Stator with insulating paper, motor with stator, and method for manufacturing motor

Abstract

Provided are a stator having insulating paper positioned and fixed by a cheap and simple structure, an electric motor having the stator, and a method for manufacturing the stator. The stator (18) of the electric motor comprises: a stator core (26) having a plurality of slots (16); a plurality of coils (32) arranged in the slots; coil end insulating paper (40) arranged between the plurality of coil ends (44) to insulate the coil ends (44) from each other; and a plurality of inter-coil insulating papers (34) arranged in the slots (16), each having a protrusion (38) protruding from an axial end (36) of the stator core. Each coil end insulating paper (40) has an adhesive portion (42), and the plurality of protrusions (38) are bonded to one coil end insulating paper (40).

Description

Technical Field

[0001] The present invention relates to a stator having insulating paper, a motor having the stator, and a method for manufacturing the motor. Background Art

[0002] Conventionally, in motors such as three-phase rotating electrical machines, it is known to insert interphase insulating paper between coils of different phases to insulate them from each other (see, for example, Patent Documents 1-2). Furthermore, it is also known to secure the interphase insulating paper with adhesive tape or the like to prevent it from shifting (see, for example, Patent Documents 3-6).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2007-060819

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2013-207820

[0007] Patent Document 3: Japanese Patent Application Laid-Open No. 09-131012

[0008] Patent Document 4: Japanese Patent Application Laid-Open No. 2008-131749

[0009] Patent Document 5: Japanese Patent Application Laid-Open No. 2007-104826

[0010] Patent Document 6: Japanese Patent Application Laid-Open No. 2005-312222 Summary of the Invention

[0011] Problems to be solved by the invention

[0012] If the interphase insulation paper is too thick relative to the width of the stator core slots, it will be difficult to insert. Conversely, if it is too thin, it will easily fall out. Furthermore, in conventional motors, it is difficult to provide radially fixed interphase insulation paper around the coil ends. This also poses the problem of the interphase insulation paper easily shifting within the slots along with the coils wound around them.

[0013] On the other hand, when the interphase insulation paper has a unique shape corresponding to the coil shape and slot pitch, not only does it increase manufacturing costs, but it also cannot flexibly accommodate various coil shapes and winding configurations. Furthermore, the coil ends must be bent or otherwise shaped to match the interphase insulation paper shape. Consequently, when the interphase insulation paper protrudes from the stator core, the coil length increases.

[0014] Means for solving problems

[0015] One embodiment of the present disclosure is a stator for an electric motor, comprising: a stator core having a plurality of slots; a plurality of coils arranged in the slots and each having a coil end located outwardly of an axial end of the stator core; at least one coil end insulation paper arranged between the plurality of coil ends to insulate the plurality of coil ends from each other; a plurality of inter-coil insulation papers arranged in the slots and each having a protrusion protruding from at least one of the axial end portions of the stator core; and wedge-shaped insulation paper arranged in the slots in which the coils are arranged and inwardly of the coils in the radial direction of the stator core, each of the coil end insulation papers having an adhesive portion, and a plurality of the protrusions being bonded to one coil end insulation paper.

[0016] Another aspect of the present disclosure is an electric motor including the above-mentioned stator.

[0017] Another embodiment of the present disclosure is a method for manufacturing a stator of an electric motor, comprising: inserting a plurality of coils into a plurality of slots of a stator core, so that each of the coils has a coil end located at an outer side than an axial end of the stator core; inserting a plurality of inter-coil insulation papers into the slots, so that each of the inter-coil insulation papers has a protrusion protruding from at least one of the two axial ends of the stator core; and arranging at least one coil end insulation paper having an adhesive portion on at least one of the two axial ends of the stator core, so that each of the coil end insulation papers is arranged between the plurality of coil ends, and the plurality of protrusions are adhered to each of the coil end insulation papers.

