Permanent magnet embedded electric motor, compressor, and refrigerating and air-conditioning device
An interior permanent magnet motor includes a stator and a rotor. The rotor includes a rotor core formed by laminating a plurality of plate members. The rotor core has a plurality of magnet insertion holes formed therein, into which corresponding permanent magnets are respectively inserted. At least one slit and at least one caulked portion are formed between a rotor outer peripheral surface of the rotor and a radially-outer insertion hole contour surface of the magnet insertion hole. At least a part of the caulked portion is positioned between a pair of width extended lines of the slit.
1. An interior permanent magnet motor, comprising:
a stator; and
a rotor rotatably arranged so as to be opposed to the stator,
wherein the rotor comprises a rotor core formed by laminating a plurality of plate members,
wherein the rotor core has a plurality of magnet insertion holes formed therein, into which corresponding permanent magnets are respectively inserted,
wherein at least one slit and at least one caulked portion are formed between a rotor outer peripheral surface of the rotor and a radially-outer insertion hole contour surface of the magnet insertion hole, and
wherein at least a part of the caulked portion is positioned between a pair of width extended lines of the slit.
2. An interior permanent magnet motor according to claim 1 , wherein the plurality of magnet insertion holes are each formed into a shape that is convex toward a center side of the rotor.
3. An interior permanent magnet motor according to claim 1 , wherein the entire caulked portion is positioned between the pair of width extended lines of the slit.
4. An interior permanent magnet motor according to claims 1 ,
wherein a plurality of the slits are formed between the rotor outer peripheral surface of the rotor and the radially-outer insertion hole contour surface of the magnet insertion hole, and
wherein the plurality of the slits are arrayed in a width direction.
5. An interior permanent magnet motor according to claims 1 , wherein the caulked portion is formed on a radially inner side with respect to the corresponding slit.
6. A compressor, comprising, in an airtight container:
a motor; and
a compression element,
wherein the motor comprises the interior permanent magnet motor of claim 1 .
7. A refrigeration and air conditioning apparatus, comprising the compressor of claim 6 as a component of a refrigeration cycle.