Stator isolation structure

Abstract

This provides a stator insulation structure that ensures insulation between the coil and the stator core without creating a gap at the connection point of the two-part insulating cap, and without the cap falling off the stator core during operation. [Solution] A stator insulation structure in which the surface of a protruding magnetic pole 12 with a square cross-section in the stator core 10 is insulated by a first insulating cap 110 and a second insulating cap 120, wherein the convex portion 110a of the first insulating cap 110 and the concave portion 120b of the second insulating cap 120 overlap, and the convex portion 120a of the second insulating cap 120 and the concave portion 110b of the first insulating cap 110 overlap, thereby insulating the area around the protruding magnetic pole 12.

Description

Technical Field

[0001] This invention relates to a stator insulation structure, and particularly to a structure that reliably insulates the protruding poles of a stator using an insulating cap.

Background Art

[0002] A stator core is composed of a metal called laminated electromagnetic steel sheets. Therefore, when winding a coil around the protruding poles of the stator core, it is necessary to arrange an insulating material on the surface of the protruding poles. As an insulating material for insulating the surface of this type of stator core, an insulating material made of resin called an insulating cap is known. Regarding the structure for insulating the protruding poles of a stator core using an insulating cap, a technique related to Patent Document 1 has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 discloses a split insulating cap that is divided into two in the stacking length direction of the stator core. In this split insulating cap, the two split insulating caps are joined together at a position half the length of the stator core in the stacking direction.

[0005] Actually, due to individual differences in the sizes of the stator core or the insulating cap, a gap may occur at the connection position of the split insulating cap. Since there is a risk of the metal of the stator core being exposed and short-circuiting due to this gap, it is necessary to sandwich insulating paper between the stator core and the split insulating cap, which is troublesome work. It is also possible to block the above-mentioned gap using insulating tape, but there are also drawbacks such as the time-consuming process of attaching the tape and the reduction of the winding space factor of the coil due to the thickness of the tape.

[0006] During the process, the segmented insulating caps tended to fall off due to their own weight, so it was necessary to temporarily fix them in place with a jig or tape until the coil was wound. A structure in which the two segmented insulating caps overlapped at their connection points could be considered, but this would result in thin walls at the overlapping tips, potentially leading to various problems such as injection molding defects, cracking, and insufficient dielectric strength, making it difficult to implement.

[0007] The present invention aims to provide a stator insulation structure that ensures insulation between the coil and the stator core without creating a gap at the connection position of the two-part insulating cap, and without the cap falling off the stator core during operation. [Means for solving the problem]

[0008] The stator insulation structure according to this invention is a stator insulation structure that insulates the surface of a protruding magnetic pole with a square cross-section in the stator core with a first insulating cap and a second insulating cap, wherein the first insulating cap is formed in a U-shape of insulating material with a first piece provided on one side in the longitudinal direction, a second piece provided on the other side in the longitudinal direction, and a third piece sandwiched between the first and second pieces, the first piece has either a convex portion or a concave portion on the opposite side of the surface facing the protruding magnetic pole, the second piece has either a convex portion or a concave portion on the surface facing the protruding magnetic pole, and the second insulating cap is formed in a U-shape of insulating material with a first piece provided on one side in the longitudinal direction, a second piece provided on the other side in the longitudinal direction The insulating cap is formed in a U-shape from insulating material by a first piece provided on one side, a second piece provided on the other side in the longitudinal direction, and a third piece sandwiched between the first and second pieces. The first piece has either a convex portion or a concave portion on the side opposite to the surface facing the protruding magnetic pole, and the second piece has either a convex portion or a concave portion on the surface facing the protruding magnetic pole. The convex portion of the first insulating cap and the concave portion of the second insulating cap overlap, and the convex portion of the second insulating cap and the concave portion of the first insulating cap overlap, and the first insulating cap and the second insulating cap overlap to form a rectangular insulating cap, thereby insulating the area around the protruding magnetic pole.

