JP6863711B2 - Slot liner and its manufacturing method - Google Patents

Description

The present invention relates to a slot liner, particularly a slot liner that is fitted into a slot of a core material constituting a motor of a hybrid car, an electric vehicle, or the like and used to secure electrical insulation between the core and a coil, and a method for manufacturing the same.

A stator of a rotary electric machine such as a motor or a generator is composed of an annular stator core having a plurality of slots in the circumferential direction of the inner peripheral surface and a coil wound around the slots, and between the stator core and the coil. , An insulating sheet is inserted to ensure electrical insulation.
Conventionally, such an insulating sheet has been used as a resin film such as polymetaphenylene isophthalamide (hereinafter referred to as meta-aramid) fibrid and aramid paper (for example, Nomex (registered trademark)) composed of fibers and polyethylene terephthalate. , An aramid-resin film laminate obtained by laminating the aramid paper and the resin film, and the like are used.
Generally, the insulating sheet is slotted by folding both ends and bending the folded portion outward into a substantially U shape, for example, as shown in FIG. 3 of Japanese Patent Application Laid-Open No. 60-162951. A liner is formed and then inserted into the slot. At this time, the folded portion exists in a state of protruding in the axial direction from the end face of the core material, and the tip of the folded portion comes into contact with the end surface of the core material so that the slot liner does not shift in the slot axial direction.
However, since the folded-back portion protrudes from the core material, the folded-back portion is likely to be deformed or damaged when the coil is inserted and wound, and is easily damaged by burrs at the slot end. There is.
As a slot liner for solving these problems, Japanese Patent Application Laid-Open No. 60-162951 proposes a slot liner in which the folded portion is further folded outward in half to reinforce the folded portion. In the fourth embodiment of Japanese Patent Publication No. -288405, a slot liner in which the bent portion and the body portion are brought into close contact with each other by a press or the like is proposed, although it is not for the purpose of reinforcement.
Although these techniques do improve the resistance to deformation and breakage of the folded portion, in each case, the folded portion protrudes in the axial direction from the end face of the core material, so that the axial length of the core material becomes longer. It is not preferable as a rotary electric machine mounted in a limited space such as an electric motor used for driving a vehicle such as a hybrid vehicle, and a slot liner that contributes to further miniaturization of the rotary electric machine has been desired.

Jitsukaisho 60-162951 Japanese Unexamined Patent Publication No. 2010-288405

An object of the present invention is to provide a slot liner and a method for manufacturing the same, which bring about miniaturization, high efficiency, and high output of rotary electric machines such as motors and generators.

In view of this situation, the present inventor has completed the present invention as a result of diligent studies to obtain a slot liner that brings about miniaturization, high efficiency, and high output of rotary electric machines such as motors and generators. ..
That is, one embodiment of the present invention is a slot liner mounted in a slot formed on the inner peripheral surface of the stator core.
Formed from a single insulating sheet,
Provided is a slot liner having a body portion that covers the inner surface of the slot and a collar portion provided at at least one of both ends in the longitudinal direction of the body portion.
When mounted on the stator core, the collar may be in contact with the axial end face of the stator core.
The insulating sheet was formed by melt-extruding a resin onto an aramid paper made of aramid fibrid and aramid short fibers, an aramid-resin film laminate obtained by laminating the aramid paper and a resin film, or the aramid paper. You may choose from any of the sheets.
In another embodiment of the present invention, the inner surface of the body portion of the insulating sheet is sandwiched and fixed by a substantially U-shaped heated mold having the shape of the inner peripheral surface of the slot, and then the edge of the insulating sheet protruding from the mold is fixed. While stretching the portion, it is bent outward so as to be substantially perpendicular to the body portion, and then the bent insulating sheet is sandwiched between the mold installed on the end side and the side surface portion of the substantially U-shaped mold. The present invention provides a method for manufacturing a slot liner, which comprises fixing and forming a collar portion.
Another embodiment of the present invention provides a motor comprising a stator core in which a coil is wound in a slot in which the slot liner is mounted on an inner peripheral surface.
Another embodiment of the present invention provides a generator characterized in that a stator core in which a coil is wound is provided in a slot in which the slot liner is mounted on an inner peripheral surface.
Another embodiment of the present invention provides a rotary electric machine characterized in that a stator core in which a coil is wound is provided in a slot in which the slot liner is mounted on an inner peripheral surface.

