CN-115244629-B - Insulated wire, coil using the insulated wire, thickness-varying insulating tape used in manufacturing the insulated wire, and manufacturing method thereof

CN115244629BCN 115244629 BCN115244629 BCN 115244629BCN-115244629-B

Abstract

Provided are an insulated wire, a coil using the insulated wire, a thickness-varying insulating tape used in the manufacture of the insulated wire, and a method for manufacturing the insulated wire, wherein the insulated wire can raise partial discharge starting voltage and prevent deterioration of an insulator, and can realize no deterioration of the full rate of the groove. The above-mentioned problem is solved by an insulated wire (10) for a coil comprising a conductor (1) and insulating covers (2, 3) provided on the outer periphery of the conductor (1), wherein the insulated wire comprises a thicker insulating cover (3) for a part where partial discharge is likely to occur when the voltage becomes high and a thinner insulating cover (2) for a part where partial discharge is unlikely to occur when the voltage does not become high when the coil is wound, and the thicker insulating cover (3) and the thinner insulating cover (2) are repeatedly provided at arbitrary intervals. The coil (40) is obtained by winding an insulated wire (10) in such a manner that the insulating coating (3) of the insulated wire (10) at a portion where partial discharge is likely to occur is thicker and the insulating coating (2) of the insulated wire (10) at a portion where partial discharge is unlikely to occur is thinner.

Inventors

SHAN KOUZHENG
LIN ZHONGXIONG

Assignees

东京特殊电线株式会社

Dates

Publication Date: 20260512
Application Date: 20201224
Priority Date: 20200303

Claims (13)

1. An insulated wire having a conductor and an insulating coating provided on the outer periphery of the conductor, characterized in that, A thicker insulating cover and a thinner insulating cover are repeatedly provided at arbitrary intervals, the thicker insulating cover and the thinner insulating cover being formed by winding a thickness-varying insulating tape having thicker regions and thinner regions at predetermined intervals around the outer circumference of the conductor, The thickness-varying insulating tape is composed of a base tape and an adhesive tape bonded to one main surface of the base tape, or is composed of a base tape, an adhesive tape bonded to one main surface of the base tape, and a cover tape further bonded to the adhesive tape in a form of covering the adhesive tape, The thickness-varying insulating tape further has an adhesive layer formed on one main surface of the base tape and the adhesive tape or the other main surface of the base tape, The thickness-varying insulating tape that is first wound around the outer periphery of the conductor is wound so that the adhesive layer is on the inner side, that is, on the conductor side or on the outer side, and the other thickness-varying insulating tape that is provided on the thickness-varying insulating tape is wound so that the adhesive tape surface side is on the inner side and the adhesive layer is on the inner side.
2. The insulated wire of claim 1, wherein, The thickness-varying insulating tape is wound around the outer periphery of the conductor, and another thickness-varying insulating tape or a thickness-constant insulating tape is wound around the outer periphery of the thickness-varying insulating tape in an overlapping manner, and the thicker insulating coating and the thinner insulating coating are repeated.
3. The insulated wire of claim 2, wherein, In the case of further winding another thickness-varying insulating tape on the basis of the thickness-varying insulating tape, the thicker region of the other thickness-varying insulating tape is overlapped and wound on the already-formed thicker insulating cover in an overlapping manner.
4. The insulated wire of claim 1, wherein, In the case where another thickness variation insulating tape or a thickness constant insulating tape is further overlapped and wound on the basis of the thickness variation insulating tape, the other thickness variation insulating tape and the thickness constant insulating tape are overlapped and wound while changing the winding direction with the thickness variation insulating tape.
5. The insulated wire of claim 1, wherein, The thicker insulating coating has tapered portions at both ends thereof.
6. The insulated wire of claim 4, wherein, The thicker insulating coating and the thinner insulating coating are formed by winding a thickness-varying insulating tape having thicker regions and thinner regions at predetermined intervals around the outer circumference of the conductor, in which thickness-varying insulating tape the boundary between the thicker regions and the thinner regions is formed obliquely with respect to the length direction of the thickness-varying insulating tape.
7. The insulated wire of claim 6, wherein, When the winding angle of the thickness-varying insulating tape with respect to the longitudinal direction of the conductor is represented by θ1, the angle of the boundary between the thicker region and the thinner region with respect to the longitudinal direction of the thickness-varying insulating tape is represented by θ2, and the angle of the boundary of the thickness-varying insulating tape with respect to the longitudinal direction of the conductor is represented by θ3, the winding is performed in a direction in which θ1 is within a range of 10 ° to 60 °, and θ2 is within a range of 10 ° to 90 °, and in which θ2 is greater than θ3.
8. The insulated wire of claim 7, wherein, The theta 3 is 0 deg..
9. An insulated wire having a conductor and an insulating coating provided on the outer periphery of the conductor, characterized in that, A thicker insulating cover and a thinner insulating cover are repeatedly provided at arbitrary intervals, the thicker insulating cover and the thinner insulating cover being formed by winding a thickness-varying insulating tape having thicker regions and thinner regions at predetermined intervals around the outer circumference of the conductor, The thickness-varying insulating tape is wound around the outer periphery of the conductor, and other thickness-varying insulating tape or thickness-constant insulating tape is wound around the outer periphery of the thickness-varying insulating tape in an overlapping manner, and the thicker insulating coating and the thinner insulating coating are repeated, In the case of further winding another thickness-varying insulating tape on the basis of the thickness-varying insulating tape, the thicker region of the other thickness-varying insulating tape is overlapped and wound on the already-formed thicker insulating cover in an overlapping manner.
10. An insulated wire having a conductor and an insulating coating provided on the outer periphery of the conductor, characterized in that, A thicker insulating cover and a thinner insulating cover are repeatedly provided at arbitrary intervals, the thicker insulating cover and the thinner insulating cover being formed by winding a thickness-varying insulating tape having thicker regions and thinner regions at predetermined intervals around the outer circumference of the conductor, The thickness-varying insulating tape is composed of a base tape and an adhesive tape bonded to one main surface of the base tape, or is composed of a base tape, an adhesive tape bonded to one main surface of the base tape, and a cover tape further bonded to the adhesive tape in a form of covering the adhesive tape, In the case where another thickness variation insulating tape or a thickness constant insulating tape is further overlapped and wound on the basis of the thickness variation insulating tape, the other thickness variation insulating tape and the thickness constant insulating tape are overlapped and wound while changing the winding direction with the thickness variation insulating tape, The thicker insulating coating and the thinner insulating coating are formed by winding a thickness-varying insulating tape having thicker regions and thinner regions at predetermined intervals around the outer circumference of the conductor, in which thickness-varying insulating tape the boundary between the thicker regions and the thinner regions is formed obliquely with respect to the length direction of the thickness-varying insulating tape.
11. The insulated wire of claim 10, wherein, When the winding angle of the thickness-varying insulating tape with respect to the longitudinal direction of the conductor is represented by θ1, the angle of the boundary between the thicker region and the thinner region with respect to the longitudinal direction of the thickness-varying insulating tape is represented by θ2, and the angle of the boundary of the thickness-varying insulating tape with respect to the longitudinal direction of the conductor is represented by θ3, the winding is performed in a direction in which θ1 is within a range of 10 ° to 60 °, and θ2 is within a range of 10 ° to 90 °, and in which θ2 is greater than θ3.
12. The insulated wire of claim 11, wherein, The theta 3 is 0 deg..
13. A coil obtained by winding the insulated wire according to any one of claims 1 to 12, characterized in that, The insulated wire includes a portion provided with a thicker insulating coating and a portion provided with a thinner insulating coating, the thicker insulating coating and the thinner insulating coating being repeatedly provided at arbitrary intervals.