[0009] In the stator insulation structure according to this invention, the area occupied by the protrusion on the first piece of the first insulating cap may be smaller than the opening area of ​​the recess on the second piece of the second insulating cap, and the area occupied by the protrusion on the first piece of the second insulating cap may be smaller than the opening area of ​​the recess on the second piece of the first insulating cap.

[0010] In the stator insulation structure according to this invention, the second piece of the first insulating cap may be provided with a space between it and the protruding magnetic pole to accommodate the first piece of the second insulating cap, and the second piece of the second insulating cap may be provided with a space between it and the protruding magnetic pole to accommodate the first piece of the first insulating cap.

[0011] In the stator insulation structure according to this invention, the volume of the first piece of the first insulating cap is formed to be smaller than the volume of the second piece of the second insulating cap, and the volume of the first piece of the second insulating cap is formed to be smaller than the volume of the second piece of the first insulating cap. That's fine.

[0012] The first insulating cap and the second insulating cap are further provided with winding collapse prevention walls, and at least one gap may be provided in the winding collapse prevention wall as a winding path.

[0013] In the stator insulation structure according to this invention, the first insulating cap and the second insulating cap may be configured to have the same shape. [Effects of the Invention]

[0014] According to the stator insulation structure of this invention, no gap is created at the connection position of the two insulating caps, and insulation between the coil and the stator core can be ensured without the caps falling off the stator core during operation. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing the stator insulation structure in Embodiment 1 in an exploded state. [Figure 2]It is a perspective view showing the stator insulation structure in Embodiment 1 in a disassembled state. [Figure 3] It is a perspective view showing the stator insulation structure in Embodiment 1. [Figure 4] It is a plan view showing the stator insulation structure in Embodiment 1. [Figure 5] It is a cross-sectional view showing a cross-section along the V-V line in FIG. 4. [Figure 6] It is a configuration diagram showing the front, plan, side, and bottom configurations of the stator insulation structure in Embodiment 1. [Figure 7] It is a cross-sectional view showing another example of the cross-section in FIG. 5.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the stator insulation structure of the present invention will be described with reference to the drawings. In each figure, the same reference numerals are assigned to the same parts. Embodiment 1. First, the arrangement of each part of the stator insulation structure in Embodiment 1 will be described with reference to FIGS. 1 and 2. FIGS. 1 and 2 are perspective views showing the stator insulation structure in Embodiment 1 in a disassembled state.

[0017] The stator insulation structure of Embodiment 1 is configured to cover the surface of the coil winding portion in the stator core 10 with the first insulation cap 110 and the second insulation cap 120, thereby ensuring the insulation between the coil and the stator core 10. The stator core 10 includes a back yoke 11, a salient pole 12, and a salient pole surface 13. Here, for simplicity of explanation of the stator insulation structure, only one magnetic pole, which is the basic unit of the stator core 10, is shown. In an environment actually used in a rotating electric machine such as a motor, the stator core 10 is configured to be annular as a whole by a plurality of magnetic poles around a rotor (not shown).

[0018] The back yoke 11 is a magnetic path configured in an annular shape at the outermost periphery of the stator core 10. The protruding pole 12 is a pole that protrudes in a quadrangular prism shape inward in the radial direction from the annular back yoke 11. A coil (not shown) is wound around the protruding pole 12. The protruding pole 12 has a quadrangular cross section and is configured with four orthogonal sides. Note that, regarding the cross section of the protruding pole 12, even if the corners of the quadrangle are chamfered, it is treated as a quadrangle. The protruding pole surface 13 is the end face on the inner side in the radial direction of the protruding pole 12 and serves as a path for magnetic flux between it and a rotor (not shown).