[0018] Effects of the Invention

[0019] According to the present disclosure, multiple inter-coil insulation papers are secured by at least one coil end insulation paper. More specifically, the inter-coil insulation paper is bonded to multiple locations on each coil end insulation paper. This facilitates positioning and securing of the coil end insulation paper. Furthermore, the structure composed of such coil end insulation paper and inter-coil insulation paper can be used in stators of electric motors with any number of poles and slot configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view showing a schematic structure of the electric motor of the present disclosure.

[0021] Figure 2 This is a perspective view showing the stator core of Example 1.

[0022] Figure 3 This figure shows a state where slot liner insulation paper is arranged in the slots of the stator core.

[0023] Figure 4This is a diagram showing a state where the first-phase coil is inserted into the slot.

[0024] Figure 5 This is a diagram showing a state where the first inter-coil insulating paper is inserted into the slot.

[0025] Figure 6 This is a diagram showing a state where the first coil end insulation paper is adhered to the protruding portion of the first inter-coil insulation paper.

[0026] Figure 7 This figure shows a state where coil end insulation paper is bonded to all protruding portions.

[0027] Figure 8 This is a diagram showing a state where the second-phase coil is inserted into the slot.

[0028] Figure 9 This is a diagram showing a state where the second inter-coil insulating paper is inserted into the slot.

[0029] Figure 10 This is a diagram showing a state where the second coil end insulation paper is adhered to the protruding portion of the second inter-coil insulation paper.

[0030] Figure 11 This is a diagram showing a state where the third-phase coil is inserted into the slot.

[0031] Figure 12 This figure shows a state where wedge-shaped insulating paper is inserted into the slot.

[0032] Figure 13 This is a perspective view showing a state in which the first coil end insulation paper is bonded to the protruding portion of the first inter-coil insulation paper in the stator of Example 2.

[0033] Figure 14 This is a perspective view showing a state in which wedge-shaped insulating paper is inserted into the slots of the stator of Example 2.

[0034] Figure 15 This is a diagram schematically showing the positional relationship between the coil and the insulating paper in the slot.

[0035] Figure 16 This is a diagram schematically showing the positional relationship between the coil and the coil end insulating paper. DETAILED DESCRIPTION

[0036] Figure 1This is a radial cross-sectional view schematically illustrating the structure of an electric motor 10 according to a preferred embodiment of the present invention. Electric motor 10 is a 10-pole, 36-slot, three-phase AC motor comprising: a rotor 12 having multiple pairs of magnetic poles; a stator 18 having multiple slots 16 extending in the direction of the rotation axis 14 of rotor 12 and arranged circumferentially about the rotation axis 14, radially opposed to rotor 12; multiple windings inserted into slots 16 and wound around stator 18; and a sheet-like insulator (described later) disposed adjacent to the windings. However, the present disclosure is not limited thereto; for example, there are no particular limitations on the number of poles, number of slots, coil shape, or number of phases of the motor.

[0037] The rotor 12 includes a plurality (here, ten) of (permanent) magnets 20, a rotor core 22, and a rotor shaft 24, and rotates about a rotation axis 14. The present disclosure primarily features the structure of the sheet-like insulator (hereinafter referred to as insulating paper) disposed within or near slots 16 formed in a stator core 26 of the stator 18. Therefore, description of the rotor 12 will be omitted in the following description.

[0038] (Example 1)

[0039] Next, refer to Figures 2 to 12 The structure and manufacturing method of the stator 18 will be described. Here, an example in which three-phase (U, V, W) coils are arranged in a stator core 26 having 36 slots 16 will be described.

[0040] First, if Figure 2 As shown, a stator core 26 having a plurality of slots 16 (36 in the example shown) is prepared, and then, as shown in FIG. Figure 3 As shown, slot liner insulation paper 30 is arranged in each slot 16. In the illustrated example, slot liner insulation paper 30 is inserted in all slots 16. However, if there are slots where no winding (coil) described later is inserted, slot liner insulation paper 30 and wedge-shaped insulation paper 62 described later may not be arranged in these slots.

