JP2013191308A - Coated lead wire and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a coated lead wire that allows a simplified step of wiring around a core and enhances a space factor of the coil irrespective of the material of a constructional element and the shape of a slot.SOLUTION: A coated lead wire 4 for a coil of a rotary electric machine uses a plurality of bunch stranded conductors 42 each being formed by twisting a plurality of conductor strands 41. The plurality of bunch stranded conductors 42 are disposed side by side so that the adjacent bunch stranded conductors 42 are contacted with each other and the centers of gravity of cross sections of the bunch stranded conductors 42 orthogonal to an extending direction thereof are aligned in a row. The circumferences of the plurality of bunch stranded conductors 42 disposed side by side are coated with a flexible insulating coating material 46.

Description

  The present invention relates to a coated conductor for a coil of a rotating electrical machine and a rotating electrical machine configured using the coated conductor.

  A stator or rotor provided in a rotating electrical machine as an electric motor or a generator may be configured by attaching a coil to a core having a plurality of slots. For example, Japanese Patent Application Laid-Open No. 09-009588 (Patent Document 1) describes a stator including a coil in which a conductor wire having a circular cross section is wound around a plurality of slots distributed in the circumferential direction of the stator core. Has been. That is, the stator of Patent Document 1 includes a covered conductive wire configured by a plurality of conductor wires having a circular cross section.

  As described above, in a coated conductor configured using a conductor wire having a circular cross section, a gap is easily generated between the conductor wires in the slot when the covered conductor is attached to the stator, and the coil space factor is increased. It is difficult to increase. In order to increase the space factor by reducing the gap between the conductor strands, it is also effective to reduce the diameter of the conductor strand. However, when reducing the diameter of the conductor wire, it is necessary to devise a technique so as not to break the wire when it is wound around the stator core, and the winding process takes a long time because the number of times of winding around the stator core increases. is there. On the other hand, in order to increase the space factor, it is also effective to form a coil using a conductor wire having a rectangular cross section. However, the shape of the slot is also limited to a substantially rectangular shape corresponding to the cross-sectional shape of the conductor wire, and there is a problem that the shape of the slot or the tooth cannot always be an optimum shape.

  Japanese Patent Application Laid-Open No. 2011-091943 (Patent Document 2) describes that a coil is configured using a coated conductor provided with a deformable insulator on the outer periphery of a conductor bundle in which a plurality of conductors are bundled. Yes. In Patent Document 2, it is said that the shape of the conductor bundle (cross-sectional shape of the coated conductor) can be changed to an arbitrary shape, and the space factor between the coated conductors can be reduced to increase the space factor. However, referring to FIG. 5 to FIG. 9 of Patent Document 2, in order to freely deform the cross-sectional shape of the covered conductor, the insulator covering the outer periphery of the conductor bundle has a relatively high stretchability. It can be said that it is necessary to configure using materials. That is, there is a problem that the space factor cannot necessarily be increased depending on the material of the insulator constituting the coated conductor.

JP 09-009588 A JP 2011-019443 A

  Therefore, it is desired to realize a coated conductor capable of simplifying the winding process around the core and increasing the coil space factor regardless of the material of the component and the slot shape.

  According to the present invention, the characteristic configuration of the coated conductor for the coil of the rotating electrical machine uses an aggregate stranded wire formed by twisting a plurality of conductor strands, and a plurality of the aggregate stranded wires are adjacent to each other. In a state where they are in contact with each other, they are arranged in parallel so that the center of gravity of the cross section perpendicular to the extending direction of the set strands is aligned, and the periphery of the plurality of set strands arranged in parallel is flexible. It is in the point formed by coating with an insulating coating material.

  Here, the periphery of a plurality of aggregate strands is the periphery of a cross section in a plane (extended orthogonal plane) orthogonal to the extending direction of the coated conducting wire. The “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary.

  According to this characteristic configuration, the use of the assembly stranded wire formed by twisting a plurality of conductor strands makes it easy to form a covered conductor while preventing the conductor strands from being loosened before being covered with the insulating coating material. can do. In addition, when a plurality of aggregate strands arranged in parallel so as to be aligned in a row in contact with each other are covered with a flexible insulating coating material, an elliptical shape is formed in a cross section of the extended orthogonal plane A gap can be formed between the insulating coating material and each of the collective stranded wires having a substantially circular shape. In addition, the cross-sectional shape of the insulating coating material on the extended orthogonal plane is made closer to the perfect circle shape from the oval shape at the time of coating, thereby increasing the cross-sectional area of the inner space of the insulating coating material and gathering with the insulating coating material. A gap between the stranded wires can be further expanded and a plurality of conductor strands can be loosened appropriately afterwards. Accordingly, a gap (in-coating gap) in which the conductor strands can move relative to each other in the radial direction of the insulating coating material can be generated. Since the conductor wires can move relative to each other in the gap in the coating, even if the insulating coating does not have high stretchability, the cross-sectional shapes of the coated conductors in the extended orthogonal plane are compared. Can be freely deformed.

  For this reason, when the coated conductor is used for a coil of a rotating electrical machine and attached to the core, the coated conductor can be easily inserted into the slot regardless of the width of the slot opening. In addition, since the assembly stranded wire forming the coated conductor is configured using a plurality of conductor strands, the number of windings around the core can be reduced while increasing the space factor using a thin conductor strand, The winding process of the coated conductor can be made efficient. Furthermore, since the conductor wire is covered with the insulating coating material, the conductor wire can be prevented from being damaged when inserted into the slot, and the electrical insulation can be easily secured. After the insertion into the slot, the adjacent coated conductors are arranged so that they are in contact with each other, so that the gap between the plurality of coated conductors can be kept small, and the coated conductors can be deformed according to the slot shape. In addition, the gap between the coated conductor and the inner wall surface of the slot can be kept small. Therefore, the space factor can be increased. Therefore, according to this characteristic configuration, a coated conductor capable of simplifying the winding process around the core and increasing the coil space factor regardless of the material of the component (insulation coating material) and the slot shape is realized. it can.

  Here, it is preferable that the coated conductor is formed by coating the periphery of the two aggregated stranded wires with the insulating coating material.

  According to this configuration, the above-described covered conductor can be appropriately formed using the minimum number of aggregated strands, and the size of the gap in the sheath is significant and not excessively large. It can be. Therefore, unnecessary reduction of the space factor can be suppressed while ensuring simplification of the winding process around the core.

