Stator, electric motor and refrigerant compressor equipped therewith, and air conditioner and refrigerator.

Abstract

The present invention provides a motor stator that has a simple structure, ensures a good insulation distance between the iron core and the coil, and suppresses or avoids the complexity of the manufacturing process. [Solution] The stator comprises a core in which a plurality of segmented cores are arranged in a ring, a pair of insulators that cover and insulate both end faces of the segmented cores, a coil 13 in which a wire 13a is wound around the tooth portion 22 via the insulators, and an insulating sheet 40 that insulates the space between the segmented core and the coil 13. The tooth portion 22 has a pair of umbrella portions 22b that extend outward from both circumferential edges of the protruding end portion 22a from the yoke portion. The insulator has an extended structure portion 36 having a side covering surface 36b that covers a part of the side surface of the umbrella portion 22b. The extended structure portion 36 has a groove portion 36a adjacent to the side covering surface 36b that opens toward the slot 27. The side edge portion 40a of the insulating sheet 40 is inserted into the groove portion 36a.

Description

Technical Field

[0001] The present invention relates to a stator provided in a motor, a motor or a refrigerant compressor provided with this stator, and further an air conditioner and a refrigerator provided with the refrigerant compressor.

Background Art

[0002] Conventionally, as a stator, for example, a stator provided with magnetic poles disclosed in Patent Document 1 is known. The magnetic poles disclosed in Patent Document 1 are formed by a winding frame attached to an iron core, a sheet-like insulator, and a coil. The winding frame has functions of electrical insulation between the iron core and the coil, winding the coil at a predetermined position, supporting the terminal portion of the coil, and holding the sheet-like insulator at a predetermined position. Further, the iron core includes a yoke portion, a tooth portion, and a tip portion extending in an arc shape from the tooth portion.

[0003] The sheet-like insulator is composed of a first surface, a second surface and a third surface connected to this first surface, and a fourth surface connected to this third surface. The axial end portion of the second surface extends axially so as to straddle the tip portion of the tooth portion, and this axial end portion is inserted into a slit regulated by a second flange of the winding frame. Further, Patent Document 1 also discloses a configuration in which a bent portion is provided on the second surface. This bent portion avoids interference between the second surfaces of adjacent magnetic poles and ensures a long insulation distance between the iron core (the tip portion of the tooth portion) and the coil.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the sheet-like insulator disclosed in Patent Document 1, as described above, a bent portion is provided on the second surface in order to properly insulate the tip of the teeth portion of the iron core. If this bent portion is made long, the insulator may protrude in the inner diameter direction of the stator and come into contact with the rotor. Therefore, the bent portion needs to be bent to a short width, for example, about 1 mm, but since bending to such a short width is difficult, the structure of the sheet-like insulator becomes complicated.

[0006] Furthermore, in the sheet-like insulator disclosed in Patent Document 1, a slit is provided in the winding frame, and the position of the insulator is regulated by inserting the end of the second surface of the insulator into this slit. However, the process of inserting the sheet-like insulator into the slit requires fine positional adjustment, which may lead to increased complexity in the manufacturing process.

[0007] This disclosure was made to solve these problems, and aims to provide a stator for an electric motor that can ensure a good insulation distance between the iron core and the coil with a simple configuration, while also suppressing or avoiding the complexity of the manufacturing process. [Means for solving the problem]

[0008] To solve the aforementioned problems, the stator according to the present disclosure comprises a core configured in which a plurality of segmented cores are arranged in a ring, each segmented core having a toothed portion that protrudes inward in the circumferential direction, with a slot formed between adjacent toothed portions; a pair of insulators that cover and insulate both axial end faces of the segmented cores; a coil formed by winding a wire around the toothed portion via the insulators; and an insulating sheet that insulates the space between the segmented core and the coil. The segmented core has a yoke portion that extends in the circumferential direction of the core; the toothed portion has a pair of umbrella portions that protrude from the inner surface of the yoke portion and extend outward from both circumferential edges at the protruding end; the pair of insulators has an extended structure portion that covers part of the sides of the pair of umbrella portions in addition to both end faces of the segmented core; the extended structure portion has a groove portion adjacent to the side covering surface that opens toward the slot, and the side edge portion of the insulating sheet is inserted into the groove portion.

[0009] According to the above configuration, when attaching the insulating sheet to the divided core, both ends of the axial side edges (tip portions) of the insulating sheet are inserted into the grooves of the stretched structure portion of the insulator. At this time, since the grooves are adjacent to the side covering surface and face the slots, the insulating sheet can be easily positioned simply by inserting the side edges of the insulating sheet into the grooves and bringing them into contact with the bottom surface of the grooves.

[0010] This allows for the mitigation or avoidance of complex manufacturing processes without requiring a complex structure for the insulating sheet. Therefore, the stator manufacturing process can be made more efficient. Furthermore, because the process of attaching the insulating sheet to the segmented core is efficient, it becomes possible to automate the insulating sheet attachment process.

[0011] Furthermore, with the above configuration, the creepage distance between the inner surface of the groove and the inner surface of the extension structure adjacent to the groove is maintained, thus ensuring a good insulation distance between the yoke (iron core) and the coil inside the slot. This makes it possible to shorten the distance from the inner surface of the divided core to the coil. As a result, the cross-sectional area of ​​the slot in the left-right direction (direction perpendicular to the axial direction) can be increased, making it possible to increase the number of wire turns. Consequently, the efficiency of an electric motor equipped with the stator according to this disclosure can be further improved.

[0012] The disclosure also includes an electric motor having a stator having the above configuration, a refrigerant compressor having an electric motor having the above configuration as an electric unit, and an air conditioner or refrigerator having a refrigerant compressor having the above configuration. [Effects of the Invention]

[0013] This disclosure provides a stator for an electric motor that, with the above configuration, can ensure a good insulation distance between the iron core and the coil with a simple structure, while also suppressing or avoiding increased complexity in manufacturing. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing an example of the stator configuration according to Embodiment 1 of this disclosure. [Figure 2] Figure 1 is a top view of the stator, schematically showing the rotor together with the stator. [Figure 3] Figure 1 is a side view of the stator. [Figure 4] Figure 1 is an exploded perspective view showing a typical example of the configuration of the segmented cores of the stator shown. [Figure 5] (A) to (C) are perspective views showing the step-by-step assembly process of the segmented core shown in Figure 4. [Figure 6] Figure 5(C) shows a front view of the segmented core as seen from the inside, and a comparison diagram with the cross-sectional view taken along line II in the front view. [Figure 7]It is a top view, an inward side view, a bottom view, and a comparative view of a cross-sectional view taken along the arrow II-II of the bottom view, showing an example of a typical configuration of an insulator included in the split core shown in FIGS. 4 to 6. [Figure 8] (A) is an upward perspective view of the insulator shown in FIG. 7, (B) is a downward perspective view of the insulator shown in FIG. 7, and (C) is an enlarged perspective view showing a typical configuration example of an extended structure portion included in the insulator of FIGS. 7 and 8(A), (B) and its vicinity. [Figure 9] (A) is a partial cross-sectional view schematically showing a typical configuration example near the umbrella portion in the cross-sectional view of the split core shown in FIG. 6, and (B) is a partial cross-sectional view schematically showing a configuration example near the umbrella portion in the split core included in the conventional stator. [Figure 10] It is a comparative view between a side view of the split core shown in FIGS. 所4 to 6 seen from the right direction and a partial enlarged view within the frame of the side view. [Figure 11] It is a cross-sectional view schematically showing a typical configuration example of an electric motor according to Embodiment 2 of the present disclosure, which includes the stator shown in FIG. 1. [Figure 12] (A) is a schematic block showing a typical configuration example of an air conditioner according to Embodiment 3 of the present disclosure, which uses a refrigerant compressor including the stator shown in FIG. 1, and (B) is a schematic block diagram showing a typical configuration example of a refrigerator according to Embodiment 3 of the present disclosure, which uses a refrigerant compressor including the stator shown in FIG. 1. [Embodiments for Carrying Out the Invention]

[0015] Hereinafter, typical embodiments of the present disclosure will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and the overlapping descriptions thereof are omitted.

