Electric motor with permanent magnet and compressor having the same

An electric motor, comprising:

• a stator;
• and
• a rotor spaced apart from the stator by a gap in a radial direction of the rotor and configured to rotate with respect to the stator, the rotor comprising a rotation shaft and a rotor magnet located at an outer circumferential portion of the rotor,
• wherein the rotor magnet comprises:
• a first magnet configured to generate first magnetic flux, the first magnet comprising:
• a plurality of first magnetic portions arranged in a circumferential direction of the rotor, each first magnetic portion having a first polarity and a second polarity that are magnetically opposite to each other and that are configured to generate a magnetic field in the gap, and
• a plurality of second magnetic portions alternately arranged with the plurality of first magnetic portions along the circumferential direction of the rotor, each second magnetic portion having a first polarity and a second polarity that are magnetically opposite to each other and that are configured to generate a magnetic field in the gap, and
• a plurality of second magnets that are each located between a first magnetic portion of the plurality of first magnetic portions and a second magnetic portion of the plurality of second magnetic portions that is adjacent to the first magnetic portion, each second magnet being configured to generate second magnetic flux that is greater than the first magnetic flux generated by the first magnet, and
• wherein the first magnet is located radially between the gap and the plurality of second magnets.