Insulating sheet, and stator and motor provided with same

Abstract

An insulating sheet attached to a stator core of a motor is a sheet having an H shape in plan view, the sheet having notches facing inward formed on two first sides facing each other. The notch has a first corner portion and a second corner portion. The first corner portion is formed at a crossing portion where the third side and the fourth side intersect. The third side is parallel to the first side and is positioned further inward than the first side. The fourth side is inclined at a first angle relative to the third side. The first corner portion has a fifth side inclined at a second angle less than 90 degrees with respect to the third side in plan view.

Description

Technical Field

[0001] The present invention relates to an insulating sheet, and a stator and a motor including the insulating sheet. Background Art

[0002] Conventionally, in industrial motors such as servomotors, an insulating sheet is used to insulate a coil from a stator core inside a stator. The insulating sheet is accommodated so as to cover the inner surface of a slot provided in the stator core, and the coil is accommodated inside the insulating sheet.

[0003] On the other hand, since the axial end portions of the stator core are generally not covered with an insulating sheet, it is necessary to separately prepare insulating members and attach them to the end portions.

[0004] Patent Document 1 discloses a structure in which an insulating thin article having a V-shaped bent portion is sandwiched between a coil and a stator core in order to eliminate an insulating member and reduce the number of components. In addition, according to this structure, a constant distance can be ensured between the coil and the stator core. That is, the insulation distance between the coil and the stator core can be made constant.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2005-124295 Summary of the invention

[0008] However, in the conventional structure disclosed in Patent Document 1, in order to ensure the insulation distance between the coil and the axial end face of the stator core, the V-shaped bent portion needs to be set higher in the axial direction. In addition, the axial height of the coil surrounding portion continuous with the bent portion also needs to be higher.

[0009] However, when the insulating thin material is configured in this way, the axial length of the stator and thus the motor becomes longer, which becomes a factor that hinders the miniaturization of the motor.

[0010] The present invention has been made in view of this point, and an object of the present invention is to provide an insulating sheet capable of suppressing an increase in the size of the stator in the axial direction while ensuring an insulation distance between a coil and a stator core, and a stator and a motor including the insulating sheet.

[0011] In order to achieve the above-mentioned purpose, the insulating sheet of the present invention is an insulating sheet installed on the stator of the motor. The insulating sheet is a sheet that is H-shaped when viewed from above and has notches facing inward formed on two opposing first sides. The notch has a first corner portion and a second corner portion. The first corner portion is formed continuously with a third side that is parallel to the first side and located on the inner side of the first side and the first side, or the first corner portion is formed at an intersection portion where a third side that is parallel to the first side and located on the inner side of the first side intersects with a fourth side that is continuous with the first side and inclined at a first angle relative to the third side. Furthermore, it is characterized in that at least the first corner portion is rounded in a manner having a first radius of curvature, or has a fifth side that is inclined at a second angle less than 90 degrees relative to the third side when viewed from above.

[0012] The stator of the present invention is a stator of a motor equipped with an insulating sheet. The stator has at least a stator core, a slot and a coil. The stator core has an annular yoke and a plurality of teeth arranged at equal angles on the inner surface of the yoke. The slot is a space surrounded by the inner surfaces of adjacent stator cores. The coils are respectively mounted on the plurality of teeth with insulating sheets sandwiched therebetween. When the length direction of the rotating shaft of the motor is set as the axial direction, the insulating sheet is accommodated in the slot in a bent state. The notch protrudes from the axial end face of the stator core and is arranged outside the slot. The stator of the motor is characterized in that the insulation distance between the axial end face of the stator core and the portion of the coil abutting against the edge of the first corner portion is constant.

[0013] A motor according to the present invention is characterized by comprising at least a stator and a rotor provided at a predetermined distance from the stator.

[0014] According to the present invention, it is possible to relatively suppress an increase in the size of the stator and thus the motor in the axial direction while ensuring the insulation distance between the coil and the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a plan view of the motor according to the embodiment as viewed from the axial direction.

[0016] Figure 2 This is a top view of the main part of the stator as seen from the axial direction.