  In addition, it is preferable that the twist pitch of the plurality of aggregate strands is larger than the twist pitch of the plurality of conductor strands in each of the aggregate strands.

  Note that the twist pitch is along the extending direction of the covered conductor with reference to the diameter of the target conductor, which advances while the target conductor (target conductor) rotates once with the rotation (twist) of the twist. It is the length (length expressed in multiples based on the diameter of the target conductor). More specifically, the twist pitch of the plurality of conductor strands in the assembly strand is that of the assembly strand that proceeds while the assembly strand rotates once with the rotation of the strands of the plurality of conductor strands. It is the length along the extending direction of the coated conductor with the diameter as a reference. The twisting pitch of the plurality of aggregate strands is a covered conductor based on the diameter of the entire plurality of aggregate strands, which advances while the strands of the plurality of aggregate strands rotate. It is the length along the extending direction. When a plurality of aggregate strands are not twisted at all, their twist pitches are infinite.

  According to this configuration, the twists of the plurality of collective strands are loosened as compared to the twists of the plurality of conductor strands in the respective collective strands. Can be easily loosened. As a result, a plurality of conductor strands can be easily loosened, and an in-coating gap can be appropriately generated on the radially inner side of the insulating coating material.

  In addition, it is preferable that a plurality of the aggregate strands are arranged in parallel in a parallel state with substantially no twist.

  According to this configuration, it is possible to easily loosen the plurality of conductor strands on the radially inner side of the insulating coating material and appropriately generate the in-coating gap.

  The conductor wire is preferably a bare wire.

  The “bare wire” is a bare conductor wire whose surface is not covered with an insulator. Therefore, a conductor wire having a coating or coating with an electrically insulating material such as resin on its surface is not included in the bare wire. On the other hand, a conductor wire having an oxide film formed on the surface is included in the bare wire.

  According to this configuration, the sum of the cross-sectional area of the conductor portion of the conductor wire occupying the cross-sectional area of the entire coated conductor wire is compared with the case where the surface of the conductor wire is provided with an insulating film or coating. It becomes easy to ensure large. Accordingly, the density of the conductor portion in the slot can be increased, and the coil space factor can be easily increased.

  In addition, it is preferable that the insulating coating material is formed using a fluororesin.

  According to this configuration, a coated conductor suitable for a coil of a rotating electrical machine is formed by utilizing the properties of a fluororesin excellent in heat resistance, chemical resistance, mechanical strength, electrical insulation, non-adhesiveness, etc. can do. That is, by using an insulating coating material made of a fluororesin, a coated conductor capable of maintaining high mechanical strength and electrical insulation even under high temperature conditions or in the presence of lubricating oil can be realized. In addition, even when an insulation coating material is formed around a plurality of aggregate strands by, for example, hot melt molding, the conductor strands and the insulation coating material constituting each aggregate strand are then easily separated. In a non-adhesive state. Therefore, it is possible to secure more conductor wires that can move on the radially inner side of the insulating coating material, and to ensure a high degree of freedom of deformation of the cross-sectional shape of the coated conductor in the extending orthogonal plane.

  According to the present invention, a characteristic configuration of a rotating electrical machine including a core having a plurality of slots and a coil disposed in the slot and attached to the core includes a plurality of coated conductors constituting the coil. A center of gravity of a cross-section orthogonal to the extending direction of the aggregated strands in a state where adjacent aggregated strands are in contact with each other using the aggregated strands formed by twisting conductor strands. Are arranged in parallel so that they are arranged in a line, and the periphery of the plurality of the stranded wires arranged in parallel is covered with a flexible insulating coating material.

  According to this characteristic configuration, since a collective stranded wire formed by twisting a plurality of conductor strands is used to form a coil attached to the core, the conductor strands are loosened before being covered with the insulating coating material. The coated conductor can be easily formed while suppressing the above. In addition, when a plurality of aggregate strands arranged in parallel so as to be aligned in a row in contact with each other are covered with a flexible insulating coating material, an elliptical shape is formed in a cross section of the extended orthogonal plane A gap can be formed between the insulating coating material and each of the collective stranded wires having a substantially circular shape. In addition, the cross-sectional shape of the insulating coating material on the extended orthogonal plane is made closer to the perfect circle shape from the oval shape at the time of coating, thereby increasing the cross-sectional area of the inner space of the insulating coating material and gathering with the insulating coating material. A gap between the stranded wires can be further expanded and a plurality of conductor strands can be loosened appropriately afterwards. Accordingly, a gap (in-coating gap) in which the conductor strands can move relative to each other in the radial direction of the insulating coating material can be generated. Since the conductor wires can move relative to each other in the gap in the coating, even if the insulating coating does not have high stretchability, the cross-sectional shapes of the coated conductors in the extended orthogonal plane are compared. Can be freely deformed.

  For this reason, when manufacturing the rotating electrical machine by attaching the coated conductor constituting the coil to the core, it is possible to easily insert the coated conductor into the slot regardless of the width of the slot opening. In addition, since the assembly stranded wire forming the coated conductor is configured using a plurality of conductor strands, the number of windings around the core can be reduced while increasing the space factor using a thin conductor strand, The winding process of the coated conductor can be made efficient. Furthermore, since the conductor wire is covered with the insulating coating material, the conductor wire can be prevented from being damaged when inserted into the slot, and the electrical insulation can be easily secured. After the insertion into the slot, the adjacent coated conductors are arranged so that they are in contact with each other, so that the gap between the plurality of coated conductors can be kept small, and the coated conductors can be deformed according to the slot shape. In addition, the gap between the coated conductor and the inner wall surface of the slot can be kept small. Therefore, the space factor can be increased. Therefore, according to this characteristic configuration, the winding process of the coil around the core can be simplified, and the rotating electrical machine capable of increasing the space factor of the coil regardless of the material of the constituent member (insulation coating material) and the slot shape. Can be realized.

It is a perspective view of the rotary electric machine which concerns on embodiment. It is a partial expanded sectional view of a stator. It is a perspective view which shows the structure of the multiple assembly strand wire used as the foundation of a covering conducting wire. It is sectional drawing in the manufacture stage of a covered conducting wire. It is a perspective view which shows the structure of a covered conducting wire. It is a virtual sectional view of a covering conducting wire for explaining a gap in a covering. It is a virtual sectional view of a covering conducting wire for explaining a gap in a covering. It is a figure explaining the manufacturing process of a stator.