Description

Insulated wire, coil using the insulated wire, thickness-varying insulating tape used in manufacturing the insulated wire, and manufacturing method thereof Technical Field The present invention relates to an insulated wire in which the thickness of an insulating coating can be arbitrarily changed in order to raise the partial discharge (corona discharge) start voltage, a coil using the insulated wire, a thickness-variable insulating tape used for manufacturing the insulated wire, and a method for manufacturing the same. Background Insulated wires are used in a variety of products. In the case where an insulated wire is used as a winding for a coil of a rotary electric device such as a motor, the insulated wire is used in a state where a high voltage is applied. At this time, severe partial discharge (corona discharge) may occur on the surface covered with the insulation. Such partial discharge is a phenomenon that occurs due to the accelerated deterioration of the insulating coating caused by the local temperature rise or the ozone and ions. The occurrence of partial discharge may cause a problem of shortening the life of the device using the components. In recent years, in the course of increasing demand for small and high-power motors, a coil capable of increasing the applied voltage has been demanded. However, if the applied voltage is increased, the voltage applied to the coil increases, and partial discharge is likely to occur. To solve such a problem, it is desired to increase the voltage at which partial discharge occurs (referred to as partial discharge start voltage.) and to increase the partial discharge start voltage, the insulation coating of the enamel wire is thickened, the insulation coating by resin extrusion is thickened, and the dielectric constant of the insulation coating by foaming is lowered. However, in either method, the slot fill ratio of the coil winding is reduced, or the film strength is reduced, and there is a limit in increasing the partial discharge start voltage. Partial discharge is likely to occur due to the application of a high voltage to the "lap joint" of the connecting stator slot conductor portion (slot conductor portion refers to a form in which an electric wire is arranged in a slot) of the motor. In order to solve such a problem, patent documents 1 and 2 describe, for example, that partial discharge and the like are suppressed by changing the thickness and the material of an insulating material in a slot conductor portion and a lap joint portion of an insulated wire. Specifically, patent document 1 describes a method in which a conductor is wound in a coil shape and then molded, and then insulating layers are formed in each portion to be a slot conductor portion and a lap joint portion, and the thickness of each insulating layer is changed. Patent document 2 describes a method in which the relative permittivity of a portion of an insulated wire which becomes a lap joint portion in the longitudinal direction is made lower than the relative permittivity of a portion of an insulated wire which becomes a slot conductor portion in the longitudinal direction by adjusting the total volume of air bubbles or the like of a resin forming an insulating layer. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2008-236924 Patent document 2 Japanese patent application laid-open No. 2015-138678 Disclosure of Invention Problems to be solved by the invention However, in order to manufacture an insulated wire having an insulating layer capable of exhibiting an insulating property required for coil design, a large number of man-hours and complicated steps are required in the above-described method for manufacturing an insulated wire. In addition, it is difficult to manufacture an insulated wire having an insulating coating with a thickness that is changed so as to be able to exhibit the insulating performance required for coil design, by an enameling baking method or by a resin extrusion method. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an insulated wire which can be manufactured without a large number of man-hours and complicated steps, can increase a partial discharge start voltage, can prevent deterioration of an insulator, and can realize no deterioration of a full tank ratio, a coil using the insulated wire, a thickness-varying insulated tape used for manufacturing the insulated wire, and a manufacturing method thereof. Solution for solving the problem (1) The insulated wire of the present invention is an insulated wire having a conductor and an insulating coating provided on an outer periphery of the conductor, wherein the insulated wire includes a thicker insulating coating and a thinner insulating coating, and the thicker insulating coating and the thinner insulating coating are repeatedly provided at an arbitrary interval. According to the pre