[0016] (Embodiment 1) [Example of Stator Configuration] First, a typical configuration example of the stator according to the present disclosure will be described with reference to FIGS. 1 to 6. Note that FIG. 6 is a comparison diagram of the front view (upper figure) of the split core shown in FIG. 5(C) and the cross-sectional view taken along the line I-I of this front view (lower figure), and the positional relationship between these figures is compared with dotted lines.

[0017] As shown in FIGS. 1, 2, and 3, the stator 10 according to Embodiment 1 includes a core 18, a coil 13, and an insulator 30. The core 18 has a cylindrical yoke 11. In FIGS. 1 and 3, the axis 11a of the yoke 11 is shown by a thick dashed line. This axis 11a is also the central axis of the core 18, the central axis of the stator 10, and the rotation axis of the rotor 15 schematically shown by a dashed line in FIG. 2.

[0018] As also indicated by arrows in FIGS. 1 and 3 and other drawings, the axial direction parallel to the axis 11a of the yoke 11 is referred to as the vertical direction. In the radial direction centered on the axis 11a of the yoke 11, the direction toward the axis 11a is referred to as the inward direction, and the opposite direction is referred to as the outward direction. The intersecting direction intersecting the axial direction and the radial direction is referred to as the left-right direction. However, the arrangement of the stator 10 is not limited to this.

[0019] The stator 10 is formed by a plurality (12 in the examples of FIGS. 1 and 2) of segments 12. As shown in FIGS. 1 to 3, each segment 12 includes a split core 20, a coil 13, and an insulator 30, and further includes an insulating sheet 40 as shown in FIG. 4. As shown in FIGS. 4 and 5(A), the split core 20 includes a yoke portion 21 and a tooth portion 22, and as shown in FIGS. 4 and 5(A), the upper surface and the lower surface, which are both end faces of the split core 20 in the vertical direction, are each covered with an insulator 30. Also, as shown in FIG. 5(B), the wire 13a is wound around the tooth portion 22 via the insulator 30 to form the coil 13.

[0020] The yoke portion 21 has a substantially arc-shaped cross-section perpendicular to the axial direction. In other words, the yoke portion 21 is a part of the divided core 20 that extends in the circumferential direction of the core 18. The sides of the yoke portion 21 are provided with a fitting structure for positioning and arranging adjacent yoke portions 21 (i.e., adjacent divided cores 20) side by side. In this embodiment 1, as a fitting structure, for example, one side of the yoke portion 21 in the left-right direction is provided with a projection extending vertically from the upper end to the other end of that side, and the other side is provided with a recess extending vertically from the upper end to the other end of that side. By fitting the projection of one yoke portion 21 into the recess of the other adjacent yoke portion 21, 12 yoke portions 21 are arranged adjacently to form a cylindrical yoke 11.

[0021] Then, the stator 10 is formed by fixing the yoke portions 21 adjacent to each other in the circumferential direction by welding or the like. In this stator 10, twelve segmented cores 20 are connected to form an annular core 18, and the yoke portions 21 of these segmented cores 20 constitute the yoke 11. Therefore, in this disclosure, the core 18 is formed by arranging a plurality of segmented cores 20 in an annular shape. Furthermore, because the segmented cores 20 constitute the annular core 18, the plurality of insulators 30 covering the upper and lower surfaces of the plurality of segmented cores 20 are also substantially annular in shape.

[0022] The segmented core 20 of segment 12 is, for example, formed by fixing multiple steel plates stacked vertically by riveting. As shown in Figures 4 and 6 (bottom), the segmented core 20 has a yoke portion 21 and a teeth portion 22, as described above, and the teeth portion 22 has a pair of umbrella portions 22b. The segmented core 20 has an upper surface and a lower surface, which are end faces that intersect (for example, orthogonal) with respect to the vertical direction. Except for the fitting structure described above, the segmented core 20 has a shape that is symmetrical with respect to a radially extending centerline.

[0023] The yoke portion 21 has an outer surface and an inner surface that intersect (for example, perpendicular to) the radial direction. For example, the outer surface is a curved surface that is curved in a substantially arc shape in the left-right direction and extends linearly in the up-down direction, while the inner surface is a planar surface parallel to the up-down and left-right directions. Furthermore, the yoke portion 21 has a right side surface and a left side surface as sides that intersect with the left-right direction.

[0024] The teeth portion 22 is positioned in the center of the yoke portion 21 in the left-right direction and protrudes radially inward from the inner surface of the yoke portion 21. Therefore, the inner surface of the yoke portion 21 has a right inner surface positioned to the right of the teeth portion 22 and a left inner surface positioned to the left of the teeth portion 22. The teeth portion 22 is, for example, rectangular parallelepiped and has a right side surface and a left side surface as sides that intersect (for example, orthogonal) with respect to the left-right direction. The right side surface and the left side surface are, for example, planar. Therefore, in this disclosure, each of the plurality of segmented cores 20 constituting the core 18 has a teeth portion 22 that protrudes circumferentially inward, or in other words, the teeth portion 22 can be said to be a part of the segmented core 20 that is erected inward when viewed from the circumferential direction of the core 18.

[0025] An umbrella portion 22b is provided at the protruding end 22a of the teeth portion 22. The protruding end 22a is the inward-facing end of the teeth portion 22, and the umbrella portion 22b extends outward from both side edges in the circumferential direction of this protruding end 22a, in the left-right direction in the example shown in Figure 4. Therefore, if the umbrella portion 22b is considered a part of the protruding end 22a, then the protruding end 22a is a "wide portion" that is wider in the left-right direction than the teeth portion 22. However, the width of the protruding end 22a as a "wide portion" is narrower than the width of the yoke portion 21.

[0026] The protruding end portion 22a, which is the "wide portion," has an inner and outer surface that intersects (for example, perpendicular to) the radial direction, and a side surface that intersects in the left-right direction and connects the inner and outer surfaces. The inner surface is curved in a substantially arc shape in the left-right direction and extends linearly in the up-down direction. The outer surface is planar and inclined radially inward with respect to the direction away from the teeth portion 22 in the left-right direction. This outer surface has a right outer surface located to the right of the teeth portion 22 and a left outer surface located to the left of the teeth portion 22, and faces the inner surface of the yoke portion 21 in the radial direction.

