Interior permanent magnet motor

An internal permanent magnet motor, comprising:

• a stator of an annular shape;
• and
• a rotor coaxially disposed inside the stator with a gap between the rotor and the stator, wherein a plurality of permanent magnets is embedded in the rotor and spaced from each other in a circumferential direction of the rotor along a circumference of the rotor,
• wherein the stator has at least a first notch formed on an internal circumferential surface facing the rotor in a direction perpendicular to a circumferential direction of the stator,
• wherein the rotor has a least a second notch formed on an external circumferential surface of the rotor facing the internal circumferential surface of the stator in a direction perpendicular to a circumferential direction of the rotor,
• wherein the at least a first notch includes two first notches formed at each of the plurality of shoes with a predetermined interval, and
• wherein a center of each of the two first notches formed at each of the plurality of shoes in the circumferential direction of the stator and a center of each of the plurality of shoes in the circumferential direction of the stator form an angle A1 with respect to a number of slots of the stator based on a center of the stator as follows:
• 24
• S
• ×
• 2.4
• ≤
• A
• 1
• ≤
• 24
• S
• ×
• 4.8
• ,
• wherein S denotes the number of slots of the stator.