It is a perspective view which shows the slot liner of one Embodiment of this invention. It is a front view of the insulation sheet used in one Embodiment of this invention. It is a perspective view when the insulating sheet of FIG. 2 is bent along the inner peripheral surface of a slot. It is a perspective view which shows the slot liner of another embodiment of this invention.

Hereinafter, the slot liner of the preferred embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not particularly limited thereto. FIG. 1 is a perspective view of a slot liner according to a preferred embodiment of the present invention.
The slot liner 1 is formed of a single insulating sheet, and has a substantially U-shaped body portion 2 covering the inner surface of the slot of the stator core and a semicircular shape provided at both ends in the axial direction of the substantially U-shape and extending outward. The collar part 3 is provided. The flange portion of the present embodiment means a flange-shaped portion formed by bending one end of the insulating sheet in a direction substantially perpendicular to the body portion 2. By adopting such a structure for forming the flange portion, the length of the slot liner in the axial direction of the stator core can be shortened as compared with the case where the folded portion is formed at the end portion. Further, by using the folded portion as a flange portion, it is possible to suppress deformation and damage that occur in the folded portion.
In addition, in this specification, "substantially vertical / substantially right angle" means that it is 90 ° ± 5 °, preferably 90 ° ± 3 °, and more preferably 90 ° ± 1 °.

FIG. 4 shows a perspective view of a slot liner 5 according to an embodiment of the present invention, which is different from FIG. 1, and in this slot liner 5, a cuff portion 8 is formed in place of one of the collar portions 3. .. When mounted on the stator core, the cuff end 8a is brought into contact with the axial end surface of the stator core in order to prevent misalignment during coil winding. As a result, although the cuff portion 8 protrudes in the axial direction from the stator core and the axial length of the core becomes longer, the cuff portion 8 can be easily fitted into the slot by inserting the cuff portion 8 from the slot side end portion. In addition, in this specification, a "cuff part" refers to a part which is provided at the axial end of the body part of a slot liner 5 and is bent outward like a "cuff".
The slot liner shown in FIGS. 1 and 4 is used by being fitted into a slot of the stator core. At this time, since the flange portion 3 exists in contact with the end face of the stator core, it is possible to prevent the slot liner from being displaced when the coil is wound around the slot.

(Aramid)
In the present invention, the aramid means a linear polymer compound in which 60% or more of the amide bonds are directly bonded to the aromatic ring. Examples of such an aramid include polymetaphenylene isophthalamide and its copolymer, polyparaphenylene terephthalamide and its copolymer, and copolyparaphenylene 3,4'-diphenyl ether terephthalamide. These aramids are industrially produced by, for example, a solution polymerization method by a condensation reaction with an aromatic acid dichloride and an aromatic diamine, a two-step interfacial polymerization method, etc., and can be obtained as commercial products. , Not limited to this. Among these aramids, polymetaphenylene isophthalamide is preferably used because it has properties such as good molding processability, flame retardancy, and heat resistance.

(Aramid Five Brid)
In the present invention, the aramid fibrid is a film-like fine particle composed of aramid, and is sometimes referred to as aramid pulp. As the production method, for example, the methods described in Tokukousho 35-11851, Tokukousho 37-5732, and the like are exemplified. Since aramid fibrid has paper-making properties like ordinary wood pulp, it can be formed into a sheet by a paper machine after being dispersed in water. In this case, a so-called beating process can be performed for the purpose of maintaining the quality suitable for papermaking. This beating process can be performed by a disc refiner, beater, or other papermaking raw material processing device that exerts a mechanical cutting action. In this operation, the morphological change of the fibrid can be monitored at the drainage degree (freeness) specified in JIS P8121. In the present invention, the degree of drainage of the aramid fibrid after the beating treatment is preferably in the range of 10 to ^{300 cm 3 (Canadian standard freeness).} A fibrid with a drainage degree greater than this range may reduce the strength of the sheet formed from it. On the other hand, ^{if it is attempted to obtain a drainage degree smaller than 10 cm 3} , the utilization efficiency of the mechanical power to be input becomes small, the amount of processing per unit time is often small, and the binder becomes finer. Since it progresses too much, it tends to cause a deterioration of the so-called binder function.

