JP5974752B2 - Coil conductor for rotating electrical machine and coil body - Google Patents

Description

  The present invention relates to a coil wire for a rotating electrical machine in which a covering member is covered around a wire assembly configured by bundling a plurality of wires, and a coil body using the same.

  2. Description of the Related Art Conventionally, for example, International Publication No. 2012/049775 (hereinafter referred to as Patent Document 1) discloses a motor lead wire configured by spirally winding a belt-like member around an outer peripheral surface of a collective lead wire formed by bundling a plurality of lead wires. Has been. It is described that the belt-like member used for the motor conductor is made of metal and has an electrical resistance value equal to or higher than the electrical resistance value of the conductor. As a result, the durability when bending to make this motor conductor into a coil becomes high, and a plurality of conductors can be maintained in a bundled state without breaking, and the generation of eddy currents in the coil can be reduced. It is stated.

International Publication No. 2012/049775

  In the motor conductor described in Patent Document 1, the entire length of the belt-shaped member is increased in order to spirally wind the belt-shaped member having a relatively high electrical resistance value over the entire length of the conductive wire, and a path through which current flows correspondingly. The resistance loss due to the longer length may increase, and the reduction in eddy current loss may be offset.

  Moreover, the effect of increasing the bending strength of the motor conductor cannot be expected so much by spirally winding a strip-shaped member made of a thin metal foil around the outer circumferential surface of the assembly conductor over the entire length of the motor conductor. Therefore, when this motor lead is formed in a coil and attached to the motor stator, sufficient rigidity cannot be obtained in the motor lead of the part constituting the coil end part, and the coil end part is firmly fixed. There are things that cannot be done.

  An object of the present invention is to provide a rotating electrical machine coil conductor and a coil body that can suppress an increase in resistance loss and can secure the strength of a coil end portion.

  A coil wire for a rotating electrical machine according to the present invention is a coil wire for a rotating electrical machine in which a conductive coating member is coated around a strand assembly configured by bundling a plurality of strands each coated with insulation. Of the coil conducting wire, a spiral insulating portion is formed on the covering member of the portion in the slot disposed in the slot of the stator of the rotating electric machine, and on the other hand, it is disposed outside the slot of the stator to constitute the coil end. The coil end portion is not formed with a spiral insulating portion on the covering member.

  In the coil lead for a rotating electrical machine according to the present invention, the covering member may be made of a metal pipe.

  In this case, the spiral insulating portion may be a spiral slit formed in the tube material.

Further, in the coil conductor for a rotating electrical machine according to the present invention, the covering member in the slot inner portion is formed of a metal strip member spirally wound around the outer peripheral surface of the strand assembly, Each covering member of the coil end portion may be connected by a joint portion .

  In this case, the spiral insulating portion in the slot inner portion may be constituted by a gap formed between adjacent strip-shaped members every time the wire assembly circulates.

  Further, in this case, the band-shaped member has an insulating layer on one surface, and the spiral insulating portion in the slot inner portion has the widthwise edges of the band-shaped member wound with the band-shaped member spirally. You may be comprised by the overlap part overlapped via the insulating layer.

  Further, in the coil wire for a rotating electrical machine according to the present invention, the conductor is formed as a substantially U-shaped conductor segment having two leg portions and a continuous portion continuous to one end portion of each leg portion. The continuous portion of the segment and the distal end portion of the leg portion may constitute the coil end portion, and the intermediate portion excluding the distal end portion of the leg portion may constitute the in-slot portion.

  Furthermore, the coil body for a rotating electrical machine according to the present invention is formed in a coil shape so that the coil wire for the rotating electrical machine having any one of the above configurations is wound around the teeth of the stator of the rotating electrical machine.

  According to the coil wire for a rotating electrical machine and the coil body according to the present invention, an increase in resistance loss can be suppressed, and the fixed state of the coil end portion can be strengthened.