[0027] As shown in Figures 5(A) and 6 (below), the space enclosed by the right outer surface of the protruding end 22a, the right outer surface of the right umbrella portion 22b, the right side of the teeth portion 22, and the right inner surface of the yoke portion 21 is used as the right slot 27. The space enclosed by the left outer surface of the protruding end 22a, the left outer surface of the left umbrella portion 22b, the left side of the teeth portion 22, and the left inner surface of the yoke portion 21 is used as the left slot 27. Therefore, in this disclosure, each of the multiple divided cores 20 constituting the core 18 has a teeth portion 22, and slots 27 are formed between adjacent teeth portions 22. Furthermore, as shown in Figure 5(B), a coil 13 is formed by winding a wire 13a around the teeth portion 22 via an insulator 30. This coil 13 is housed in the right slot 27 and the left slot 27.

[0028] The insulating sheet 40 is made of an electrically insulating resin or the like, is a thin sheet, and is elastic and flexible. The insulating sheet 40 electrically insulates between the divided core 20 and the coil 13, and between the coils 13 of two adjacent divided cores 20. As shown in Figure 4, two insulating sheets 40 are attached to one divided core 20. Specifically, as shown in Figures 5(A) and 6 (below), the right insulating sheet 40 is attached to the right slot 27 of one divided core 20, and the left insulating sheet 40 is attached to the left slot 27. The right insulating sheet 40 and the left insulating sheet 40 have a symmetrical shape with respect to a plane perpendicular to the left-right direction, including the center line of the radially extending teeth portion 22. Therefore, when viewed individually, the right insulating sheet 40 and the left insulating sheet 40 have the same shape. The right insulating sheet 40 will be described as representative below.

[0029] As shown in Figure 4, the insulating sheet 40 has a symmetrical shape with respect to a plane perpendicular to the vertical direction. The insulating sheet 40 has a first insulating section 41, a second insulating section 42, a third insulating section 43, an end extension section 44, and a bent section 45. The first insulating section 41, the second insulating section 42, and the third insulating section 43 are arranged in this order and are integrally formed. In addition, the vertical ends (upper and lower ends) of the portion of the first insulating section 41 adjacent to the second insulating section 42 are end extension sections 44 that extend upward or downward, respectively. The bent section 45 is connected from these end extension sections 44 toward the first insulating section 41.

[0030] The insulating sheet 40 is formed, for example, by cutting and folding a single sheet. Folds extending in the vertical direction are provided between each of the first insulating portion 41, the second insulating portion 42, and the third insulating portion 43. The first insulating portion 41, the second insulating portion 42, and the third insulating portion 43 are all rectangular in shape and are formed to dimensions that fit the shape of the slot 27. However, the vertical length (axial dimension) of the insulating sheet 40 is longer than the vertical length (axial dimension) of the divided core 20.

[0031] As described above, the upper bent portion 45 is connected to the upper end extension 44, and the lower bent portion 45 is connected to the lower end extension 44. A space is formed in the vertical direction between the lower end of the upper bent portion 45 and the upper end of the first insulating portion 41, and a space is also formed in the vertical direction between the upper end of the lower bent portion 45 and the lower end of the first insulating portion 41.

[0032] The bent portion 45 is rectangular in shape, with its left end connected to the right end of the end extension portion 44, and extends from the end extension portion 44, bending radially outward. The bent portion 45 extends from the end extension portion 44 in a direction away from the second insulating portion 42 in the left-right direction, and is bent from the end extension portion 44 such that the right end, which is the tip, is located radially outward from the left end, which is the base end in the left-right direction. As a result, a fold extending in the vertical direction is created between the end extension portion 44 and the bent portion 45.

[0033] The first insulating portion 41 insulates the coil 13 and the yoke portion 21. The second insulating portion 42 insulates the left and right sides of the teeth portion 22. The third insulating portion 43 insulates the outer surface of the umbrella portion 22b of the teeth portion 22. As shown in Figure 5(A), the bent portion 45 is fitted into a locking recess 35 provided in the insulator 30, and the right end of the bent portion 45 is locked to the locking surface of the locking recess 35. In this way, the insulating sheet 40 is positioned and attached to the divided core 20.

[0034] When the insulating sheet 40 is attached to the divided core 20, as shown in Figure 5(A), the second insulating portion 42 of the insulating sheet 40 abuts against the side surface of the tooth portion 22, and the third insulating portion 43 abuts against the outer surface of the umbrella portion 22b, but the first insulating portion 41 is open outwards. Subsequently, as shown in Figure 5(B), once the wire 13a is wound around the tooth portion 22 via the insulator 30 and the second insulating portion 42 of the insulating sheet 40 to form the coil 13, the first insulating portion 41 of the insulating sheet 40 is bent toward the coil 13 side (the side surface of the tooth portion 22) to cover the entire side surface of the coil 13, as shown in Figures 5(C) and 6 (upper figure). This insulates adjacent coils 13 from each other in the core 18. Furthermore, as shown in Figures 5(B), 5(C), and 6 (top), the umbrella portion 22b of the teeth portion 22 and the upper and lower side edges of the third insulating portion 43 of the insulating sheet 40 are both supported by the stretched structural portion 36 provided by the pair of insulators 30. [Example of an insulator configuration]

[0035] Next, a more specific configuration example of the insulator 30 provided in the stator 10 according to this disclosure will be described with reference to Figures 1 to 6, as well as Figures 7 to 10. Figure 7 shows, from top to bottom, a top view (top), an inward side view (middle), and a bottom view and a cross-sectional view taken along line II-II of the bottom view (bottom), with the positional relationship of these figures being compared by a dotted line. Figure 10 shows, on the right, a right side view of the segment 12 without the coil 13 shown in Figure 5(A), and on the left, an enlarged view of the area within the thick frame in the right figure.

[0036] As described above, the pair of insulators 30 cover and insulate both axial end faces of the divided core 20. The insulators 30 are made of, for example, an electrically insulating resin, and consist of an upper insulator 30 attached to the upper surface of the divided core 20 and a lower insulator 30 attached to the lower surface of the divided core 20.

[0037] Mounting protrusions are formed on the lower surface of the upper insulator 30 and the upper surface of the lower insulator 30, and mounting holes are formed on the upper and lower surfaces of the divided core 20. The insulators 30 are attached to the divided core 20 by inserting the protrusions into the mounting holes. However, the mounting configuration of the insulators 30 to the divided core 20 is not limited to protrusions and mounting holes.

[0038] In this embodiment 1, the insulator 30 has an outer flange portion 31, a body portion 32, and an inner flange portion 33, as shown in Figures 7 and 8(A) and (B). The outer flange portion 31 of the upper insulator 30 covers the upper surface of the yoke portion 21, and the outer flange portion 31 of the lower insulator 30 covers the lower surface of the yoke portion 21. The body portion 32 of the upper insulator 30 covers the upper surface of the teeth portion 22, and the body portion 32 of the lower insulator 30 covers the lower surface of the teeth portion 22. The inner flange portion 33 of the upper insulator 30 covers the upper surfaces of the protruding end portion 22a and the umbrella portion 22b of the teeth portion 22, and the inner flange portion 33 of the lower insulator 30 covers the lower surfaces of the protruding end portion 22a and the umbrella portion 22b of the teeth portion 22.

[0039] Therefore, the lower surface of the upper insulator 30 is an end-face covering surface 34 that covers the upper surface of the divided core 20, and the upper surface of the lower insulator 30 is an end-face covering surface 34 that covers the lower surface of the divided core 20. These end-face covering surfaces 34 are basically planar, but may have one or more recesses that are recessed upward or downward from the end-face covering surface 34 as needed.

