Insulated wire, coil using insulated wire, variable-thickness insulating tape used in manufacture of insulated wire, and manufacturing method of same
To provide an insulated wire that can increase in a partial discharge starting voltage, prevent deterioration of an insulator, and not cause worsening of an occupancy ratio, a coil that uses the insulated wire, a variable-thickness insulating tape used in manufacture of the insulated wire, and a manufacturing method of the same. The above-described problem is solved by an insulated wire ( 10 ) for a coil, comprising a conductor ( 1 ), and insulating coatings ( 2, 3 ) provided on an outer periphery of the conductor ( 1 ). The insulated wire ( 10 ) is constituted by the thick insulating coating ( 3 ) for an area where voltage increases and partial discharge readily occurs, and the thin insulating coating ( 2 ) for an area where the voltage does not increase and partial discharge does not readily occur, when the coil is wound. The thick insulating coating ( 3 ) and the thin insulating coating ( 2 ) are repeatedly provided at desired intervals. The above-described problem is solved by a coil ( 40 ) obtained by winding such an insulated wire ( 10 ) and configured so that the insulating coating ( 3 ) of the insulated wire ( 10 ) in an area where partial discharge readily occurs is thick, and the insulating coating ( 2 ) of the insulated wire ( 10 ) in an area where partial discharge does not readily occur is thin.
1 . An insulated wire comprising:
a conductor; and
an insulating coating provided on an outer periphery of the conductor, the insulating coating comprising a thick insulating coating and a thin insulating coating being repeatedly provided at desired intervals, and
the thick insulating coating and the thin insulating coating are formed by a variable-thickness insulating tape comprising a thick region and a thin region at predetermined intervals being wound on the outer periphery of the conductor;
wherein the variable-thickness insulating tape further comprises:
at least one of a base material tape and a bonding tape bonded onto one main surface of the base material tape, or the base material tape and the bonding tape bonded onto the one main surface of the base material tape, and a cover tape further bonded onto the bonding tape so as to cover the bonding tape;
an adhesive layer formed on the one main surface of the base material tape and on the bonding tape or on the other main surface of the base material tape,
wherein the variable-thickness insulating tape initially wound on the outer periphery of the conductor is wound with the adhesive layer being on the conductor side serving as an inside or on an outside; and
a second variable-thickness insulating tape further provided on the variable-thickness insulating tape is wound with a second bonding tape surface side being on the inside and a second adhesive layer being on the inside.
2 . The insulated wire according to claim 1 , wherein
the variable-thickness insulating tape is wound on the outer periphery of the conductor, another variable-thickness insulating tape or a constant-thickness insulating tape is further wound in a layer on an outer periphery of the second variable-thickness insulating tape, and the thick insulating coating and the thin insulating coating are repeated.
3 . The insulated wire according to claim 1 , wherein,
in a case in which the variable-thickness insulating tape is wound and then the second variable-thickness insulating tape or a constant-thickness insulating tape is further wound in a layer on the variable-thickness insulating tape, the second variable-thickness insulating tape or the constant-thickness insulating tape is wound in a layer in a winding direction different from that of the variable-thickness insulating tape.
4 . The insulated wire according to claim 1 , wherein
the thick insulating coating has a tapered part at both end parts thereof.
5 . An insulated wire comprising:
a conductor; and
an insulating coating provided on an outer periphery of the conductor, the insulating coating comprising a thick insulating coating and a thin insulating coating being repeatedly provided at desired intervals, and
the thick insulating coating and the thin insulating coating are formed by a variable-thickness insulating tape comprising a thick region and a thin region at predetermined intervals being wound on the outer periphery of the conductor,
wherein the variable-thickness insulating tape is wound on the outer periphery of the conductor, a second variable-thickness insulating tape or a constant-thickness insulating tape is further wound in a layer on an outer periphery of the variable-thickness insulating tape, and the thick insulating coating and the thin insulating coating are repeated,
wherein, in a case in which the variable-thickness insulating tape is wound and then the second variable-thickness insulating tape is further wound on the variable-thickness insulating tape, the second variable-thickness insulating tape is wound in a layer so that a thick region thereof overlaps the thick insulating coating already formed.
6 . An insulated wire comprising:
a conductor; and
an insulating coating provided on an outer periphery of the conductor, the insulating coating comprising a thick insulating coating and a thin insulating coating being repeatedly provided at desired intervals, and
the thick insulating coating and the thin insulating coating are formed by a variable-thickness insulating tape comprising a thick region and a thin region at predetermined intervals being wound on the outer periphery of the conductor,
wherein the variable-thickness insulating tape further comprises at least one of a base material tape and a bonding tape bonded onto one main surface of the base material tape, or a base material tape, a bonding tape bonded onto one main surface of the base material tape, and a cover tape further bonded onto the bonding tape so as to cover the bonding tape,
wherein, in a case in which the variable-thickness insulating tape is wound and then a second variable-thickness insulating tape or a constant-thickness insulating tape is further wound in a layer on the variable-thickness insulating tape, the second variable-thickness insulating tape or the constant-thickness insulating tape is wound in a layer in a winding direction different from that of the variable-thickness insulating tape
wherein the thick insulating coating and the thin insulating coating are formed by the variable-thickness insulating tape, including the thick region and the thin region at a predetermined interval, being wound on the outer periphery of the conductor, and
wherein the variable-thickness insulating tape has a boundary line between the thick region and the thin region obliquely formed with respect to a longitudinal direction of the variable-thickness insulating tape.
7 . The insulated wire according to claim 6 , wherein,
given θ 1 as a winding angle of the variable-thickness insulating tape with respect to the longitudinal direction of the conductor, θ 2 as an angle of the boundary line between the thick region and the thin region with respect to the longitudinal direction of the variable-thickness insulating tape, and θ 3 as an angle between the boundary line of the variable-thickness insulating tape and the longitudinal direction of the conductor, the θ 1 is within a range from 10° to 60°, the θ 2 is within a range from 10° to 90°, and the variable-thickness insulating tape is wound in a direction in which the θ 2 is greater than the θ 3 .
8 . The insulated wire according to claim 7 , wherein the θ 3 is 0°.