  Embodiments of a coated conductor and a rotating electrical machine according to the present invention will be described with reference to the drawings. Here, a case where the coated conductor according to the present invention is applied to the coil 3 of the stator 1 of the inner rotor type rotating electrical machine 100 will be described as an example. As shown in FIG. 5, the coated conductive wire 4 for the coil 3 includes a conductor wire bundle 44 in which a plurality of conductor wires 41 are assembled, and a flexible insulating coating material 46 that covers the periphery of the conductor wire bundle 44. And. That is, the covered conductor 4 has a structure in which a conductor wire bundle 44 formed by collecting a plurality of conductor wires 41 is covered with a flexible insulating coating material 46. The covered conducting wire 4 according to the present embodiment has a feature in the internal structure based on the manufacturing method, and the rotating electrical machine 100 has a feature in that such a covered conducting wire 4 is used. Hereinafter, the overall configuration of the rotating electrical machine 100, the configuration of the coated conductor 4, and the manufacturing method of the stator 1 of the rotating electrical machine 100 will be described in detail in this order.

  In the following description, unless otherwise specified, the “axial direction L”, “circumferential direction C”, and “radial direction R” are the cylindrical core reference surface 21 of the stator core 2 described later (for example, the inner circumference of the stator core 2). Surface) axis.

1. Overall configuration of rotating electrical machine The overall configuration of the rotating electrical machine 100 according to the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the rotating electrical machine 100 includes a stator 1 and a rotor 6 rotatably provided inside the radial direction R of the stator 1. The stator 1 includes a stator core 2 and a coil 3 attached to the stator core 2, and the coil 3 is configured by winding a coated conducting wire 4 around the stator core 2. In FIG. 1, in order to avoid complication, only the portion protruding from the pair of slots 22 is shown for the coil end portion that is the portion of the coil 3 protruding in the axial direction L from the stator core 2, and the other portions The illustration is omitted. In FIG. 1, a cross section of the plurality of covered conductors 4 constituting the coil 3 appears at the end in the axial direction L of the remaining slot 22. Further, in FIG. 1, a part of the rotor 6 is drawn in perspective.

  The stator core 2 is formed using a magnetic material. The stator core 2 can be formed, for example, as a laminated structure in which a plurality of annular plate-shaped electromagnetic steel plates are laminated, or a powdered material formed by pressing a magnetic material powder as a main component. . The stator core 2 has a plurality of slots 22 so that the coil 3 can be wound thereon. In the present embodiment, the stator core 2 corresponds to a “core” in the present invention. Here, the slots 22 extend in the axial direction L of the cylindrical core reference surface 21 of the stator core 2, and a plurality of slots 22 are distributed in the circumferential direction C of the core reference surface 21. The plurality of slots 22 are formed so as to extend radially from the axis of the stator core 2 in the radial direction R. The “cylindrical core reference surface 21” is a virtual surface that serves as a reference for the arrangement and configuration of the slots 22. In the present embodiment, as shown in FIG. 1, a core inner periphery that is a virtual cylindrical surface including end surfaces on the inner side in the radial direction R of a plurality of teeth 23 formed between two adjacent slots 22. The surface is a core reference surface 21. In addition, it is concentric with the cylindrical core inner peripheral surface, and the cross-sectional shape in the axial direction L (when viewed along the axial direction L) is similar to the cross-sectional shape in the axial direction L of the core inner peripheral surface. Cylindrical surfaces (including virtual surfaces) in relation can also be the “cylindrical core reference surface 21” in the present invention. In the present embodiment, as shown in FIG. 1, the stator core 2 is formed in a cylindrical shape. For example, the outer peripheral surface of the stator core 2 can be a “cylindrical core reference surface 21”.

  The stator core 2 has a plurality of slots 22 that are distributed at regular intervals along the circumferential direction C. The plurality of slots 22 have the same shape. The stator core 2 has a plurality of teeth 23 formed between two adjacent slots 22. In the present embodiment, the slot 22 is formed in a groove shape extending in the axial direction L and the radial direction R and having a predetermined width in the circumferential direction C. In the present embodiment, as shown in FIG. 2, since the two side surfaces 23 a facing the circumferential direction C of each tooth 23 are parallel teeth, each slot 22 has a width in the circumferential direction C in the radial direction R. It is formed so that it gradually becomes wider toward the outside. Therefore, the inner wall surface 22a of each slot 22 is opposed to each other in the circumferential direction C and has two planes formed such that the distance between the two planes increases toward the outside in the radial direction R, and the inner plane 22a has a diameter larger than that of the two planes. And a cross-sectional arc-shaped surface that extends outside the direction R and extends in the axial direction L. Each slot 22 has a radial opening 22b that opens in the radial direction R (opens on the inner peripheral surface of the stator core 2), and an axis that opens on both sides (both axial end surfaces) of the stator core 2 in the axial direction L. A directional opening 22c is formed. A slot insulating portion 24 is provided on the inner wall surface 22 a of the slot 22. In this embodiment, the entire inner wall surface 22a is coated with insulating powder, and the slot insulating portion 24 is formed by the coating film of the insulating powder coating.

  Each tooth 23 is formed between two slots 22 adjacent to each other in the circumferential direction C in the stator core 2. In the present embodiment, each tooth 23 is formed such that two side surfaces 23a facing the circumferential direction C of the tooth 23 (hereinafter simply referred to as “tooth side surface 23a”) are parallel to each other. That is, the stator core 2 in the present embodiment includes parallel teeth. Here, a circumferential protrusion 23b that protrudes in the circumferential direction C with respect to the other part of the tooth side surface 23a is formed at the tip of each tooth 23. As a result, most of the two tooth side surfaces 23a are formed so as to be parallel to each other excluding the stepped portion for forming the circumferential protrusion 23b. As is apparent from FIG. 2, these two tooth side surfaces 23 a are arranged in parallel to the radial direction R.

  As described above, each tooth 23 is provided with the circumferential protrusion 23b at the tip, so that the opening width W2 of the radial opening 22b of each slot 22 is further from the back side of the slot 22 (outside of the radial direction R). ) Is narrower than the part. Here, the opening width W2 of the radial opening 22b is the width in the circumferential direction C of the radial opening 22b, that is, the width in the direction orthogonal to the radial direction R. The opening width W2 is a width of the radial opening 22b in a plane orthogonal to the axial direction L of the stator 1, as shown in the cross section of FIG. In each slot 22, the opening width W2 of the radial opening 22b is narrower than the width in the circumferential direction C at the portion where the coil 3 is disposed. Thus, the stator core 2 according to the present embodiment has the semi-open slot 22.