[0019] The first insulating cap 110 is formed in a U shape from an insulating material such as resin, by a first piece 111 provided on one side in the longitudinal direction, a second piece 112 provided on the other side in the longitudinal direction, and a third piece 113 sandwiched between the first piece 111 and the second piece 112. As the insulating material, a fiber-reinforced plastic reinforced with glass fiber or carbon fiber etc. centered on resin can be used. When using fiber-reinforced plastic, it becomes possible to enhance heat resistance and mechanical strength. Either a convex portion 110a or a concave portion 110b is provided on the opposite surface of the surface of the first piece 111 facing the protruding pole 12. Either the other of the convex portion 110a and the concave portion 110b is provided on the surface of the second piece 112 facing the protruding pole 12. Here, as a specific example, a case where the convex portion 110a is provided on the first piece 111 and the concave portion 110b is provided on the second piece 112 is taken. A winding collapse prevention wall 114 is provided between the second piece 112 and the third piece 113 to prevent the coil from collapsing and to prevent the coil from contacting the back yoke 11 and the protruding pole surface 13.

[0020] The second insulating cap 120 is formed in a U-shape from an insulating material such as resin, comprising a first piece 121 provided on one side in the longitudinal direction, a second piece 122 provided on the other side in the longitudinal direction, and a third piece 123 sandwiched between the first piece 121 and the second piece 122. The first piece 121 has either a convex portion 120a or a concave portion 120b on the side opposite to the surface facing the protruding magnetic pole 12. The second piece 122 has either a convex portion 120a or a concave portion 120b on the surface facing the protruding magnetic pole 12. Here, we will take the case where a protrusion 120a is provided on the first piece 121 and a recess 120b is provided on the second piece 122 as a specific example. The second piece 122 and the third piece 123 are provided with a coil unwinding prevention wall 124 to prevent the coil from unwinding and to prevent the coil from coming into contact with the back yoke 11 and the protruding magnetic pole surface 13.

[0021] The recess 110b of the first insulating cap 110 may be any recess that can overlap with the protrusion 120a of the second insulating cap 120, but it may also be a through hole. Similarly, the recess 120b of the second insulating cap 120 may be any recess that can overlap with the protrusion 110a of the first insulating cap 110, but it may also be a through hole. Here, the case where recesses 110b and recesses 120b are through holes is illustrated as a specific example. In this embodiment, a through hole is a type of recess.

[0022] The arrangement of each part in the completed state of the stator insulation structure in Embodiment 1 will be described below with reference to Figures 3 to 6. Figure 3 is a perspective view showing the stator insulation structure in Embodiment 1. Figure 4 is a plan view showing the stator insulation structure in Embodiment 1. Figure 5 is a cross-sectional view showing a cross-section along the VV line in Figure 4. Figure 6 is a configuration diagram showing the front, top, side, and bottom views of the stator insulation structure in Embodiment 1. Here, Figure 6(a) shows the front view of the stator insulation structure, Figure 6(b) shows the side view of the stator insulation structure, Figure 6(c) shows the top view of the stator insulation structure, and Figure 6(d) shows the bottom view of the stator insulation structure.

