Motor, blower, and compressor
A motor including a rotor, and a stator having a plurality of coils wound around slots, wherein at least any one of the coils includes a single aluminum wire, a single copper wire joined to the aluminum wire, a stranded wire (lead wire) joined to the copper wire, a cold-pressure-welded joint portion (joint portion) joined between the aluminum wire and the copper wire by cold pressure welding, and a non-pressure welded joint portion (joint portion) provided between the copper wire and the stranded wire (lead wire). A burr covered by an insulation member (insulation tube) is provided in the cold-pressure-welded joint portion (joint portion). A thickness of the insulation member (insulation tube) is larger than a height of the burr.
1. A motor comprising:
a rotor; and
a stator having a plurality of coils wound around slots in the stator, wherein at least any one of the coils includes:
a single aluminum wire;
a single copper wire joined to the aluminum wire;
a stranded wire joined to the copper wire;
a cold-pressure-welded joint portion joining between the aluminum wire and the copper wire by cold pressure welding; and
a non-pressure welded joint portion provided between the copper wire and the stranded wire, and
a burr covered by an insulation member is provided in the cold-pressure-welded joint portion, wherein a thickness of the insulation member is larger than a height of the burr.
2. The motor according to claim 1 , wherein
the copper wire includes a chuck portion that abuts on the cold-pressure-welded joint portion and that has low mechanical strength, and
a length from an end face of a stator core included in the stator to the chuck portion inside the copper wire is shorter than a length of the insulation member, the insulation member being cylindrical.
3. The motor according to claim 1 , wherein the insulation member is transparent.
4. The motor according to claim 3 , wherein the coil includes a plurality of the cold-pressure-welded joint portions and at least any one position of the insulation member covering the cold-pressure-welded joint portions is marked.
5. The motor according to claim 1 , wherein a binding yarn fixing a drawn wire drawn out from the coil fixes the drawn wire such that the cold-pressure-welded joint portion does not receive stress.
6. The motor according to claim 5 , wherein
the aluminum wire and the copper wire are disposed within a coil end of the stator, and
the stranded wire is fixed by the binding yarn.
7. The motor according to claim 1 , wherein in-phase coils are connected in series in the aluminum wire.
8. A single-phase induction motor in which the motor according to claim 1 includes a primary coil and a secondary coil, wherein the secondary coil includes the aluminum wire.
9. The motor according to claim 1 , wherein the coil and the cold-pressure-welded joint portion are coated with varnish.
10. The motor according to claim 1 , wherein the insulation member is formed of a resin material.
11. The motor according to claim 1 , wherein the cold-pressure-welded joint portion and the stator are covered by mold resin.
12. A blower comprising the motor according to claim 1 .
13. A compressor comprising the motor according to claim 1 .
14. A motor comprising:
a rotor; and
a stator having a plurality of coils wound around slots in the stator, wherein
at least any one of the coils includes:
a single aluminum wire;
a single copper wire joined to the aluminum wire via a joint portion; and
a stranded wire joined to the copper wire, wherein
each of the aluminum wire and the copper wire includes a low-strength portion that abuts on the joint portion and that has mechanical strength lower than that of the other portions of the copper wire or the aluminum wire,
a burr covered by an insulation member is provided in the joint portion, and
a thickness of the insulation member is larger than a height of the burr.
15. The motor according to claim 14 , wherein the low-strength portion is covered by the insulation member.
16. A blower comprising the motor according to claim 14 .
17. A compressor comprising the motor according to claim 14 .