[0040] As shown in Figures 4, 7, and 8(A), the outer flange portion 31 of the upper insulator 30 has a pair of locking recesses 35 on the left and right sides of the lower inner surface (closer to the end face covering surface 34). Similarly, the lower insulator 30 also has a pair of locking recesses 35. As mentioned above, these locking recesses 35 are the parts into which the bent portion 45 of the insulating sheet 40 is fitted, thereby positioning and attaching the insulating sheet 40.

[0041] As shown in Figures 4, 5(A)-(C), 7(upper figure), and 8(A)-(C), the pair of insulators 30 have an extension structure 36 that is erected to extend toward the end face covering surface 34 of the inner flange portion 33. For the upper insulator 30, the extension structure 36 extends downward from the lower corners of the left and right side edges of the inner flange portion 33. For the lower insulator 30, the extension structure 36 extends upward from the upper corners of the left and right side edges of the inner flange portion 33.

[0042] As shown in Figure 7 (lower figure) and Figures 8(A) to (C), grooves 36a are provided on the opposing surfaces (inner surfaces) of a pair of stretched structural parts 36, along the stretching direction of the stretched structural part 36. In the case of the upper insulator 30 shown in Figure 4 or Figures 5(A) to (C) and Figure 6, the left surface of the right stretched structural part 36 and the right surface of the left stretched structural part 36 are opposing inner surfaces (opposing surfaces), and grooves 36a are formed on these inner surfaces, each along the vertical direction. As shown in the partially enlarged view of Figure 8(C), a side covering surface 36b is provided on the inner surface of the stretched structural part 36 along with the grooves 36a. The side covering surface 36b is an inward region of the inner surface of the stretched structural part 36, and is a radially extending surface that covers a part of the side surface of the umbrella portion 22b of the teeth portion 22.

[0043] As shown in Figures 5(A) and 6 (below), when the insulator 30 is attached to the split core 20, the inner surface of the outer flange portion 31 (the inward surface of the tooth portion 22 toward the umbrella portion 22b) is positioned to extend the inner surface of the yoke portion 21, and together with the inner surface of the yoke portion 21, forms the outer surface for the slot 27. Both sides (left and right surfaces) of the body portion 32 are positioned to extend the sides of the tooth portion 22, and together with the sides of the tooth portion 22, form the inner side of the slot 27 (the right side of the tooth portion 22 in the right slot 27 shown in Figure 5(A)). The outer surface of the inner flange portion 33 (the outward surface toward the yoke portion 21) is positioned to extend the inner surface of the protruding end portion 22a, and together with the inner surface of the protruding end portion 22a, forms the inner surface for the slot 27.

[0044] The outer side for slot 27 (the side facing the right side of slot 27, the right side in the circumferential direction in the right slot 27 shown in Figure 5(A)) is open when the wire 13a is not wound around the teeth portion 22 via the second insulating portion 42 of the insulating sheet 40, as shown in Figure 5(A). When the wire 13a is wound to form the coil 13, as shown in Figure 5(B), and the first insulating portion 41 of the insulating sheet 40 is bent, as shown in Figure 5(C), the inner surface of the first insulating portion 41 (the surface adjacent to the coil 13) forms the outer side of slot 27.

[0045] The sides (left and right surfaces) of the inner flange portion 33 and the outer surface (opposing surface or surface opposite the inner surface) of the extension structure portion 36 have a step that protrudes outward (left and right direction) than the umbrella portion 22b that constitutes the side of the protruding end portion 22a. This is because the side covering surface 36b provided on the inner surface of the extension structure portion 36 covers the sides (left and right surfaces) of the umbrella portion 22b. As shown in Figure 9(A), the groove portion 36a provided on the inner surface of the extension structure portion 36 faces the slot 27 adjacent to the side covering surface 36b, with the side covering surface 36b as the reference.

[0046] Therefore, the pair of insulators 30 have, as covering surfaces, end covering surfaces 34 that cover both end faces of the divided core 20, as well as side covering surfaces 36b that cover parts of both sides of the pair of umbrella portions 22b (the upper and lower ends of the sides of the umbrella portions 22b). Furthermore, the end covering surfaces 34 are provided on the "body" of the insulator 30, while the side covering surfaces 36b are provided on the stretched structure portion 36. In addition, the groove portion 36a is provided on the stretched structure portion 36 so as to open toward the slot 27, and as shown in Figures 9(A) and 10, the side edges of the insulating sheet 40 are inserted into the groove portion 36a.

[0047] [Method for manufacturing stators] Next, a typical example of a method for manufacturing the stator 10 with the above configuration will be described. As shown in Figures 4 and 5(A), the upper insulator 30 is attached to the upper surface of the divided core 20, and the lower insulator 30 is attached to the lower surface of the divided core 20. At this time, the end face covering surface 34 of the upper insulator 30 covers the upper surface of the divided core 20 (the yoke portion 21, the tooth portion 22, and the upper surface of the protruding end 22a and umbrella portion 22b of the tooth portion 22), and similarly, the end face covering surface 34 of the lower insulator 30 covers the lower surface of the divided core 20. In addition, in the pair of extended structural portions 36 of the upper insulator 30, the upper ends of both sides above the umbrella portion 22b are covered by the side covering surface 36b, and in the pair of extended structural portions 36 of the lower insulator 30, the lower ends of both sides below the umbrella portion 22b are covered by the side covering surface 36b.

[0048] Next, the insulating sheet 40 is attached to the left and right slots 27. Both ends of the third insulating portion 43 of the insulating sheet 40 (side edges 40a, described later) are inserted into the grooves 36a of the pair of extension structures 36 and pressed toward the teeth portion 22. As a result, the second insulating portion 42 comes into contact with the side surface of the teeth portion 22, the portion of the first insulating portion 41 closer to the second insulating portion 42 comes into contact with the inner surface of the yoke portion 21, and the bent portion 45 provided on the end extension portion 44 of the first insulating portion 41 is fitted into the locking recess 35 of the insulator 30 and locked in place. Thus, the insulating sheet 40 is attached to the divided core 20 in substantially one step. Furthermore, the extension structures 36 and the locking recess 35 restrict the movement of the insulating sheet 40 in both the axial and radial directions, so that it is well positioned and held toward the divided core 20.

[0049] Next, as shown in Figure 5(B), the wire 13a is wrapped around the teeth portion 22 over the second insulating portion 42 of the insulating sheet 40 and the body portion 32 of the pair of insulators 30 to form the coil 13. Then, as shown in Figure 5(C), the first insulating portion 41 of the insulating sheet 40, which extends radially outward (left and right direction) of the divided core 20, is bent to cover both sides of the coil 13. As a result, the insulating sheet 40 is interposed between the coil 13 in the slot 27 and the divided core 20 around the slot 27, and the divided core 20 and the coil 13 are electrically insulated by the insulating sheet 40.

[0050] In this way, the segments 12 are formed as shown in Figures 5(C) and 6 (upper figure). Then, for example, the 12 segments 12 are arranged in a ring in the circumferential direction and the yoke portion 21 is fixed by a known method such as welding, thereby manufacturing the stator 10 as shown in Figures 1 to 3. In this stator 10, the first insulating portion 41 of the insulating sheet 40 is interposed between the coils 13 in adjacent segments 12, so that the coils 13 can be electrically insulated from each other.

