Stator for motor

Abstract

This stator for a motor comprises: a coil bobbin that includes a cylindrical part having an outer diameter part, and a partition plate provided on the outer diameter part; winding wound around the partition plate; and a tight binding thread for binding a coil end part of the winding. The cylindrical part has an axial center portion, in which the outer diameter part is present, and an axial end portion, in which the outer diameter part is not present and which corresponds to the coil end part. The axial end portion has a notch capable of accommodating at least a portion of the tight binding thread.

Description

Stator for electric motor

[0001] The present disclosure relates to a stator for an electric motor.

[0002] Coil bobbins are sometimes used to secure the windings (coils) of electric motor stators. The axial ends (coil ends) of the coil wound around the coil bobbin are shaped (formed) using a jig. The coil wound around the coil bobbin is then subjected to a process to secure the coil, such as impregnation. The length of the axial cylindrical portion of the coil bobbin is longer than the length of the axial partition plate of the coil bobbin (see, for example, Japanese Patent Application Laid-Open No. 2009-183043). This prevents the coil ends from protruding toward the inner diameter of the coil bobbin during molding or hardening of the impregnating material. Also known is a lacing technique that binds the coil ends with binding thread (see, for example, Japanese Patent Application Laid-Open No. 2006-33967).

[0003] JP 2009-183043 A JP 2006-33967 A

[0004] When molding a coil end portion using a jig without using a binding thread, if the force applied to the coil end portion by the jig is increased, the force is also applied to the coil bobbin, creating a risk of damaging the coil bobbin. Furthermore, if a binding thread is not used, residual stress in the coil end portion may cause significant dimensional change in the coil end portion during the impregnation process. Even if an attempt is made to bind the coil end portion of a coil wound around a coil bobbin with a binding thread, conventional technology (conventional coil bobbin configurations) does not provide a gap between the coil end portion of the coil and the cylindrical portion of the coil bobbin through which the binding thread can be passed. Therefore, the coil end portion cannot be bound with the binding thread. As a result, conventional technology is unable to mold a coil end portion while minimizing the risk of damaging the coil bobbin (without increasing the force applied to the coil end portion), and is unable to suppress dimensional change in the coil end portion during the impregnation process. A technology is desired that can mold a coil end portion while minimizing the risk of damaging the coil bobbin and suppress dimensional change in the coil end portion during the impregnation process.

[0005] One aspect of the present disclosure is a stator for an electric motor, comprising: a coil bobbin having a cylindrical portion with an outer diameter portion and a partition plate provided on the outer diameter portion; a winding wound around the partition plate; and a binding thread binding a coil end portion of the winding; the cylindrical portion having an axial center portion where the outer diameter portion is present, and an axial end portion where the outer diameter portion is not present and corresponds to the coil end portion, and the axial end portion has a notch capable of accommodating at least a portion of the binding thread.

[0006] 1 is a diagram showing an example of an electric motor stator 1 according to a first embodiment, viewed from one axial side of a coil bobbin 11 constituting a part of the electric motor stator 1. FIG. 2 is a diagram showing a schematic planar development of the electric motor stator 1 shown in FIG. 1. FIG. 3 is a schematic perspective view of the coil bobbin 11 shown in FIGS. 1 and 2. FIG. 4 is a schematic perspective view of an example of a coil bobbin 11 constituting a part of the electric motor stator 1 according to a second embodiment. FIG. 5 is a schematic planar development of an example of an electric motor stator 1 according to a third embodiment. FIG. 6 is a schematic perspective view of the coil bobbin 11 shown in FIG. 5. FIG. 7 is a schematic planar development of a part of the electric motor stator 1 according to a fourth embodiment. FIG. 8 is a schematic perspective view of the coil bobbin 11 shown in FIG.

[0007] Hereinafter, an embodiment of an electric motor stator according to the present disclosure will be described with reference to the accompanying drawings.

[0008] First Embodiment FIG. 1 is a view of an example of an electric motor stator 1 according to a first embodiment, viewed from one axial side of a coil bobbin 11 that constitutes a part of the electric motor stator 1. FIG. 2 is a schematic planar view of the electric motor stator 1 shown in FIG. 1 . FIG. 3 is a schematic perspective view of the coil bobbin 11 shown in FIGS. 1 and 2. In the example shown in FIGS. 1 to 3, the electric motor stator 1 includes a coil bobbin 11, windings 12-1 to 12-3, and binding threads 13-11 to 13-16, 13-21 to 13-26. The coil bobbin 11 includes a cylindrical portion 11A and partition plates 11B-1 to 11B-6. In the example shown in FIGS. 1 to 3, the coil bobbin 11 includes six partition plates 11B-1 to 11B-6, but in other examples, the coil bobbin 11 may include any number of partition plates other than six.

