JP2006340458A - Wire rod, coil, stator coil, rotor coil, transformer, and method for manufacturing wire rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an eddy current reducing wire inexpensively manufactured and reducing an eddy current. <P>SOLUTION: The method for manufacturing a wire rod is provided with a first process for forming three grooves 20 on a face 19a of a straight-angle strand 19 using a groove forming apparatus 50 with three cutters 51 on the straight-angle strand 19, a second process for injecting or inserting an insulator into the grooves 20, and a third process for processing the wire rod 20 with the insulator in the grooves 20 into a shape with a predetermined cross section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coil used for a motor or a transformer, a wire used for the coil, a manufacturing method thereof, and the like.

  A coil used for a motor or the like is driven by an alternating current or a pulse current, so that generally it is required that there is little heat generation due to iron loss and a reduction in effective magnetic flux due to eddy current.

In order to reduce this eddy current, a technique for providing a low-loss core member that reduces the eddy current by bundling a plurality of thin wires and subdividing the area where the eddy current is generated is disclosed (for example, patents). Reference 1).
JP-A-9-330810

  However, the low-loss core member of Patent Document 1 is formed by cutting and bundling fine wires into a predetermined length, and then winding the outer periphery with glass fiber and restraining the outer periphery, and the manufacturing process is complicated. It took time and money, and it was expensive.

  An object of the present invention is to provide a wire, a coil, a stator coil, a rotor coil, a transformer, and a method for manufacturing a wire that can reduce eddy currents and can be manufactured at a lower cost in consideration of the above-described conventional problems. And

In order to solve the above problems, the first present invention provides:
It is a wire in which the groove part is formed in the surface along the wire direction.

The second aspect of the present invention is
The said groove part is a wire of 1st this invention currently formed in multiple numbers.

The third aspect of the present invention
The wire according to the first aspect of the present invention, wherein a member different from the wire is inserted into the groove.

The fourth aspect of the present invention is
The different member is the wire according to the third aspect of the present invention, which is an insulating material.

The fifth aspect of the present invention is
The cross-sectional shape in the direction substantially orthogonal to the said wire direction of the said groove part is a wire of 1st this invention which is a wedge shape.

The sixth aspect of the present invention
The cross-sectional shape in the direction substantially orthogonal to the said wire direction of the said groove part is a wire of 1st this invention which is a rectangle.

The seventh aspect of the present invention
The wire is a round wire,
The wedge-shaped or rectangular cross-sectional shape of the groove portion is the wire rod according to the fifth or sixth aspect of the present invention, which is formed toward the axis of the wire rod.

Further, the eighth aspect of the present invention is
The wire is a round wire,
The wedge-shaped or rectangular cross-sectional shape of the groove portion is the wire rod according to the fifth or sixth aspect of the present invention, which is formed in a state deviating from the axis of the wire rod.

The ninth aspect of the present invention provides
The said groove part is a wire of 1st this invention currently formed in the helical shape along the said wire direction.

The tenth aspect of the present invention is
The plurality of groove portions is the wire rod according to the second aspect of the present invention having a crossing portion.

The eleventh aspect of the present invention is
The wire is a flat wire, and the wire according to the first aspect of the present invention changes in thickness and width in the wire direction.

The twelfth aspect of the present invention is
The wire is the wire of the first aspect of the present invention, which is a high-frequency wire.

The thirteenth aspect of the present invention is
A coil obtained by winding the wire of the first aspect of the present invention a plurality of times.

The fourteenth aspect of the present invention is
A coil in which the wire of the eleventh aspect of the present invention is wound a plurality of times, and has a substantially trapezoidal cross-sectional shape.

The fifteenth aspect of the present invention is
A substantially cylindrical stator having a plurality of cores;
A stator coil comprising a plurality of thirteenth or fourteenth coils of the present invention disposed on the core.

The 16th aspect of the present invention is
A rotor having a plurality of cores;
It is a rotor coil provided with the 13th or 14th coil of this invention arrange | positioned at the said core.

The seventeenth aspect of the present invention is
A thirteenth or fourteenth coil of the present invention;
A transformer with a core.

The 18th aspect of the present invention is
A first step of forming a groove in the wire;
A second step of injecting or inserting an insulating material into the groove;
And a third step of processing the wire having the insulating material in the groove into a predetermined cross-sectional shape.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the wire, coil, stator coil, rotor coil, transformer, and wire which reduce an eddy current which can be manufactured more cheaply can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIGS. 1A and 1B are a front view and a cross-sectional view of the electric wire member according to the first embodiment of the present invention.