[0051] In conventional stators, for example, as shown in Figure 9(B), a slit is formed between the umbrella portion 22b and the conventional insulator 130, and the side edge of the conventional insulating sheet 140 is sandwiched within this slit. Inserting the insulating sheet 140 into such a narrow slit complicates the manufacturing process.

[0052] Furthermore, the sides of the umbrella portion 22b are not insulated by the conventional insulator 130. Therefore, with the conventional insulating sheet 140, it is necessary to bend the side edges (tip portions) to form a bent portion 140a. Such bending of the insulating sheet 140 also complicates the manufacturing process.

[0053] In contrast, in this embodiment 1, as described above, when attaching the insulating sheet 40 to the divided core 20, both ends of the vertical (axial) side edges (tip portions) of the third insulating portion 43 are inserted into the grooves 36a of the stretched structure portion 36. As shown in Figure 9(A), the grooves 36a of the stretched structure portion 36 face the slot 27 adjacent to the side covering surface 36b that covers the side surface of the umbrella portion 22b. Therefore, the third insulating portion 43 can be easily positioned simply by inserting the side edges 40a of the insulating sheet 40 into the grooves 36a and bringing the side edges 40a into contact with the bottom surface of the grooves 36a.

[0054] Furthermore, the insulating sheet 40 is provided with a bent portion 45, and the insulator 30 is provided with a locking recess 35. Therefore, by simply inserting the side edge 40a of the insulating sheet 40 into the groove 36a and making contact, and then pushing the insulating sheet 40 into the slot 27, the insulating sheet 40 can be attached to the divided core 20 in essentially one step. Therefore, the manufacturing process of the stator 10 can be made even more efficient. In addition, because the work of attaching the insulating sheet 40 to the divided core 20 is efficient, it is possible to automate the work of attaching the insulating sheet 40.

[0055] Furthermore, as shown by the dotted line distance Di in Figure 9(A), the creepage distance is the distance between both sides and the bottom surface inside the groove 36a, as well as the inner surface of the extension structure 36 adjacent to the groove 36a. Therefore, compared to the conventional configuration shown in Figure 9(B), a longer insulation distance can be secured inside the slot 27. This makes it possible to shorten the distance from the inner surface of the divided core 20 to the coil 13, as shown by Dii in the figure. This makes it possible to increase the cross-sectional area of ​​the slot 27 in the left-right direction (direction perpendicular to the axial direction), and thus increase the number of turns of the wire 13a. As a result, the efficiency of the electric motor equipped with the stator 10 according to this disclosure can be made even better.

[0056] In the stator 10 according to this disclosure, as described above, the extension structure 36 only needs to have a groove 36a adjacent to the side covering surface 36b that opens toward the slot 27, and the specific configuration of the groove 36a is not particularly limited. The groove 36a basically only needs to have a bottom surface and a pair of opposing surfaces (groove sides) extending from the bottom surface toward the opening. In the examples shown in Figures 8(C) and 9(A), the shape of the cross section (cross section in a direction perpendicular to the longitudinal direction or the extension direction) is rectangular, but the cross section may be U-shaped, that is, the bottom surface may be curved rather than flat.

[0057] Furthermore, while the opening of the groove 36a only needs to face the slot 27, as shown in Figure 9(A), the groove side (inner groove side) of the pair of opposing surfaces (groove sides) in the groove 36a that is located inward (close to or adjacent to the umbrella portion 22b) may form a substantially continuous surface with the outer surface of the umbrella portion 22b. Alternatively, the inner groove side of the groove 36a may not protrude outward from the outer surface of the umbrella portion 22b, but rather be configured to be recessed inward from that outer surface. By configuring the inner groove side in this way, the insulating sheet 40 can be inserted into the groove 36a more easily.

[0058] Furthermore, the configuration example shown in Figure 9(A) illustrates a configuration in which a tapered portion 36e is provided at the opening of the groove portion 36a (the gap at the front opposite the bottom surface). Specifically, on the groove side surface (outer groove side surface) of the pair of groove sides in the groove portion 36a that is located outward (away from the umbrella portion 22b), a tapered portion 36e may be provided as a slope such that the distance between the openings (the distance or width of the groove portion 36a) widens from the bottom surface toward the opening. This makes it easier to insert the side edge portion 40a (tip portion) of the insulating sheet 40 into the groove portion 36a, thereby further improving the efficiency of the installation work of the insulating sheet 40.

[0059] The spacing (width) of the grooves 36a is not particularly limited, and it is sufficient that it is at least greater than the thickness of the insulating sheet 40. A typical spacing of grooves 36a is 1.2 times or more the thickness of the insulating sheet 40. Furthermore, the length of the grooves 36a and the length of the extended structure 36 are not particularly limited. Typically, a length equal to or greater than the insulation distance specified in laws or standards can be cited. A typical length of the extended structure 36 is 2 mm or more. In addition, even when a tapered portion 36e is provided in the grooves 36a, the spacing (width) of the opening edge of the grooves 36a due to the provision of the tapered portion 36e, or the degree of inclination of the tapered portion 36e, are not particularly limited.

[0060] Furthermore, the vertical length of the insulating sheet 40, that is, the axial dimension of the insulating sheet 40, is not particularly limited and can be matched to the axial dimension of the divided core 20. In this embodiment 1, from the viewpoint of achieving better insulation, it is made longer than the axial dimension of the divided core 20, for example, as shown in Figure 10. In Figure 10 (right figure), since the axial (vertical) length of the insulating sheet 40 is longer than the axial length of the divided core 20, the positions of the upper and lower ends of the teeth portion 22 are shown with dotted lines.

[0061] Furthermore, if the axial dimension of the insulating sheet 40 is made longer in this configuration, a recessed area 36c may be provided in the insulator 30 near the base of the stretched structure portion 36 (adjacent to the area where the stretched structure portion 36 is located on the end face covering surface 34 of the inner flange portion 33), as shown in Figure 8(C), to match the length of the insulating sheet 40. An extended groove portion 36d may be provided in this recessed area 36c, extending from the groove portion 36a of the stretched structure portion 36 to the recessed area 36c.

[0062] Using the end face covering surface 34 of the insulator 30 as a reference, the insulator 30 has a recessed portion 36c that is recessed in the axial direction (up and down direction) between the extended structure portion 36 and the end face covering surface 34. Furthermore, the recessed portion 36c has an extended groove portion 36d that extends integrally with the groove portion 36a that extends in the axial direction. The extended groove portion 36d can also be considered as the portion where the groove portion 36a extends to the recessed portion 36c when viewed from the end face covering surface 34, so if a recessed portion 36c is provided, it can also be considered that the extended groove portion 36d is included in the groove portion 36a that extends in the axial direction.

[0063] As described above, the side edge 40a of the insulating sheet 40 is inserted into the groove 36a. However, if the insulator 30 is provided with a recess 36c and an extended groove 36d is formed in the recess 36c, then the side edge 40a of the insulating sheet 40 can be inserted into the groove 36a and the extended groove 36d. For example, as shown in Figure 10 (enlarged view of the left figure), if the recess dimension of the recess 36c (length of the recess in the axial direction) is made longer than the axial dimension of the insulating sheet 40, then the distance between the pair of grooves 36a and extended grooves 36d located at both ends of the divided core 20 will be greater than the axial dimension of the insulating sheet 40. Therefore, the side edge 40a of the insulating sheet 40 can be easily inserted into the groove 36a (and the extended groove 36d).

