type wheel to the right, turning the drive sprocket also, having it climb the chain, taking the whole assembly with it. At the top the small motor shuts off and the assembly slowely creeps back to the bottom, pulling the chain down with it, turning the transmission/generator, charging a full charge of energy into the battery. As the assembly is climbing the chain by the small motor, it's weight is also pulling down on the chain at the same time, charging energy into the battery as the small motor is taking energy out.
The small motor takes out 1N worth of energy during it's 3 minute ascent.
The ascending assembly's weight charges back into the battery .33N worth of energy during the 3 minutes.
The descent, taking ten times the amount of time with it's slow creep, charges 3.3N into the battery.
1N < (.33N + 3.3N) = 2.63N FE
Appologies for the picture, couldn't figure out how to make it smaller. :(