Rotary electric machine equipped with magnetic flux variable mechanism

A rotary electric machine comprising:

• a stator around which a stator coil is wound;
• a rotor including a rotor core in which a permanent magnet is embedded, the rotor being placed on an inner peripheral side from the stator via a predetermined gap;
• and
• a magnetic flux variable mechanism configured to change a magnetic flux directed to the stator coil from the permanent magnet of the rotor core according to a rotation speed of the rotor, the magnetic flux variable mechanism including:
• a case body fixed to an axial end surface of the rotor core at a position facing the permanent magnet without the centrifugal force applied to the mover via the cam member;
• a mover provided in the case body, the mover being configured to be restricted from moving in an axial direction and to move in a radial direction upon receipt of a centrifugal force corresponding to a rotation speed of the rotor;
• a magnetic flux short circuit member provided in the case body, the magnetic flux short circuit member being configured to be restricted from moving in the radial direction and to move along the axial direction;
• a cam member fixed to the magnetic flux short circuit member, the cam member including a cam surface inclined at a predetermined inclination angle in a direction distanced from the axial end surface of the rotor core as the cam surface goes toward an outer peripheral side along the radial direction, the cam surface facing the mover and making contact with the mover, and the cam member being configured to convert a radial movement of the mover received by the cam surface into an axial movement of the magnetic flux short circuit member;
• and
• biasing springs configured to give a biasing force to the magnetic flux short circuit member in the direction distanced from the axial end surface of the rotor core, the biasing springs being configured to determine a position of the magnetic flux short circuit member along the axial direction in a state where the biasing force is balanced with the centrifugal force applied to the mover via the cam member.