Referring to FIG. 16, in the case of the interior permanent magnet motor 100 having the rotor 120 provided with the flux barriers 125, 126, 127, and 128, the waveform of the voltage induced in the motor 100 is substantially bilaterally symmetrical so that the distortion rate of the counter electromotive force is small. However, in the case of the interior permanent magnet motor 100′ having the rotor 120′ having no flux barrier, the waveform of the voltage induced in the motor 100′ is not bilaterally symmetrical so that the distortion rate of the counter electromotive force is large.

Referring again to FIG. 11, a plurality of inner flux barriers 129 may be provided between the through hole 121 in which the rotation shaft of the rotor 120 is disposed and the plurality of permanent magnets 130. The inner flux barriers 129 are spaced apart by a predetermined distance from the outer circumferential surface of the through hole 121 and are formed to have a predetermined width and length along the outer circumferential surface of the through hole 121. The plurality of inner flux barriers 129 may prevent the magnetic flux from leaking into the rotor 20, thereby increasing the magnetic flux interlinked with the coils of the stator 110.

FIG. 17 is a partially enlarged cross-sectional view illustrating an interior permanent magnet motor according to an embodiment of the disclosure.

Referring to FIG. 17, an interior permanent magnet motor 200 according to an embodiment of the disclosure may include a stator 210 and a rotor 220.