Motor, compressor, and air conditioner

A motor comprising:

• a stator core having an annular shape about an axis;
• a coil wound on the stator core;
• a rotor core disposed on an inner side of the stator core in a radial direction about the axis, the rotor core having a stacked body in which a plurality of steel laminations are stacked in a direction of the axis and a magnet insertion hole formed in the stacked body, the rotor core having a length in the direction of the axis longer than that of the stator core;
• and
• a magnet inserted in the magnet insertion hole,
• wherein the rotor core has a first region where the magnet is inserted in the magnet insertion hole and a second region where the magnet is not inserted in the magnet insertion hole, in the direction of the axis, and
• wherein each of the steel laminations in the first region has one or more holes on an inner side of the magnet insertion hole in the radial direction, and
• wherein the at least one steel lamination in the second region has no hole or has one or more holes, a number or area of which is smaller than that of the one or more openings of each of the steel laminations in the first region, on the inner side of the magnet insertion hole in the radial direction.