Patent ID: 7999432

Claim:
A rotating electric machine system comprising: an armature having an armature coil; a surface magnetic pole having a plurality of magnetic salient poles arranged in a circumferential direction opposing the armature, said surface magnetic pole and the armature being concentric with each other with respect to an axis of rotation and being capable of rotating relatively to each other; and a magnetic excitation part for magnetizing collectively every group of the magnetic salient poles to be magnetized in a same polarity, the magnetic excitation part including a field magnet, a main magnetic pole and a bypass magnetic pole, and the field magnet having a first magnet pole which represents one of N pole and S pole of the field magnet and a second magnet pole which represents the other pole of the field magnet, the first magnet pole facing the main magnetic pole and the bypass magnetic pole; wherein the first magnet pole, the main magnetic pole, the magnetic salient pole, the armature, the bypass magnetic pole and the second magnet pole are arranged to form a main magnetic flux path in which a magnetic flux flowing from the first magnet pole to the main magnetic pole returns to the second magnet pole through the magnetic salient poles and the armature, and a bypass magnetic flux path in which the magnetic flux flowing from the first magnet pole to the bypass magnetic pole returns to the second magnet pole mainly in the magnetic excitation part, the main magnetic flux path and the bypass magnetic flux path being connected to the field magnet in parallel; either one of the field magnet and the unit of the main magnetic pole and the bypass magnetic pole is composed as a movable magnetic pole part capable of being relatively displaced to the other one so as to change the area where the first magnet pole faces the main magnetic pole, and the area where the first magnet pole faces the bypass magnetic pole, with a sum of the areas being kept substantially constant; and an amount of the magnetic flux flowing through the armature is controlled by displacing the movable magnetic pole part according to an output of the rotating electric machine system so that the output is optimized.