Coil, stator, and motor
Provided are a coil, a stator, and a motor that can suppress generation of eddy current in the coil and reduce Joule loss. A coil is formed by connecting a plurality of one-turn regions each including a turn of a conductor to have a helical structure. The conductor is formed by connecting a first member to a second member in a longitudinal direction, and the plurality of one-turn regions include at least in a part thereof the first member.
1 . A coil comprising:
a plurality of one-turn regions stacked in a direction of a helical axis, wherein the coil is attached to a stator of a motor, and out of the plurality of one-turn regions, at least a part of a one-turn region near a rotor is constituted of a first member, and at least a part of a one-turn region far from the rotor is constituted of a second member, wherein:
each of the one-turn regions is divided into a first half-turn region and a second half-turn region along a virtual cutting plane including a rotation shaft central line of the rotor; and
in at least one one-turn region in the part of a one-turn region near a rotor, at least a part of the first half-turn region is constituted of the first member, and at least a part of the second half-turn region is constituted by the second member.
2 . The coil of claim 1 , wherein the part of a one-turn region far from the rotor is constituted of the second member.
3 . The coil of claim 1 , wherein the one-turn regions are each constituted by one turn of the conductor.
4 . The coil of claim 1 , wherein at least a part of the one-turn region of the part of a one-turn region near a rotor is constituted of the first member.
5 . The coil of claim 1 , wherein:
the first half-turn region is a region on an upstream side in a rotation direction of the rotor; and
the second half-turn region is a region on a downstream side in the rotation direction of the rotor.
6 . The coil of claim 1 , wherein the first member is a conductor having a higher resistance than that of the second member.
7 . The coil of claim 1 , wherein:
the first member is a metal composed primarily of aluminum; and
the second member is a metal composed primarily of copper.
8 . A stator to which the coil of claim 1 is attached.
9 . A motor comprising the coil of claim 1 .