[0017] Figure 3A This is a perspective view of the main parts of the stator as seen from above.

[0018] Figure 3B This is a perspective view of the main parts of the stator as seen from above.

[0019] Figure 3C This is a perspective view of the main parts of the stator as seen from below.

[0020] Figure 3DThis is a perspective view of the main parts of the stator as seen from below.

[0021] Figure 4A It is a top view of the insulating sheet in the unfolded state.

[0022] Figure 4B yes Figure 4A An enlarged view of the portion surrounded by the dotted line in FIG.

[0023] Figure 5 It is a schematic diagram comparing the main part of the insulating sheet of the embodiment and the main part of the insulating sheet of the comparative example.

[0024] Figure 6 It is a plan view of a main part of an insulating sheet according to a modified example. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or uses at all.

[0026] (Implementation Method)

[0027] [Motor structure]

[0028] Figure 1 FIG. 2 is a top view showing the motor of this embodiment when viewed from the axial direction. Figure 1 In the figure, illustration and description of the bridge wire between the coils 40 and the external terminal which becomes the connection part with an external power supply are omitted.

[0029] In the following description, the radial direction of the motor 1000 is sometimes referred to as the “radial direction”, the peripheral direction is sometimes referred to as the “circumferential direction”, and the direction in which the rotating shaft 220 of the motor 1000 extends (which is the same as the radial direction) is sometimes referred to as the “circumferential direction”. Figure 1 The direction perpendicular to the paper in the figure) and in this case, the longitudinal direction of the rotating shaft 220 is referred to as the "axial direction". In addition, in the radial direction, the center side of the motor 1000 is sometimes referred to as the radial inner side, and the outer peripheral side is sometimes referred to as the radial outer side. In the axial direction, the split insulator 51 is arranged on the tooth 10 (see Figure 3A ) is called the upper side or the top side, and the split insulating member 52 (refer to Figure 3C ) is called the lower or underneath side.

[0030] The motor 1000 includes at least a stator 100 and a rotor 200. It should be noted that the motor 1000 has components other than these, such as bearings for supporting the rotating shaft 220, a motor housing, etc., but for the sake of convenience, their illustration and description are omitted. The motor 1000 is a so-called inner rotor type motor, but is not particularly limited to this, and may also be an outer rotor type motor.

[0031] The stator 100 includes at least a stator core 30, a plurality of coils 40, an insulator 50, and an insulating sheet 60 (see Figure 2 ). The stator core 30 is composed of an annular yoke 20 and a plurality of teeth 10 (see Figure 2 ) is formed. The plurality of teeth 10 are arranged at equal angles and spaced apart from each other along the inner circumference (inner surface) of the yoke 20. The yoke 20 is a plurality of split yokes 21 (see Figure 2 ) is a circular ring-shaped component connected in the circumferential direction. The teeth 10 and the split yoke 21 are both made of magnetic materials. It should be noted that in the following description, the split yoke 21 provided with the teeth 10 is sometimes also referred to as the stator core 30.

[0032] In the present embodiment, the yoke 20 is formed by connecting a plurality of split yokes 21 in the circumferential direction. However, the present invention is not particularly limited thereto, and the stator core 30 may be formed by integrating the annular yoke 20 and the plurality of teeth 10 .

[0033] In addition, the space surrounded by the inner surface of the stator core 30 adjacent to each other in the circumferential direction is formed as a slot 31 (see Figure 2 ), the coils 40 are housed in the plurality of slots 31. The stator 100 is arranged radially outside the rotor 200 at a constant interval from the rotor 200.

[0034] The coil 40 is a component formed by winding a conductive wire having an insulating film (not shown) formed on the surface. The coil 40 is mounted on the stator core 30 with the insulating sheet 60 and the insulating member 50 sandwiched therebetween and is accommodated in the slot 31. It should be noted that it can also be said that the coil 40 is mounted on the plurality of teeth 10 with the insulating sheet 60 sandwiched therebetween. In addition, the coil 40 is sometimes referred to as coils U1 to U4, V1 to V4, and W1 to W4, respectively, in accordance with the phase of the current flowing to the coil 40.

