Patent ID: 7397159

Claim:
A rotary electric apparatus, comprising: a rotation shaft having an axial direction about which the rotation shaft rotates; a rotor including a first rotor member and a second rotor member each generating magnetic flux providing a field and being secured at different positions along the axial direction of the rotation shaft; a stator facing the rotor with a predetermined-size air gap therebetween and including a first stator member and a second stator member each of which is equipped with armature coils through which armature current is supplied for synchronous rotation between the rotor and the stator; a skewing structure mutually skewing the first rotor member and the second rotor member such that a first phase angle θ 1 of the magnetic flux generated by the first rotor member differs from a phase angle θ 2 of the magnetic flux generated by the second rotor member, the first phase angle θ 1 and the second phase angle θ 2 being based on a reference angular position of the rotor providing a maximum of a zero-th component of torque caused in response to the armature current to be supplied in the stator; and a control structure that controls each of an amount Φ 1 of the magnetic flux generated by the first rotor member and an amount Φ 2 of the magnetic flux generated by the second rotor member such that the amounts Φ 1 and Φ 2 differ from each other so as to reduce a difference between a maximum amplitude of a predetermined-order harmonic component F 1 of an electromagnetic force caused by a pair consisting of the first rotor member and the first stator member and a further maximum amplitude of the predetermined-order harmonic component F 2 of an electromagnetic force caused by a further pair consisting of the second rotor member and the second stator member, wherein the rotor is composed of a magnet type of rotor provided with magnets generating the field magnetic flux, both the skewing structure and the control structure being arranged with the rotor, each magnet has a plate-like shape and is embedded in the rotor along the axial direction of the rotor having a cylindrical surface facing the stator, and the first rotor member is different in a width of each magnet from the second rotor member, the width of each magnet being defined as a width of a surface of each magnet, the surface facing a cylindrical surface of the rotor.