[0023] In the first insulating cap 110, the protruding ends of the first piece 111 and the second piece 112 are moved toward the protruding magnetic pole 12, and in the second insulating cap 120, the protruding ends of the first piece 121 and the second piece 122 are moved toward the protruding magnetic pole 12, so that the first insulating cap 110 and the second insulating cap 120 overlap at the position of the protruding magnetic pole 12. As a result, the convex portion 110a of the first insulating cap 110 and the concave portion 120b of the second insulating cap 120 overlap. The overlapping of the convex portion 110a of the first insulating cap 110 and the concave portion 120b of the second insulating cap 120 is shown in Figures 3, 4, 5, and 6(c). Similarly, the protrusion 120a of the second insulating cap 120 and the recess 110b of the first insulating cap 110 overlap. The overlapping of the protrusion 120a of the second insulating cap 120 and the recess 110b of the first insulating cap 110 is shown in Figures 5 and 6(d). As described above, the first piece 111 of the first insulating cap 110 and the second piece 122 of the second insulating cap 120, and the first piece 121 of the second insulating cap 120 and the second piece 112 of the first insulating cap 110 are joined together in a manner called snap-fit. The protrusion 110a of the first piece 111 of the first insulating cap 110 has an inclined surface at the tip that contacts the second piece 122 of the second insulating cap 120, and a vertical surface at the rear end to prevent it from coming off. Similarly, the protrusion 120a of the first piece 121 of the second insulating cap 120 has an inclined surface at the tip that contacts the second piece 112 of the first insulating cap 110, and a vertical surface at the rear end to prevent it from coming off. Due to the overlapping of these irregularities, the first insulating cap 110 and the second insulating cap 120 will not fall off during the work before winding the coil, and it is possible to ensure insulation between the coil (not shown) and the stator core 10.

[0024] As shown in Figure 6(c), the area occupied by the protrusion 110a of the first insulating cap 110 is smaller than the opening area of ​​the recess 120b of the second insulating cap 120. Similarly, as shown in Figure 6(d), the area occupied by the protrusion 120a of the second insulating cap 120 is smaller than the opening area of ​​the recess 110b of the first insulating cap 110. As a result, even if there are subtle differences in the size of the protruding magnetic pole 12, the size of the first insulating cap 110, and the size of the second insulating cap 120, the difference in area between the protrusion 110a and the recess 120b ensures that the protrusion 110a of the first insulating cap 110 and the recess 120b of the second insulating cap 120 overlap reliably and without problems. Similarly, the difference in area between the protrusion 120a and the recess 110b ensures that the protrusion 120a of the second insulating cap 120 and the recess 110b of the first insulating cap 110 overlap reliably and without problems. As a result, it becomes possible to ensure insulation between the coil (not shown) and the stator core 10.

[0025] As shown in Figures 2 and 5, the second piece 122 of the second insulating cap 120 is provided with a space 122c (see Figure 2) between it and the protruding magnetic pole 12 to accommodate the first piece 111 of the first insulating cap 110. Similarly, as shown in Figure 5, the second piece 112 of the first insulating cap 110 is provided with a space 112c between it and the protruding magnetic pole 12 to accommodate the first piece 121 of the second insulating cap 120. As a result, the first piece 111 of the first insulating cap 110 can be accommodated between the second piece 122 and the protruding magnetic pole 12 without the second piece 122 of the second insulating cap 120 being deformed. Similarly, the first piece 121 of the second insulating cap 120 can be accommodated between the second piece 112 and the protruding magnetic pole 12 without the second piece 112 of the first insulating cap 110 being deformed.

[0026] As shown in Figures 2 and 5, the second piece 122 of the second insulating cap 120 has a space 122c (see Figure 2) between it and the protruding magnetic pole 12 for accommodating the first piece 111 of the first insulating cap 110. The volume of the first piece 111 of the first insulating cap 110 is formed to be smaller than the volume of the second piece 122 of the second insulating cap 120 so that it can be accommodated in space 122c. Similarly, as shown in Figure 5, the second piece 112 of the first insulating cap 110 has a space 112c between it and the protruding magnetic pole 12 for accommodating the first piece 121 of the second insulating cap 120. The volume of the first piece 121 of the second insulating cap 120 is formed to be smaller than the volume of the second piece 112 of the first insulating cap 110 so that it can be accommodated in space 112c. Here, the volume of a piece is determined by the product of the width, length, and thickness of the piece. Due to this difference in volume, the first piece 111 of the first insulating cap 110 can be reliably accommodated in the space 122c provided in the second piece 122 of the second insulating cap 120. Similarly, the first piece 121 of the second insulating cap 120 can be reliably accommodated in the space 112c provided in the second piece 112 of the first insulating cap 110.