[0064] Furthermore, the axial movement of the insulating sheet 40 can be restricted by fitting both axial ends of the insulating sheet 40 into a pair of recesses 36c. Therefore, the recesses 36c can function as positioning parts when the insulating sheet 40 is attached to the divided core 20. The depth of the recesses 36c is not particularly limited and should be equal to or greater than the insulation distance specified in laws or standards. A typical depth of the recesses 36c is 2 mm or more, similar to the length of the extended structure 36.

[0065] Thus, the stator 10 according to this disclosure comprises a core 18 configured with a plurality of segmented cores 20 arranged in a ring, each segmented core 20 having teeth 22 protruding inward in the circumferential direction, and slots 27 formed between adjacent teeth 22; a pair of insulators 30 that cover and insulate both axial end faces of the segmented cores 20; a coil 13 in which wire 13a is wound around the teeth 22 via the insulators 30; and an insulating sheet 40 that insulates the space between the segmented cores 20 and the coil 13, wherein the segmented cores 20 are The core 18 has a yoke portion 21 that extends in the circumferential direction, and the teeth portion 22 protrudes from the inner surface of the yoke portion 21 and has a pair of umbrella portions 22b that extend outward from both circumferential edges at the protruding end, and the pair of insulators 30 have an extended structure portion 36 that covers both end faces of the divided core 20 as well as a part of the sides of the pair of umbrella portions 22b, and the extended structure portion 36 has a groove portion 36a adjacent to the side covering surface 36b that opens toward the slot 27, and the side edge portion 40a of the insulating sheet 40 is inserted into the groove portion 36a.

[0066] According to the above configuration, when attaching the insulating sheet 40 to the divided core 20, both ends of the axial side edges (tip portions) of the insulating sheet 40 are inserted into the grooves 36a of the stretched structure portion 36 of the insulator 30. At this time, since the grooves 36a are adjacent to the side covering surface 36b and face the slot 27, the insulating sheet 40 can be easily positioned simply by inserting the side edges of the insulating sheet 40 into the grooves 36a and bringing them into contact with the bottom surface of the grooves 36a. This makes it possible to suppress or avoid the complexity of the manufacturing process without making the insulating sheet 40 a complex structure. Therefore, the manufacturing process of the stator 10 can be made even more efficient. In addition, since the efficiency of the work of attaching the insulating sheet 40 to the divided core 20 is good, it is also possible to automate the work of attaching the insulating sheet 40.

[0067] Furthermore, with the above configuration, the inner surface of the groove 36a and the inner surface of the extension structure 36 adjacent to the groove 36a are at creepage distance, so a good insulation distance can be secured between the yoke 11 and the coil 13 inside the slot 27. This makes it possible to shorten the distance from the inner surface of the divided core 20 to the coil 13. As a result, the cross-sectional area of ​​the slot 27 in the left-right direction (direction perpendicular to the axial direction) can be increased, making it possible to increase the number of turns of the wire 13a. As a result, the efficiency of the electric motor equipped with the stator 10 according to this disclosure can be made even better.

[0068] (Embodiment 2) In Embodiment 1, a typical configuration example of a stator according to the present disclosure was described. In Embodiment 2, a typical configuration example of an electric motor equipped with the stator according to Embodiment 1 will be specifically described with reference to Figure 11.

[0069] The electric motor 14 according to Embodiment 2 of this disclosure comprises a stator 10, a rotor 15, and a housing 16 according to Embodiment 1, as shown in the schematic cross-sectional view of Figure 11. In Figure 11, only the yoke 11, coil 13, and insulating sheet 40 of the stator 10 are schematically simplified and shown.

[0070] The housing 16 accommodates the stator 10 and the rotor 15 and is fixed to the stator 10. The rotor 15 has a cylindrical rotating core 15a and a cylindrical rotating shaft 15b. The rotating core 15a is made up of, for example, multiple steel plates stacked vertically and fixed together by rivets, with permanent magnets embedded inside. The rotating shaft 15b is inserted into the central hole of the rotating core 15a and fixed to the rotating core 15a.

[0071] As schematically shown in Figure 11, the rotor 15 is positioned inside the stator 10, coaxially with the axis 11a of the stator 10, and is rotatably supported by the housing 16 via bearings 17. The outer circumferential surface of the rotor 15 faces the inner circumferential surface of the stator 10 at a distance.

[0072] The electric motor 14 according to this second embodiment is equipped with a stator 10 according to the first embodiment, and as shown in Figure 1 or Figure 2, the stator 10 is composed of 12 segments 12, and each segment 12 is equipped with one coil 13, so the number of slots is 12, but the number of slots in the stator 10 is not particularly limited. In the stator 10 according to the first embodiment, the distance Dii from the inner surface of the core 18 to the coil 13 (see Figures 9(A), (B)) can be made shorter, so it is possible to increase the number of slots in the stator 10. Typically, the number of slots in the stator 10 according to this disclosure is 9 or more.

[0073] Furthermore, in the electric motor 14 according to this second embodiment, the number of poles of the rotor 15 is not particularly limited, but since the number of slots in the stator 10 can be increased, it is possible to increase the number of poles as well. Typically, the number of poles of the electric motor 14 according to this disclosure should be 8 or more.

[0074] Furthermore, as mentioned above, shortening the distance Dii makes it possible to relatively suppress the reduction in the winding area of ​​the coil 13 within the slot 27. Therefore, the configuration of the stator 10 according to this disclosure can be suitably applied when the inner diameter of the core 18 is small. In other words, the configuration of the electric motor 14 according to this disclosure can be applied to a stator 10 with a relatively small inner diameter.

[0075] (Embodiment 3) In Embodiment 2, a typical configuration example of an electric motor equipped with a stator according to Embodiment 1 was described. In Embodiment 3, a typical example of an applied device equipped with a stator according to Embodiment 1 as the motor unit, or an applied device equipped with an electric motor according to Embodiment 2 as the motor unit, will be described with reference to Figures 12(A) and (B).

[0076] As described above, the application equipment relating to this disclosure is not particularly limited as long as it includes a stator 10 according to Embodiment 1 or an electric motor 14 according to Embodiment 2, or in other words, an electric motor 14 equipped with a stator 10 according to Embodiment 1. A typical example is a refrigeration cycle system that includes a refrigerant compressor using the stator 10 according to Embodiment 1 as the electric motor. Specific refrigeration cycle systems are not particularly limited, but examples include air conditioners, refrigerators (household and commercial), dehumidifiers, display cases, ice makers, heat pump water heaters, heat pump washing and drying machines, vending machines, etc.

[0077] In this third embodiment, an air conditioner will be described as a typical example of a refrigeration cycle system as an applied device. Specifically, as schematically shown in the block diagram of Figure 12(A), the air conditioner 60 according to this third embodiment comprises an indoor unit 61 and an outdoor unit 62, and piping 63 connecting them. The indoor unit 61 is equipped with a heat exchanger 64, and the outdoor unit 62 is equipped with a refrigerant compressor 50A, a heat exchanger 65, and a pressure reducing device 66. The refrigerant compressor 50A, as schematically shown in Figure 12(A), comprises an electric unit 51 equipped with a stator 10 and rotor 15 according to the first embodiment, and a compression unit 52.