It is a figure which shows the perspective view of the flat conducting wire which is one embodiment of this invention. It is a figure which shows a mode when the flat conducting wire of FIG. 1 is formed in a substantially U-shaped conductor segment, and is mounted | worn with a stator. It is an enlarged view of the A section in FIG. It is a figure which shows the modification of the part in the slot of a flat conducting wire. It is a figure which shows another modification of the part in the slot of a flat conducting wire. It is sectional drawing of the overlap part of the strip | belt-shaped members in FIG. It is a figure which shows what the flat conducting wire in which the part in a slot shown in FIG. 4 or FIG. 5 is formed is formed as a U-shaped conductor segment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  In the following description, a rectangular conductor having a rectangular cross section will be described as an example of a motor conductor, but the present invention is not limited to this, and the present invention is applicable to other polygonal conductors or conductors having a circular cross section. Can be widely applied.

  FIG. 1 is a perspective view showing a flat conducting wire 1 according to an embodiment of the present invention. As shown in the figure, the flat conducting wire 1 includes a plurality of strands 10 and a covering member 16.

  The strand 10 has an insulating film 14 provided on the outer peripheral surface of the core wire 12. The core wire 12 is a conductor, and is formed in a linear shape from a conductive metal such as copper, aluminum, silver, gold, or an alloy thereof. The insulating film 14 is formed of an insulator such as enamel resin or metal oxide, for example.

  As shown in FIG. 1, the flat conducting wire 1 is formed by covering the outer peripheral surface of a wire assembly 18 configured by bundling a plurality of strands 10 with a covering member 16. In the rectangular conductor wire 1 of the present embodiment, an example is shown in which the strand assembly 18 is configured by arranging a total of 8 strands 10 of 2 vertically and 4 laterally. However, the present invention is not limited to this. Is not to be done. Further, in the present embodiment, the cross section of the flat conducting wire 1 is formed in a rectangular shape or a rectangular shape including the short side 20 and the long side 22.

  The covering member 16 is formed of a conductive tube material. Specifically, the covering member 16 is made of, for example, a metal pipe material such as copper, aluminum, iron, or an alloy thereof. The covering member 16 is formed so as to be in close contact with the outer peripheral surface of the wire assembly 18 bundled in a rectangular shape by being molded as described later.

  In this way, the rectangular conducting wire 1 has a cross-sectional area because the covering member 16 made of a metal pipe is coated on the outer peripheral surface of the wire assembly 18 formed by bundling a plurality of wires 10 in a close contact state. The ratio of the conductor part which occupies can be enlarged. Thereby, the space factor when this flat conducting wire 1 is formed in the coil and disposed in the slot of the motor stator is improved, and there is an advantage that the motor efficiency can be increased.

  FIG. 2 is a view showing a state in which the rectangular conducting wire 1 of FIG. 1 is formed in a substantially U-shaped conductor segment 2 and attached to the motor stator 3. FIG. 3 is an enlarged view of an in-slot portion of the flat conducting wire 1 surrounded by a one-dot chain line circle A in FIG. Here, FIG. 2 is a plan view showing a part of the cylindrical motor stator 3 as seen from the inner peripheral side, and is formed between the teeth 4 having rectangular end faces and the teeth 4. Slot 5 is shown.

  As shown in FIG. 2, in the present embodiment, the flat conducting wire 1 is formed as a conductor segment 2 having a substantially U shape and is attached to the motor stator 3. The conductor segment 2 includes two leg portions 24a and 24b extending in parallel with each other, and a continuous portion 26 provided continuously to one end portion (lower end portion in FIG. 2) of each leg portion 24a and 24b. Have. The conductor segment 2 can be formed by bending a flat conducting wire 1 cut to a predetermined length.

  The leg portions 24 a and 24 b of the conductor segment 2 each include an in-slot portion (intermediate portion) 28 and a tip portion 30. The in-slot portion 28 is a portion that is disposed in the slot 5 when the two legs 24 a and 24 b of the conductor segment 2 are inserted and disposed in the slot 5 of the motor stator 3. On the other hand, the distal end portion 30 extends axially from the slot 5 of the motor stator 3 when the two legs 24a and 24b of the conductor segment 2 are inserted into the slot 5 of the motor stator 3 (up and down in FIG. 2). Direction) is a portion that protrudes outward and constitutes a coil end portion when formed as a coil. The continuous portion 26 of the conductor segment 2 is also disposed outside the slot 5 of the motor stator 3 on the other side in the axial direction when formed as a coil, and constitutes a coil end portion.