[0035] The insulator 50 is a member made of an insulating material mounted on the stator core 30, and together with the insulating sheet 60, electrically separates the coil 40 from the stator core 30. It should be noted that in this embodiment, as the insulator 50, split insulators 51 and 52 (see Figure 2 , Figures 3A to 3D ), but it does not need to be split.

[0036] An insulating sheet 60 is provided between the coil 40 and the stator core 30 (see Figure 2 , Figures 3A to 3D ). The insulating sheet 60 is formed by processing insulating paper or a resin insulating sheet into a predetermined shape. The shape of the insulating sheet 60 will be described later.

[0037] The rotor 200 includes a rotor core 210, a rotating shaft 220, and a magnet 230. The rotor core 210 has a through hole at the axis and is substantially cylindrical. The rotating shaft 220 is inserted through the through hole of the rotor core 210. The magnet 230 faces the stator 100 and the N pole and the S pole are alternately arranged along the outer circumference of the rotor core 210.

[0038] Coils U1 to U4, V1 to V4, and W1 to W4 are connected in series. Three-phase currents of U, V, and W phases having a phase difference of 120° in electrical angle are supplied to coils U1 to U4, V1 to V4, and W1 to W4 to be excited, thereby generating a rotating magnetic field in the stator 100. The rotating magnetic field interacts with the magnetic field generated by the magnet 230 provided on the rotor 200, generating torque in the rotor 200, and the rotating shaft 220 is supported by a bearing (not shown) to rotate.

[0039] [Main parts of the stator and the structure of the insulation sheet]

[0040] Figure 2 It is a plan view showing the main part of the stator when viewed from the axial direction. Figure 3A , 3B A perspective view showing a main part of the stator as seen from above is shown. Figure 3C , 3D Each of the figures shows a perspective view of a main part of the stator as seen from below. Figure 4A A plan view showing the insulating sheet in an unfolded state. Figure 4B Show Figure 4A It should be noted that in order to facilitate the understanding of the structure of the stator core 30 and the insulating sheet 60, Figure 2 The coil 40 is shown by a dotted line in FIG. Figure 3A-3B In the figure, the coil 40 is omitted. Figure 3B In the figure, the split insulating member 51 is omitted. Figure 3D In the figure, the divided insulating member 52 is omitted.

[0041] like Figure 2 As shown, the insulating sheet 60 is folded and accommodated inside the slot 31. The insulating sheet 60 covers the inner surface of the stator core 30, specifically, the circumferential side surface of the tooth 10 and the radial inner surface of the split yoke 21. In addition, the coil 40 wound around the tooth 10 is accommodated inside the space (slot 31) surrounded by the insulating sheet 60. That is, the insulating sheet 60 electrically insulates the coil 40 from the stator core 30.

[0042] In addition, if Figure 2 As is clear, two coils 40 are respectively partially accommodated in one slot 31 and are accommodated adjacent to each other. The insulating sheet 60 also electrically insulates the adjacent coils 40 inside the slot 31 .

[0043] In addition, the split insulating members 51 and 52 sandwich the insulating sheet 60 and cover the axial end faces of the stator core 30 respectively. Figure 3A , 3B As shown in FIG. 1 , the split insulator 51 includes a coil winding portion 51 a, a flange portion 51 b located radially outward, and a flange portion 51 c located radially inward. Figure 3A As shown, grooves 51b1 and 51c1 are formed in flanges 51b and 51c, respectively. Although not shown, grooves 51b1 and 51c1 are connected to form a groove portion. The third to seventh sides 63, 64, 65, 66, and 67 of the notch 70 on one side of the insulating sheet 60 are sandwiched in the groove portion connected from groove 51b1 to groove 51c1.

