The wheel is round the half moon shape is the track the wheel or pulley to run on. The path the wheel runs on to make it spin and rotate the belt rotates the alternators and the alternators maintain a set power storage. It comes down to the amount of air it takes push a piston up a tube to lift the pulley, so gravity, weight and tension can force the wheel downward on the track. A trigger sets off the spurt of air that lifts the wheel to the top of the slanted half moon and the process begins again and there is no loss or slowing of the system even when the dc motor is off. Is it still like the motor your talking about Recca02?