An aspect of the disclosure relates to an interior permanent magnet motor capable of reducing the number of permanent magnets and exhibiting high performance.

According to an aspect of the disclosure, an interior permanent magnet motor may include a stator provided with a plurality of slots; a rotor rotatably disposed inside the stator; a plurality of permanent magnets disposed at equal intervals in a circumferential direction inside the rotor and having an equal polarity; and a plurality of flux barriers provided on left and right sides of one end of each of the plurality of permanent magnets adjacent to an outer circumferential surface of the rotor, wherein a ratio of a number of slots of the stator to a number of magnetic poles of the rotor is 3:2 or 3:4, and wherein a number of the plurality of permanent magnets provided in the rotor is ? of the number of magnetic poles of the rotor.

A pole arc angle θm of each of the plurality of permanent magnets may satisfy following formulas:
θn≤θm<θm+θs/2
θn=360/P
θs=360/S

where P is the number of magnetic poles of the rotor, and S is the number of slots of the stator.

A pole arc angle θm of each of the plurality of permanent magnets and the plurality of flux barriers may satisfy following formulas:
θs/2≤θib<θn
θn≤θm<θob
θm<θob<θm+θs
θn=360/P
θs=360/S

where θib is an inner flux bather angle of the permanent magnet, θob is an outer flux barrier angle of the permanent magnet, P is the number of magnetic poles of the rotor, and S is the number of slots of the stator.