(Aramid short fiber)
In the present invention, the aramid short fiber is a fiber made from aramid cut into a predetermined length, and examples of such fiber include "Conex (registered trademark)" of Teijin Limited. Examples include "Technora (registered trademark)", "Nomex (registered trademark)" by DuPont, "Kevlar (registered trademark)", and "Twaron (registered trademark)" by Teijin Aramid, but are limited to these. is not it.
Aramid short fibers can preferably have a fineness in the range of 0.05 dtex or more and less than 25 dtex. Fibers with a fineness of less than 0.05 dtex tend to cause agglomeration in the production by a wet method (described later), and fibers with a fineness of 25 dtex or more have a fiber diameter that becomes too large, resulting in a decrease in aspect ratio and mechanical reinforcement. There is a risk of reduced effectiveness and poor uniformity of the aramid paper.
The length of the aramid short fibers can be selected from the range of 1 mm or more and less than 25 mm, preferably 2 to 12 mm. If the length of the short fibers is smaller than 1 mm, the mechanical properties of the aramid paper deteriorate, while if the short fibers are 25 mm or more, "entanglement" and "binding" occur during the production of the aramid paper by the wet method described later. It is easy to cause defects.

(Aramid paper)
In the present invention, the aramid paper is a sheet-like material mainly composed of the above-mentioned aramid fibrid and aramid short fibers, and generally has a thickness in the range of 20 μm to 1000 μm. Further aramid paper generally has a basis weight in the range of ^{10g / m 2 ~1000g / m 2} . Here, the mixing ratio of the aramid fibrid and the aramid short fiber can be arbitrary, but the ratio (mass ratio) of the aramid fibrid / aramid short fiber is preferably 1/9 to 9/1, more preferably. It is preferably 2/8 to 8/2, but is not limited to this range.
Aramid paper is generally produced by the method of mixing the above-mentioned aramid fibrid and aramid short fibers and then forming a sheet. Specifically, for example, a method in which the above-mentioned aramid fibrid and aramid short fibers are dry-blended and then a sheet is formed using an air flow. After the aramid fibrid and aramid short fibers are dispersed and mixed in a liquid medium, the liquid permeates. A method of discharging on a sex support, for example, a net or a belt to form a sheet, removing the liquid and drying, etc. can be applied, but among these, a so-called wet fabrication method using water as a medium is preferably selected. ..

In the wet papermaking method, an aqueous slurry containing at least aramid fibrid and aramid short fibers is sent to a paper machine to disperse it, and then dehydrated, squeezed and dried to be wound up as a sheet. Is common. As the paper machine, a long net paper machine, a circular net paper machine, an inclined paper machine, a combination paper machine combining these, and the like are used. In the case of production with a combination paper machine, a composite sheet composed of a plurality of paper layers can be obtained by forming a sheet of slurries having different mixing ratios and coalescing them. Additives such as dispersibility improvers, defoamers, and paper strength enhancers are used during papermaking as needed.
The density and mechanical strength of the aramid paper obtained as described above can be improved by heat-pressing the aramid paper at high temperature and high pressure between a pair of rolls. The conditions for heat and pressure processing can be exemplified in the range of a temperature of 100 ° C. to 400 ° C. and a linear pressure of 50 to 400 kg / cm when a metal roll is used, but the conditions are not limited thereto. It is also possible to stack multiple aramid papers during thermal pressure. Further, the above heating and pressurizing processing can be performed a plurality of times in any order.

(Insulating sheet)
In the present invention, the insulating sheet means a sheet having electrical insulation. The insulating sheet preferably has ^{a volume resistivity of 1 × 10 10} to 1 × 10 ²⁰ Ω · cm, and more preferably has a volume resistivity of 1 × 10 ¹² to 1 × 10 ²⁰ Ω · cm. Examples thereof include the aramid paper alone, the aramid-resin film laminate obtained by laminating the aramid paper and the resin film and adhering them with an adhesive or the like, or a sheet formed by melt-extruding a resin onto the aramid paper.
Examples of the resin film used for the aramid-resin film laminate include polyethylene terephthalate, polyethylene naphthalate, polyamide, aromatic polyamide, polyimide, polytetrafluoroethylene, and polyphenylene sulfide. These may be used alone, or a resin or a copolymer in which two or more kinds are blended may be used. Further, as the adhesive used for laminating the aramid paper, any adhesive usually used in the technical field may be used, and for example, epoxy-based, acrylic-based, phenol-based, urethane-based, and silicon-based adhesives may be used. , Polyester-based, amide-based and other adhesives, but are not limited thereto.

