Stator and electric motor using same
A stator according to the present invention includes: a cylindrical stator core; a plurality of tooth portions provided along a circumferential direction of the stator core; and windings disposed in a plurality of slots provided between the tooth portions and wound around the tooth portions. The windings are configured by materials having different electrical resistivities. A ratio of a sectional area of a material having a high electrical resistivity to a sectional area of a material having a low electrical resistivity in the slot is equal to or larger than 1 and equal to or smaller than a ratio of the electrical resistivity of the material having the high electrical resistivity to the electrical resistivity of the material having the low electrical resistivity.
1. A stator comprising:
a cylindrical stator core;
a plurality of tooth portions formed along a circumferential direction of the stator core, and
windings disposed in a plurality of slots formed between the tooth portions and wound around the tooth portions,
characterized in that:
the windings are configured by materials having different electrical resistivities, and
a ratio of a sectional area of a material having a high electrical resistivity to a sectional area of a material having a low electrical resistivity in the slot is equal to a square root of a ratio of the electrical resistivity of the material having the high electrical resistivity to the electrical resistivity of the material having the low electrical resistivity.
2. A stator comprising:
a cylindrical stator core;
a plurality of tooth portions formed along a circumferential direction of the stator core, and
windings disposed in a plurality of slots formed between the tooth portions and wound around the tooth portions,
characterized in that:
the windings are configured by materials having different electrical resistivities, and a material having a low electrical resistivity is copper and a material having a high electrical resistivity is aluminum, and
a ratio of a sectional area of the windings using aluminum as the material to a sectional area of the windings using copper as the material is within a range in which the ratio can be considered equivalent to a square root of the ratio of the electrical resistivity of aluminum to the electrical resistivity of copper.
3. An electric motor comprising:
a cylindrical stator core;
a plurality of tooth portions formed along a circumferential direction of the stator core,
windings disposed in a plurality of slots formed between the tooth portions and wound around the tooth portions,
a rotor that rotates based on a magnetic field generated by the windings, and
a shaft fixed to the rotor and transmitting a rotational force of the rotor to an external member,
characterized in that:
the windings are configured by materials having different electrical resistivities, and
a ratio of a sectional area of a material having a high electrical resistivity to a sectional area of a material having a low electrical resistivity in the slot is equal to a square root of a ratio of the electrical resistivity of the material having the high electrical resistivity to the electrical resistivity of the material having the low electrical resistivity.
4. An electric motor comprising:
a cylindrical stator core;
a plurality of tooth portions formed along a circumferential direction of the stator core,
windings disposed in a plurality of slots formed between the tooth portions and wound around the tooth portions,
a rotor that rotates based on a magnetic field generated by the windings, and
a shaft fixed to the rotor and transmitting a rotational force of the rotor to an external member,
characterized in that:
the windings are configured by materials having different electrical resistivities, and a material having a low electrical resistivity is copper and a material having a high electrical resistivity is aluminum, and
a ratio of a sectional area of the windings using aluminum as the material to a sectional area of the windings using copper as the material is within a range in which the ratio can be considered equivalent to a square root of the ratio of the electrical resistivity of aluminum to the electrical resistivity of copper.