I ask this because somehow dc motor is something that acts like a coil for the incoming pulse however it won't revert polarity... it works like a kind of capacitor... but a capacitor that will charge with current...
i think there's this 5 types of components and they are not exactly the same... transformers, motors, generators, coils and capacitors
a motor in parallel with the cell would give a sort of pulsing character to the dc since each time the commutator pass it will such amps...