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US 11,394,258 B2Granted
Electric motor, compressor, fan, and refrigerating and air conditioning apparatus
AssigneeMitsubishi Electric Corporation
InventorKoji Yabe
Life of this patent
Estimating the term…
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.
Claims17
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,
- wherein the rotor core includes a first portion located at an end of the rotor core in a radial direction and in a magnetic pole center portion of the rotor, and a second portion located at an end of the rotor core in a radial direction and in an inter-pole portion of the rotor, and
- in a plane perpendicular to the axial direction, a distance from a center of rotation of the rotor to the first portion is larger than a distance from the center of rotation of the rotor to the second portion, wherein
- the first end plate includes a first outer edge forming a part of an outer edge of the first end plate, and a second outer edge adjacent to the first outer edge in a circumferential direction,
- the first outer edge is located apart from the first portion inward in a radial direction, and
- the second outer edge is located apart from the second portion outward in a radial direction.
9 more elements
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, wherein
- the first end plate includes a first fixing hole,
- the rotor core includes a second fixing hole,
- the rotor includes a fixing member to fix the first end plate to the rotor core,
- the fixing member is inserted in the first fixing hole and the second fixing hole, and
- the electric motor satisfies (r2+r3)−2×r1≤M1−T1
- where r1 is a radius of the fixing member, r2 is a radius of the first fixing hole, r3 is a radius of the second fixing hole, M1 is a radius of the rotor core in a magnetic pole center portion of the rotor, and T1 is a radius of the first end plate on the magnetic pole center portion.
10 more elements
Dependencies are inferred from the claim text.