  In this embodiment, the rotating electrical machine 100 is a three-phase AC motor or a three-phase AC generator driven by three-phase AC (U-phase, V-phase, W-phase). Therefore, the coil 3 of the stator 1 is divided into a U-phase coil, a V-phase coil, and a W-phase coil corresponding to each of the three phases (U-phase, V-phase, and W-phase). Therefore, the U-phase, V-phase, and W-phase slots 22 are arranged in the stator core 2 so as to repeatedly appear along the circumferential direction C. In this example, the stator core 2 has two U-phase slots into which U-phase coils are inserted and two V-phase coils are inserted so that the number of slots per pole per phase is “2”. The V-phase slots and the two W-phase slots into which the W-phase coils are inserted are arranged so as to repeatedly appear along the circumferential direction C in the order described. The number of slots per phase per pole can be changed as appropriate, for example, “1”, “3”, and the like. Further, the number of phases of the AC power source that drives the rotating electrical machine 100 can be changed as appropriate, and can be set to, for example, “1”, “2”, “4”, and the like.

  The coil 3 is configured by winding the coated conductive wire 4 around the stator core 2. At this time, various known methods can be used for winding the coated conductive wire 4 around the stator core 2. For example, the coil 3 can be configured by winding the coated conductive wire 4 around the stator core 2 by a combination of one of lap winding and wave winding and one of concentrated winding and distributed winding.

  On the inner side in the radial direction R of the stator 1 (stator core 2) as an armature, a rotor 6 as a magnetic field including a permanent magnet or an electromagnet is disposed so as to be rotatable relative to the stator 1. Then, the rotor 6 is rotated by the rotating magnetic field generated from the stator 1. That is, the rotating electrical machine 100 according to the present embodiment is an inner rotor type rotating field type rotating electrical machine.

2. Next, the covered conductor 4 that constitutes the coil 3 will be described. The coated conducting wire 4 is a conductor constituting the coil 3 of each phase, and the coil 3 is constructed by winding the coated conducting wire 4 around the stator core 2. As shown in FIG. 5, the coated conductive wire 4 includes a conductor wire bundle 44 formed by aggregating a plurality of conductor wires 41 and a flexible insulating coating material 46 covering the periphery of the conductor wire bundle 44. Have.

  The conductor wire 41 is a linear conductor made of, for example, copper or aluminum. As shown in FIG. 6, in this embodiment, each conductor wire 41 has a circular cross-sectional shape in an extending orthogonal plane P (see FIG. 5) that is a plane orthogonal to the extending direction A of the covered conducting wire 4. A shape having a relatively small diameter is used. For example, a conductor wire 41 having a diameter (element wire diameter D3) of 0.2 mm or less is preferably used. In the present embodiment, a bare wire is used as the conductor wire 41. That is, the bare conductor 41 has a conductor surface such as copper or aluminum that is not covered with an insulator, and the conductor surface is exposed. By the way, an oxide film formed by oxidizing the surface of the conductor may have weak electrical insulation, but such an oxide film is not included in the insulator here. Accordingly, the conductor wire 41 made of a bare wire also includes a conductor having an oxide film formed on the surface thereof. It is preferable that an insulating film made of an electrically insulating material such as a resin (for example, polyamideimide resin or polyimide resin) is formed on the surface of the conductor wire 41. This insulating film is formed as a film that covers the surface of each conductor wire 41, unlike an insulating coating material 46 described later.

  In the present embodiment, the plurality of conductor strands 41 constituting the coated conductor 4 are provided in the form of a collective strand 42 formed by twisting the plurality of conductor strands 41 (see FIG. 3).

  Here, the extension of the covered conducting wire 4 with reference to the diameter (maximum diameter) of the aggregated stranded wire 42 that advances while the aggregated stranded wire 42 makes one revolution with the rotation of the strands of the plurality of conductor strands 41. As a length along the direction A, a twist pitch T1 of a plurality of conductor strands 41 in the aggregate strand 42 is defined. Then, the twist pitch T1 in the collective stranded wire 42 can be set to, for example, 25 to 450 times the diameter of the collective stranded wire 42. By setting it to 25 times or more, the conductor element 41 can be easily loosened later. Moreover, by setting it as 450 times or less, the conductor strand 41 before the coating | cover with the insulation coating material 46 hardly arises, and workability | operativity can be improved.

  In the present embodiment, the coated conductor 4 is formed using a plurality of such aggregated stranded wires 42. The plurality of aggregate strands 42 are provided in a state where the adjacent aggregate strands 42 are in contact with each other and arranged in parallel so that the center of gravity of the cross section in the extending orthogonal plane P is aligned. Here, “the centroids are arranged in a line” means that the imaginary line segment connecting the centroids of the respective set twisted wires 42 is linear as a whole (a concept including some bends, bends, etc.). Therefore, for example, a configuration in which a plurality of aggregate strands 42 are gathered as a whole, and a virtual line segment connecting the center of gravity of each aggregate strand 42 located on the outermost peripheral side has a polygonal shape is a configuration in which the centers of gravity are aligned in a line. Is not included.

  Moreover, in this example, only the two set | twisted twisted wires 42 are used, and the conductor strand 41 which comprises each set twisted wire 42 is provided in the state arrange | positioned in parallel in the mutually contacted state. At this time, in this embodiment, as shown in FIG. 3, the two collective stranded wires 42 are provided in a state of being arranged in parallel in a parallel state with substantially no twist. Here, with reference to the diameter (maximum diameter) of the plurality of collective strands 42 as a whole, which advances while they rotate once in accordance with the rotation of the twists of the plural (two in this example) collective strands 42. As a length along the extending direction A of the covered conductor 4 to be formed, a twist pitch T3 of the plurality of collective strands 42 is defined. Then, the twist pitch T3 of the plurality of collective twisted wires 42 becomes substantially infinite. In this case, the twist pitch T3 of the plurality of aggregate strands 42 is larger than the twist pitch T1 of the plurality of conductor strands 41 in each of the aggregate strands 42.

