{HEAD ~ Variable pulses} of an electric voltage are applied to {TAIL ~ the electric motor} in such a way that the rotor of the electric motor moves at a rotational speed which can be set 
are applied to
{ HEAD ~ Variable pulses } of an electric voltage are applied to { TAIL ~ the electric motor } in such a way that the rotor of the electric motor moves at a rotational speed which can be set
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH