JP2011239535A - Coil, motor, and insulation material for core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil using windings with a semiconductive layer on their surfaces and capable of effectively reducing partial discharge between the windings.SOLUTION: A coil 4 comprises a core 10 having teeth 11, an insulator 12 covering the core 10, and windings 13 that are wound and aligned on the periphery of the teeth 11 through the insulator 12 and have a conductor 20, an insulating layer 21 covering the conductor 20 and a semiconductive layer 22 covering the insulating layer 21. Plural concavities 31-36 having a curvature radius equal to the radius of the windings 13 are formed on the surface of the insulator 12 covering the teeth 11 to align the windings 13. The plural concavities 31-36 includes a first concavity 33 and a second concavity 34, which is adjacent to the first concavity 33 and where the interval between the centers of the first concavity 33 and the second concavity 34 is less than the radius of the windings 13, and the winding 13 aligned at the first concavity 33 and the winding 13 aligned at the second concavity 34 touch each other.

Description

  The present invention relates to a coil, a motor, and a core insulating material.

  The following Patent Document 1 discloses a coil using a winding having a structure having a conductor, an insulating layer covering the conductor, and a semiconductive layer covering the insulating layer. By using a winding having a semiconductive layer on the surface in this way, partial discharge between the windings is suppressed as compared with a coil using a normal winding that does not have a semiconductive layer. A coil suitable for the application can be obtained.

Japanese Patent No. 3077782

  FIG. 12 is a graph showing the results of analyzing the relationship between the gap dimension (winding interval) between adjacent windings and the electric field strength between the windings, with respect to the winding having a semiconductive layer on the surface. As can be seen from FIG. 12, in the region where the winding interval is around 0.002 mm, the electric field strength is extremely larger than in the other regions. Therefore, in a coil using a winding having a semiconducting layer on the surface, when a gap of about 0.002 mm is generated between adjacent windings, the electric field strength at that point becomes high, and the partial discharge between the windings Is likely to occur.

  The present invention has been made in view of such circumstances, and a coil, a motor, and a coil capable of effectively suppressing partial discharge between windings while using a winding having a semiconductive layer on the surface. It aims at obtaining the insulating material for coils.

  The coil according to the first aspect of the present invention is a conductor having a core having a tooth portion, an insulating material covering the core, and being wound on the outer periphery of the tooth portion via the insulating material, A winding having an insulating layer that covers the conductor and a semiconductive layer that covers the insulating layer, and the winding is disposed on a surface of the insulating material that covers the teeth portion. A plurality of recesses having a radius of curvature equal to a radius of the winding, and the plurality of recesses are adjacent to the first recess, the first recess, and the first recess. A second recess having a center interval less than the diameter of the winding, and the winding disposed in the first recess and the winding disposed in the second recess contact each other. It is a feature.

  According to the coil according to the first aspect, a plurality of recesses having a radius of curvature equal to the radius of the winding for arranging the winding are formed on the surface of the insulating material covering the tooth portion. The plurality of recesses include a first recess and a second recess adjacent to the first recess and having a center distance from the first recess less than the diameter of the winding. And since the coil | winding arrange | positioned at a 1st recessed part and the coil | winding arrange | positioned at a 2nd recessed part mutually contact, the semiconductive layers of the mutually contacting coil | winding can be set to equipotential. As a result, partial discharge between windings can be effectively suppressed.

  The coil according to the second aspect of the present invention is the coil according to the first aspect, in particular, the plurality of recesses are adjacent to the first recess on the side opposite to the second recess, and the first recess And the third recess is larger than the diameter of the winding and is adjacent to the second recess on the opposite side of the first recess, and the center spacing between the second recess is larger than the diameter of the winding. A fourth recess is further included, between the winding disposed in the first recess and the winding disposed in the third recess, and the winding disposed in the second recess. A predetermined gap is formed between each of the windings disposed in the fourth recess.

  According to the coil which concerns on a 2nd aspect, it arrange | positions between the coil | winding arrange | positioned at a 1st recessed part and the coil | winding arrange | positioned at a 3rd recessed part, and the coil | winding arrange | positioned at a 2nd recessed part, and a 4th recessed part. A predetermined gap is formed between each winding. Therefore, reliable aligned winding can be realized from the lower layer to the upper layer of the laminated structure of the windings.

  The coil according to the third aspect of the present invention is the coil according to the second aspect, in particular, the structure having the first to fourth recesses on the surface of the insulating material is in the length direction of the tooth portion. It is characterized by being repeatedly formed along.

  According to the coil which concerns on a 3rd aspect, the structure which has a 1st thru | or 4th recessed part is repeatedly formed along the length direction of a teeth part. Therefore, it is possible to realize reliable aligned winding in each layer of the laminated structure of the windings.

  The coil according to the fourth aspect of the present invention is characterized in that, in the coil according to any one of the first to third aspects, the winding is a single wire winding.

  According to the coil which concerns on a 4th aspect, in the coil using a single wire | winding, it becomes possible to suppress the partial discharge between windings effectively.

  The coil according to the fifth aspect of the present invention is the coil according to any one of the first to third aspects, in particular, the winding includes a first winding and a second winding that form a pair at an equal potential. And the first winding is disposed in the first recess, and the second winding is disposed in the second recess.

  According to the coil according to the fifth aspect, in the coil using the winding including the first winding and the second winding that are paired at the same potential, the partial discharge between the windings can be effectively suppressed. It becomes possible.

  The coil according to a sixth aspect of the present invention is the coil according to any one of the first to fifth aspects, and in particular, the winding electrically connects the conductor and the semiconductive layer to each other at an end thereof. It is characterized in that an insulation process is performed to insulate it.

  According to the coil according to the sixth aspect, the winding is subjected to an insulation process at its end to electrically insulate the conductor and the semiconductive layer from each other. Therefore, it is possible to avoid in advance the occurrence of partial discharge between the conductor and the semiconductive layer at the end of the winding.

  The coil according to the seventh aspect of the present invention is the coil according to any one of the first to sixth aspects, and in particular, the coil is at least on the input side among a plurality of coils connected in series within the same phase. The coil is the closest to the coil.

  According to the coil which concerns on a 7th aspect, a coil is a coil nearest to the input side at least among the several coils connected in series within the same phase. Since the coil closest to the input side is easily affected by the input voltage, when a high voltage is input, the voltage at both ends of the coil also increases and partial discharge between the windings is likely to occur. Therefore, by adopting a structure in which partial discharge is less likely to occur by applying the present invention to at least the coil closest to the input side among a plurality of coils connected in series in the same phase, a portion between windings It becomes possible to suppress discharge in advance.

  The coil according to the eighth aspect of the present invention is characterized in that the coil according to the seventh aspect further includes an insulating member for electrically insulating a plurality of coils having different phases. It is.

  According to the coil which concerns on an 8th aspect, between several coils from which a phase differs is electrically insulated by an insulating member. Therefore, it is possible to appropriately insulate the phases having a higher voltage than the inside by the insulating member.

  The motor which concerns on the 9th aspect of this invention is equipped with the stator which has the coil which concerns on a 1st aspect, and a rotor, It is characterized by the above-mentioned.

  According to the motor of the ninth aspect, since the stator has the coil according to the first aspect, the winding for disposing the windings on the surface of the insulating material covering the teeth portion. A plurality of recesses having a radius of curvature equal to the radius of the line is formed. The plurality of recesses are adjacent to the first recess and the first recess, and the center interval between the first recess is less than the diameter of the winding. A second recess. And since the coil | winding arrange | positioned at a 1st recessed part and the coil | winding arrange | positioned at a 2nd recessed part mutually contact, the semiconductive layers of the mutually contacting coil | winding can be set to equipotential. As a result, partial discharge between windings can be effectively suppressed.

  The insulating material for a core according to the tenth aspect of the present invention has a conductor, an insulating layer covering the conductor, and a winding having a semiconductive layer covering the insulating layer aligned on the outer periphery of the tooth portion of the core. In order to wind the coil, the core insulating material for covering the core, the winding for disposing the winding on the surface of the insulating material covering the tooth portion, is provided. A plurality of recesses having a radius of curvature equal to the radius of a line is formed, and the plurality of recesses are adjacent to the first recess and the first recess, and a center interval between the first recess and the winding is the winding. And a second recess having a diameter less than that of the second recess.

  According to the core insulating material according to the ninth aspect, the surface of the insulating material covering the tooth portion has a plurality of curvature radii equal to the radius of the winding for disposing the winding. A recess is formed, and the plurality of recesses include a first recess and a second recess adjacent to the first recess and having a center distance between the first recess and less than the diameter of the winding. Therefore, the winding disposed in the first recess and the winding disposed in the second recess can be brought into contact with each other. As a result, the semiconductive layers of the windings in contact with each other can be set to the same potential, so that partial discharge between the windings can be effectively suppressed.

  According to the present invention, it is possible to obtain a coil, a motor, and a core insulating material capable of effectively suppressing partial discharge between windings while using a winding having a semiconductive layer on the surface. .

It is a figure showing typically the whole motor composition concerning an embodiment of the invention. It is a figure which shows the structure of one coil typically. It is sectional drawing which shows the structure of a coil | winding. It is a figure which shows a part of structure of an insulator. It is a figure which shows the 1st example of the process of winding a coil | winding on an insulator. It is a figure which shows the 1st example of the process of winding a coil | winding on an insulator. It is a figure which shows the 2nd example of the process of winding a coil | winding on an insulator. It is a figure which shows the other example of the laminated structure of a coil | winding. It is a figure which shows the 1st example of the edge part process given to the edge part of a coil | winding. It is a figure which shows the 2nd example of the edge part process given to the edge part of a coil | winding. It is a figure which shows the usage example of a motor. It is a graph which shows the result of having analyzed the relationship between the clearance gap between adjacent windings, and the electric field strength between the said windings about the winding which has a semiconductive layer on the surface.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the element which attached | subjected the same code | symbol in different drawing shall show the same or corresponding element.

  FIG. 1 is a diagram schematically showing an overall configuration of a motor 1 according to an embodiment of the present invention. As shown in FIG. 1, the motor 1 includes an annular stator 3 and a rotor 2 disposed in the annular ring of the stator 3. The stator 3 has a structure (so-called divided stator) in which a plurality of divided coils 4 are arranged side by side along a ring.

  FIG. 2 is a diagram schematically showing the structure of one coil 4. As shown in FIG. 2, the coil 4 is disposed on a part of the surface of the core 10 including the tooth part 11 and the core 10 having the quadrangular columnar teeth part 11, thereby insulating the core 10 partially. The insulating insulator (insulating material) 12 and the winding 13 wound in alignment on the outer periphery of the tooth portion 11 via the insulator 12 are configured.

FIG. 3 is a cross-sectional view showing the structure of the winding 13. As shown in FIG. 3, the winding 13 has a circular cross-sectional structure, and includes a central conductor 20, an insulating layer 21 that covers the conductor 20, and a semiconductive layer 22 that covers the insulating layer 21. It has a structure. The material of the conductor 20 is, for example, copper. The material of the insulating layer 21 is, for example, polyamideimide. The material of the semiconductive layer 22 is, for example, polyamideimide in which a conductive material such as carbon black powder is kneaded. However, the material of each layer is not limited to this example. The diameter of the conductor 20 is, for example, 0.8 mm, the thickness of the insulating layer 21 is, for example, 0.044 mm, and the thickness of the semiconductive layer 22 is, for example, 0.005 mm. However, the dimensions of each layer are not limited to this example. The surface resistivity of the semiconductive layer 22 is set to be less than 10 ⁶ Ω / □ (preferably less than 10 ⁴ Ω / □), and thus a high partial discharge start voltage (less than 10 ⁴ Ω / □ is 3800 Vp or more) Is realized.

  FIG. 4 is a diagram showing a part of the structure of the insulator 12. As shown in FIG. 4, a plurality of concave portions 31 to 36 for arranging and arranging the windings 13 are formed on the surface of the insulator 12. The curvature radii of the recesses 31 to 36 are set equal to the radius of the winding 13. In addition, the recessed parts 31-36 do not necessarily need to be formed corresponding to the outer peripheral whole region of the square pillar-shaped teeth part 11, and should just be formed corresponding to the corner | angular part of at least four square pillars.

  Referring to FIG. 4, the center interval L1 between the recess 31 and the recess 32, the center interval L1 between the recess 33 and the recess 34, and the center interval L1 between the recess 35 and the recess 36 are less than the diameter of the winding 13. (For example, 99% of the diameter). Further, the center interval L2 between the recess 32 and the recess 33 and the center interval L2 between the recess 34 and the recess 35 are set to values larger than the diameter of the winding 13 (for example, 105% of the diameter). The depths of the recesses 31, 34, and 35 are set to be shallower than the depths of the recesses 32, 33, and 36. In the insulator 12, the structural units are repeatedly formed along the length direction of the tooth portion 12 with the concave portions 32 to 35 as structural units.

  5 and 6 are diagrams showing a first example of a process of winding the winding wire 13 on the insulator 12. FIG. In the example shown in FIGS. 5 and 6, the winding 13 is constituted by a single winding.

  Referring to FIG. 5, in the first layer L <b> 1 that is the innermost layer of the laminated structure of the windings, the windings 13 are sequentially wound according to the recesses 31 to 36. Specifically, the first turn A1 of the winding 13 is wound according to the recess 31, the second turn A2 is then wound according to the recess 32, and the same operation is repeated for the third to fifth turns A3 to A5. After that, the sixth turn A6 is wound according to the recess 36. As shown in FIG. 5, the first turn A1 and the second turn A2 are in contact with each other, the third turn A3 and the fourth turn A4 are in contact with each other, and the fifth turn A5 and the sixth turn A6 are in contact with each other. is doing. In addition, predetermined gaps are formed between the second turn A2 and the third turn A3 and between the fourth turn A4 and the fifth turn A5, respectively.

  Next, referring to FIG. 6, in the second layer L2, which is an outer layer of the first layer L1, the windings 13 are wound in order according to the windings 13 already wound around the first layer L1. Specifically, the seventh turn A7 is wound according to the fifth turn A5 and the sixth turn A6, and then the eighth turn A8 is wound according to the fourth turn A4 and the fifth turn A5, and the ninth and tenth turns. After the same operation is repeated for A9 and A10, the eleventh turn A11 is wound according to the first turn A1 and the second turn A2. In addition, although illustration is abbreviate | omitted, the coil | winding 13 is wound in order according to the coil | winding 13 already wound by the lower layer similarly after the 3rd layer.

  Further, as shown in FIG. 6, the winding 13 in the second layer L2 is in contact with the winding 13 in the first layer L1. For example, the eighth turn A8 is in contact with the fourth turn A4 and the fifth turn A5, and the tenth turn A10 is in contact with the second turn A2 and the third turn A3.

  FIG. 7 is a diagram illustrating a second example of the process of winding the winding wire 13 on the insulator 12. In the example shown in FIG. 7, the winding 13 is configured to include two windings (first winding A and second winding B) that are paired with an equal potential.

  Referring to FIG. 7, in the first layer L <b> 1 that is the innermost layer of the laminated structure of the windings, the first winding A and the second winding B are sequentially wound according to the recesses 31 to 36. Specifically, the first turn B1 of the second winding B is wound according to the recess 31, the second turn A2 of the first winding A is then wound according to the recess 32, and then the second winding B The second turn B2 is wound according to the recess 33, then the third turn A3 of the first winding A is wound according to the recess 34, and then the third turn B3 of the second winding B is wound according to the recess 35 Then, the fourth turn A4 of the first winding A is wound according to the recess 36. As shown in FIG. 7, the first turn B1 of the second winding B and the second turn A2 of the first winding A are in contact with each other, and the second turn B2 and the first winding A of the second winding B are in contact with each other. The third turn A3 is in contact with each other, and the third turn B3 of the second winding B and the fourth turn A4 of the first winding A are in contact with each other. Also, between the second turn A2 of the first winding A and the second turn B2 of the second winding B, and the third turn A3 of the first winding A and the third turn B3 of the second winding B, A predetermined gap is formed between each. In addition, although illustration is abbreviate | omitted, the 1st coil | winding A and the 2nd coil | winding B are wound in order according to the coil | winding 13 already wound by the lower layer similarly after the 2nd layer L2.

  FIG. 8 is a diagram illustrating another example of the laminated structure of the windings 13. As shown in FIG. 8, a plurality of concave portions 40 for arranging the windings 13 in alignment are formed on the surface of the insulator 12. In addition, the recessed part 40 does not necessarily need to be formed corresponding to the outer peripheral whole region of the square pillar-shaped teeth part 11, and should just be formed corresponding to the corner | angular part of at least four square pillars. The center interval between the recesses 40 adjacent to each other is set to a value larger than the diameter of the winding 13 (for example, 103% of the diameter). As shown in FIG. 8 with numerals in the figure of the winding 13, the winding 13 is wound in an obliquely upward direction (so-called diagonal winding). Thus, for example, the second turn of the winding 13 (the winding 13 with the numeral “2”) contacts the first turn (the winding 13 with the numeral “1”), and the first turn of the winding 13 Four turns (winding 13 with the number “4”) are in contact with the third turn (winding 13 with the number “3”). The fourth turn also contacts the first turn, the fifth turn (winding 13 with the number “5”), and the ninth turn (winding 13 with the number “9”). Note that the windings 13 belonging to the same layer of the laminated structure (for example, the first turn and the third turn) do not contact each other.

  FIG. 9 is a diagram illustrating a first example of the end processing applied to the end of the winding 13. At the end of the winding 13, the conductor 20 is exposed by peeling off the semiconductive layer 22 and the insulating layer 21. At this time, the region where the insulating layer 21 is exposed by peeling only the semiconductive layer 22. Is left a predetermined distance between the conductor 20 and the semiconductive layer 22. Thus, the conductor 20 and the semiconductive layer 22 are electrically separated from each other by sandwiching the region therebetween.

  FIG. 10 is a diagram illustrating a second example of end processing applied to the end of the winding 13. At the end of the winding 13, the conductor 20 is exposed by peeling off the semiconductive layer 22 and the insulating layer 21. At this time, a predetermined region including the tip of the semiconductive layer 22 and a part of the conductor 20 is exposed. Is sealed with a sealing material 50 such as an insulating resin. Thereby, the conductor 20 and the semiconductive layer 22 are electrically separated by sandwiching the sealing material 50 therebetween.

  FIG. 11 is a diagram illustrating a usage example of the motor 1. The serial connection body consisting of a plurality of coils U1 to U4, the serial connection body consisting of a plurality of coils V1 to V4, and the serial connection body consisting of a plurality of coils W1 to W4 are the U phase, V phase, and W phase of the inverter 60. Are connected to each. The coils U1, V1, and W1 are coils that are closest to the inverter 60 on the input side among the serially connected bodies. The structure of the coil 4 described above is applied to at least the coils U1, V1, and W1. However, you may apply to all the coils of each series connection body.

  Also, between the U-phase coils U1 to U4 and the V-phase coils V1 to V4, between the V-phase coils V1 to V4 and the W-phase coils W1 to W4, and between the W-phase coils W1 to W4 and U The phase coils U1 to U4 are electrically insulated from each other by a predetermined insulating member (not shown) including interphase insulating paper and an insulating material such as enamel. The thickness of the insulating member is set according to the assumed interphase voltage. Thereby, the phase which becomes a higher voltage than the inside can be insulated appropriately by the said insulating member. Further, as shown in FIG. 2, the winding 13 and the ground potential (core 10) are electrically insulated from each other by the insulator 12. The thickness of the insulator 12 is set according to the assumed ground voltage. Accordingly, the insulator 12 can appropriately insulate the ground that has a higher voltage than that in the phase.

  As shown in FIG. 5, according to the coil 4 according to the present embodiment, the winding 13 is arranged on the surface of the insulator 12 that covers the teeth portion 11. A plurality of recesses 31 to 36 having a radius of curvature equal to the radius is formed. The plurality of recesses 31 to 36 are adjacent to the first recess 33 and the first recess 33, and the center distance between the first recess 33. And a second recess 34 that is less than the diameter of the winding 13. And since the coil | winding 13 arrange | positioned at the 1st recessed part 33 and the coil | winding 13 arrange | positioned at the 2nd recessed part 34 mutually contact, the semiconductive layers 22 of the coil | winding 13 which mutually contact are set to equipotential. be able to. As a result, since partial discharge between the windings 13 can be effectively suppressed, a coil suitable for high-voltage equipment applications such as an electric vehicle motor and a hybrid vehicle motor can be obtained.

  Further, as shown in FIG. 5, according to the coil 4 according to the present embodiment, between the winding 13 disposed in the first recess 33 and the winding 13 disposed in the third recess 32, and A predetermined gap is formed between the winding 13 disposed in the second recess 34 and the winding 13 disposed in the fourth recess 35. Accordingly, it is possible to realize reliable aligned winding from the lower layer to the upper layer of the laminated structure of the windings 13.

  Further, as shown in FIG. 5, according to the coil 4 according to the present embodiment, the structure having the first to fourth recesses 32 to 35 is repeatedly formed along the length direction of the teeth portion 11. Yes. Therefore, it is possible to realize reliable aligned winding in each layer of the laminated structure of the windings 13.