[0041] Then, if Figure 4 As shown, first phase (eg, U phase) coils 32 are inserted into some (here, slots 16a) of the plurality of slots 16. That is, the slot liner insulating paper 30 is constructed and arranged to electrically insulate the stator core 26 from the coils in the slots.

[0042] Then, if Figure 5As shown, a longitudinally long (long and narrow in the axial direction of the stator core 26) first inter-coil insulating paper (inter-phase insulating paper) 34 is inserted into the slot 16a into which the U-phase coil 32 is inserted. The first inter-coil insulating paper 34 is configured and arranged so as to have a protrusion 38 protruding axially from the end 36 on at least one of the two axial ends 36 of the stator core 26. Preferably, the first inter-coil insulating paper 34 has a length longer than the axial length of the stator core 26, as shown in FIG. Figure 5 As shown, the groove 16 a is arranged so as to protrude from both end portions 36 in the axial direction.

[0043] Then, if Figure 6 As shown, multiple first coil end insulation papers 40, each having an adhesive portion 42, are arranged so that a single coil end insulation paper 40 is bonded to multiple protrusions 38. In the illustrated example, the long strip of first coil end insulation paper 40 extends circumferentially near the end face 36 of the stator core 26, and is bonded so that the adhesive portions 42 provided at least at both ends overlap with the protrusions 38 of the first inter-coil insulation paper 34. Alternatively, the first coil end insulation paper 40 may have an adhesive portion 42 on its entire single surface, bonded to the protrusions 38, and also bonded to the coil end 44 of the coil 32.

[0044] In this application, a wire or a bundle of wires such as copper wires through which current flows is referred to as a "winding," and a component formed into a ring shape (including an 8-shaped shape, etc.) that closes the winding is referred to as a "coil." Furthermore, a "coil end" refers to the portion of the coil that is not inserted into the slot of the stator core, that is, the portion that exists axially outward of the axial end of the stator core. Multiple (same-phase) coils can be connected by a so-called "lap wire" (see below). Figure 16 ) wires or windings are electrically connected to each other.

[0045] Then, if Figure 7 As shown, repeat in Figure 6 The operation described in the above is performed so that all the protrusions 38 are bonded to any one of the multiple first coil end insulation papers 40. At this time, it is preferred that (preferably all) the coil ends 44 of the U-phase coil 32 are also bonded to the first coil end insulation paper 40 (the bonding portion 42). In addition, as shown in the figure, multiple long strips of coil end insulation paper 40 are attached to each other at their ends in the longitudinal direction, and can be set as a ring shape as a whole, but this process can also be omitted. In addition, the first coil end insulation paper 40 is constructed and arranged in a manner that the coil end 44 of the U-phase coil 32 and the coil end 56 of the V-phase coil 46 described later do not contact each other (that is, in an electrically insulated manner).

[0046] Then, if Figure 8 As shown, Figure 4In the same manner as described above, coils 46 of the second phase (e.g., V phase) are inserted into some of the slots 16 (here, slots 16b) among the plurality of slots 16. At this time, V phase coil 46 may be inserted into slot 16a where U phase coil 32 is inserted. In this case, first inter-coil insulating paper 34 is arranged between U phase coil 32 and V phase coil 46 within slot 16b (16a). Specifically, first inter-coil insulating paper 34 is constructed and arranged to electrically insulate two coils of different phases.

[0047] In addition, in the case of a motor having a different number of current phases and a different number of layers of coil ends from those in the first embodiment, Figures 5 to 8 The number of times the operation shown is performed varies. For example, in the manufacturing process of the stator of the motor in which the number of current phases and the number of layers of coil ends are greater than those in Example 1, Figures 5 to 8 The number of executions of the operations shown increases accordingly.