  Note that the number of conductor strands 41 constituting the aggregated strand 42 depends on the final thickness (cross-sectional area) of the covered conductive wire 4 and the thickness (cross-sectional area) and shape of each conductor strand 41. It is determined. In the present embodiment, as shown in FIG. 2, the thickness (cross-sectional area) of each coated conductor 4 is set so that the space in each slot 22 is filled with six coated conductors 4. The thickness (cross-sectional area) of the collective stranded wire 42 and the number and thickness (cross-sectional area) of the conductor strands 41 are set.

  And the circumference | surroundings of the several (2) assembly | twisting strand 42 arranged in parallel in the parallel state substantially not twisted are coat | covered with the insulation coating material 46, as shown in FIG. 4, and the covering conducting wire 4 is formed. The In addition, in FIG. 4, the external shape of each assembly | twisting twisted wire 42 is shown typically. The insulation coating material 46 is a flexible electrical insulation member, and is provided so as to insulate the periphery of the plurality of aggregate strands 42. Here, the periphery of the plurality of aggregate strands 42 is the periphery (outer periphery) of the cross section of the plurality of aggregate strands 42 in the extending orthogonal plane P. An end portion in the current direction A is not included. That is, the insulation coating material 46 covers the entire circumference around the plurality of aggregated strands 42 and extends except for the connection portion provided at the end in the extending direction A of the plurality of aggregated strands 42. It is provided so as to cover the entire region along the direction A. Here, the connecting portion is a portion for electrically connecting one covered conductor 4 to another covered conductor 4 or another conductor. In addition, since the extending direction as a whole of the plurality of set twisted wires 42 is equal to the extending direction A of the covered conducting wire 4, the same reference sign “A” is given here.

  As the insulating coating material 46, a material having flexibility and electrical insulation is used. Here, “flexibility” means a property that can be bent or bent. “Electrical insulation” is a property that makes electricity very difficult to flow. Moreover, the insulation coating material 46 according to the present embodiment only needs to have sufficient and sufficient elasticity to bend or bend the coated conductor 4 and wind it around the stator core 2, and the elasticity is not so high. Also good. Here, “stretchability” refers to the property of being able to stretch or shrink. Here, in particular, the stretchability in the radial direction of the insulating coating material 46 is not particularly required. For example, a material is used in which the peripheral length after elongation based on the peripheral length in a perfect circle state in which no external force is applied is 130% or less, of which 120% or less, and even 110% or less. Thus, the insulating coating material 46 can be configured.

  In the present embodiment, the insulating coating material 46 is formed using a fluororesin that is excellent in heat resistance, chemical resistance, mechanical strength, non-adhesiveness, etc. in addition to flexibility and electrical insulation. Yes. As such a fluororesin, for example, FEP (a copolymer of tetrafluoroethylene and hexafluoropropylene), PFA (a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether), or the like can be suitably used. . By using these materials particularly suitable for hot melt molding among fluororesins, a plurality of aggregate strands 42 are extended in the extending direction A while supplying an appropriate amount of molten resin material around the plurality of aggregate strands 42. Insulating coating material 46 can be easily formed around a plurality of aggregate strands 42 by moving to.

  Thereafter, the aggregated stranded wire 42 composed of a plurality of conductor strands 41 is finally loosened in the insulation coating material 46, so that one of the plurality of conductor strands 41 is formed radially inward of the insulation coating material 46. A bundle of conductor strands 44 is formed. In the case of hot-melt molding, the inner peripheral surface 46a of the insulating coating material 46 is formed so as to be in close contact with the conductor element wire 41 in conformity with the shape of the surroundings of the plurality of aggregated strands 42. Thereafter, due to the non-adhesiveness (lubricity) of the resin, the conductor wire 41 and the insulating coating material 46 can be easily separated. Further, it is possible to heat-melt and form the insulating coating material 46 while providing a gap with the conductor wire 41 by a technique called tubing extrusion molding or hollow extrusion molding.

  As described above, in the present embodiment, a plurality of assembly strands 42 formed by twisting a plurality of conductor strands 41 are used, arranged in parallel so as to be aligned in a row in a state where they are in contact with each other, and the assembly of the plurality of assemblies The coated conductor 4 is formed by covering the stranded wire 42 with a flexible insulating coating 46. Since the assembly strand 42 formed by twisting a plurality of conductor strands 41 is used, the covered conductor 4 can be easily formed while preventing the conductor strands 41 from being loosened before being covered with the insulating coating material 46. Can do. Moreover, when the circumference | surroundings of the several assembly twisted wire 42 arrange | positioned in parallel are coat | covered with the insulation coating material 46, the insulation coating material 46 used as an ellipse in the cross section in the extended orthogonal plane P becomes a substantially circular shape. A gap can be formed between each set twisted wire 42 (see FIG. 4). Further, the cross-sectional area of the insulating coating material 46 in the extending orthogonal plane P is made closer to an elliptical shape at the time of coating from the elliptical shape at the time of coating (see FIG. 6). The gap between the insulating coating material 46 and the aggregated stranded wire 42 can be further enlarged. Also, the plurality of conductor wires 41 can be loosened appropriately afterwards.

  As shown in FIG. 6, on the radially inner side of the insulating coating material 46, the plurality of conductor strands 41 constituting the conductor strand bundle 44 are assembled without being in close contact with each other. An in-coating gap G is formed between the plurality of conductor strands 41. Such an in-coating gap G is formed as a relatively large gap extending in the axial direction L. For example, if a gap formed so as to extend in the axial direction L is surrounded by the outer surfaces of a plurality of (for example, three) conductor strands 41 whose surroundings are in close contact with each other, an in-cover gap G is formed as a gap larger than such a gap between lines. For example, the in-coating gap G is formed as such a gap between the lines connected to each other via a gap between the adjacent conductor wires 41 at a predetermined interval. Moreover, in this embodiment, the conductor strand bundle 44 and the insulation coating material 46 are not completely bonded but are in a non-bonded state. Therefore, the in-cover gap G is formed not only between the conductor wires 41 but also between the conductor wires 41 and the insulating coating material 46. Since the plurality of conductor strands 41 are arranged apart from each other via the in-coating gap G, they can be relatively moved relative to each other without a large external force acting. The plurality of conductor strands 41 on the radially inner side of the insulating coating material 46 can move relative to each other in at least one of the radial direction and the circumferential direction of the respective coated conducting wires 4.

  Thus, the in-coating gap G is a gap formed inside the insulating coating material 46 so that the conductor wires 41 can move relative to each other on the radially inner side of the insulating coating material 46. Therefore, a gap (for example, the above-mentioned line gap) formed between the conductor wires 41 that are in close contact with each other and cannot be moved relative to each other is not included in the in-cover gap G. Further, the gap formed between the conductor wire 41 and the insulating coating material 46 that are in close contact with each other and cannot be moved relative to each other is not included in the in-coating gap G.