[0078] The heat exchanger 64 of the indoor unit 61 and the heat exchanger 65 of the outdoor unit 62 are connected in a ring by piping 63, thereby forming a refrigeration cycle. Specifically, the heat exchanger 64 of the indoor unit 61, the refrigerant compressor 50A, the heat exchanger 65 of the outdoor unit 62, and the pressure reducing device 66 are connected in a ring by piping 63 in that order. In addition, a four-way valve 67 for switching between heating and cooling is provided in the piping 63 connecting the heat exchanger 64, the refrigerant compressor 50A, and the heat exchanger 65. Although omitted in Figure 12(A), the indoor unit 61 is equipped with a blower fan, temperature sensor, control unit, etc., and the outdoor unit 62 is equipped with a blower, accumulator, etc. Furthermore, various valve devices (including the four-way valve 67), strainers, etc. are provided in the piping 63.

[0079] The heat exchanger 64 in the indoor unit 61 performs heat exchange between indoor air drawn into the indoor unit 61 by a blower fan and the refrigerant flowing inside the heat exchanger 64. When heating, the indoor unit 61 blows air heated by heat exchange into the room, and when cooling, it blows air cooled by heat exchange into the room. The heat exchanger 65 in the outdoor unit 62 performs heat exchange between outside air drawn into the outdoor unit 62 by a blower and the refrigerant flowing inside the heat exchanger 65.

[0080] The specific configurations of the indoor unit 61 and the outdoor unit 62, as well as the specific configurations of the heat exchanger 64 or heat exchanger 65, pressure reducing device 66, four-way valve 67, blower fan, temperature sensor, control unit, blower, accumulator, other valve devices, strainer, etc., are not particularly limited, and known configurations can be suitably used. Furthermore, the air conditioner 60 may also be equipped with other known configurations.

[0081] An example of the operation of the air conditioner 60 shown in Figure 12(A) will be explained in detail. First, in cooling or dehumidifying operation, the refrigerant compressor 50A of the outdoor unit 62 compresses and discharges the gaseous refrigerant, which is then sent to the heat exchanger 65 of the outdoor unit 62 via the four-way valve 67. The heat exchanger 65 exchanges heat with the outside air, so the gaseous refrigerant condenses and liquefies. The liquefied liquid refrigerant is depressurized by the depressurizing device 66 and sent to the heat exchanger 64 of the indoor unit 61. In the heat exchanger 64, the liquid refrigerant evaporates due to heat exchange with the indoor air and becomes gaseous refrigerant. This gaseous refrigerant returns to the refrigerant compressor 50A of the outdoor unit 62 via the four-way valve 67. The refrigerant compressor 50A compresses the gaseous refrigerant and discharges it again to the heat exchanger 65 via the four-way valve 67.

[0082] In addition, during heating operation, the refrigerant compressor 50A of the outdoor unit 62 compresses and discharges the gaseous refrigerant, which is then sent to the heat exchanger 64 of the indoor unit 61 via the four-way valve 67. In the heat exchanger 64, the gaseous refrigerant condenses and liquefies through heat exchange with the indoor air. The liquefied liquid refrigerant is then depressurized by the depressurizing device 66 to become a gaseous two-phase refrigerant, which is then sent to the heat exchanger 65 of the outdoor unit 62. The heat exchanger 65 exchanges heat between the outside air and the gaseous two-phase refrigerant, so the gaseous two-phase refrigerant evaporates and becomes a gaseous refrigerant, which returns to the refrigerant compressor 50A. The refrigerant compressor 50A compresses the gaseous refrigerant and discharges it again to the heat exchanger 64 of the indoor unit 61 via the four-way valve 67.

[0083] As described above, the refrigerant compressor 50A of the air conditioner 60 according to this third embodiment is not particularly limited in its specific configuration, as long as it is equipped with an electric unit 51 using the stator 10 according to the first embodiment (or an electric motor 14 according to the second embodiment is used as the electric unit 51). Typically, the refrigerant compressor 50A may have a scroll type or rotary type compression unit 52.

[0084] Alternatively, as another representative example of a refrigeration cycle system as an applied device, a refrigerator will be used as an example. Specifically, as schematically shown in the block diagram of Figure 12(B), the refrigerator 70 according to this third embodiment includes a refrigerant compressor 50B, a condenser 71, a pressure reducing device 72, an evaporator 73, and piping 74, as well as a storage chamber 75, etc. As shown in Figure 12(B), the refrigerant compressor 50B includes an electric unit 51 which has a stator 10 and a rotor 15 according to the first embodiment, and a compression unit 53. Although not shown in Figure 12(B), the refrigerator 70 also includes a main body housing, a blower, an operating unit, a control unit, etc.

[0085] The refrigerant compressor 50B compresses the refrigerant gas into a high-temperature, high-pressure gaseous refrigerant. The condenser 71 cools the refrigerant and liquefies it. The pressure reducing device 72, for example, is composed of a capillary tube and reduces the pressure of the liquefied refrigerant (liquid refrigerant). The evaporator 73 evaporates the refrigerant into a low-temperature, low-pressure gaseous refrigerant. The refrigerant compressor 50B, condenser 71, pressure reducing device 72, and evaporator 73 are connected in this order in a ring by piping 74 through which the refrigerant gas flows, thereby forming a refrigeration cycle. The configuration of the condenser 71, pressure reducing device 72, evaporator 73, piping 74, main body housing, blower, operating unit, control unit, etc., is not particularly limited, and known configurations can be suitably used. Furthermore, the refrigerator 70 may also have other known configurations.

[0086] An example of the operation of the refrigerator 70 shown in Figure 12(B) will be explained in detail. The refrigerant compressor 50B compresses the gaseous refrigerant and discharges it to the condenser 71. The condenser 71 cools the gaseous refrigerant to liquid refrigerant. The liquid refrigerant is depressurized by passing through the depressurization device 72 and sent to the evaporator 73. In the evaporator 73, the liquid refrigerant vaporizes by absorbing heat from the surroundings, becoming gaseous refrigerant and returning to the refrigerant compressor 50B. The refrigerant compressor 50B compresses the gaseous refrigerant and discharges it back to the condenser 71.

[0087] As described above, the refrigerant compressor 50B of the refrigerator 70 according to this third embodiment is not particularly limited in its specific configuration, as long as it is equipped with an electric unit 51 using the stator 10 according to the first embodiment (or an electric motor 14 according to the second embodiment is used as the electric unit 51). Typically, the refrigerant compressor 50B can be one in which the compression unit 53 is of the reciprocating type.

[0088] It should be noted that the application devices related to this disclosure are not limited to refrigeration cycle systems such as the aforementioned air conditioner 60 or refrigerator 70. Other typical application devices include various devices such as blowers, pumps, and power sources for vehicle propulsion.

[0089] (Note) Based on the above description of embodiments, the following technologies are disclosed in this specification. (Technical 1) The device comprises a core configured by arranging a plurality of segmented cores in a ring, each segmented core having teeth that protrude inward in the circumferential direction, with slots formed between adjacent teeth; a pair of insulators that cover and insulate both axial end faces of the segmented cores; a coil formed by winding wire around the teeth via the insulators; and an insulating sheet that insulates the space between the segmented core and the coil. The segmented core has a yoke portion that extends in the circumferential direction of the core; the teeth portion protrudes from the inner surface of the yoke portion and has a pair of umbrella portions that extend outward from both circumferential edges at the protruding end; the pair of insulators has an extended structure portion that covers part of the sides of the pair of umbrella portions in addition to both end faces of the segmented core; the extended structure portion has a groove portion adjacent to the side covering surface that opens toward the slot, and the side edge portion of the insulating sheet is inserted into the groove portion.