  The distal end portion 30 of one leg portion 24a of the conductor segment 2 is bent in the arrow A direction, and the other leg portion 24b is bent in the arrow B direction. That is, the tip portions 30 of the two leg portions 24a and 24b are bent in a direction approaching each other. The distal end portion 30 of the one leg portion 24a is inserted into the slot 5, for example, and another conductor segment (not shown) arranged radially inward (front side in the direction perpendicular to the plane of FIG. 2). ) Is bent and connected to the tip of the other leg by welding or caulking. Further, the distal end portion 30 of the other leg portion 24b is inserted into the slot 5 and arranged on the radially outer side (the back side in the direction perpendicular to the paper in FIG. 2), for example. 1) is bent and connected to the tip of one leg by welding or caulking.

  By connecting the plurality of conductor segments 2 in this way, a coil is formed around the tooth 4 through the slot 5. The coil in this case is a coil in which both side surfaces on the short side 20 side of the flat wire 1 are wound as side surfaces on the inner peripheral side and the outer peripheral side, and is also referred to as an edgewise coil.

  As shown in FIGS. 2 and 3, a spiral slit 32 is formed in the covering member 16 of the in-slot portion 28 of the conductor segment 2. Such a slit 32 can be formed in advance in the tube material to be the covering member 16 by, for example, laser processing or cutting. The slit 32 corresponds to the spiral insulating portion in the present invention.

  On the other hand, the helical slits as described above are not formed in the tip portions 30 of the leg portions 24a and 24b and the connecting portion 26 which constitute the coil end portion of the conductor segment 2. As a result, the tip portion 30 and the connecting portion 26 that constitute the coil end portion have a moderately higher strength against bending than the in-slot portion 28 due to the rigidity of the covering member 16 made of a metal tube. Yes. Therefore, there is an advantage that workability when the tip portion 30 is bent and welded is improved, and the fixed state of the coil end portion when formed as a coil becomes stronger.

  The conductor segment 2 having the above configuration is manufactured as follows.

  First, a plurality of strands 10 are arranged in 2 rows and 4 columns and bundled to form a strand assembly 18. Then, the wire assembly 18 is inserted into a metal tube material that becomes the covering member 16. Here, the pipe may be a cylindrical pipe. Further, it is preferable that the above-described spiral slit 32 is previously formed in the pipe material.

  Next, after rolling the tube material through which the wire assembly 18 is inserted, it is pulled down through a die (not shown) formed in a predetermined size, so that the rectangular conductor wire 1 having a rectangular cross section having a desired size is formed. Can be manufactured.

  Then, in order to ensure the insulation of the flat conducting wire 1, for example, an enamel resin is applied to the outer peripheral surface of the flat conducting wire 1 and baked. Thereby, manufacture of the flat conducting wire 1 is complete | finished. And the conductor segment 2 is completed by cut | disconnecting the flat conducting wire 1 for every predetermined length, and bending it in a substantially U shape.

  As described above, according to the rectangular conducting wire 1 of the present embodiment, the spiral slit 32 is formed in the covering member 16 of the slot inner portion 28 where the alternating magnetic flux is linked, whereby the covering member 16 of the slot inner portion 28 is formed. The magnetic flux linkage area becomes smaller, and eddy current loss can be reduced accordingly.

  Further, in a coil formed by bending and connecting a substantially U-shaped conductor segment 2 made of a flat conducting wire 1, the covering portion 26 that constitutes the coil end portion and the tip portion 30 of the leg portions 24a and 24b are covered. The member 16 is not formed with a spiral slit, and the covering member 16 is formed of a metal pipe. Thereby, resistance increase can be suppressed compared with the case where a helical slit is formed over the entire length of the flat conducting wire 1.

