POSITIONAL RECOGNITION USING BEMF ZERO CROSSOVER RECOGNITION OF A ROTOR OF AN ELECTRONICALLY COMMUTATED ELECTRIC MACHINE WITH TWO COIL SECTIONS OF DIFFERENT INDUCTANCES

摘要

A method for detecting the position of a rotor (4) of an electronically commutated electric machine (2), in which a zero crossing (38) of a in a strand (13, 15) of the rotor (4) or stator (5) induced voltage is used for detecting the position and for the determination of the zero crossing (38) of the strand (13, 15) is switched off for a short time, with a rotor (4) / stator (5), of the at least two strands (13, 15), of which the means of a relative to the other smaller inductance, characterized in that, for the position recognition only the strand (15) with the small inductance is used, and wherein a rotor (4) / stator (5) with stator teeth (8) is used, which in each case a tooth base (9) and two tooth heads (10), around the tooth bases (9) of the rotor (4) / stator (5) of one of the strands (13) and around the tooth heads (10) of the rotor (4) / stator (5), a different of the strands (13,15) is arranged and for the smaller of the inductance of the tooth heads (10) situated on the strand (15) is used.