[0044] In addition, if Figure 3C , 3D As shown in FIG. 1 , the split insulator 52 includes a coil winding portion 52a, a flange portion 52b located radially outward, and a flange portion 52c located radially inward. Figure 3C As shown, grooves 52b1 and 52c1 are formed in flanges 52b and 52c, respectively. Although not shown, grooves 52b1 and 52c1 are connected to form a groove portion. The third to seventh sides 63, 64, 65, 66, and 67 included in the other notch 70 of the insulating sheet 60 are sandwiched in the groove portion connected from groove 52b1 to groove 52c1.

[0045] That is, Figure 3A , 3B As shown, the insulating sheet 60 is sandwiched between the groove portion extending from the groove 51b1 to the groove 51c1 provided in the split insulating member 51 and the groove portion extending from the groove 52b1 to the groove 52c1 provided in the split insulating member 52. In this way, the position of the insulating sheet 60 is fixed relative to the split insulating members 51 and 52.

[0046] The coil 40 is attached to the stator core 30 in contact with the surfaces of the coil winding portions 51 a and 52 a of the divided insulators 51 and 52 .

[0047] like Figure 4A As shown, the insulating sheet 60 in the unfolded state is an H-shaped sheet in a plan view. That is, the two opposite sides (hereinafter referred to as the first side 61) of the quadrilateral sheet in a plan view are respectively formed with notches 70 facing the inside (inner side) of the insulating sheet 60. It should be noted that, in the state of being accommodated in the slot 31, the second side 62 of the insulating sheet 60, which is orthogonal to the first side 61, is parallel to the axial direction.

[0048] It should be noted that in the present application specification, “orthogonal” or “parallel” means to include manufacturing errors and assembly tolerances of the components constituting the motor 1000, and does not mean that the comparison objects are strictly orthogonal or parallel to each other.

[0049] like Figure 4A , 4B As shown, the notch 70 of the insulating sheet 60 includes a third side 63, a fourth side 64, and a first corner portion 71. When the insulating sheet 60 is unfolded, the third side 63 is parallel to the first side 61. The fourth side 64 is continuous with the first side 61 and parallel to the second side 62. That is, the fourth side 64 forms a first angle θ1 (=90 degrees) with respect to the third side 63. It should be noted that the first angle θ1 can be less than 90 degrees (θ1≤90).

[0050] In addition, the first corner portion 71 is provided at the intersection of the third side 63 and the fourth side 64. In the present embodiment, the first corner portion 71 is configured as a fifth side 65 which is linearly connected to one end of the third side 63 and one end of the fourth side 64 and which forms a second angle θ2 (=45 degrees) with respect to the third side 63. It should be noted that the second angle θ2 is not limited to 45 degrees, and may be greater than 0 degrees and smaller than the first angle θ1 (0<θ2<θ1).

[0051] In addition, if Figure 4A , 4B As shown, the notch 70 of the insulating sheet 60 includes a third side 63, a seventh side 67, and a second corner portion 72. When the insulating sheet 60 is unfolded, the seventh side 67 is continuous with the first side 61 and forms a fourth angle θ4 (=90 degrees) with respect to the third side 63. It should be noted that the fourth angle θ4 can be less than 90 degrees (θ4≤90).

[0052] In addition, the second corner portion 72 is provided at the intersection of the third side 63 and the seventh side 67. In the present embodiment, the second corner portion 72 is configured as a sixth side 66 which is connected to the other end of the third side 63 and one end of the seventh side 67 and is in a straight line with respect to the third side 63 at a third angle θ3 (=45 degrees). It should be noted that the third angle θ3 is not limited to 45 degrees, and may be greater than 0 degrees and smaller than the fourth angle θ4 (0<θ3<θ4).

[0053] like Figure 4A , 4BAs shown, in the first corner portion 71, a portion 71a where one end of the third side 63 contacts one end of the fifth side 65 is sometimes referred to as a first portion 71a. A portion 71b where the other end of the fifth side 65 contacts one end of the fourth side 64 is sometimes referred to as a second portion 71b. In addition, a portion 71c where the other end of the fourth side 64 contacts one end of the first side 61 is sometimes referred to as a third portion 71c.

[0054] In the second corner portion 72, a portion 72a where the other end of the third side 63 contacts one end of the sixth side 66 is sometimes referred to as a fourth portion 72a. A portion 72b where the other end of the sixth side 66 contacts one end of the seventh side 67 is sometimes referred to as a fifth portion 72b. In addition, a portion 72c where the other end of the seventh side 67 contacts one end of the first side 61 is sometimes referred to as a sixth portion 72c.

[0055] like Figures 3A to 3D As shown in the figure, when the insulating sheet 60 is accommodated in the slot 31, the notch 70, that is, the third side 63, the fourth side 64, the seventh side 67, the first corner portion 71 and the second corner portion 72 protrude from the axial end surface of the stator core 30 and are arranged outside the slot 31. In addition, in this state, the first corner portion 71 of the insulating sheet 60 is arranged on the radially outer side in the stator 100. The second corner portion 72 of the insulating sheet 60 is arranged on the side close to the front end of the stator core 30, that is, arranged on the radially inner side in the stator 100.

[0056] It should be noted that if Figure 4A As shown in FIG. 1 , the insulating sheet 60 has an asymmetric shape with respect to the center line O1-O2 extending in the axial direction. Figure 2 As shown, the shape of the slot 31 is different between the radially inner side and the radially outer side. That is, the asymmetry of the shape of the insulating sheet 60 about the center line O1-O2 extending in the axial direction can be appropriately changed according to the shape of the slot 31. That is, the shape of the insulating sheet 60 may be symmetrical about the center line O1-O2.

[0057] It should be noted that the insulating sheet 60 protruding to the outside of the slot 31 may be further bent to cover the axial end surface of the coil 40 .

[0058] [Effects, etc.]

[0059] As described above, the insulating sheet 60 according to the present embodiment is attached to the stator core 30 of the motor 1000 .

[0060] The insulating sheet 60 is an H-shaped sheet in a plan view, in which indentations 70 facing inward are formed on two opposing first sides 61 .

[0061] The notch 70 has a first corner portion 71 and a second corner portion 72. The first corner portion 71 is formed at the intersection of the third side 63 and the fourth side 64. The third side 63 is parallel to the first side 61 and is located inside the first side 61. The fourth side 64 is inclined at a first angle θ1 relative to the third side 63.

[0062] The first corner portion 71 has a fifth side 65 that is inclined at a second angle θ2 smaller than 90 degrees with respect to the third side 63 in a plan view.

[0063] In addition, the stator 100 of the present embodiment has at least a stator core 30, a slot 31, a coil 40, and an insulating sheet 60. The stator core 30 has an annular yoke 20 and a plurality of teeth 10 arranged at equal angle intervals on the inner surface of the yoke 20. The slot 31 is a space surrounded by the inner surface of the adjacent stator core 30. The coil 40 is respectively mounted on the plurality of teeth 10 with the insulating sheet 60 interposed therebetween.

[0064] The insulating sheet 60 is accommodated in the slot 31 in a bent state. The notch 70 of the insulating sheet 60 protrudes from the axial end surface of the stator core 30 and is arranged outside the slot 31 .

[0065] The insulation distance (creeping distance) between the axial end surface of the stator core 30 and the portion of the coil 40 that contacts the fifth side 65 (edge) of the first corner portion is constant.

[0066] According to the present embodiment, it is possible to suppress the size of the stator 100 and thus the motor 1000 from increasing in the axial direction while ensuring the insulation distance between the coil 40 and the stator core 30 . This will be described further.

[0067] Figure 5 A schematic diagram comparing a main part of an insulating sheet according to an embodiment and a main part of an insulating sheet according to a comparative example is shown. Figure 5 The figure on the left side of FIG. 1 is an insulating sheet 60 of the present embodiment, and the figure on the right side is an insulating sheet 80 of a comparative example. The insulating sheet 80 corresponds to the insulating thin article disclosed in Patent Document 1.

[0068] The coil 40 is wound around the stator core 30 with the insulating sheet 60 and the divided insulators 51 or the divided insulators 52 interposed therebetween.

