Patent ID: 11967863
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A rotating electric machine, comprising:
a stator; and
a rotor provided inside the stator in a radial direction of the stator;
wherein the rotor includes:
a rotor core having formed therein a magnet insertion hole group formed of a plurality of magnet insertion holes;
a permanent magnet group formed of a plurality of permanent magnets which are inserted into the magnet insertion hole group; and
a magnetic slit group including a plurality of magnetic slits,

wherein the plurality of magnet insertion holes forming the magnet insertion hole group are arranged side by side so that a shape of the magnet insertion hole group becomes a convex shape in which an intermediate portion protrudes from both end portions inwardly in a radial direction of the rotor core,
wherein the plurality of permanent magnets forming the permanent magnet group form one magnetic pole in the rotor,
wherein the rotor core has a first magnetic slit and a second magnetic slit formed in a portion of the rotor core surrounded by a radially-outer side surface of the rotor core and the magnet insertion hole group, the first magnetic slit being one of the plurality of magnetic slits included in the magnetic slit group and having an arc shape in which an intermediate portion protrudes from both end portions inwardly in the radial direction of the rotor core, the second magnetic slit being one of the plurality of magnetic slits included in the magnetic slit group, being provided closer to the magnet insertion hole group than the first magnetic slit, is provided, and having an arc shape in which an intermediate portion protrudes from both end portions inwardly in the radial direction of the rotor core;
wherein a portion of the rotor core between the first magnetic slit and the second magnetic slit is set as a first q-axis magnetic path, and a portion of the rotor core between the second magnetic slit and the magnet insertion hole group is set as a second q-axis magnetic path,
wherein the second magnetic slit has arranged therein a first magnet magnetic flux guide path connecting the first q-axis magnetic path and the second q-axis magnetic path to each other, the first q-axis magnetic path being arranged along the radial direction of the rotor core so that the second magnetic slit is slit into a plurality of portions and the plurality of portions are space apart from each other,
wherein the first magnetic slit provided on a radially-outer side of the first magnet magnetic flux guide path is a non-magnetic region,
wherein one of two intersecting points at which a curved line passing through a widthwise center of the first q-axis magnetic path and the radially-outer side surface of the rotor core intersect is set as a first intersecting point, and the other of the two intersecting points is set as a second intersecting point, and
wherein the rotating electric machine satisfies the following expression:

θ1=2π×n1÷{P×(2m1−1)} [rad], where:

θ1 represents an angle between a straight line passing through the first intersecting point and a radial center point of the rotor core and a straight line passing through the second intersecting point and the radial center point of the rotor core;
P represents the number of pole pairs;
m1 represents a natural number; and
n1 represents a natural number smaller than m1.