[0009] 1 to 3, cylindrical portion 11A has outer diameter portions 11A11-1 to 11A11-6, which are portions where partition plates 11B-1 to 11B-6 are provided. Windings 12-1 to 12-3 are wound in a distributed manner around partition plates 11B-1 to 11B-6. Specifically, as shown in FIGS. 1 and 2, winding 12-1 is wound across three partition plates 11B-2, 11B-3, and 11B-4, winding 12-2 is wound across three partition plates 11B-4, 11B-5, and 11B-6, and winding 12-3 is wound across three partition plates 11B-6, 11B-1, and 11B-2. In the example shown in Figures 1 to 3, each of the windings 12-1 to 12-3 is wound in a distributed manner across three partition plates, but in other examples, each of the windings may be wound in a distributed manner across any number of partition plates other than three.

[0010] 1 to 3, the coil end portion 12A-1 of the winding 12-1 and the coil end portion 12A-1 of the winding 12-3 on one side (the upper side in FIG. 2) of the axial direction (the vertical direction in FIG. 2) of the cylindrical portion 11A of the coil bobbin 11 are bound by binding threads 13-11 and 13-12. The coil end portion 12A-1 of the winding 12-1 and the coil end portion 12A-1 of the winding 12-2 are bound by binding threads 13-13 and 13-14. The coil end portion 12A-1 of the winding 12-2 and the coil end portion 12A-1 of the winding 12-3 are bound by binding threads 13-15 and 13-16. The coil end portions 12A-2 of the winding 12-1 and 12A-2 of the winding 12-3 on the other side (lower side in FIG. 2) of the axial direction (vertical direction in FIG. 2) of the cylindrical portion 11A of the coil bobbin 11 are bound by binding threads 13-21 and 13-22. The coil end portions 12A-2 of the winding 12-1 and 12A-2 of the winding 12-2 are bound by binding threads 13-23 and 13-24. The coil end portions 12A-2 of the winding 12-2 and 12A-2 of the winding 12-3 are bound by binding threads 13-25 and 13-26.

[0011] As shown in Figures 2 and 3, the cylindrical portion 11A of the coil bobbin 11 has an axial center portion 11A1 and axial end portions 11A2-1 and 11A2-2. The axial center portion 11A1 is the portion where the outer diameter portions 11A11-1 to 11A11-6, on which the partition plates 11B-1 to 11B-6 are provided, are located. The axial end portion 11A2-1 is the portion where the outer diameter portions 11A11-1 to 11A11-6 are not located and corresponds to the coil end portion 12A-1 of the windings 12-1 to 12-3. The axial end portion 11A2-2 is the portion where the outer diameter portions 11A11-1 to 11A11-6 are not located and corresponds to the coil end portion 12A-2 of the windings 12-1 to 12-3. The axial end portion 11A2-1 functions to prevent the coil end portions 12A-1 of the windings 12-1 to 12-3 from protruding radially inward beyond the cylindrical portion 11A of the coil bobbin 11. To facilitate understanding of the correspondence between the binding threads 13-11 to 13-16 and the notches 11A2-11 to 11A2-16 (described later), the axial end portion 11A2-1 does not overlap the coil end portions 12A-1 of the windings 12-1 to 12-3 in the example shown in FIG. 2 . However, preferably, the axial end portion 11A2-1 overlaps at least a portion of the coil end portions 12A-1 of the windings 12-1 to 12-3. The axial end portion 11A2-2 also functions to prevent the coil end portions 12A-2 of the windings 12-1 to 12-3 from protruding radially inward beyond the cylindrical portion 11A of the coil bobbin 11. In order to facilitate understanding of the correspondence between the binding threads 13-21 to 13-26 and the notches 11A2-21 to 11A2-26 described later, the axial end portion 11A2-2 does not overlap with the coil end portions 12A-2 of the windings 12-1 to 12-3 in the example shown in Fig. 2, but preferably the axial end portion 11A2-2 overlaps with at least a portion of the coil end portions 12A-2 of the windings 12-1 to 12-3. As shown in Fig. 2, the length L1 of the cylindrical portion 11A in the axial direction of the coil bobbin 11 (the vertical direction in Fig. 2) is greater than the length L2 of the partition plates 11B-1 to 11B-6 in the axial direction of the coil bobbin 11.