[0027] The first insulating cap 110 and the second insulating cap 120 are constructed to have the same shape. In other words, the second insulating cap 120 can be realized by rotating the first insulating cap 110 by 180°, using the first insulating cap 110 as a reference. Therefore, one type of insulating cap can be used as both the first insulating cap 110 and the second insulating cap 120, which reduces manufacturing costs compared to manufacturing two different types of insulating caps. Furthermore, the first insulating cap 110 and the second insulating cap 120 can be manufactured with the same precision.

[0028] Below, other examples of the arrangement of each part in the completed state of the stator insulation structure in Embodiment 1 will be described with reference to Figure 7. Figure 7 is a cross-sectional view showing another example of the cross-section of Figure 5. In Figure 7, in the first insulating cap 110, the first piece 111 has a recess 110b on the opposite side of the surface facing the protruding magnetic pole 12, and the second piece 112 has a protrusion 110a on the surface facing the protruding magnetic pole 12. In the second insulating cap 120, the first piece 121 has a recess 120b on the opposite side of the surface facing the protruding magnetic pole 12, and the second piece 122 has a protrusion 120a on the surface facing the protruding magnetic pole 12. Note that recesses 110b and 120b may be through holes, in addition to the depressions shown in Figure 7.

[0029] The first insulating cap 110 and the second insulating cap 120 are positioned so that they overlap at the location of the protruding magnetic pole 12. As a result, the recess 110b of the first insulating cap 110 and the protrusion 120a of the second insulating cap 120 overlap. Similarly, the recess 120b of the second insulating cap 120 and the protrusion 110a of the first insulating cap 110 overlap. As described above, the first piece 111 of the first insulating cap 110 and the second piece 122 of the second insulating cap 120, and the first piece 121 of the second insulating cap 120 and the second piece 112 of the first insulating cap 110 are joined together in a manner called snap-fit.

[0030] The protrusion 110a of the second piece 112 of the first insulating cap 110 has an inclined surface at the tip that contacts the first piece 121 of the second insulating cap 120, and a vertical surface at the rear end to prevent it from coming off. Similarly, the protrusion 120a of the second piece 122 of the second insulating cap 120 has an inclined surface at the tip that contacts the first piece 111 of the first insulating cap 110, and a vertical surface at the rear end to prevent it from coming off. Due to the overlapping of these irregularities, the first insulating cap 110 and the second insulating cap 120 will not fall off during the work before winding the coil, and it is possible to ensure insulation between the coil (not shown) and the stator core 10.

[0031] The first insulating cap 110 is provided with a coil collapse prevention wall 114 to prevent the coil from collapsing, and the second insulating cap 120 is also provided with a coil collapse prevention wall 124 to prevent the coil from collapsing. Here, at least one of the coil collapse prevention walls 114 and 124 is provided with at least one gap in the wall as a winding path 130. When winding a coil around a protruding magnetic pole 12 insulated by a first insulating cap 110 and a second insulating cap 120, the coil wire is either drawn in from the outside through the winding path 130, or drawn out to the outside through the winding path 130.

[0032] [Effects of Embodiment 1] The stator insulation structure of Embodiment 1 described above can achieve the following effects.

