Electric machine with hybrid-excited rotor

摘要

Electric machine (10) having a stationary stator (12) carrying a preferably multi-phase stator winding (13) and having a rotor which cooperates with the stator via a working air gap (16) and a plurality of permanent magnets over its circumference in a predetermined sequence (17) and by at least one excitation coil (18) electrically excited poles, wherein the number of poles of the rotor depending on the strength and direction of an excitation current (Ie) in the at least one excitation coil reversible, and the at least one excitation coil (18) with a Step size (SW) on the circumference of the rotor (11) is arranged, which corresponds to the pole pitch (Pt) of the smaller number of poles, characterized in that the rotor (11) only one, in diametrically opposed grooves (19) used exciter coil (18) divided at the winding heads (20) is guided around a rotor shaft (21) and with at least two ange¬ between the grooves (19) on the rotor circumference rdneten, diametrically opposed permanent magnets (17) cooperates.