  Furthermore, the distal end portion 30 of the conductor segment 2 constituting the coil end portion can be provided with an appropriate rigidity by being covered with a metal tube material having no spiral slit, and the fixed state of the coil end portion can be strengthened. Can be made.

  Next, a modification of the flat conducting wire will be described with reference to FIGS. In the following, the same or similar reference numerals are given to the same components as those of the flat conducting wire 1, and overlapping description will not be given.

  FIG. 4 is a view showing an in-slot portion 28A of the flat conductor 1A according to the first modification. As shown in the figure, the covering member 16a of the slot inner portion 28A of the flat conducting wire 1A is formed by spiraling, for example, a metal strip member 34 on the outer peripheral surface of the strand assembly 18 formed by bundling a plurality of strands 10. It is configured to be wound around. For the strip-shaped member 34, for example, a metal tape made of copper, aluminum, iron, or an alloy thereof can be used. Further, the belt-like member 34 is wound so that a gap 36 is formed between the neighboring belt-like members 34 every time the wire assembly 18 circulates. The gap 36 corresponds to the spiral insulating portion in the present invention.

  Also with the rectangular conductor 1A of the first modification, the conductive covering member 16a of the slot inner portion 28A is configured by the metal strip member 34 being spirally wound with a gap 36 therebetween. The eddy current loss can be suppressed by reducing the magnetic flux linkage area at 28. Further, since the covering member 16a can be formed by spirally winding the belt-like member 34, there is an advantage that the slot inner portion 28A can be easily formed.

  Note that, instead of the gap 36 in this modification, the adjacent belt-shaped members 34 wound spirally may be connected with an insulating adhesive or cloth.

  FIG. 5 is a view showing an in-slot portion 28B of the flat conducting wire 1B of the second modification. As shown in the figure, the covering member 16b of the slot inner portion 28B of the flat conducting wire 1B is formed by spiraling, for example, a metal strip member 34 on the outer peripheral surface of the strand assembly 18 formed by bundling a plurality of strands 10. It is the same as that of the said 1st modification in the point comprised by winding.

  However, the second modified example is different in that it is wound so as to form an overlapping portion 37 in which edges in the width direction of the band-shaped member 34 wound spirally overlap each other. In this case, as shown in FIG. 6, the band-shaped member 34 has a two-layer structure of a metal layer 38 and an insulating layer 40, and the band-shaped members 34 overlap with each other through the insulating layer 40 in the overlapping portion 37. . For the metal layer 38, for example, a metal tape made of copper, aluminum, iron, or an alloy thereof can be used. Note that the overlapping portion 37 having a spiral shape in this modification corresponds to the spiral insulating portion in the present invention.

  Similarly to the case of the first modified example, the rectangular conductor 1B of the second modified example can also be formed by spirally winding the belt-like member 34 to form the covering member 16b, so that the slot inner portion 28B can be easily formed. is there. Further, by winding the belt-like member 34 in a spiral manner while forming the overlapping portion 37 as described above, the binding force of the strand assembly 18 becomes larger than that in the first modified example, and each strand 10 is separated. It is possible to reliably hold the assembled state without breaking.

  In this modification, the insulating layer is provided on the entire surface of the belt-shaped member 34. However, the present invention is not limited to this, and the insulating layer may be formed only on the portion corresponding to the overlapping portion.

  FIG. 7 corresponds to FIG. 2, showing substantially U-shaped conductor segments 2 </ b> A and 2 </ b> B formed of the rectangular conductors 1 </ b> A and 1 </ b> B including any of the slot inner portions 28 </ b> A and 28 </ b> B of the first and second modifications. It is a figure to do. In this case, the continuous portion 26 and the leg tip portion 30 are the same as the conductor segment 2 described above, and the in-slot portions 28A and 28B and the continuous portion 26 and the leg tip portion 30 are connected by the welded portion 42. ing. As a result, the strands 10 included in the conductor segments 2A and 2B are electrically connected, and the covering members 16, 16a and 16b covering the outer peripheral surface of the strand assembly 18 are also electrically connected.