[0069] In the first corner portion 71 of the insulating sheet 60, the insulation distance between the coil 40 and the stator core 30 is equivalent to the distance between the insulating sheet 60 and the boundary of the coil 40 exposed from the insulating sheet 60, that is, the fifth side 65 of the insulating sheet 60 and the axial end face of the stator core 30. This distance, that is, the insulation distance Figure 5The left side of is shown by line segments A1-A2, B1-B2, and C1-C2. It should be noted that the length of the line segment B1-B2 is equivalent to the sum of the length of the line segment extending from point B1 located at the extension of the fourth side 64 parallel to the third side 63 and reaching the fifth side 65 and the length of the line segment extending from the fifth side 65 parallel to the fourth side 64 and reaching the axial end face of the stator core 30. In addition, the length of the line segment C1-C2 is equivalent to the sum of the length of the line segment extending from point C1 located at the extension of the fourth side 64 parallel to the third side 63 and reaching the fifth side 65 and the length of the line segment extending from the fifth side 65 parallel to the fourth side 64 and reaching the axial end face of the stator core 30.

[0070] like Figure 5 As shown on the left side of FIG. 1 , in the insulating sheet 60 of the present embodiment, the fifth side 65 constituting the first corner portion 71 is inclined at a second angle θ2 (θ2<90) smaller than the first angle θ1 with respect to the third side 63. Therefore, the aforementioned insulating distance in the first corner portion 71 becomes constant.

[0071] On the other hand, Figure 5 In the notch 90 of the insulating sheet 80 of the comparative example shown on the right side of FIG, the third side 83 and the fourth side 84 intersect orthogonally, so the first corner portion 91 forms a right angle. It should be noted that the first side 81 of the insulating sheet 80 corresponds to the first side 61 of the insulating sheet 60, and the second side 82 of the insulating sheet 80 corresponds to the second side 62 of the insulating sheet 60.

[0072] Therefore, in the first corner portion 91, the insulation distance between the coil 40 and the stator core 30 becomes Figure 5 The length of the line segment D1-D2 shown on the right side of Figure 5 In the insulating sheet 80 shown on the right side of Figure 5 The height in the axial direction changes continuously like the first corner portion 71 of the insulating sheet 60 shown on the left side of FIG. Therefore, in order to ensure the necessary insulation distance, the length of the line segment D1-D2 is longer than the length of the line segment A1-A2 by ΔH. In addition, although not shown in the figure, the same state also occurs in the notch 90 provided in the other axial direction.

[0073] That is, when the insulating sheet 80 is mounted in the slot 31, the axial length of the stator 100 is longer by 2ΔH than in the present embodiment. Therefore, the axial dimensions of the stator 100 and the motor 1000 are increased, which hinders the miniaturization of the stator 100 and the motor 1000.

[0074] On the other hand, according to this embodiment, the size of the stator 100 and the motor 1000 can be suppressed from increasing in the axial direction, and the motor 1000 can be miniaturized. In addition, the insulation distance between the coil 40 and the stator core 30 can be ensured, so the reliability of the motor 1000 during operation can be suppressed from decreasing.

[0075] It should be noted that if Figure 4B As shown, the sixth side 66 of the insulating sheet 60 constituting the second corner portion 72 also forms a third angle θ3 with respect to the third side 63. That is, the insulating sheet 60 in the second corner portion 72 can also ensure the insulation distance between the coil 40 and the stator core 30 while suppressing the size of the stator 100 and thus the motor 1000 from increasing in the axial direction.

[0076] The fifth side 65 constituting the first corner portion 71 is preferably a straight line in a plan view. In this way, as described above, the insulation distance between the coil 40 and the stator core 30 can be ensured to be greater than a specified value within the entire range of the first corner portion 71. For the same reason, the sixth side 66 constituting the second corner portion 72 is preferably a straight line in a plan view.

[0077] It should be noted that, as described above, the second angle θ2 and the third angle θ3 are not limited to 45 degrees, respectively. The preferred ranges of the second angle θ2 and the third angle θ3 are 30 degrees or more and 60 degrees or less (30≤θ2≤60, 30≤θ3≤60), respectively.