[0033] In the stator insulation structure of Embodiment 1, when the surface of the protruding magnetic pole 12, which has a square cross-section, is insulated in the stator core 10 by the first insulating cap 110 and the second insulating cap 120, the first insulating cap 110 is formed in a U-shape from insulating material by a first piece 111 provided on one side in the longitudinal direction, a second piece 112 provided on the other side in the longitudinal direction, and a third piece 113 sandwiched between the first piece 111 and the second piece 112. The first piece 111 is provided with either a convex portion 110a or a concave portion 110b on the side opposite to the surface facing the protruding magnetic pole 12, and the second piece 112 is provided with the other of either a convex portion 110a or a concave portion 110b on the surface facing the protruding magnetic pole 12. The second insulating cap 120 is formed in a U-shape from insulating material by a first piece 121 provided on one side in the longitudinal direction, a second piece 122 provided on the other side in the longitudinal direction, and a third piece 123 sandwiched between the first piece 121 and the second piece 122. The first piece 121 has either a convex portion 120a or a concave portion 120b on the side opposite to the surface facing the protruding magnetic pole 12, and the second piece 122 has either a convex portion 120a or a concave portion 120b on the surface facing the protruding magnetic pole 12. Here, the protrusion 110a of the first insulating cap 110 and the recess 120b of the second insulating cap 120 overlap, and the protrusion 120a of the second insulating cap 120 and the recess 110b of the first insulating cap 110 also overlap, so that the first insulating cap 110 and the second insulating cap 120 overlap to form a rectangular insulating cap body, thereby insulating the area around the protruding magnetic pole 12. As a result, no gap is created at the connection position of the two insulating caps, the first insulating cap 110 and the second insulating cap 120, and it becomes possible to ensure insulation between the coil and the stator core without the two insulating caps falling off the stator core during operation.

[0034] In the stator insulation structure of Embodiment 1, the area occupied by the protrusion 110a on the first piece 111 of the first insulating cap 110 is smaller than the opening area of ​​the recess 120b on the second piece 122 of the second insulating cap 120, and the area occupied by the protrusion 120a on the first piece 121 of the second insulating cap 120 is smaller than the opening area of ​​the recess 110b on the second piece 112 of the first insulating cap 110. As a result, even if there are subtle differences between the sizes of the protruding magnetic pole 12, the first insulating cap 110, and the second insulating cap 120, these differences are absorbed by the difference in the area of ​​the protrusions and recesses. Due to the difference in area between the protrusions 110a and the recess 120b, the protrusions 110a and the recess 120b overlap reliably and without problems, and similarly, the protrusions 120a and the recess 110b overlap reliably and without problems.

[0035] In the stator insulation structure of Embodiment 1, the second piece 112 of the first insulating cap 110 is provided with a space 112c between it and the protruding magnetic pole 12 to accommodate the first piece 121 of the second insulating cap 120, and the second piece 122 of the second insulating cap 120 is provided with a space 122c between it and the protruding magnetic pole 12 to accommodate the first piece 111 of the first insulating cap 110. As a result, the first piece 111 of the first insulating cap 110 can be accommodated between the second piece 122 and the protruding magnetic pole 12 without the second piece 122 of the second insulating cap 120 being deformed. Similarly, the first piece 121 of the second insulating cap 120 can be accommodated between the second piece 112 and the protruding magnetic pole 12 without the second piece 112 of the first insulating cap 110 being deformed. As a result, it becomes possible to ensure insulation between the coil (not shown) and the stator core 10.

[0036] In the stator insulation structure of Embodiment 1, the first piece 111 of the first insulating cap 110 is formed smaller than the second piece 122 of the second insulating cap 120 so that it can be accommodated in the space 122c, and the first piece 121 of the second insulating cap 120 is formed smaller than the second piece 112 of the first insulating cap 110 so that it can be accommodated in the space 112c. This ensures that the first piece 111 of the first insulating cap 110 is securely accommodated in the space 122c provided in the second piece 122 of the second insulating cap 120. Similarly, the first piece 121 of the second insulating cap 120 is securely accommodated in the space 112c provided in the second piece 112 of the first insulating cap 110.

