Automatic Variable Magnetic Flux Technique in Consequent Pole Type PM-Motor Utilizing Space Harmonic

Abstract

This paper proposes a consequent pole type pancake-axial-gap variable magnetic flux PM-motor. The unique point of the proposed motor is that variable magnetic flux can be realized by the armature magnetomotive force, rotation speed and/or current phase. The back yokeless stator is adopted to constitute a series magnetic circuit, and the variable magnetic flux is realized by passively changing the magnetization amount of the image pole (iron pole) of the consequent pole structure. The magnetic circuit topology that realizes the above will be explained, and the magnetic circuit design of the optimum variable magnetic flux method will be studied by FE-analysis. In addition, the basic drive performance will be clarified by FE-analysis. Furthermore, the prototype for principle verification will be revealed.