[0048] Then, if Figure 9 As shown, Figure 5 In the same manner as the above process, a longitudinally long second inter-coil insulating paper (inter-phase insulating paper) 48 is inserted into the slot 16b into which the V-phase coil 46 is inserted. The second inter-coil insulating paper 48 is constructed and arranged in the same manner as the first inter-coil insulating paper 34, so that at least one of the two axial ends 36 of the stator core 26 has a protrusion 50 that protrudes axially from the end 36. Preferably, the second inter-coil insulating paper 48 has a length longer than the axial length of the stator core 26, as shown in FIG. Figure 9 As shown, the second inter-coil insulating paper 48 is arranged in the slot 16b so as to protrude in the axial direction from both ends 36. In addition, the second inter-coil insulating paper 48 may have the same shape, size, and material as the first inter-coil insulating paper 34.

[0049] Then, if Figure 10 As shown, Figure 6 In the same manner as in the previous step, multiple second coil end insulation papers 52, each having an adhesive portion 54, are arranged so that one coil end insulation paper 52 is attached to multiple protrusions 50. In the illustrated example, the long strip of second coil end insulation paper 52, like the first coil end insulation paper 40, extends circumferentially near the end face 36 of the stator core 26 and is attached so that at least each of the adhesive portions 54 provided at both ends overlaps with the protrusion 50 of the second inter-coil insulation paper 48. In this case, the second coil end insulation paper 52 may also have an adhesive portion 54 on its entire single surface, attached to the protrusion 50, and also attached to the coil end 56 of the coil 46.

[0050] Then, if Figure 10 As shown, repeat in Figure 9The operation described in the above is performed so that all the protrusions 50 are bonded to any one of the plurality of second coil end insulation papers 52. At this time, it is preferred that (preferably all) the coil ends 56 of the V-phase coil 46 are also bonded to (the bonding portion 54 of) the second coil end insulation paper 52. In addition, as shown in the figure, a plurality of long strips of coil end insulation paper 52 are adhered to each other at their ends in the longitudinal direction, and can be set as a ring shape as a whole, but this process can also be omitted. In addition, the second coil end insulation paper 52 is constructed and arranged in a manner that the coil end 56 of the V-phase coil 46 and the coil end 60 of the W-phase coil 58 described later do not contact each other (that is, in an electrically insulated manner).

[0051] Then, if Figure 11 As shown, Figure 4 and Figure 8 In the same manner as described above, a winding (coil) 58 of the third phase (e.g., W-phase) is inserted into some of the plurality of slots 16 (here, slots 16c). At this point, there are also cases where W-phase coil 58 is inserted into slot 16a where U-phase coil 32 is inserted, or slot 16b where V-phase coil 46 is inserted. In this case, first inter-coil insulating paper 34 or second inter-coil insulating paper 48 is arranged between U-phase coil 32 or V-phase coil 46 and W-phase coil 58 within slot 16c (16a or 16b). Specifically, first inter-coil insulating paper 34 can be configured and arranged to electrically insulate two coils of different phases (here, U-phase coil 32 and W-phase coil 58). Similarly, second inter-coil insulating paper 48 can be configured and arranged to electrically insulate two coils of different phases.

[0052] Finally, if Figure 12 As shown, wedge-shaped insulating paper 62 is inserted into slots 16a to 16c, or into all slots 16, into which at least one coil is inserted. More specifically, wedge-shaped insulating paper 62 has a length substantially equal to the axial length of stator core 26 and a wedge-shaped cross-section. It is positioned radially inward of the coils arranged in each slot of stator core 26 and functions to retain the coils in the slots, preventing them from shifting within the slots or falling out of the slots.

[0053] Figures 2 to 12 The steps shown can be automated using known mechanical equipment, but can also be partially or entirely performed manually. In addition, in Example 1, the structure and arrangement of the coil end and the insulating paper at one axial end (upper end) of the stator 18 are mainly described. However, even at the lower end of the stator 18, such as at Figure 12 As shown in the figure, a part thereof can be provided, and the structure and arrangement can be the same as the upper end.