[0078] As the second angle θ2 and the third angle θ3 increase or decrease from 45 degrees, the insulation distance decreases, and therefore the length of the insulating sheet 60 needs to be increased and the height of the insulating member 50 (divided insulating members 51 and 52) needs to be increased accordingly to maintain the insulation distance. Therefore, the total length of the assembly portion of the stator 100, that is, the portion where the insulating member 50, the stator core 30, and the insulating sheet 60 are integrated, increases in the axial direction, resulting in an increase in the size of the motor 1000.

[0079] Therefore, by setting the second angle θ2 and the third angle θ3 to 30 degrees or more and 60 degrees or less, the insulation distance between the coil 40 and the stator core 30 can be ensured. In addition, the increase in the length of the insulating sheet 60 and the height of the insulating member 50 can be suppressed, and the motor 1000 can be miniaturized.

[0080] In addition, the second angle θ2 is more preferably 45 degrees. In this way, as described above, the insulation distance between the coil 40 and the stator core 30 can be constant and maximized throughout the entire range of the first corner portion 71. For the same reason, in the second corner portion 72, the third angle θ3 is more preferably 45 degrees.

[0081] It should be noted that, in the first corner portion 71, the second angle θ2 may be smaller than the first angle θ1. In this way, the aforementioned insulation distance can be ensured while reducing the axial height of the first corner portion 71. For the same reason, in the second corner portion 72, the third angle θ3 may be smaller than the fourth angle θ4.

[0082] The motor 1000 of the present embodiment includes at least a stator 100 and a rotor 200 provided at a predetermined interval in the radial direction from the stator 100 .

[0083] According to this embodiment, the stator 100 and thus the motor 1000 can be prevented from increasing in size in the axial direction while ensuring the insulation distance between the coil 40 and the stator core 30. This can reduce the size of the motor 1000 and improve reliability during operation.

[0084] <Modification>

[0085] Figure 6 FIG. 2 is a top view of a main part of an insulating sheet of a modified example. Figure 6 In the present invention, the same parts as those in Implementation 1 are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0086] Figure 6 The insulating sheet 60 of the present modification shown in the figure has a fifth side 65a constituting the first corner portion 71 which is rounded to have a curvature radius (first curvature radius) R. Figure 4A , 4B The insulating sheet 60 of the illustrated embodiment is different.

[0087] The insulating sheet 60 may also be constructed in this way, which can achieve the same effect as the structure shown in the embodiment. That is, it is possible to ensure the insulation distance between the coil 40 and the stator core 30 while suppressing the size of the stator 100 and the motor 1000 from increasing in the axial direction. In this way, the motor 1000 can be miniaturized and the reliability during operation can be improved. It should be noted that the fifth side 65a may also be in the shape of an elliptical arc.

[0088] It should be noted that, although not shown, in the second corner portion 72 , the sixth side 66 may be in a circular arc shape or an elliptical arc shape having a curvature radius R.

[0089] Including this variation, the stator 100 in the present application specification uses the insulating sheet 60 so that the insulation distance between the axial end surface of the stator core 30 and the portion of the coil 40 that abuts the edge of the first corner portion 71 (the fifth side 65 or the fifth side 65a) becomes constant.

[0090] Similarly, the stator 100 is configured by using the insulating sheet 60 so that the insulation distance between the portion where the axial end surface of the stator core 30 and the edge (sixth side 66 ) of the second corner portion 72 of the coil 40 abuts against each other is constant.

[0091] (Other Implementations)

[0092] In the present specification, the motor 1000 is shown as an example of a three-phase AC motor, but it is not particularly limited to this. For example, the motor 1000 may also be a DC motor. In addition, the number of poles of the motor 1000 (the total number of poles of the magnet 230), the number of slots 31, and the number of phases of the motor 1000 may also be appropriately changed according to the purpose of the motor 1000.

[0093] The stator core 30 and the rotor core 210 are each made of a magnetic material, and their materials are appropriately selected according to the specifications of the motor 1000 .