  Even when the coil is formed using the conductor segments 2A and 2B configured as described above, the same effects as those of the conductor segment 2 can be obtained. That is, in the coil formed by bending and connecting the substantially U-shaped conductor segments 2A and 2B made of the rectangular conductive wires 1A and 1B, the covering portion 26 and the leg tip portion 30 that constitute the coil end portion are covered. Since the member 16 is not formed with a spiral slit or the like, and the covering member 16 is formed of a metal pipe material, compared with the case where the spiral slit or the like is formed over the entire length of the flat conducting wires 1A and 1B. Increase in resistance can be suppressed.

  Further, the end portions 30 of the conductor segments 2A and 2B constituting the coil end portion can be provided with an appropriate rigidity by being covered with a metal tube material having no spiral slit or the like. The fixed state of can be made strong.

  The coil lead wire for a rotating electrical machine according to the present invention is not limited to those of the above-described embodiment and modification examples, but various items within the scope of the claims of the present application and the equivalent scope thereof. Changes and improvements are possible.

  For example, in the above description, the rectangular conductor wire 1 is formed as a U-shaped conductor segment, and a plurality of the conductor segments are connected by welding or the like to constitute a coil. However, the present invention is not limited to this. The coil may be formed by winding a coil conductor having a slot inner portion formed at a predetermined interval continuously around a tooth or bobbin in a coiled state.

  1, 1A, 1B rectangular conductor, 2, 2A, 2B conductor segment, 3 motor stator, 4 teeth, 5 slots, 10 strands, 12 core wires, 14 insulation coating, 16, 16a, 16b covering member, 18 strand assembly , 20 short side, 22 long side, 24a, 24b leg part, 26 connecting part, 28, 28A, 28B slot inner part, 30 tip part or leg tip part, 32 slit, 34 strip member, 36 gap, 37 overlap Part, 38 metal layer, 40 insulating layer, 42 welded part.

Claims (8)

A coil conductor for a rotating electrical machine in which a conductive coating member is coated around a wire assembly configured by bundling a plurality of wires each coated with insulation,
Among the coil conductors, a spiral insulating portion is formed on the covering member in the slot portion disposed in the slot of the stator of the rotating electrical machine, and on the other hand, the coil that is disposed outside the slot of the stator and constitutes the coil end A spiral insulating part is not formed on the covering member of the end part,
Coil wire for rotating electrical machines. The coil lead for a rotating electrical machine according to claim 1,
The coil conductor for a rotating electrical machine, wherein the covering member is made of a metal pipe. The coil lead for a rotating electrical machine according to claim 2,
The coil conductor for a rotating electrical machine, wherein the spiral insulating portion is a spiral slit formed in the tube material. The coil lead for a rotating electrical machine according to claim 1,
The covering member of the inner portion of the slot is formed by a metal band member spirally wound around the outer peripheral surface of the wire assembly, and the covering members of the inner portion of the slot and the coil end portion are connected by a joint portion . A coil conductor for a rotating electrical machine, characterized in that The coil lead for a rotating electrical machine according to claim 4,
The coil conductor for a rotating electrical machine, wherein the spiral insulating portion in the slot inner portion is constituted by a gap formed between adjacent strip-shaped members every time the wire assembly circulates. The coil lead for a rotating electrical machine according to claim 4,
The band-shaped member has an insulating layer on one surface, and the spiral insulating portion in the slot inner portion has the widthwise edges of the band-shaped member on which the band-shaped member is spirally wound via the insulating layer. A coil wire for a rotating electrical machine, characterized by comprising overlapping portions. In the coil lead wire for rotating electrical machines according to any one of claims 1 to 6,
Formed as a substantially U-shaped conductor segment having two leg portions and a continuous portion provided continuously to one end portion of each leg portion, and a continuous portion of the conductor segment and a tip portion of the leg portion; Constituting the coil end portion, and an intermediate portion excluding the tip portion of the leg portion constituting the slot inner portion.   A coil body for a rotating electrical machine, wherein the coil lead wire for the rotating electrical machine according to any one of claims 1 to 7 is formed in a coil shape so as to be wound around a tooth of a stator of the rotating electrical machine.

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