[0037] In the stator insulation structure of Embodiment 1, the first insulating cap 110 and the second insulating cap 120 are configured to have the same shape; that is, the second insulating cap 120 can be realized by rotating the first insulating cap 110 by 180° with respect to the first insulating cap 110. Therefore, one type of insulating cap can be used as both the first insulating cap 110 and the second insulating cap 120, which reduces manufacturing costs compared to manufacturing two different types of insulating caps. Furthermore, the first insulating cap 110 and the second insulating cap 120 can be manufactured with the same precision. As a result, the two insulating caps, the first insulating cap 110 and the second insulating cap 120, can be reliably connected around the protruding magnetic pole 12. [Explanation of Symbols]

[0038] 10 Stator core, 11 Back yoke, 12 Protruding magnetic pole, 13 Protruding magnetic pole surface, 110 First insulating cap, 110a Protrusion, 110b Recess, 111 First piece, 112 Second piece, 112c Space, 113 Third piece, 114 Winding collapse prevention wall, 120 Second insulating cap, 120a Protrusion, 120b Recess, 121 First piece, 122 Second piece, 122c Space, 123 Third piece, 124 Winding collapse prevention wall, 130 Winding path.

Claims

1. A stator insulating structure in which the surface of a protruding magnetic pole (12) with a square cross-section in the stator core (10) is insulated by a first insulating cap (110) and a second insulating cap (120), The first insulating cap (110) is It is formed in a U-shape from insulating material by a first piece (111) provided on one side in the longitudinal direction, a second piece (112) provided on the other side in the longitudinal direction, and a third piece (113) sandwiched between the first piece (111) and the second piece (112). The first piece (111) is provided with either a convex portion (110a) or a concave portion (110b) on the side opposite to the surface facing the protruding magnetic pole (12). The second piece (112) is provided with either a convex portion (110a) or a concave portion (110b) on the surface facing the protruding magnetic pole (12), The second insulating cap (120) is It is formed in a U-shape from insulating material by a first piece (121) provided on one side in the longitudinal direction, a second piece (122) provided on the other side in the longitudinal direction, and a third piece (123) sandwiched between the first piece (121) and the second piece (122). The first piece (121) is provided with either a convex portion (120a) or a concave portion (120b) on the side opposite to the surface facing the protruding magnetic pole (12). The second piece (122) is provided with either a convex portion (120a) or a concave portion (120b) on the surface facing the protruding magnetic pole (12), The protrusion (110a) of the first insulating cap (110) and the recess (120b) of the second insulating cap (120) overlap, and the protrusion (120a) of the second insulating cap (120) and the recess (110b) of the first insulating cap (110) overlap, and the first insulating cap (110) and the second insulating cap (120) overlap to form a rectangular insulating cap body, thereby insulating the area around the protruding magnetic pole (12). Stator isolation structure.

2. The area occupied by the protrusion (110a) of the first insulating cap (110) is formed to be smaller than the opening area of ​​the recess (120b) of the second insulating cap (120). The area occupied by the protrusion (120a) of the second insulating cap (120) is formed to be smaller than the opening area of ​​the recess (110b) of the first insulating cap (110). The stator insulation structure according to claim 1.

3. The second piece (112) of the first insulating cap (110) is provided with a space (112c) between it and the protruding magnetic pole (12) for accommodating the first piece (121) of the second insulating cap (120). The second piece (122) of the second insulating cap (120) is provided with a space (122c) between it and the protruding magnetic pole (12) for accommodating the first piece (111) of the first insulating cap (110). The stator insulation structure according to claim 1.

4. The volume of the first piece (111) of the first insulating cap (110) is formed to be smaller than the volume of the second piece (122) of the second insulating cap (120). The volume of the first piece (121) of the second insulating cap (120) is formed to be smaller than the volume of the second piece (112) of the first insulating cap (110). The stator insulation structure according to claim 3.

5. The first insulating cap (110) is further provided with a winding collapse prevention wall (114), The second insulating cap (120) is further provided with a winding collapse prevention wall (124), At least one gap is provided in at least one of the winding collapse prevention wall (114) and the winding collapse prevention wall (124) as a winding path (130). The stator insulation structure according to claim 1.

6. The first insulating cap (110) and the second insulating cap (120) are configured to have the same shape. The stator insulation structure according to any one of claims 1 to 5.

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