[0090] According to the above configuration, when attaching the insulating sheet to the divided core, both ends of the axial side edges (tip portions) of the insulating sheet are inserted into the grooves of the stretched structure portion of the insulator. At this time, since the grooves are adjacent to the side covering surface and face the slots, the insulating sheet can be easily positioned simply by inserting the side edges of the insulating sheet into the grooves and bringing them into contact with the bottom surface of the grooves.

[0091] This allows for the mitigation or avoidance of complex manufacturing processes without requiring a complex structure for the insulating sheet. Therefore, the stator manufacturing process can be made more efficient. Furthermore, because the process of attaching the insulating sheet to the segmented core is efficient, it becomes possible to automate the insulating sheet attachment process.

[0092] Furthermore, with the above configuration, the inner surface of the groove and the inner surface of the extension structure adjacent to the groove are at creepage distance, so a good insulation distance can be secured between the yoke and the coil inside the slot. This makes it possible to shorten the distance from the inner surface of the divided core to the coil. As a result, the cross-sectional area of ​​the slot in the left-right direction (direction perpendicular to the axial direction) can be increased, making it possible to increase the number of wire turns. Consequently, the efficiency of the electric motor equipped with the stator according to this disclosure can be made even better.

[0093] (Technical 2) The stator according to Technical 1, wherein a taper is provided on the opening side of the groove.

[0094] (Technical 3) The stator according to Technical 1 or 2, wherein the axial dimension of the insulating sheet is longer than the axial dimension of the divided core.

[0095] (Technical 4) The stator according to Technical 3, wherein the insulator has an end-face covering surface that covers the end face of the divided core, a recess between the stretched structure and the end-face covering surface, the recess has an extending groove that is integrally connected to the groove, and the side edge of the insulating sheet is inserted into the groove and the extending groove.

[0096] (Technical 5) The stator according to Technical 4, wherein the axial movement of the insulating sheet is restricted by fitting both axial ends of the insulating sheet into the recessed areas.

[0097] (Technical 6) The stator according to any one of Technical 1 to Technical 4, wherein the insulating sheet has a pair of end extensions extending from a portion covering the inner surface of the yoke portion in one and the other axial direction, and a bent portion extending from the end extensions and bending outward opposite to the radially inward direction, and the insulator has a recess that is recessed from its inner surface and into which the bent portion is fitted.

[0098] (Technical 7) The stator according to any one of Technical 1 to Technical 6, wherein the spacing of the grooves is 1.2 times or more the thickness of the insulating sheet.

[0099] (Technical 8) The stator according to any one of Technical 1 to Technical 7, wherein the length of the extended structural part is equal to or greater than the insulation distance specified by law or standard.

[0100] (Technical 9) The stator according to any one of Technical 4 to Technical 8, wherein the depth of the recess is equal to or greater than the insulation distance specified by law or standard.

[0101] (Technical 10) An electric motor comprising a stator as described in any of Technical 1 to 9.

[0102] (Technical 11) An electric motor as described in Technical 10, wherein the number of slots is 9 or more or the number of poles is 8 or more.

[0103] (Technical 12) A refrigerant compressor equipped with an electric motor as described in Technical 10 or Technical 11 as the electric unit.

[0104] (Technical 13) An air conditioner equipped with the refrigerant compressor described in Technical 12.

[0105] (Technical 14) A refrigerator equipped with the refrigerant compressor described in Technical 12.

[0106] This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Therefore, embodiments obtained by appropriately combining the technical means disclosed in different embodiments or multiple modifications are also included in the technical scope of this disclosure. [Industrial applicability]

[0107] This disclosure can be broadly and suitably used in the field of motor rotors or motors, and further in the field of applied equipment that includes motors or motor components using stators. [Explanation of Symbols]

[0108] 10: Stator 11: York 11a: Axis 12: Segment 13: Coil 13a: Wire 14: Electric motor 15: Rotor 18: Core 20: Split Cores 21: York 22: Teeth Department 22a:Protruding side end 22b: Umbrella part 30: Insulator 31: Outer flange section 32: Torso 33: Inner flange section 34: End coated surface 35: Locking recess 36: Stretched structure part 36a:Groove 36b: Side covered surface 36c: Recessed part 36d: Extension groove 36e: Tapered section 40: Insulating sheet 40a: Side edge of the insulating sheet 41: First insulating section 42: Second insulation section 43: Third insulation section 44: End extension 45: Bending section 50A, 50B: Refrigerant compressor 51: Electric part 52, 53: Compression section 60: Air conditioner 70: Refrigerator

Claims

1. A core comprising multiple segmented cores arranged in a ring, each of which has teeth protruding inward in the circumferential direction, with slots formed between adjacent teeth, A pair of insulators that cover and insulate both axial end faces of the divided core, A coil formed by winding a wire around the teeth portion via the insulator, The system includes an insulating sheet that insulates the space between the divided core and the coil, The divided core has a yoke portion that extends in the circumferential direction of the core, The teeth portion protrudes from the inner surface of the yoke portion and has a pair of umbrella portions that extend outward from both circumferential edges at the protruding end. Each pair of insulators has an extended structure having side covering surfaces that cover a portion of the sides of the pair of umbrella portions, in addition to the end faces of the divided core. The extended structure portion has a groove portion adjacent to the side covering surface that opens toward the slot, The groove portion is characterized in that the side edge portion of the insulating sheet is inserted into it. stator.

2. The opening of the groove is provided with a taper. The stator according to claim 1.

3. The axial dimension of the insulating sheet is longer than the axial dimension of the divided core. The stator according to claim 1.

4. The insulator has an end-face covering surface that covers the end face of the divided core, There is a recess between the extended structure and the end face covering surface. The recessed portion has an extended groove portion that is integrally connected to the groove portion, The side edges of the insulating sheet are inserted into the groove and the stretched groove. The stator according to claim 3.

5. The axial movement of the insulating sheet is restricted by fitting both axial ends of the insulating sheet into the recessed areas. The stator according to claim 4.

6. The aforementioned insulating sheet is A pair of end extensions extending from the portion covering the inner surface of the yoke portion, one in the axial direction and the other in the axial direction, It has a bent portion that extends from the end extension and bends outward in the opposite direction to the radial inward direction, The insulator has a recess that is recessed from its inner surface and into which the bent portion is fitted. The stator according to claim 1.

7. The spacing between the grooves is 1.2 times or more the thickness of the insulating sheet. The stator according to claim 1.

8. The length of the extended structural part is equal to or greater than the insulation distance specified in laws or standards. The stator according to claim 1.

9. The depth of the recess is equal to or greater than the insulation distance specified in laws or standards. The stator according to claim 4.

10. An electric motor comprising a stator according to any one of claims 1 to 9.

11. The electric motor according to claim 10, wherein the number of slots is 9 or more or the number of poles is 8 or more.

12. A refrigerant compressor comprising the electric motor described in claim 10 as an electric unit.

13. An air conditioner comprising the refrigerant compressor according to claim 12.

14. A refrigerator comprising the refrigerant compressor according to claim 12.

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