In the case of laminating the aramid paper and the above film with an adhesive, the film is usually stretched, and when the slot liner is manufactured by the molding method described later, the aramid-resin film laminate is likely to be deformed due to shrinkage. When it is necessary to suppress even a little, a method in which a film in which a polymer is melt-formed in advance and the aramid paper are superposed and heated and pressed to melt-impregnate the polymer in the aramid paper, or a resin is melt-extruded onto the aramid paper. A sheet in which aramid paper is directly laminated with a resin without using an adhesive is preferably used by a method of heat-sealing or the like.
The number of layers of the laminate can be appropriately selected according to the application and purpose of the laminate, but if aramid paper is arranged on at least one surface layer, the slipperiness will be good. Therefore, in the motor, for example, in the slot provided in the stator core as described above. This is preferable because it has the effect of facilitating the insertion of a new slot liner. For example, an epoxy group-containing phenoxy having an epoxy group in the molecule and an aromatic polyamide resin produced by a method of melt-extruding a resin onto aramid paper and heat-sealing as described in JP-A-2006-321183. Examples thereof include a two-layer laminated sheet of polymer and aramid paper, which is composed of a resin and has an epoxy group-containing phenoxy resin ratio of 30 to 50% by mass, and a three-layer laminated sheet of aramid paper, the polymer and aramid paper. It is not limited to these.
The thickness of the insulating sheet can be appropriately selected according to the size of the stator core, the shape of the slot, the application and the purpose, and can be selected as long as there is no problem in bending workability. Generally, it is 50 μm to 1000 μm, preferably 50 μm to 500 μm, and more preferably 70 to 300 μm from the viewpoint of workability, but the present invention is not limited thereto.

(Manufacturing method of slot liner)
Next, a method of forming the three-dimensional slot liner 1 from the insulating sheet will be described. FIG. 2 is a front view of the insulating sheet 4 used for forming the slot liner 1 according to the first embodiment of the present invention. The region between the alternate long and short dash line 3a shown at both ends of the rectangular insulating sheet 4 in the longitudinal direction and the end 3b of the insulating sheet 4 is a portion to be processed into a collar portion later. The distance between the two alternate long and short dash lines 3a and 3a of the insulating sheet 4 is the axial length of the slot liner 1, and this axial length corresponds to the axial length of the stator core. FIG. 3 is a perspective view of an intermediate product in which the insulating sheet 4 is being processed into the slot liner 1. In the manufacturing method of the present embodiment, first, an insulating sheet cut into a rectangular shape or a square shape as shown in FIG. 2 is bent into a substantially U shape starting from the two broken line portions 3c and 3c of FIG. Process into the shape shown in 3. Specifically, the insulating sheet 4 is arranged in a mold having a substantially U-shaped inner surface, and the insulating sheet 4 is formed so that the broken lines 3c and 3c in FIG. 2 are valley-folded when viewed from the front. Fold it into a U shape. The distance between the two broken line portions 3c and 3c is set so as to correspond to the width of the slot and the width of the U-shaped inner surface of the mold. The portion of the insulating sheet 4 bent along the inner surface of the substantially U-shape of the mold becomes the body portion 2 of the slot liner 1. When the insulating sheet 4 is arranged in the mold, the insulating sheet 4 has a U-shaped inner surface to a U-shaped region in the region between the alternate long and short dash lines 3a and the end 3b of the insulating sheet 4 at both ends of the insulating sheet 4. It is arranged so as to project outward in the axial direction of the inner surface.

Next, the region between the alternate long and short dash line 3a and the end 3b of the insulating sheet 4 is bent while being stretched outward (inward and lateral directions in FIG. 3), and the region between the alternate long and short dash line 3a and the end 3b is the body portion. Bending is stopped at a point substantially perpendicular to 2, and the slot liner 1 shown in FIG. 1 is obtained. Depending on the shape of the flange portion required, the cut shape of the insulating sheet before processing may be appropriately changed, for example, a polygonal shape such as a hexagon may be used, or the edge portion 3b may be curved. , The shape may be a combination of a curved line and a straight line. When the region between the alternate long and short dash line 3a and the end 3b of the insulating sheet 4 is bent outward, it is preferable that the body portion 2 is fixed in the mold from the viewpoint of obtaining a homogeneous collar portion 3. As a method of fixing the copper body portion 2, a method of sandwiching the body portion 2 of the insulating sheet 4 being processed between the U-shaped inner surface of the mold and a member having a shape complementary to the slot inner surface shape is used. However, it is not limited to this. At that time, as the contour of the concave portion of the mold, one having the same shape as the slot of the stator core may be used, or the slot of the stator core may be used as it is as the mold. Further, the member having a shape complementary to the slot inner surface shape is provided with a clearance corresponding to the thickness of the insulating sheet when combined with the mold having the U-shaped inner surface when viewed from the core axial direction. Is preferable. Further, as a method of tilting and tilting the end portion, a method of sandwiching the end edge with a clamp, a method of blowing compressed air, and the like are exemplified, but the method is not limited thereto.

