Supercharger

A supercharger comprising:

• a magnetic flux switching motor;
• and
• a wheel,
• wherein the magnetic flux switching motor includes
• a rotor;
• a stator that is an annular member storing the rotor to make the rotor rotatable therein and includes a plurality of stator projecting portions projecting inward in a radial direction from an internal circumferential portion toward the rotor;
• a field source that is provided in a field slot serving as a part of a plurality of slots formed between the stator projecting portions to generate a magnetic field of a constant direction;
• an armature coil that is provided in an armature slot serving as another of the slots;
• and
• a controller that applies a single-phase current to the armature coil and changes a direction of the applied single-phase current to change a direction of a magnetic field generated from the armature coil and rotate the rotor, and
• the wheel is attached to the rotor, and rotates together with rotation of the rotor to compress the air.