Stator spool and stator

Abstract

To simplify the insulation structure, of a stator core into which a coil is inserted, from a slot.SOLUTION: A stator spool according to an embodiment is made from an insulation material, is mounted on a tooth portion of a stator core of a rotary electric machine, and has a body portion around which a coil is wound and a flange portion which receives a coil end. The stator spool has a first split spool that is disposed on one end side in the thickness direction of the stator core, and a second split spool that is disposed on the other end side. The body portion of the second split spool is fitted to the outer side of the body portion of the first split spool in a slidable manner so that the total length can be adjusted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a stator spool made of an insulating material, attached to the teeth of a stator core of a rotating electric machine, and having a body portion around which a coil is wound and a flange portion that receives the coil end, and a stator equipped with the stator spool. [Background technology]

[0002] In rotating electrical machines, such as various motors, the stator is configured to include a stator core having a ring-shaped yoke and a plurality of teeth protruding inward from the yoke, and a coil housed in slots between the teeth. In this case, to achieve insulation between the rotor core and the coil, a plastic spool (insulator) divided into upper and lower halves is fitted to the teeth from both sides in the axial direction, and insulating paper is provided on the exposed parts of the slots (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-188675 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional stator core slot insulation structure described above requires two types of components for insulation: a spool and insulating paper, resulting in a large number of parts and increased assembly man-hours. In particular, inserting the insulating paper between the spool and core is tedious and time-consuming. The length of the insulating paper also needs to be changed to accommodate changes in the thickness of the stator core.

[0005] Therefore, the present invention provides a stator spool and a stator that can simplify the insulating structure for the slot portion of the stator core into which the coil is inserted. [Means for solving the problem]

[0006] The stator spool of this embodiment is made of an insulating material, is attached to the teeth of the stator core of a rotating electric machine, and has a body portion around which the coil is wound and a flange portion that receives the coil end.It has a first split spool arranged at one end side in the thickness direction of the stator core, and a second split spool arranged at the other end side, and the body portion of the second split spool is fitted so that it can slide and overlap the outside of the body portion of the first split spool, allowing the overall length to be adjusted. The stator of the embodiment has the above-described stator spool. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view showing an embodiment, schematically illustrating a main configuration of a stator. [Figure 2] FIG. 1 is a plan view showing a schematic configuration of a main part of a stator core; [Figure 3] FIG. 10 is an exploded perspective view showing the assembly of a spool to one tooth portion. [Figure 4] A vertical cross-sectional side view showing the state in which a spool is attached to one of the teeth [Figure 5] A longitudinal side view of the spool showing the overall length dimension at its smallest. [Figure 6] A longitudinal side view of the spool showing the maximum overall length dimension [Figure 7] Enlarged longitudinal side view showing the insulation lock structure DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment will be described below with reference to the drawings. FIG. 1 schematically shows the configuration of a portion of a stator 1 of a motor according to this embodiment. This stator 1 is configured by mounting a coil 3 on a stator core 2. As is well known, the stator core 2 is configured by laminating multiple electromagnetic steel sheets in the axial direction. As shown in FIG. 2, the stator core 2 is configured in an overall annular shape, and includes a ring-shaped yoke portion 4 on the outer periphery and multiple teeth 5 extending inward from the yoke portion 4. The teeth 5 are configured so that their inner ends are wider in the circumferential direction. The spaces between adjacent teeth 5 are called slots 6.

[0009] At this time, a coil 3 is wound around each tooth portion 5 via a stator spool 7 (hereinafter simply referred to as spool 7) made of insulating material. The coil 3 is housed in the slot 6 with the spool 7 insulating it from the stator core 2, and the coil ends are exposed from both the top and bottom surfaces of the stator core 2 in the drawing. Details of the spool 7 according to this embodiment will be described later. The stator core 2 may be provided as a single unit, or may be formed by combining split cores that are divided into individual teeth portions 5. Although not shown, the stator 1 is incorporated into a motor frame, and a rotor is disposed on its inner periphery to form a motor.

