A device for position determination in a sensorless direct current motor has a plurality of inductivities arranged in corresponding phases and inducing alternating voltages in a motor windings, a plurality of resistances located in phase branches to be evaluated for a position determination of a rotor...http://www.google.ca/patents/US6859000?utm_source=gb-gplus-sharePatent US6859000 - Device for position determination in sensorless motors