  FIG. 1 shows a round wire 1 as an electric wire member which is an example of the wire of the present invention, and its central axis is 1a. The round line 1 has four grooves 2 formed on the surface thereof along the central axis 1a. The groove 2 has a wedge-shaped cross section substantially perpendicular to the central axis 1a, and the depth direction is formed toward the central axis 1a. Further, the four grooves are formed such that a line connecting the depth direction of each of the four grooves 2 and the central axis 1a is at an interval of 90 degrees about the central axis 1a.

  As the material of the round wire 1, a conductive material such as copper can be selected. A material different from the material of the round wire 1 may be inserted or injected into the groove 2. As this different material, a material having a different resistance value from the material of the round wire 1 can be selected. For example, when copper is used as the material of the round wire 1, aluminum or the like can be selected as the material inserted or injected into the groove 2. In this way, the skin area can be increased by inserting materials having different resistance values.

  Furthermore, it is possible to select an insulating material as a different material. Thus, by selecting an insulating material, the cross-sectional area of an electric wire member is divided | segmented and it becomes possible to suppress generation | occurrence | production of an eddy current.

  Further, the cross-sectional shape of the groove of the electric wire member shown in FIG. 1 is a wedge shape, but is not limited to this shape, for example, a rectangular shape as shown in the front view of FIG. 2A and the cross-sectional view of FIG. The groove 3 may be used.

  Furthermore, a cross-sectional shape as shown in FIG. 3A shows a front view, and FIG. 3B shows a cross-sectional view. The groove 4 shown in FIG. 3 is not formed in the depth direction toward the central axis 1a, unlike the groove 3 in FIG. As shown in the cross-sectional view of FIG. 3B, when the entrance of the groove 4 is 4a, a predetermined angle θ is formed by the line connecting the entrance 4a and the central axis 1a and the depth direction 4b. . The four grooves have an angle θ in the same direction. An example of a rectangular cross-sectional shape formed in a state deviated from the axis of the present invention corresponds to the groove 4. The groove 4 may have a wedge shape as described above.

  The shape and number of grooves described in the first embodiment are not limited and may be changed as appropriate. For example, the number of grooves shown in FIG. 1 may be eight and may be provided at equal intervals.

(Embodiment 2)
Below, the electric wire member of Embodiment 2 concerning this invention is demonstrated. Unlike the round wire of Embodiment 1, the electric wire member shown in this Embodiment 2 which is an example of this invention is a flat wire, and the fundamental structure is the same.

  FIG. 4A is a front view of the electric wire member according to the second embodiment. FIG. 4B is a cross-sectional view of the electric wire member in the second embodiment as viewed in the direction of the arrow between XX ′. The electric wire member shown in FIG. 4 is a flat wire 5 and has a width 5a and a thickness 5b. Two grooves 6a and 6b are formed in one flat surface 5c having the width 5a of the flat wire 5 so that the depth direction is substantially perpendicular to the flat surface, and the groove 6c is formed in the other flat surface 5d. The depth direction is substantially perpendicular to the plane.

  The grooves 6a, 6b and 6c are formed substantially in parallel with the wire direction of the flat wire 5, and the cross-sectional shape thereof is a wedge shape. The groove 6c is formed substantially at the center of the width 5a, and the grooves 6a and 6b are formed between the groove 6c and both ends of the flat wire 5.

  Aluminum, an insulating material, or the like can be injected or inserted into such a groove portion as described in the first embodiment.

  Next, modified examples in which the groove shape, forming position, and number are changed will be described below. In addition, the following FIGS. 5-11 is sectional drawing which looked at the same direction as FIG.

Figure 5 (a), (b) is, FIG. 4 (a), the relative flat wire 5 described in (b), the thickness is thickened and 5b _1, both end surfaces 5e having the thickness 5b _1, It is the front view and sectional drawing of the electric wire member which further formed grooves 6d and 6e in 5f. The grooves 6d and 6e are formed substantially at the center of the thickness 5b _{1 so} that the depth direction thereof is perpendicular to the end face.