[0054] (Example 2)

[0055] Figure 13 and Figure 7 Similarly, a step of the manufacturing method of the stator of the motor of Example 2 is shown. In Example 1, a plurality of long strips of first coil end insulation paper 40 are bonded to the protrusion 38 ( Figure 6 ), and then the first coil end insulation papers 40 are connected to each other to form a ring-shaped component ( Figure 7 ), however, in Example 2, a first coil end insulation paper 40' pre-formed into a roll or ring shape is prepared and attached to all protrusions 38 protruding from either axial end (preferably both ends) of the stator core. The remaining components of Example 2 can be the same as those of Example 1, and therefore, are denoted by the same reference numerals as in Example 1, and detailed descriptions thereof are omitted.

[0056] Figure 14 The figure shows a state where the wedge-shaped insulating paper 62 is inserted into the slot 16 in the stator 18' of the motor of the second embodiment. In the first embodiment, a plurality of long strips of second coil end insulating paper 52 are bonded to the protrusion 50 of the second inter-coil insulating paper 48, and then the second coil end insulating paper 52 are connected to each other to form a ring-shaped member ( Figure 10 ), however, in Example 2, a second coil end insulation paper 52' ​​is pre-formed into a roll or ring shape and is bonded to all protrusions 50 protruding from either axial end (preferably both ends) of the stator core. The remaining components of Example 2 are the same as those of Example 1, and therefore, are designated by the same reference numerals as in Example 1, and detailed descriptions thereof are omitted.

[0057] The manufacturing process of the stator of Example 2 is similar to that of Example 1 and can be automated using known machinery, but can also be performed partially or entirely manually. Furthermore, in Example 2 as well, the coil ends and insulating paper can be configured and arranged identically at the upper and lower ends of the stator 18 in the axial direction.

[0058] Of the four types of insulating paper in Examples 1 or 2, the slot liner insulating paper and the wedge-shaped insulating paper can have the same shapes as those used in conventional stator cores of electric motors. Preferred materials for the slot liner insulating paper, the wedge-shaped insulating paper, and the inter-coil (inter-phase) insulating paper include aramid fiber papers such as PPS film, PET film, PEN film, and NOMEX (registered trademark) paper; multilayered films comprising PPS, an adhesive layer, and PET; and multilayered films comprising aramid fiber paper and PET film.

[0059] Preferred materials for coil end insulation paper include NOMEX (registered trademark) paper coated with an acrylic adhesive to form an insulating adhesive tape, and epoxy resin-reinforced polyester film substrate coated with a thermosetting rubber adhesive to form an insulating adhesive tape. The latter, in particular, has a very high mechanical property, with an elongation of approximately 120%, making it particularly preferred for the following reasons.

[0060] In the actual manufacturing process of the motor (stator), Figure 12 or Figure 14 As shown, after all the coils are inserted into the slots, in order to adjust the shape of the coil ends, an additional step is sometimes performed, such as punching the stator ends with a force of 1 to 5 tons to compress the coil ends. At this time, the coil end insulation paper attached to the coil ends expands and contracts. Therefore, if the elongation of the coil end insulation paper is relatively low, the coil end insulation paper may break, and the insulation between the coil ends of different phases may be damaged. To prevent such adverse conditions, considering the deformation of the coil ends caused by general punching, the elongation of the coil end insulation paper as a mechanical property is preferably 50% or more, more preferably 80% or more, and even more preferably 100% or more.

[0061] Figure 15 The diagram shows the positional relationship between the coils and insulating paper within slots 16 of stator core 26. Slots 16 are spaces defined between multiple teeth 64 of stator core 26. In the illustrated example, slot liner insulating paper 30, U-phase coil 32, first inter-coil insulating paper 34, V-phase coil 46, and wedge-shaped insulating paper 62 are arranged within slots 16.

[0062] The slot liner insulating paper 30 is shaped to conform to the internal shape of the slot 16 and functions to insulate the stator core 26 from the coils 32 and 46. Furthermore, the wedge-shaped insulating paper 62 blocks the opening (slit) of the slot 16 to partially retain the V-phase coil 46 (primarily radially inward), thereby preventing the coil in the slot 16 from shifting within the slot 16 or falling out of the slot 16.