  Here, a virtual circumscribed circle CC circumscribing the conductor strand bundle 44 in a state where the conductor strands 41 adjacent to each other are in contact with each other in the cross section of the extending orthogonal plane P is assumed. As shown in FIG. 6, in the normal state of the coated conductor 4, the diameter of the virtual circumscribed circle CC (the circumscribed circle diameter D <b> 1) matches the inner diameter (the perfect circle inner diameter D <b> 2) of the insulating coating material 46 in the perfect circle state. That is, the relationship “D1 = D2” is established. On the other hand, the coated conducting wire 4 according to the present embodiment has an in-coating gap G on the radially inner side of the insulating coating material 46, and the plurality of conductor strands 41 move relative to each other, and the whole is densely gathered at the center. It is also possible (see FIG. 7). In this case, the circumscribed circle diameter D1 of the virtual circumscribed circle CC is the minimum (minimum circumscribed circle diameter D1n). When the minimum circumscribed circle diameter D1n of the virtual circumscribed circle CC and the true inner diameter D2 of the insulating coating material 46 are compared with each other in the cross section of the extending orthogonal plane P, as is clear from FIG. The circle diameter D1n is smaller than the true circle inner diameter D2 of the insulating coating material 46. That is, the relationship “D1n <D2” is established.

  In the present embodiment, the difference between the minimum circumscribed circle diameter D1n of the virtual circumscribed circle CC and the true circle inner diameter D2 of the insulating coating material 46 is equal to or larger than the element wire diameter D3 of the conductor element wire 41. That is, the relationship “D2-D1n ≧ D3” is established. In the example of FIG. 7, the difference between the minimum circumscribed circle radius (D1n / 2) of the virtual circumscribed circle CC and the true circle radius (D2 / 2) of the insulating coating material 46 matches the strand diameter D3 of the conductor strand 41. I'm doing it. Therefore, in this example, the difference between the minimum circumscribed circle diameter D1n of the virtual circumscribed circle CC and the true circle inner diameter D2 of the insulating coating material 46 is about twice the strand diameter D3 of the conductor strand 41. In this way, by making the minimum circumscribed circle diameter D1n of the virtual circumscribed circle CC smaller than the true circle inner diameter D2 of the insulating coating material 46 beyond the element wire diameter D3, the significant size can be increased. The in-coating gap G can be appropriately and reliably formed. In addition, the ratio (gap ratio) of the cross-sectional area of the in-coating gap G to the cross-sectional area in the insulating coating material 46 in the cross section at the extending orthogonal plane P is, for example, 5% to 35%, and of these, 15% to 30%. Etc.

  As described above, in the present embodiment, a plurality of aggregate strands 42 formed by twisting a plurality of conductor strands 41 are arranged in parallel, and the periphery thereof is covered with the insulating coating material 46 to form the coated conductor 4. Therefore, the in-coating gap G can be formed inside the insulating coating material 46 in the radial direction. Therefore, the conductor strands 41 can move relative to each other in at least one of the radial direction and the circumferential direction of the coated conducting wire 4 in the in-coating gap G. In particular, when the insulating coating material 46 is in a perfect circle state, the in-coating gap G is relatively large, and the relative movement between the conductor wires 41 in the insulating coating material 46 is facilitated. In addition, since the insulating coating material 46 has flexibility, the insulating coating material 46 itself can be easily deformed. Thereby, the covered conducting wire 4 (the conductor wire bundle 44 and the insulating covering material 46) has a configuration in which the cross-sectional shape on the extending orthogonal plane P can be relatively freely deformed (see FIG. 8). In other words, following the deformation of the insulating coating material 46, the conductor wires 41 move relative to each other in the inner coating gap G, so that the cross-sectional shape of the coated conductor 4 can be easily deformed.

3. Method for Manufacturing Stator A method for manufacturing the stator 1 according to this embodiment will be described. FIG. 8 is a diagram for sequentially explaining the manufacturing process of the stator 1 according to the present embodiment. In FIG. 8 and the following description using this, only one of the plurality of slots 22 provided in the stator core 2 is targeted, but the same process is performed for the other slots 22 to perform the stator. 1 can be manufactured.

  First, as shown in FIG. 8A, a plurality of covered conducting wires 4 are inserted into the slots 22. Here, a plurality of coated conducting wires 4 are inserted one by one from the radial opening 22b in order. Thereby, the covered conducting wire 4 is inserted into the slot 22 from the inner side to the outer side in the radial direction R through the radial opening 22b. By the way, in the present embodiment, the outer diameter (perfect outer diameter D4) in a state where the cross-sectional shape of the covered conducting wire 4 on the extending orthogonal plane P is a perfect circle is the circumference of the radial opening 22b of the slot 22. It is larger than the opening width W2 in the direction C. Therefore, when inserting the covered conductor 4 into the slot 22 from the radial opening 22b, the cross-sectional shape of the covered conductor 4 is deformed so that the width in the circumferential direction C of the covered conductor 4 is less than or equal to the opening width W2. Insert with.

  Specifically, in the present embodiment, the coated conductor 4 is pressed from both sides of the predetermined reference direction S in the radial direction of the coated conductor 4, and the cross-sectional shapes of the insulating coating material 46 and the inner conductor bundle 44 are deformed (here Is flattened to make an oval shape. In the present embodiment, the insulating coating material 46 deformed into an oval shape is designed such that the width W1 in the reference direction S can be equal to or smaller than the opening width W2 of the radial opening 22b of the slot 22. Thereby, as shown to Fig.8 (a), the reference direction S which is a press direction with respect to the covering conducting wire 4 is made to correspond to the circumferential direction C which is the width direction of the radial direction opening part 22b, and thereby it becomes the radial direction opening part 22b. On the other hand, the covered conductor 4 can be passed. Therefore, even if the slot 22 is a semi-open type, the covered conductor 4 can be appropriately inserted into the slot 22. In this way, a plurality (six in this example) of the covered conductors 4 are sequentially inserted into the slot 22.