  6 (a) and 6 (b) are front views showing a state in which cuts 7a, 7b and 7c are inserted by a laser instead of the three grooves described in FIGS. 4 (a) and 4 (b). FIG. It should be noted that, instead of laser cutting, wire cutting may be used.

  FIGS. 7A and 7B are a front view and a cross-sectional view of an electric wire member in which two wedge-shaped grooves 8 are formed in a spiral shape along the wire direction of the flat wire 5. (B) is the sectional side view which looked at the arrow direction between WW 'of (a). Further, the depth 8a of the groove 8 is deeper than half the thickness 5b of the flat wire 5, but may be shallow.

  Further, like the electric wire member shown in the front view of FIG. 8A and the cross-sectional view of FIG. 8B, in the electric wire member described in FIGS. 4A and 4B, the groove 6a having a wedge-shaped cross section is provided. , B, and c may be formed with rectangular grooves 10a, b, and c.

  Further, like the wire member shown in the front view of FIG. 9A and the cross-sectional view of FIG. 9B, in the wire member described in FIG. 5A and FIG. , B, c, d, and e may be formed with rectangular grooves 11a, b, c, d, and e.

  Further, like the electric wire member shown in the front view of FIG. 10A and the cross-sectional view of FIG. 10B, in the electric wire member described in FIG. 7A and FIG. Instead of, a rectangular groove 12 may be formed.

  Note that the shape and number of grooves described in the second embodiment are not limited and can be changed as appropriate.

  In the first and second embodiments, a plurality of grooves may intersect each other.

(Embodiment 3)
Below, the manufacturing method of the wire in Embodiment 3 concerning this invention is demonstrated.

  FIG. 16 is a diagram for explaining a manufacturing method of the wire in the third embodiment of the present invention.

  FIG. 16A is a front view of a state in which a groove is formed in the round wire 27 by the die 28. FIG.16 (b) is the figure which looked at the arrow direction of (a). FIG.16 (c) is a figure which shows the internal shape of the die | dye which looked at the arrow direction of (a). The dice 28 forms the groove 2 of the round wire 1 shown in FIG.

  As shown in FIGS. 16A to 16C, the die 28 includes a wire passing portion 29 that is a through hole through which the round strand 60 passes. The wire passing portion 29 includes a wire insertion port 30 having substantially the same shape as the cross-sectional shape of the round strand 60 and a wire outlet 31 smaller than the wire insertion port 30. Further, as shown in FIG. 16C, the groove forming portion 32 for forming the four wedge-shaped grooves 2 described in FIG. 1 is formed.

  By inserting a round strand 60, which is an example of a wire rod of the present invention, into the wire insertion slot 30 of the die 28 and pulling it out in the direction of the arrow, the round strand 60 is pressed while the groove 2 having the shape shown in FIG. 1 is formed. (Corresponds to an example of the first step of the present invention).

  Next, an insulating film is inserted into the groove 2 (corresponding to an example of the second step of the present invention).

  Next, the round wire 60 in which the insulating film is inserted is passed through a die having a diameter slightly smaller than the outer diameter thereof, thereby eliminating a gap between the groove 2 and the insulating film due to pressure from the die (third of the present invention). It corresponds to an example of a process.)

  As described above, the manufacturing method of the wire rod of the present invention only requires forming a groove with a die, inserting an insulating film, and pressing again, and requires a complicated process of bundling or restraining thin wires as in the past. Therefore, the cost can be reduced.

  Further, after the insulating film is inserted into the groove, further processing is performed with a die to eliminate the gap between the groove and the insulating film, thereby increasing the density of the conductor and increasing the unit area of the conductor.

  Although the insulating film is used in the third embodiment, an insulating material or a material having a resistance value different from that of the wire described in the first embodiment may be inserted or injected into the groove 18.

  In the third embodiment, the wire is pressed when the groove is formed. However, the groove may be simply formed without pressing.

  In Embodiment 3, a round wire having a smaller diameter is manufactured from the round wire 60 in which an insulating film is inserted into the groove 2. However, a flat wire may be manufactured by roller pressing. Also in this case, since the gap between the groove and the insulating film is eliminated by the roller press, the density of the conductor increases and the unit area of the conductor increases. The drawing of the wire with the die and the processing with a roller press are existing methods and are not shown.

  The insulating film may be sealed in the wire after the third step.

  In the third embodiment, the method of forming the groove 2 in the round wire 60 has been described. However, the groove may be formed in the flat wire 23 as shown in FIG.

