Conductor and rotating electrical machine with a covering material

1. A core for a rotating electrical machine, the core being configured with a plurality of semi-open slots in which a width of a slot opening that opens in the radial direction of the core is narrower than a width of a portion of the semi-open slots located deeper than the slot opening of the semi-open slots, the core further comprising:

a conductor wire bundle formed by gathering a plurality of bare conductor wires without adhesive material between the bare conductor wires; and

a flexible insulating covering material that covers a periphery of the conductor wire bundle, wherein

the conductor has an intra-covering gap formed inward of the insulating covering material in a radial direction so that the conductor wires can move relative to each other in the intra-covering gap, and a cross-sectional shape of the insulating covering material along a perpendicular plane that is perpendicular to an extending direction in which the conductor wire bundle extends can be deformed, wherein:

the conductor is wound on the core,

the insulating covering material is configured to be deformed by pressing the insulating covering material in the radial direction of the insulating covering material, whereby the intra-covering gap is eliminated and the conductor wires are packed as a whole into a packed state by moving the conductor wires relative to each other in the intra-covering gap in accordance with the deformation of the insulating covering material, and

a width of the insulating covering material in the packed state is equal to or less than the slot opening width.

2. The core according to claim 1 , wherein

in a cross section along the perpendicular plane, a smallest diameter of an imaginary circumscribed circle circumscribing the conductor wire bundle in which adjoining ones of the conductor wires are in contact with each other is smaller than a true circle inner diameter that is an inner diameter of the insulating covering material deformed to a true circle.

3. The core according to claim 2 , wherein

a difference between the smallest diameter of the imaginary circumscribed circle and the true circle inner diameter of the insulating covering material is equal to or larger than a diameter of the conductor wires.

4. The core according to claim 3 , wherein

a perimeter of an inner surface of the insulating covering material is equal to or less than a perimeter of an elongated circle circumscribing the conductor wire bundle having all the conductor wires being arranged in line and in contact with each other.

5. The core according to claim 4 , wherein

the width in the radial direction of the insulating covering material in the packed state matches the slot opening width.

6. The core according to claim 5 , wherein

the conductor wire bundle and the insulating covering material are in a non-bonded state.

7. The core according to claim 2 , wherein

a perimeter of an inner surface of the insulating covering material is equal to or less than a perimeter of an elongated circle circumscribing the conductor wire bundle having all the conductor wires being arranged in line and in contact with each other.

8. The core according to claim 1 , wherein

a perimeter of an inner surface of the insulating covering material is equal to or less than a perimeter of an elongated circle circumscribing the conductor wire bundle having all the conductor wires being arranged in line and in contact with each other.

9. The core according to claim 1 , wherein

the conductor wire bundle and the insulating covering material are in a non-bonded state.

10. A rotating electrical machine, comprising a core according to claim 1 .

11. A rotor core according to the core of claim 1 , wherein the semi-open slots open radially outward.

12. A stator core according to the core claim 1 , wherein the semi-open slots open radially outward.

13. A stator core according to the core claim 1 , wherein the semi-open slots open radially inward.