Rotor, electric motor, compressor, and air conditioner
AssigneeMitsubishi Electric Corporation
InventorsTomoki Masuko, Atsushi Matsuoka
Life of this patent
Estimating the term…
Abstract
A rotor includes a rotor core, a first permanent magnet that is W1 mm long in a longitudinal direction, and a second permanent magnet that is W1 mm long in a longitudinal direction. The rotor core includes a first magnet insertion hole, a second magnet insertion hole, and a center lib. The first magnet insertion hole includes a first outside opening part having a radius of curvature of R1 mm, and a first inside opening part having a radius of curvature of R2 mm. The second magnet insertion hole includes a second outside opening part having a radius of curvature of R1 mm, and a second inside opening part having a radius of curvature of R2 mm. The rotor satisfies R1>R2 and 0<(R1+R2)/W1<0.082.
Claims9
A rotor comprising:
- a rotor core including a first magnet insertion hole, a second magnet insertion hole, and a center lib between the first magnet insertion hole and the second magnet insertion hole;
- a first permanent magnet disposed in the first magnet insertion hole, the first permanent magnet being W1 mm long in a longitudinal direction in a plane perpendicular to an axial direction;
- and
- a second permanent magnet disposed in the second magnet insertion hole, the second permanent magnet being W1 mm long in a longitudinal direction in the plane, wherein
- the first magnet insertion hole and the second magnet insertion hole are disposed in a V shape so that a center of one pair of the first magnet insertion hole and the second magnet insertion hole projects toward a center of the rotor core in the plane,
- the first magnet insertion hole includes
- a first magnet disposition part in which the first permanent magnet is disposed,
- a first flux barrier part communicating with the first magnet disposition part,
- a first outside opening part located on an outer side with respect to the first magnet disposition part in a radial direction of the rotor core, the first outside opening part having a radius of curvature of R1 mm in the plane, and
- a first inside opening part located on an inner side with respect to the first magnet disposition part in the radial direction, the first inside opening part having a radius of curvature of R2 mm in the plane, and
- the second magnet insertion hole includes
- a second magnet disposition part in which the second permanent magnet is disposed,
- a second flux barrier part communicating with the second magnet disposition part,
- a second outside opening part located on an outer side with respect to the second magnet disposition part in the radial direction, the second outside opening part having a radius of curvature of R1 mm in the plane, and
- a second inside opening part located on an inner side with respect to the second magnet disposition part in the radial direction, the second inside opening part having a radius of curvature of R2 mm in the plane, and
- the rotor satisfies R1>R2 and 0<(R1+R2)/W1<0.082.
Dependencies are inferred from the claim text.