  FIG. 15A is a front view of a state in which a groove is formed in the flat wire 23 by the die 22. FIG.15 (b) is the figure which looked at the arrow direction of (a). FIG.15 (c) is a figure which shows the internal shape of the die | dye which looked at the arrow direction of (a). The rectangular wire 5 having the grooves 6a, 6b, and 6c having the shape shown in FIG.

  As shown in FIGS. 15A to 15C, the die 22 includes a wire passing portion 24 that is a through-hole through which the flat wire 23 passes, and the wire passing portion 24 is formed of the flat wire 23. A wire rod insertion port 25 having substantially the same shape as the cross-sectional shape and a wire rod outlet 26 smaller than the wire rod insertion port 25 are provided. Also, groove forming portions 27 a and 27 b for forming the grooves 6 a and 6 b having a wedge-shaped cross section shown in FIG. 4 are formed downward from the upper surface of the wire passing portion 24. Further, a groove forming portion 27 c for forming the groove 6 c is formed upward from the lower surface of the wire passing portion 24. By moving the flat wire 23 in the direction of the arrow shown in FIG. 15A, the grooves 6a, b, c are formed by the groove forming portions 27a, b, c, and the cross-sectional shape is the size of the wire outlet 26. Accordingly, the rectangular wire 5 shown in FIG. 4 is formed.

  The groove forming portion 32 formed on the inner diameter of the die 28 is formed in parallel with the traveling direction of the round wire 27. The groove forming portion 32 is formed obliquely with respect to the traveling direction, and the groove can be formed in a spiral shape along the wire material direction by pulling the wire material while rotating the wire material in the oblique direction. By processing the round wire formed with the spiral groove into a flat wire, the flat wire with the groove 8 shown in FIG. 7 can be formed.

  Moreover, you may form a groove | channel using a roller or a cutter as shown in FIG.11 and FIG.12.

  FIGS. 11A and 11B are a front view and a side view of a roller used to form a wedge-shaped groove in a flat wire. Grooves are formed by a pair of upper and lower rollers 13 and 14 shown in FIG. Between this roller 13 and the roller 14, the insertion port 15 for inserting a flat wire is formed. The roller 13 is provided with four groove forming portions 16 along the surface of the roller 13. In addition, three groove forming portions 17 are installed along the surface of the roller 14 so as to be positioned between the four groove forming portions (see FIG. 11C, which is an enlarged view of the S portion). ). The groove forming portion 16 and the groove forming portion 17 have the same shape.

  By inserting the wire into the insertion port 15, the groove 18 having the shape shown in FIG. 12 can be formed while the wire is pressed.

  FIGS. 13A and 13B are a front view and a side view of the main part of the groove forming apparatus 50 used for groove formation and the flat rectangular wire 19 to be processed. FIG. 13C is an enlarged view of the T portion in FIG. This flat wire 19 is an example of the wire of the present invention.

  A groove forming device 50 shown in FIG. 13A includes a pair of cylindrical holding members 52 that hold the width of the flat wire 19, three cutters 51 positioned between the holding members 52, and these Four collars 53 for fixing the cutter 51 between the holding members 52 are provided. The widths of the three cutters 51 are supported by the collar 53. The cutter 51 forms a rectangular groove.

  As shown in FIGS. 13A and 13B, the rectangular wire 19 having the cross-sectional shape shown in FIG. 14A is disposed between the holding members 52 of the groove forming device 50. Then, by drawing the flat wire 19 in the direction of the arrow shown in FIG. 13B, a groove 20 corresponding to the cutter 51 is formed on one flat surface 19a as shown in FIG. 14B.

  Next, two grooves 21 are formed on the flat surface 19b by using a groove forming apparatus having two cutters with the flat surface 19b facing the flat surface 19a facing up. The two grooves 21 are formed so as to be positioned between the three grooves 20.

  As the cutter 51, a diamond cutter or the like can be used.

  Further, in the groove forming device 50, as shown in FIG. 13C, a gap L is provided between the flat wire 19 and the collar 53, unlike the roller in FIG. Can be formed.

(Embodiment 4)
The coil according to the fourth embodiment of the present invention will be described below. The coil of the fourth embodiment is formed by winding the electric wire member described in the first embodiment.