[0063] The first inter-coil insulating paper 34 partially surrounds the U-phase coil 32 (primarily radially inward) and insulates the U-phase coil 32 from the V-phase coil 46. Specifically, when two coils of different phases are inserted into the same slot, the first inter-coil insulating paper 34 functions as inter-phase insulating paper, insulating the coils from each other. This also applies to the second inter-coil insulating paper 48. Furthermore, when three (three-phase) coils are inserted into a single slot, two inter-coil insulating papers are used to insulate the three coils from each other.

[0064] As described above, when multiple coils of different phases are inserted into a single slot, the inter-coil insulating paper functions as interphase insulating paper, insulating the coils from each other. However, it can also be inserted into a slot without a coil or into a slot with only one coil. However, when inserting inter-coil insulating paper into a slot with a single coil, the inter-coil insulating paper is inserted after the coil has been inserted. Thus, the inter-coil insulating paper sometimes does not function as interphase insulating paper, but even in this case, it functions as a component for easily and reliably positioning and securing the coil end insulating paper.

[0065] Figure 16 This diagram primarily illustrates the function of coil end insulation paper, using first coil end insulation paper 40 as an example. Multiple U-phase coils 32 and multiple V-phase coils 46 are inserted into slots 16. The U-phase coils 32 are interconnected by bonding wires 66, and the V-phase coils 46 are interconnected by bonding wires 68.

[0066] Here, as shown, when coil ends 44 and 56 of U-phase coil 32 and V-phase coil 46 overlap when viewed in the radial direction of the stator, first coil end insulation paper 40 is arranged between the two coil ends so that the coil ends of different phases do not contact (conduct) with each other, or so that the bonding wires 66 and 68 do not contact (conduct) with each other. Thus, the coil end insulation paper is a sheet-like member that insulates multiple coil ends or multiple bonding wires of different phases flowing in the area outside the axial end face 36 of the stator core.

[0067] Furthermore, the coil end insulation paper can be bonded to the coil end to prevent positional misalignment, but this is not required. In other words, the coil end insulation paper can be of any shape or material, as long as it is bonded to multiple inter-coil insulation papers and can physically isolate the coil ends of different phases.

[0068] In Examples 1 and 2, the inter-coil insulating paper and the coil end insulating paper are both sheet-like components, and therefore can be bonded to each other with a relatively high bonding force. On the other hand, the coil ends are formed by bundling the windings, and therefore, the bonding force with the coil end insulating paper is relatively low. For example, after the manufacture of the stator or during the use of the motor, the coil end insulating paper and the coil end may also separate from each other. However, as mentioned above, the coil end insulating paper only needs to be able to physically isolate the coil ends of different phases, and therefore, there will be no problem with the performance of the motor. In addition, the coil end insulating paper is a flexible sheet-like component such as paper or film, and therefore, it is easy to follow the shape of the coil end, and therefore, there is no need to lengthen the coil end (coil length).

[0069] In the above-mentioned embodiment, the inter-coil insulating paper can be automatically inserted into the slot, and can be inserted by the same device and method as the wedge-shaped insulating paper. In addition, with respect to the coil end insulating paper (such as an adhesive tape) having an adhesive portion, since positioning is easy, its configuration is suitable for automation, especially when each end of the stator core is configured as a plurality of long strip-shaped parts as in Example 1, automation becomes easy by pre-forming the backing paper into a predetermined shape in the state of sticking the backing paper to the adhesive portion. Moreover, if the coil end insulating paper is also stuck to the coil end when sticking it to the protruding portion of the inter-coil insulating paper, radial positioning and fixing also become easy. In this way, in the present disclosure, the coils can be insulated with a cheap and simple structure by simple long strips of inter-coil insulating paper and long strips or ring-shaped coil end insulating paper. In addition, even in the case of different pole numbers and winding configurations, there is no need to prepare inter-coil insulating paper and coil end insulating paper of different shapes.

