A drive arrangement for a treadmill includes an electric motor having a stator winding and an armature winding connected in series with each other and in parallel with a rectified power source. The rectified power source has both a DC component and an AC component. The series-connected motor is capable...http://www.google.es/patents/US5141479?utm_source=gb-gplus-sharePatente US5141479 - Drive arrangement for a treadmill