  FIGS. 17A and 17B are a side view and a front view of a coil wound around a rectangular wire 33 in which the groove 6c of the rectangular wire 5 shown in FIG. 4 is not formed. FIG. 17C is an enlarged view of the u portion shown in FIG. FIG. 17D is a cross-sectional view of the flat wire 33. As shown in FIG. 17 (d), the rectangular wire 33 has grooves 33a and 33b having a wedge-shaped cross section similar to FIG. A surface on which the grooves 33a and 33b are formed is a surface 33c, and left and right end surfaces are 33d and 33e. The coils shown in FIGS. 17A, 17B, and 17C are formed by winding the flat wire 33 so that the surface 33c faces outward and the end surface 33d faces the end surface 33e. is there. The surface 33c may be inward.

  18 (a) and 18 (b) are a side view and a front view of a coil in which the rectangular wire 5 shown in FIG. 4 is wound. FIG. 18C is an enlarged view of a portion v shown in FIG. FIG. 18D is a cross-sectional view of the flat wire 5. As shown in FIG. 18 (d), when the end faces are 5e and 5f, this coil is formed by winding so that the end face 5f is the outside, the end face 5e is the inside, and the planes 5c and 5d are opposed to each other. Is. The end face 5e may be on the inside and the end face 5f may be on the outside.

  The wire used to make the coil is not limited to the flat wire, and the flat wire described in the second embodiment can be used as appropriate. Needless to say, the coil may be formed by the round wire described in the first embodiment.

  In addition, you may create a coil using the electric wire member from which the width | variety and thickness are changing in the length direction of a wire. FIG. 19A is a plan view of an electric wire member whose width and thickness are changed in the length direction of the wire, and FIG. 19B is a cross-sectional view. FIG. 20A is a plan view of a coil obtained by winding a rectangular wire 34 shown in FIGS. 19A and 19B, and FIG. A rectangular wire 34 shown in FIG. 19 has rectangular grooves 35a, 35b, and 35c similar to the rectangular wire 5 of FIG. 8, and the width 35d is continuously reduced and the thickness 35e is increased. The cross-sectional area perpendicular to the wire direction at an arbitrary location is the same. The coils shown in FIGS. 20A and 20B are obtained by winding the flat wire 34 so that the flat surfaces having the width 35d face each other, as described in FIG.

  FIG. 21A is a front view of the schematic diagram of the coil 36 described in FIG. 19, and FIG. 21B is an upper cross-sectional view. As shown in FIG. 21B, the cross-sectional view of the coil having this configuration is substantially trapezoidal. 22A, 22B, and 22C show a front view, a top view, and a side view of the stator core 37, respectively. FIG. 23 is a plan view of a stator coil in which the coil of FIG. 21 is mounted on the stator core 37. 21 to 23, the grooves 35a, 35b, and 35c are not shown.

  21 may be applied to the rotor coil by mounting it on a plurality of cores formed on the outer peripheral surface of the rotor toward the inner peripheral surface of the stator. In addition to the coil of FIG. 21, the coils described in FIGS. 17 and 18 may be used for the stator coil and the rotor coil, or the coil using the wire described in the first and second embodiments is applied. Also good. These coils may be applied to a transformer.

  INDUSTRIAL APPLICABILITY According to the wire, coil, stator coil, rotor coil, transformer, and wire manufacturing method of the present invention, it is possible to provide a wire that reduces eddy currents and a method for manufacturing the wire that can be manufactured more inexpensively. It is useful as a coil, a stator coil, a rotor coil, a transformer, and the like.