As a method of forming the collar portion, the shape of the inner peripheral surface of the slot and the height of the inner peripheral surface of the slot are maintained in a state where the insulating sheet is sandwiched between the molds having the same height as the body portion, and the horizontal surface is heated from the side surface side of the core. An example is a method of sandwiching the surface of a board and heating and pressurizing it for a certain period of time to fix it. After fixing by heating and pressurizing, the mold may be cooled and then the insulating sheet may be taken out. At that time, it is preferable that the mold that sandwiches the body portion is also fixed while being heated to a predetermined temperature. The temperature of the mold during processing is 100 ° C. to 300 ° C., preferably 150 ° C. to 250 ° C., and the horizontal plate surface temperature sandwiched from the side surface side of the core is 100 ° C. to 300 ° C., preferably 150 ° C. to 250 ° C. Since the mold covering the body is in close contact with the insulating sheet before it is sandwiched between the upper and lower disc surfaces, the time required for the mold covering the body to come into contact with the insulating sheet and complete the formation of the collar is short. Is preferable, specifically, 3 to 300 seconds, more preferably 3 to 60 seconds, and even more preferably 3 to 30 seconds. By fixing the shape as described above, the slot liner of the present invention can be manufactured.

Hereinafter, the present invention will be described in more detail with reference to examples. It should be noted that these examples are merely examples, and are not intended to limit the contents of the present invention.
[Example 1]
(Preparation of raw materials)
A fibrid of polymethaphenylene isophthalamide was produced using a pulp particle production apparatus (wet precipitator) composed of a combination of a stator and a rotor described in JP-A-52-15621. This was processed with a breaker and a beater to prepare a length-weighted average fiber length of 0.9 mm. The drainage degree of the obtained fibrid was 90 cm ³ . On the other hand, a meta-aramid fiber manufactured by DuPont (Nomex (registered trademark), single yarn fineness 2.2 dtex) was cut into a length of 6 mm and used as a raw material for papermaking.
(Manufacturing of aramid paper)
Aramid fibrid and aramid short fibers prepared as described above were each dispersed in water to prepare a slurry. After mixing these slurries so that the mixing ratio (weight ratio) of aramid fibrid and aramid short fibers is 1/1, a sheet-like product is prepared by a ^{tappy type hand-making machine (cross-sectional area 625 cm 2).} did. Next, this was heat-pressed with a metal calendar roll at a temperature of 330 ° C. and a linear pressure of 300 kg / cm to obtain aramid paper.
Furthermore, aramid paper and polyethylene naphthalate film (manufactured by Teijin DuPont Film Co., Ltd., "Theonex (registered trademark) Q51", thickness 100 μm) are bonded together with an adhesive, and the aramid paper is placed on the outside. An aramid-resin film laminate having a three-layer structure of phthalate film / aramid paper was obtained.

(Manufacturing of slot liner)
Using the above aramid-resin film laminate, it is cut as shown in FIG. 2, lightly bent starting from the two broken line portions 3c and 3c in FIG. 2, and then the contour of the outer peripheral surface is the same as the inner peripheral surface of the slot. The convex and concave portions of the mold, which have the same shape and height as those between the two alternate long and short dash lines 3a and 3a in FIG. 2, are sandwiched between the molds while the mold temperature is heated to 240 ° C. A pressure air was blown onto the protruding sheet portion (upper and lower end portions 3 in FIG. 3) for 30 seconds, and the upper and lower end portions were tilted so as to be perpendicular to the body portion to form a collar portion, which was immediately heated to 240 ° C. A slot liner having a shape shown in FIG. 1, which is sandwiched between both sides by a horizontal board surface on the flange, ^{compressed at a surface pressure of 150 kg / cm 2} for 10 seconds, and the distance from the joint with the fuselage to the edge of the collar is 10 mm. Got The main characteristic values of the slot liner thus obtained were evaluated by the following method. The results are shown in Table 1.
[Measuring method]
(1) Grain, thickness, density Performed according to JIS C 2300-2, and the density was calculated by (grain / thickness).
(2) Wrinkles in the collar part The appearance of the collar was visually observed, and those without wrinkles were judged to be "good", those with slight wrinkles were judged to be "almost good", and those with remarkable wrinkles were judged to be "bad".
(3) Warp of the collar part The appearance of the collar was visually observed, and it was judged that the one without warp was "good", the one with slight warp was "almost good", and the one with remarkable warp was "bad". ..
(4) Border dielectric breakdown voltage According to ASTM D149, it was carried out by a direct boosting method using alternating current using an electrode with a diameter of 6 mm. At this time, in order to prevent creepage failure, an electrical insulation tape (650S # 50 manufactured by Teraoka Seisakusho Co., Ltd.) is attached to the entire edge of the collar, and the value at the time of insulation breakdown at the collar is defined as the flange insulation breakdown voltage. did.

