Motor and compressor

A motor, comprising:

• a rotor comprising a rotor core, two or more first slots arranged in a circumferential direction of the rotor in the rotor core, two magnets in a plate shape having a thickness in a radial direction of the rotor, and divided and arranged in the circumferential direction in each of the two or more first slots, and a spacer for dividing the two magnets;
• and
• a stator disposed outside of the rotor in the radial direction with a clearance from the rotor and comprising a stator core having two or more second slots wound with one or more winding wires;
• wherein an opening of each of the two or more first slots has a substantially rectangular shape, wherein two opposite sides of the opening are perpendicular to a radial direction of the rotor,
• wherein the two magnets have the same magnetic pole of S or N in their radially outer side and the same magnetic pole of N or S in their radially inner side, and are separated from each other by the spacer, by a distance which is 10% to 50% of a circumferential length of the slot having the two magnets,
• wherein the spacer is a non-magnetic solid material that occupies all of a gap between the two magnets, and
• wherein the motor is an interior permanent magnet motor.