  After that, when all the covered conducting wires 4 are inserted, the plurality of covered conducting wires 4 are pressed from the radial openings 22b of the slots 22 as shown in FIG. Here, the pressing jig 8 is inserted from the radial opening 22b to press the coated conducting wire 4 outward in the radial direction R. As a result, the plurality of coated conductors 4 in the slot 22 are deformed in accordance with the shape of the slot 22, and the gap between the coated conductor 4 and the inner wall surface 22 a of the slot 22 and the gap between the plurality of coated conductors 4. Make it smaller.

  Finally, as shown in FIG. 8C, the closing member 25 is inserted into the radial opening 22 b of the slot 22. Here, the blocking member 25 is disposed between the surface of the plurality of covered conductors 4 in the slot 22 closest to the radial opening 22b (in the radial direction R) and the circumferential protrusion 23b of the tooth 23. Such a member is a so-called wedge. For example, it is possible to insert a flat closing member 25 along the axial direction L from the axial opening 22 c of the slot 22. The closing member 25 supports the covered conductive wire 4 from the inner side in the radial direction R by abutting against the outer surface in the radial direction R of the circumferential protrusion 23 b formed at the tip of the tooth 23. Thereby, it can suppress that the covered conducting wire 4 arrange | positioned in the slot 22 jumps out from the radial direction opening part 22b. Then, the plurality of covered conductors 4 are arranged while maintaining the shape in a state where they are pressed from the radial opening 22b side.

  In the stator 1 manufactured as described above, the arrangement configuration of the covered conducting wire 4 with respect to each slot 22 of the stator core 2 is as follows. That is, as shown in FIG. 2 and FIG. 8C, a plurality of (six in this example) coated conductors 4 are arranged in each slot 22 so that adjacent coated conductors 4 are in contact with each other. Is arranged. In the present embodiment, all the covered conducting wires 4 in each slot 22 are arranged in a line along the radial direction R at the same position in the circumferential direction C. Therefore, the stator 1 has a multi-layer winding structure (in this example, a six-layer winding structure) in which a plurality of coated conductors 4 are arranged in the radial direction R. Here, the number of the covered conducting wires 4 arranged in each slot 22 is counted by paying attention only to the portion arranged in each slot 22.

  Further, the covered conducting wire 4 whose sectional shape in the extending orthogonal plane P is easily deformed is deformed in each slot 22 so as to conform to the shape of the slot 22. Adjacent covered conductors 4 are in contact with each other in each slot 22. More specifically, as shown in FIGS. 2 and 8 (c), each of the plurality of covered conductive wires 4 has a contact surface having a shape along the contact surface of another adjacent covered conductive wire 4, The contact surfaces are in surface contact with each other. Further, all of the plurality of covered conductors 4 arranged in each slot 22 have a contact surface having a shape along the inner wall surface 22a of the slot 22, and contact the inner wall surface 22a by surface contact at the contact surface. ing. Thereby, the clearance gap between the some covered conducting wire 4 and the clearance gap between the covering conducting wire 4 and the inner wall surface 22a of the slot 22 are suppressed small, and the improvement of the space factor of the coil 3 is achieved.

  The above state is realized by deforming each of the plurality of covered conducting wires 4 by being pressed against the inner wall surface 22 a or another covered conducting wire 4 in the slot 22. In the present embodiment, in each slot 22, a plurality of covered conductors 4 are arranged while maintaining the shape in a state of being pressed from the radial opening 22 b side. That is, the plurality of covered conductors 4 are in a deformed state compared to a natural state in which no external force acts on them. At this time, when the cross-sectional shape of each coated conducting wire 4 is deformed following the shape of the inner wall surface 22a, or the coated conducting wires 4 whose cross-sectional shapes are easily deformed are pressed against each other, a plurality of coated conducting wires are formed. Each cross-sectional shape of 4 changes variously. For this reason, as shown in FIGS. 2 and 8C, the plurality of covered conductors 4 arranged in the same slot 22 have different cross-sectional shapes. The shape obtained by combining the cross-sectional shapes of the plurality of covered conductive wires 4 is adapted to the cross-sectional shape orthogonal to the axial direction L of the slot 22.

  In the present embodiment, the inner wall surface 22a of each slot 22 has two planes that are not parallel to each other and faces that are opposed to each other and an arc-shaped plane that extends in the axial direction L. When a relatively thick linear conductor having a fixed cross-sectional shape is disposed in such a slot 22, a gap between the linear conductor and the inner wall surface 22 a of the slot 22 tends to increase. However, according to the configuration of the present embodiment, the cross-sectional shape of each coated conductor 4 is deformed following the shape of the inner wall surface 22a of the slot 22, so that it is easy to reduce the gap with the inner wall surface 22a. The space factor of the coil 3 can be increased. Further, since the coated conductor 4 in which the conductor wire bundle 44 is coated with the insulating coating material 46 is used, the number of times of winding the coated conductor 4 around the stator core 2 can be reduced, and the winding process can be simplified and made more efficient. It is possible.

  After that, the rotating electrical machine 100 can be manufactured by assembling the rotor 6 in a rotatable state inside the radial direction R with respect to the stator 1.

4). Other Embodiments Finally, other embodiments of the coated conductor and the rotating electrical machine according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above-described embodiment, the configuration in which the coated conductor 4 is formed by covering the periphery of the two collective stranded wires 42 arranged in parallel with the insulating coating material 46 has been described. However, the embodiment of the present invention is not limited to this. That is, it is good also as a structure by which the circumference | surroundings of three, four, or five or more collective strands 42 were coat | covered with the insulation coating material 46, and the covering conducting wire 4 was formed. In any of these cases, the plurality of aggregate strands 42 are arranged in parallel so that the center of gravity of the cross section in the extending orthogonal plane P is aligned in a state where the adjacent aggregate strands 42 are in contact with each other.

(2) The twist pitch T1 of the plurality of conductor strands 41 in the aggregate strand 42 described in the above embodiment is merely an example and is not limited to these. Therefore, you may use the assembly twisted wire 42 in which the twist pitch T1 of the several conductor strand 41 is less than 25 times, or the assembly twisted wire 42 larger than 450 times.

