Electric motor, compressor, fan, and refrigerating and air conditioning apparatus
AssigneeMitsubishi Electric Corporation
InventorKoji YABE
Life of this patent
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Abstract
An electric motor includes a rotor including a first rotor end and a second rotor end, and a stator including a first stator end and a second stator end. The first rotor end is located apart from the first stator end toward the first side. The second rotor end is located apart from the second stator end toward the first side. The relationship between the distances D1 and D2 satisfies D1>D2≥0, where D1 is a distance from a permanent magnet to a first end plate, and D2 is a distance from the permanent magnet to a second end plate. The thickness of each of a plurality of electrical steel sheets is not less than 0.1 mm and not more than 0.25 mm.
Claims16
An electric motor comprising:
- a stator including a first stator end located on a first side in an axial direction, a second stator end located on a second side opposite to the first side in the axial direction, a tooth extending in a radial direction, and a winding wound around the tooth;
- and
- a rotor including a rotor core including a plurality of electrical steel sheets laminated in the axial direction, a magnet insertion hole, a first rotor end located on the first side, and a second rotor end located on the second side, a permanent magnet inserted in the magnet insertion hole, a shaft fixed to the rotor core and supported only on the second side, a first end plate covering the first side of the magnet insertion hole, and a second end plate covering the second side of the magnet insertion hole,
- wherein the first rotor end is located apart from the first stator end toward the first side in the axial direction,
- the second rotor end is located apart from the second stator end toward the first side in the axial direction,
- a relationship between a distance D1 and a distance D2 satisfies D1>D2≥0, where D1 is a distance from the permanent magnet to the first end plate, and D2 is a distance from the permanent magnet to the second end plate, and
- a thickness of each of the plurality of electrical steel sheets is not less than 0.1 mm and not more than 0.25 mm.
Dependencies are inferred from the claim text.