[0094] The structure of the present invention is described above based on the embodiments and modified examples, but the present invention is not limited to the above-mentioned embodiments and modified examples. For example, it can also be an insulating sheet formed by appropriately combining the structures of the parts of the insulating sheets of the embodiments and modified examples. In addition, the materials, numerical values, etc. described in the embodiments are only examples of preferred contents and are not limited to them. Moreover, the structure of the insulating sheet can be appropriately changed within the scope of the technical idea of ​​the present invention.

[0095] Industrial Applicability

[0096] The insulating sheet of the present invention is useful because it can suppress the size of the stator and thus the motor from increasing in the axial direction while ensuring the insulation distance between the coil and the stator core.

[0097] Description of Reference Numerals

[0098] 10 teeth

[0099] 20 Yoke

[0100] 21 Split Yoke

[0101] 30 stator core

[0102] 31 slots

[0103] 40 Coil

[0104] 50 Insulation

[0105] 51, 52 Split insulation parts

[0106] 60 Insulation sheet

[0107] 61 First Side

[0108] 62 Second Side

[0109] 63 The Third Side

[0110] 64 The Fourth Side

[0111] 65 The Fifth Side

[0112] 65a The Fifth Side

[0113] 66 Sixth Side

[0114] 67 The Seventh Side

[0115] 70 Gap

[0116] 71 First corner

[0117] 71a Part I

[0118] 71b Part 2

[0119] 71c Part 3

[0120] 72 Second corner

[0121] 72a Part 4

[0122] 72b Part 5

[0123] 72c Part VI

[0124] 80 Insulation sheet

[0125] 81 First Side

[0126] 82 Second Side

[0127] 83 The Third Side

[0128] 84 The Fourth Side

[0129] 90 Gap

[0130] 91 First Corner

[0131] 100 Stator

[0132] 200 rotor

[0133] 210 Rotor core

[0134] 220 Rotation axis

[0135] 230 Magnet

[0136] 1000 Motor

[0137] θ1~θ4 are first to fourth angles.

Claims

1. An insulating sheet mounted on a stator of a motor, The insulating sheet is characterized in that The insulating sheet is a sheet having an H-shape in a plan view and having notches facing inwards formed on two opposing first sides. The notch has a first corner portion and a second corner portion, The first corner portion is formed continuously with a third side parallel to the first side and located on the inner side of the first side, and the first side, or the first corner portion is formed at an intersection of a third side parallel to the first side and located on the inner side of the first side and a fourth side continuous with the first side and inclined at a first angle with respect to the third side, At least the first corner portion is rounded to have a first radius of curvature, or has a fifth side inclined at a second angle smaller than 90 degrees with respect to the third side in a plan view.

2. The insulating sheet according to claim 1, characterized in that: The second angle is smaller than the first angle.

3. The insulating sheet according to claim 2, characterized in that: The second angle is greater than or equal to 30 degrees and less than or equal to 60 degrees.

4. The insulating sheet according to claim 3, characterized in that: The second angle is 45 degrees.

5. The insulating sheet according to claim 1, characterized in that: The fifth side is a straight line when viewed from above.

6. A stator of a motor, the stator having the insulating sheet according to any one of claims 1 to 5 installed thereon, The stator of the motor is characterized in that The stator has at least: a stator core having an annular yoke and a plurality of teeth disposed on an inner surface of the yoke at intervals spaced apart from each other at equal angular intervals; a slot which is a space surrounded by the inner surface of the adjacent stator core; and coils, each of which is mounted on the plurality of teeth with the insulating sheet interposed therebetween, When the longitudinal direction of the rotating shaft of the motor is defined as the axial direction, The insulating sheet is received in the slot in a bent state. The notch protrudes from the axial end surface of the stator core and is arranged outside the slot. An insulation distance between the axial end surface of the stator core and a portion of the coil that contacts an edge of the first corner portion is constant.

7. A motor, characterized in that: The motor at least comprises: The stator according to claim 6; and The rotor is provided at a predetermined interval from the stator.

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