[Example 2]
The aramid paper obtained in Example 1 and a semi-aromatic polyamide resin composition containing 50% by weight of an epoxy group-containing phenoxy resin (DuPont Zytel® HTN501 50 parts by weight and an epoxy group-containing phenoxy resin). A semi-aromatic polyamide resin composition prepared by the method described in [0027] of JP-A-2006-321183 using 50 parts by weight), which is described in JP-A-2006-32183 [0024]. To obtain a laminated sheet having a three-layer structure of aramid paper / resin composition / aramid paper in which the aramid paper was arranged on the outside. Using the laminated sheet, a slot liner having the shape shown in FIG. 1 was obtained. The main characteristic values of the slot liner thus obtained were evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 3]
The same procedure as in Example 1 was carried out except that the insulating sheet was changed to aramid paper having the characteristics shown in Table 1, and a slot liner having the shape shown in FIG. 1 was obtained. The main characteristic values of the slot liner thus obtained were evaluated in the same manner as in Example 1. The results are shown in Table 1.

Table 1

From the results shown in Table 1, the slot liner of the present invention had a uniform appearance, a high breakdown voltage at the collar, and the end portion did not protrude even when fitted into the stator core. Further, the slot liner of the present invention can suppress the axial length of the rotary electric machine, and can be expected to reduce the size, increase the efficiency and increase the output of the rotary electric machine using the slot liner.
From the comparison of Examples 1 to 3, the aramid-resin film laminate formed by laminating an aramid paper composed of aramid fibrid and aramid short fibers and a resin film, and the resin formed by melt-extruding onto the aramid paper. It can be seen that a high collar insulation breakdown voltage can be obtained by using the selection from the group consisting of the sheets.

1 Slot liner 2 Body part 3 collar part 3a Insulation sheet single point chain wire part 3b Insulation sheet edge part 3c Insulation sheet broken line part 4 Insulation sheet 5 Slot liner 6 Body part 7 collar part 8 Cuff part 8a Cuff end part

Claims (7)

A slot liner mounted in a slot formed on the inner peripheral surface of the stator core.
Formed from a single insulating sheet,
Slot liner and having a body portion for covering the inner surface of the slot, and a flange portion provided on both ends in the longitudinal direction of the body portion. The slot liner according to claim 1, wherein the collar portion comes into contact with the side end surface of the stator core when mounted on the stator core. The insulating sheet is formed on (i) an aramid paper composed of aramid fibrid and aramid short fibers, (ii) an aramid-resin film laminate formed by laminating the aramid paper and a resin film, and (iii) the aramid paper. The slot liner according to any one of claims 1 and 2, wherein the slot liner is selected from the group consisting of sheets formed by melt-extruding a resin. After fixing the inner surface of the body of the insulating sheet by sandwiching it between a substantially U-shaped heated mold having the shape of the inner peripheral surface of the slot, the end of the insulating sheet protruding from the mold is stretched with respect to the body. Bend outward so that it is substantially at right angles, and then sandwich and fix the bent insulating sheet between the mold installed on the end side and the side surface of the substantially U-shaped mold to form a collar. A method for manufacturing a slot liner having flanges at both ends in the longitudinal direction of the body portion. A motor having a stator core in which a coil is wound in a slot in which the slot liner according to any one of claims 1 to 3 is mounted on an inner peripheral surface. A generator having a stator core in which a coil is wound in a slot in which the slot liner according to any one of claims 1 to 3 is mounted on an inner peripheral surface. A rotary electric machine having a stator core in which a coil is wound in a slot in which the slot liner according to any one of claims 1 to 3 is mounted on an inner peripheral surface.

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