Patent ID: 11929648
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 11:
12. An electric motor comprising:
a stator including a first stator core, a second stator core, and a slot in which a stator winding is disposed, the first stator core and the second stator core being laminated in an axial direction; and
a rotor including a first rotor core facing the first stator core in a radial direction, a second rotor core facing the second stator core in the radial direction, and a permanent magnet, the rotor being disposed inside the stator, wherein
the stator includes a depression formed in a side wall of the first stator core in a position facing the slot, the depression not touching the stator winding,
the first rotor core includes at least one first hole having a first magnet insertion part in which the permanent magnet is inserted and a first flux barrier part communicating with the first magnet insertion part,
the second rotor core includes at least one second hole having a second magnet insertion part in which the permanent magnet is inserted and a second flux barrier part communicating with the second magnet insertion part,
in a plane orthogonal to the axial direction, the first rotor core includes a projection facing the permanent magnet in a longitudinal direction of the permanent magnet,
in the plane, an area of the first flux barrier part is smaller than an area of the second flux barrier part, and
a volume of the first rotor core is larger than a volume of the second rotor core.