(A) Front view of the electric wire member in Embodiment 1 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 1 concerning this invention (A) Front view of the electric wire member in Embodiment 1 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 1 concerning this invention The front view of the electric wire member in Embodiment 1 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 1 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The front view of the electric wire member in Embodiment 2 concerning this invention (b) Sectional drawing of the electric wire member in Embodiment 2 concerning this invention The principal part front view of the roller used for the processing method of the electric wire member in Embodiment 3 concerning this invention (b) The principal part side view (c) of the roller used for the processing method of the electric wire member in Embodiment 3 concerning this invention S part enlarged view of (a) Sectional drawing of the wire in which the groove | channel was formed with the roller used for the processing method of the electric wire member in Embodiment 3 concerning this invention. (A) Front view of main part and flat wire of groove forming device for explaining processing method of electric wire member in embodiment 3 according to present invention (b) Electric wire member in embodiment 3 according to present invention Side view of main part of groove forming apparatus and flat wire for explaining processing method (c) Enlarged view of T part of (a) (A) Cross-sectional view of a flat wire for explaining a method for processing an electric wire member according to a third embodiment of the present invention (b) A groove formed on one plane by the method for processing an electric wire member according to a third embodiment of the present invention (C) Cross-sectional view of a rectangular wire having grooves formed on both planes by the method of processing an electric wire member according to the third embodiment of the present invention. (A) Front view of die and flat wire for explaining method of processing electric wire member in embodiment 3 according to the present invention (b) View from arrow direction of (a) (c) Inner shape of die Figure showing (A) Front view of die and flat wire for explaining method of processing electric wire member in embodiment 3 according to the present invention (b) View from arrow direction of (a) (c) Inner shape of die Figure showing (A) Side view of the coil according to the fourth embodiment of the present invention (b) Front view of the coil according to the fourth embodiment of the present invention (c) Enlarged view of the u part of (a) (d) According to the present invention Sectional drawing of the flat wire which forms the coil in Embodiment 4 (A) Side view of the coil according to the fourth embodiment of the present invention (b) Front view of the coil according to the fourth embodiment of the present invention (c) Enlarged view of the u part of (a) (d) According to the present invention Sectional drawing of the flat wire which forms the coil in Embodiment 4 (A) Plan view of a rectangular wire forming a coil according to the fourth embodiment of the present invention (b) Cross-sectional view of a rectangular wire forming a coil according to the fourth embodiment of the present invention (A) Front view of the coil according to the fourth embodiment of the present invention (b) Side view of the coil according to the fourth embodiment of the present invention (A) Schematic front view of a coil according to the fourth embodiment of the present invention (b) Upper sectional view of the coil according to the fourth embodiment of the present invention (A) Front view of a stator core on which a coil according to a fourth embodiment of the present invention is mounted (b) Top view of a stator core on which a coil according to a fourth embodiment of the present invention is mounted (c) Embodiment according to the present invention 4 is a side view of a stator core on which a coil in 4 is mounted. The top view which mounted the coil in Embodiment 4 concerning this invention in the stator core

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Round line 1a Center axis 2, 3, 4 groove 4a Entrance part 4b Depth direction 5 Flat wire 5a Width 5b Thickness 6a, 6b, 6c, 6d, 6e Groove

Claims (18)

  A wire rod in which grooves are formed on the surface along the wire rod direction.   The wire according to claim 1, wherein a plurality of the groove portions are formed.   The wire according to claim 1, wherein a member different from the wire is inserted into the groove.   The wire member according to claim 3, wherein the different member is an insulating material.   The wire rod according to claim 1, wherein a cross-sectional shape of the groove portion in a direction substantially perpendicular to the wire rod direction is a wedge shape.   The wire rod according to claim 1, wherein a cross-sectional shape of the groove portion in a direction substantially orthogonal to the wire rod direction is a rectangle. The wire is a round wire,
The wire rod according to claim 5 or 6, wherein the wedge-shaped or rectangular cross-sectional shape of the groove portion is formed toward an axis of the wire rod. The wire is a round wire,
The wire rod according to claim 5 or 6, wherein the wedge-shaped or rectangular cross-sectional shape of the groove portion is formed in a state deviating from an axis of the wire rod.   The wire according to claim 1, wherein the groove is formed in a spiral shape along the wire direction.   The wire rod according to claim 2, wherein the plurality of groove portions have intersecting portions.   The wire according to claim 1, wherein the wire is a flat wire and has a thickness and a width that change in a wire direction.   The wire according to claim 1, wherein the wire is a high-frequency wire.   A coil obtained by winding the wire according to claim 1 a plurality of times.   A coil in which the wire according to claim 11 is wound a plurality of times, the coil having a substantially trapezoidal cross-sectional shape. A substantially cylindrical stator having a plurality of cores;
The stator coil provided with the coil of Claim 13 or 14 arrange | positioned at the said core. A rotor having a plurality of cores;
The rotor coil provided with the coil of Claim 13 or 14 arrange | positioned at the said core. A coil according to claim 13 or 14,
A transformer with a core. A first step of forming a groove in the wire;
A second step of injecting or inserting an insulating material into the groove;
And a third step of processing the wire having the insulating material in the groove into a predetermined cross-sectional shape.

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