(3) In the above-described embodiment, the configuration in which the plurality of collective strands 42 provided in the manufacturing stage of the coated conductor 4 are arranged in parallel in a substantially parallel state without twisting has been described as an example. However, the embodiment of the present invention is not limited to this. That is, a plurality of aggregate strands 42 may be twisted to some extent. In this case, the twist pitch T3 of the plurality of collective twisted wires 42 is not infinite but takes a finite value, but is set to be a sufficiently large value with respect to the twist pitch T1 in the collective twisted wire 42. It is preferable that

(4) In the above embodiment, the resin material constituting the insulating coating material 46 has been described by exemplifying fluororesins such as FEP and PFA. However, the embodiment of the present invention is not limited to this. That is, as the fluororesin, in addition to the above, for example, PTFE (polytetrafluoroethylene), ETFE (copolymer of tetrafluoroethylene and ethylene), PVDF (polyvinylidene fluoride), PCTFE (polychlorotrifluoroethylene), etc. It is also suitable to use. In addition to the fluororesin, various synthetic resins such as a polyester resin, an epoxy resin, and polyphenylene sulfide may be used.

(5) In the above-described embodiment, the configuration in which the insulating coating material 46 is covered around the plurality of aggregate strands 42 by hot melt molding has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, by using a flexible sheet-like member formed in a cylindrical shape and extrapolating this to a plurality of collective stranded wires 42, the insulating coating material 46 is provided around the plurality of collective stranded wires 42. It is good also as a structure made to coat | cover.

(6) In the above embodiment, the difference between the minimum circumscribed circle diameter D1n of the virtual circumscribed circle CC and the true inner diameter D2 of the insulating coating material 46 is equal to or greater than the diameter of the conductor wire 41 (element wire diameter D3). The configuration is described as an example. However, the embodiment of the present invention is not limited to this. That is, if the conductor strands 41 are relatively movable at least on the radially inner side of the insulating coating material 46, the difference between the minimum circumscribed circle diameter D1n of the virtual circumscribed circle CC and the true circular inner diameter D2 of the insulating coating material 46 is the conductor. The strand 41 may be smaller than the strand diameter D3.

(7) In the above embodiment, the configuration in which the cross-sectional shape of each conductor wire 41 in the extending orthogonal plane P is a circular shape has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the cross-sectional shape of each conductor wire 41 in the extending orthogonal plane P may be various polygonal shapes such as a quadrangular shape, a triangular shape, a pentagonal shape, a hexagonal shape, and an octagonal shape.

(8) In the above embodiment, all the covered conductors 4 are arranged in a line along the radial direction R in each slot 22 with the contact surfaces of the adjacent covered conductors 4 extending in the circumferential direction C. The configuration is described as an example. However, the embodiment of the present invention is not limited to this. That is, the cross-sectional shape and arrangement of the coated conductor 4 in the slot 22 can be determined as appropriate. For example, a configuration in which a plurality of covered conductors 4 are arranged in the slot 22 in a state where the contact surfaces of the adjacent covered conductors 4 are randomly oriented in various directions may be adopted. Or it is good also as a structure by which the some covering conducting wire 4 arrange | positioned in each slot 22 is arrange | positioned so that it may have the row | line | column along the radial direction R in the circumferential direction C. FIG.

(9) In the above-described embodiment, the example in which the stator core 2 having the semi-open slot 22 and the parallel teeth is to be wound by the covered conductive wire 4 has been described. However, the embodiment of the present invention is not limited to this. That is, the slot shape and the tooth shape can be set as appropriate. For example, the stator core 2 having the open type slot 22 may be wound. The open-type slot 22 is a slot 22 that does not have the circumferential protrusion 23b described in the above-described embodiment, and the width of the radial opening 22b is equal to the portion at the back of the slot. Further, the stator core 2 having parallel slots may be wound. The parallel slot is a slot 22 formed so that two inner wall surfaces 22a facing each other in the circumferential direction C are parallel to each other.

(10) In the above embodiment, the example in which the coated conductor according to the present invention is applied to the coil 3 of the stator 1 in the inner rotor type rotating electrical machine 100 has been described. However, the application target of the present invention is not limited to this. In other words, the coil 3 of the stator 1 in the outer rotor type rotating electrical machine 100 in which the rotor is disposed outside the radial direction R with respect to the stator 1 may be applied. Alternatively, the coil 3 of the stator 1 in the axial gap type rotating electrical machine 100 is not limited to the radial gap type rotating electrical machine 100, and can be applied. Furthermore, when the rotor 6 of the rotating electrical machine 100 includes a coil, the coil of the rotor 6 can be applied.

(11) Regarding other configurations as well, the embodiments disclosed herein are illustrative in all respects, and embodiments of the present invention are not limited thereto. In other words, configurations that are not described in the claims of the present application can be modified as appropriate without departing from the object of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a coated conductor for a coil of a rotating electrical machine and a rotating electrical machine configured using the coated conductor.

100: Rotating electric machine 1: Stator 2: Stator core (core)
3: Coil 4: Coated conductor 22: Slot 41: Conductor wire 42: Collected stranded wire 46: Insulation coating material A: Extension direction G: In-coating gap T1: Twisting pitch of a plurality of conductor strands in the assembled stranded wire T3: Twisting pitch of a plurality of aggregate strands

Claims (7)

A coated conductor for a coil of a rotating electrical machine,
Using a set twisted wire formed by twisting a plurality of conductor strands, a plurality of the set twisted wires are orthogonal to the extending direction of the set twisted wires in a state where the adjacent set twisted wires are in contact with each other. A coated conductor formed by arranging in parallel so that the center of gravity of a cross section is aligned in a line, and covering a plurality of the arranged twisted wires arranged in parallel with a flexible insulating coating material.   The coated conductor according to claim 1, wherein the two insulated wires are covered with the insulating coating material.   The coated conductor according to claim 1 or 2, wherein a twist pitch of the plurality of aggregate strands is larger than a twist pitch of the plurality of conductor strands in each of the aggregate strands.   The covered conducting wire according to any one of claims 1 to 3, wherein a plurality of the assembly strands are arranged in parallel in a substantially parallel state without twisting.   The coated conductor according to any one of claims 1 to 4, wherein the conductor wire is a bare wire.   The coated conductor according to any one of claims 1 to 5, wherein the insulating coating material is formed using a fluororesin. A rotating electrical machine comprising: a core having a plurality of slots; and a coil disposed in the slot and attached to the core,
The coated conductive wire constituting the coil is a set twisted wire formed by twisting a plurality of conductor strands, and a plurality of the set twisted wires in a state where the adjacent set twisted wires are in contact with each other. Arranged in parallel so that the center of gravity of the cross section perpendicular to the direction in which the stranded wires extend is aligned, and the periphery of the multiple stranded wires arranged in parallel is covered with a flexible insulating coating material Rotating electric machine.

Images