Motor-generator
Another setup for pulse motor – rotor with two magnets and stator of one coil winded by 7 wires (7-filar). 3 wires of coil connected to power source (6V bat) and 4 wires connected to pickup circuit (rectifier and cap). When it runs it work as a motor (3 wires from battery) and as a generator (4 wires pickup) in the same time, even build-up voltage on capacitor up to 11V after 5min of running. The bigger the coil and magnets the more voltage gets on the capacitor but with the same power input.