[0070] Explanation of symbols

[0071] 10 3-phase AC motor;

[0072] 12 rotors;

[0073] 14 axis of rotation;

[0074] slots 16, 16a, 16b, 16c;

[0075] 18, 18' stator;

[0076] 20 magnets;

[0077] 22 rotor core;

[0078] 24 axes;

[0079] 26 stator core;

[0080] 30 slots lined with insulating paper;

[0081] 32, 46, 58 coils;

[0082] 34, 48 Insulation paper between coils;

[0083] 36 end face;

[0084] 38, 50 protrusions;

[0085] 40, 40', 52, 52' coil end insulation paper;

[0086] 42, 54 bonding part;

[0087] 44, 56, 60 coil ends;

[0088] 62 wedge-shaped insulating paper;

[0089] 64 teeth;

[0090] 66, 68 overlap lines.

Claims

1. A stator of an electric motor, characterized in that: have: a stator core having a plurality of slots; a plurality of coils disposed in the slots and each having a coil end portion located outside an axial end portion of the stator core; At least one coil end insulating paper is disposed between the plurality of coil ends to insulate the plurality of coil ends from each other; a plurality of inter-coil insulating papers arranged in the slots and each having a protrusion protruding from at least one of the axial end portions of the stator core; as well as wedge-shaped insulating paper is arranged in the slot where the coil is arranged, and is arranged inward of the coil in the radial direction of the stator core. Each of the coil end insulation papers has an adhesive portion, the plurality of protrusions are attached to one coil end insulation paper, and the adhesive portion of the coil end insulation paper is also bonded to the coil end.

2. The stator of the electric motor according to claim 1, characterized in that The inter-coil insulation paper also functions as inter-phase insulation paper for insulating between coils arranged in one of the slots through which currents of different phases flow.

3. The stator of the electric motor according to claim 1 or 2, characterized in that: The inter-coil insulating paper protrudes from both ends of the stator core.

4. The stator of the electric motor according to claim 1 or 2, characterized in that: The coil end insulation paper has an elongation of 50% or more as a mechanical property.

5. An electric motor, characterized in that: have: The stator according to any one of claims 1 to 4.

6. A method for manufacturing a stator of an electric motor, characterized in that: Include: Inserting a plurality of coils into a plurality of slots of a stator core such that each of the coils has a coil end portion located outward of an axial end portion of the stator core; inserting a plurality of inter-coil insulation papers into the slots, so that each of the inter-coil insulation papers has a protrusion protruding from at least one of the axial end portions of the stator core; as well as Next, at least one coil end insulation paper having an adhesive portion is arranged on at least one of the axial end portions of the stator core, so that each of the coil end insulation papers is arranged between the multiple coil ends, and the multiple protrusions are attached to each of the coil end insulation papers.

7. The manufacturing method according to claim 6, characterized in that The manufacturing method comprises: inserting a plurality of inter-coil insulation papers into the slots so that each of the inter-coil insulation papers has protrusions protruding from both ends of the stator core; as well as At least one coil end insulation paper having an adhesive portion is arranged at each of the two axial ends of the stator core, so that each of the coil end insulation papers is arranged between the multiple coil ends, and the multiple protrusions are attached to each of the coil end insulation papers.

8. The manufacturing method according to claim 6 or 7, characterized in that: The manufacturing method comprises: Preparing a plurality of long strips of the coil end insulation paper; and The plurality of coil end insulation papers are arranged such that all of the plurality of protrusions protruding from the same axial end of the stator core are bonded to any one of the coil end insulation papers.

9. The manufacturing method according to claim 6 or 7, characterized in that: The manufacturing method comprises: preparing the coil end insulating paper formed into a ring shape having a diameter larger than the inner diameter of the stator core; and The coil end insulation paper is bonded to all of the protruding portions protruding from the same axial end of the stator core.

10. The manufacturing method according to claim 6 or 7, characterized in that: Disposing the coil end insulation paper includes bonding the coil end insulation paper to the coil end.

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