Motor, compressor, and air conditioning apparatus

A motor comprising:

• a rotor rotatable in a rotating direction about an axis;
• and
• a stator surrounding the rotor from an outer side in a radial direction about the axis,
• the rotor comprising:
• a rotor core having a magnet insertion hole corresponding to one magnetic pole;
• and
• a permanent magnet disposed in the magnet insertion hole,
• wherein the rotor core has a plurality of slits on an outer side of the magnet insertion hole in the radial direction;
• wherein the plurality of slits include a first slit located most upstream in the rotating direction;
• wherein each of the plurality of slits has a tip portion which is an outer end in the radial direction, and a root portion which is an inner end in the radial direction;
• wherein the first slit extends so that the tip portion of the first slit is located upstream of the root portion of the first slit in the rotating direction;
• wherein the tip portion of the first slit is located upstream of a magnetic pole center in the rotating direction;
• wherein the root portions of the plurality of slits are disposed more in number in a second region downstream of the magnetic pole center in the rotating direction than in a first region upstream of the magnetic pole center in the rotating direction;
• and
• wherein a point A positioned at a center of the tip portion of the first slit in the rotating direction, a point B positioned at an upstream end in the rotating direction of an outer end edge of the permanent magnet in the radial direction, and a point C positioned at the magnetic pole center on an outer end edge of the magnet insertion hole in the radial direction form an isosceles triangle having an apex at the point A.

A motor comprising:

• a rotor rotatable in a rotating direction about an axis;
• and
• a stator surrounding the rotor from an outer side in a radial direction about the axis,
• the rotor comprising:
• a rotor core having a magnet insertion hole corresponding to one magnetic pole;
• and
• a permanent magnet disposed in the magnet insertion hole,
• wherein the rotor core has a plurality of slits on an outer side of the magnet insertion hole in the radial direction;
• wherein the plurality of slits include a first slit located most upstream in the rotating direction;
• wherein each of the plurality of slits has a tip portion which is an outer end in the radial direction, and a root portion which is an inner end in the radial direction;
• wherein the first slit extends so that the tip portion of the first slit is located upstream of the root portion of the first slit in the rotating direction;
• wherein the tip portion of the first slit is located upstream of a magnetic pole center in the rotating direction;
• wherein the root portions of the plurality of slits are disposed more in number in a second region downstream of the magnetic pole center in the rotating direction than in a first region upstream of the magnetic pole center in the rotating direction;
• and
• wherein the plurality of slits extend so that the first slit has a largest angle with respect to a straight line in the radial direction passing through the magnetic pole center.