  Further, as shown in FIG. 5, according to the coil 4 according to the present embodiment, in the coil using the single wire winding 13, it is possible to effectively suppress the partial discharge between the windings 13. Become.

  Further, as shown in FIG. 7, according to the coil 4 according to the present embodiment, in the coil using the winding 13 including the first winding A and the second winding B that form a pair at the same potential, It is possible to effectively suppress the partial discharge between the windings 13.

  Moreover, as shown in FIGS. 9 and 10, according to the coil 4 according to the present embodiment, the winding 13 electrically insulates the conductor 20 and the semiconductive layer 22 from each other at the end portion. Insulation treatment is applied. Therefore, it is possible to avoid in advance the occurrence of partial discharge between the conductor 20 and the semiconductive layer 22 at the end of the winding 13.

  Moreover, as shown in FIG. 11, the coil 4 according to the present embodiment is the most at least on the input side among the plurality of coils U1 to U4, V1 to V4, and W1 to W4 connected in series within the same phase. Applies to close coils U1, V1, W1. Since the coils U1, V1, and W1 closest to the input side are easily affected by the input voltage, when a high voltage is input, the voltage between both ends of the coils U1, V1, and W1 also increases and the portion between the windings 13 Discharge tends to occur. Therefore, among the plurality of coils U1 to U4, V1 to V4, and W1 to W4 connected in series in the same phase, the coil 4 is applied to at least the coils U1, V1, and W1 that are closest to the input side. By adopting a structure in which discharge is difficult to occur, partial discharge between the windings 13 can be suppressed in advance.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of claims for patent, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims for patent.

DESCRIPTION OF SYMBOLS 1 Motor 2 Rotor 3 Stator 4 Coil 10 Core 11 Teeth part 12 Insulator 13 Winding 20 Conductor 21 Insulating layer 22 Semiconductive layer 31-36 Recessed part

Claims (10)

A core having a teeth portion;
An insulating material covering the core;
A winding having a conductor, an insulating layer that covers the conductor, and a semiconductive layer that covers the insulating layer, wound in alignment on the outer periphery of the teeth portion via the insulating material;
With
A plurality of recesses having a radius of curvature equal to the radius of the winding for arranging the winding is formed on the surface of the insulating material in a portion covering the tooth portion,
In the plurality of recesses,
A first recess;
A second recess adjacent to the first recess and having a center distance from the first recess less than the diameter of the winding;
Contains
A coil in which the winding disposed in the first recess and the winding disposed in the second recess contact each other. In the plurality of recesses,
A third recess adjacent to the first recess on the opposite side of the second recess and having a center distance from the first recess greater than the diameter of the winding;
A fourth recess adjacent to the second recess on the opposite side of the first recess and having a center distance from the second recess greater than the diameter of the winding;
Is further included,
The winding disposed between the winding disposed in the first recess and the winding disposed in the third recess and between the winding disposed in the second recess and the fourth recess. The coil according to claim 1, wherein a predetermined gap is formed between each of the wires.   The coil according to claim 2, wherein a structure having the first to fourth recesses is repeatedly formed on a surface of the insulating material along a length direction of the tooth portion.   The coil according to claim 1, wherein the winding is a single wire. The winding includes a first winding and a second winding that are paired at an equipotential;
The coil according to claim 1, wherein the first winding is disposed in the first recess, and the second winding is disposed in the second recess.   The coil according to any one of claims 1 to 5, wherein an insulating treatment for electrically insulating the conductor and the semiconductive layer from each other is performed at an end portion of the winding.   The said coil is a coil as described in any one of Claims 1-6 which is a coil nearest to an input side at least among the several coils connected in series within the same phase.   The coil according to claim 7, further comprising an insulating member for electrically insulating a plurality of coils having different phases. A stator having the coil of claim 1;
A rotor,
Motor with. For a core covering a core in order to wind a conductor, an insulating layer covering the conductor, and a winding having a semiconductive layer covering the insulating layer on the outer periphery of a core tooth portion An insulating material,
A plurality of recesses having a radius of curvature equal to the radius of the winding for arranging the winding is formed on the surface of the insulating material in a portion covering the tooth portion,
In the plurality of recesses,
A first recess;
A second recess adjacent to the first recess and having a center distance from the first recess less than the diameter of the winding;
Contains core insulation.

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