[0010] The spool 7 will now be described in detail with reference to Figures 3 to 7. In Figures 3 to 7, the axial direction of the stator core 2, i.e., the lamination direction (thickness direction) of the electromagnetic steel sheets, is defined as the up-down direction. The spool 7 is made of an insulating material, such as plastic, and in this embodiment, as shown in Figure 3 etc., has a first split spool 11 arranged at one end side (upper side in the figure) in the thickness direction, i.e., the axial direction, of the stator core 2, and a second split spool 12 arranged at the other end side (lower side in the figure) in the axial direction.

[0011] Of these, the first split spool 11 integrally has a first body portion 13 and a first flange portion 14. The first body portion 13 integrally has a rectangular ceiling plate that covers the top surface of the teeth portion 5 as viewed in the figure, and rectangular left and right side plates that cover the upper parts of the left and right sides of the teeth portion 5 as viewed in the figure, forming a roughly U-shape, and is attached to the teeth portion 5 so as to cover it from above. This first body portion 13, together with a second body portion described below, covers the teeth portion 5. By attaching the spool 7 to the teeth portion 5, the coil 3 can be wound around the spool 7 while ensuring insulation from the stator core 2.

[0012] The first flange portion 14 extends upward integrally from the two front and rear sides of the ceiling plate of the first body portion 13, has a plate shape disposed on the inner and outer circumferential sides of the teeth portion 5, and is configured to receive the coil end of the coil 3. The first flange portion 14 may be provided with a terminal to which the end of the coil 3 is connected, a holding portion to hold the crossover portion of the coil 3, and the like.

[0013] The second split spool 12 is substantially vertically symmetrical to the first split spool 11 and integrally includes a second body portion 15 and a second flange portion 16. The second body portion 15 integrally includes a rectangular bottom plate that covers the underside of the teeth portion 5 in the drawing and rectangular left and right side plates that cover the lower portions of the left and right side surfaces of the teeth portion 5 in the drawing, forming a substantially U-shape, and is attached to the teeth portion 5 so as to cover it from below. The second flange portions 16 are plate-shaped and extend downward integrally from two front and rear sides of the bottom plate of the second body portion 15, and are positioned on the inner and outer peripheral sides of the teeth portion 5, and are also configured to receive the coil ends of the coils 3.

[0014] 4, the second body portion 15 of the second split spool 12 is fitted to the outside of the first body portion 13 of the first split spool 11 so as to slidably overlap. In the teeth portion 5, the body portions 13, 15 are provided so as to overlap twice in the middle portion in the thickness direction of the stator core 2. In this way, when viewed as a whole, the body portions 13, 15 of the two split spools 11, 12 are fitted to each other so as to be slidable, so that the overall length dimension can be adjusted in accordance with the thickness dimension of the stator core 2.

[0015] Furthermore, particularly in this embodiment, an insulation lock structure 17 is provided between the outer surface of the first body portion 13 of the first split spool 11 and the inner surface of the second body portion 15 of the second split spool 12 that fits therewith. The insulation lock structure here refers to a structure in which, as shown in Fig. 7, concave-convex portions 17a that are alternately finely jagged in the fitting direction are formed on the outer surface of the first body portion 13 of the first split spool 11, and concave-convex portions 17b that are alternately finely jagged in the fitting direction are formed on the inner surface of the second body portion 15 of the second split spool 12, and these concave-convex portions 17a, 17b mesh together at some position to achieve positioning.

[0016] Next, the operation and effect of the stator 1 and spool 7 configured as described above will be described. In this embodiment, the spool 7 is divided into a first split spool 11 and a second split spool 12 in the thickness direction, i.e., the axial direction, of the stator core 2, and these are attached together to the teeth portion 5 of the stator core 2. At this time, the second body portion 15 of the second split spool 12 is fitted onto the outside of the first body portion 13 of the first split spool 11 so as to slidably overlap.

