Permanent magnet rotary electric machine

A permanent magnet rotary electric machine comprising:

• a stator in which a plurality of teeth and a plurality of slots are formed on an inner periphery of a cylindrical stator core, and a winding wire is wound around the teeth so as to be disposed in the slots;
• and
• a rotor disposed in a hollow portion of the stator with an air gap between the rotor and the stator,
• wherein in the rotor, a radial projection is provided on an outer periphery of a rotor core, a number of the projection is 2n or more (n is a natural number equal to or larger than 1), and a ferrite magnet is disposed between adjacent projections,
• wherein a lateral of the projection perpendicular to a projecting direction of the projection and an edge of the ferrite magnet have a shape along the projecting direction,
• wherein a radial height of the projection is less than a thickness of middle of the ferrite magnet and greater than a thickness of the edge of the ferrite magnet, and
• wherein when the thickness of the middle of the ferrite magnet is Lm, the radial height of the projection is Lt, and the thickness of the edge of the ferrite magnet is Lme, a relation of Lm>Lt>Lme is satisfied.