[0017] At this time, the overall length of the spool 7 can be adjusted by sliding the first split spool 11 relative to the second split spool 12 to change the amount of overlap between the fitted barrel sections 15, 13. The greater the amount of overlap between the barrel sections 13, 15, the shorter the overall length will be, and the smaller the amount of overlap, the longer the overall length will be. Figure 5 shows the state in which the amount of overlap between the barrel sections 13, 15 is maximized to minimize the overall length of the spool 7. Figure 6 shows the state in which the amount of overlap between the barrel sections 13, 15 is minimized to maximize the overall length of the spool 7.

[0018] In this way, it is possible to obtain spools 7 with lengths that correspond to the thicknesses of the split cores 2, and one type of spool 7 can accommodate a variety of thicknesses of the stator core 2. In this case, the spools 7 can cover the entire inner surfaces of the slots 6 of the stator core 2, so there is no need to supplement the spool's insulation with insulating paper as an insulating structure. As a result, the spool 7 of this embodiment has the excellent effect of eliminating the need for insulating paper and simplifying the insulation structure for the slots 6 of the stator core 2 into which the coils 3 are inserted.

[0019] In particular, in this embodiment, an insulation lock structure 17 is provided between the outer surface of the first body 13 of the first split spool 11 and the inner surface of the second body 15 of the second split spool 12, and positioning is performed by interlocking concave and convex portions 17a and 17b formed alternately in the movement direction. This makes it difficult for the body portions 13 and 15 to shift from their fitted positions, allowing for a temporary fastening, and improves the ease of handling and assembly of the spool 7.

[0020] In the embodiment described above, the insulation lock structure 17 is provided between the outer surface of the first body portion 13 of the first split spool 11 and the inner surface of the second body portion 15 of the second split spool 12, but the insulation lock structure 17 may be provided as needed. Various modifications are possible to the shape, structure, size, etc. of the flange portions 14, 16 of each split spool 11, 12. Furthermore, it goes without saying that the specific configuration, such as the number of slots in the stator core and the shape of the teeth, can also be modified as appropriate.

[0021] Although one embodiment of the present invention has been described above, this embodiment is presented by way of example and is not intended to limit the scope of the invention. This novel embodiment can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. This embodiment and its modifications are included within the scope and spirit of the invention, and are also included in the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0022] In the drawings, 1 indicates a stator, 2 indicates a stator core, 3 indicates a coil, 4 indicates a yoke portion, 5 indicates a teeth portion, 6 indicates a slot, 7 indicates a stator spool, 11 indicates a first split spool, 12 indicates a second split spool, 13 indicates a first body portion, 14 indicates a first flange portion, 15 indicates a second body portion, 16 indicates a second flange portion, 17 indicates an insulation lock structure, and 17a and 17b indicate uneven portions.

Claims

1. The coil is made of an insulating material, is attached to the teeth of the stator core of the rotating electric machine, and has a body portion around which a coil is wound, and a flange portion that receives the coil end, a first split spool disposed at one end side in a thickness direction of the stator core and a second split spool disposed at the other end side, the first split spool has a first body portion integrally having a ceiling plate covering an upper surface of the teeth portion and two side plates covering upper portions of side surfaces of the teeth portion so as to form a substantially U-shape; the second split spool has a second body portion integrally having a bottom plate covering a lower surface of the teeth portion and two side plates covering lower portions of side surfaces of the teeth portion so as to form a substantially U-shape; the top plate, the bottom plate, and the side plates cover the periphery of the teeth, The second body is fitted onto the outside of the first body so as to be slidably overlapped therewith, and the outer surface of the first body and the inner surface of the second body fitted onto the first body are formed with concave and convex portions that mesh with each other along the direction of movement, and the concave and convex portions mesh at any position to determine positioning, thereby adjusting the overall length of the stator spool so as to be able to accommodate a plurality of thickness dimensions of the stator core.

2. A stator comprising the stator spool of claim 1.

Images