[0012] 1 and 2, the axial end 11A2-1 of the cylindrical portion 11A of the coil bobbin 11 has a notch 11A2-11 that can accommodate at least a portion of the binding thread 13-11. Therefore, in the example shown in FIGS. 1 to 3, during the manufacture of the electric motor stator 1 (specifically, before the coil end portions 12A-1 of the windings 12-1 to 12-3 are formed), the binding thread 13-11 can be passed through the notch 11A2-11 to bind the coil end portions 12A-1 of the windings 12-1 and 12-3. The position of the notch 11A2-11 in the circumferential direction of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-1 and 11B-2 that are adjacent to each other in the circumferential direction of the coil bobbin 11. The notch 11A2-11 can accommodate the portion of the binding thread 13-11 that faces the axial end 11A2-1 (i.e., the portion that would be sandwiched between the coil end portion 12A-1 of the windings 12-1, 12-3 and the outer surface of the axial end 11A2-1 of the cylindrical portion 11A of the coil bobbin 11 if the notch 11A2-11 did not exist).

[0013] 1 and 2, the axial end 11A2-1 of the cylindrical portion 11A of the coil bobbin 11 has notches 11A2-12 to 11A2-16 that can accommodate at least a portion of the binding threads 13-12 to 13-16. Therefore, in the example shown in Figures 1 to 3, during the manufacture of the electric motor stator 1 (more specifically, before the coil end portions 12A-1 of the windings 12-1 to 12-3 are molded), the binding threads 13-12 to 13-16 can be passed through the notches 11A2-12 to 11A2-16 to bind the coil end portions 12A-1 of the windings 12-1 to 12-3. The position of the circumferential notch 11A2-12 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-2 and 11B-3 adjacent to the coil bobbin 11 in the circumferential direction, and the position of the circumferential notch 11A2-13 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-3 and 11B-4 adjacent to the coil bobbin 11 in the circumferential direction. Furthermore, the position of circumferential notch 11A2-14 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-4 and 11B-5 that are adjacent in the circumferential direction of the coil bobbin 11, the position of circumferential notch 11A2-15 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-5 and 11B-6 that are adjacent in the circumferential direction of the coil bobbin 11, and the position of circumferential notch 11A2-16 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-6 and 11B-1 that are adjacent in the circumferential direction of the coil bobbin 11. The notches 11A2-12 to 11A2-16 can accommodate the portions of the binding threads 13-12 to 13-16 that face the axial end 11A2-1.

[0014] 2, the axial end 11A2-2 of the cylindrical portion 11A of the coil bobbin 11 has notches 11A2-21 to 11A2-26 that can accommodate at least a portion of the binding threads 13-21 to 13-26. Therefore, in the example shown in FIGS. 1 to 3, during the manufacture of the electric motor stator 1 (more specifically, before the coil end portions 12A-2 of the windings 12-1 to 12-3 are molded), the binding threads 13-21 to 13-26 can be passed through the notches 11A2-21 to 11A2-26 to bind the coil end portions 12A-2 of the windings 12-1 to 12-3. The position of the circumferential notch 11A2-21 of the coil bobbin 11 roughly coincides with the midpoint between two circumferentially adjacent partition plates 11B-1 and 11B-2 of the coil bobbin 11, the position of the circumferential notch 11A2-22 of the coil bobbin 11 roughly coincides with the midpoint between two circumferentially adjacent partition plates 11B-2 and 11B-3 of the coil bobbin 11, and the position of the circumferential notch 11A2-23 of the coil bobbin 11 roughly coincides with the midpoint between two circumferentially adjacent partition plates 11B-3 and 11B-4 of the coil bobbin 11. Furthermore, the position of the circumferential notch 11A2-24 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-4 and 11B-5 that are adjacent in the circumferential direction of the coil bobbin 11, the position of the circumferential notch 11A2-25 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-5 and 11B-6 that are adjacent in the circumferential direction of the coil bobbin 11, and the position of the circumferential notch 11A2-26 of the coil bobbin 11 roughly coincides with the midpoint between two partition plates 11B-6 and 11B-1 that are adjacent in the circumferential direction of the coil bobbin 11. The notches 11A2-21 to 11A2-26 can accommodate the portions of the binding threads 13-21 to 13-26 that face the axial end 11A2-2.

[0015] 1 to 3, the windings 12-1 to 12-3 are formed by binding the coil end portions 12A-1, 12A-2 with binding threads 13-11 to 13-16, 13-21 to 13-26 that are passed through the notches 11A2-11 to 11A2-16, 11A2-21 to 11A2-26. As a result, in the example shown in Figures 1 to 3, the coil end portions 12A-1, 12A-2 can be formed with a reduced risk of damage to the coil bobbin 11 compared to when the coil end portions 12A-1, 12A-2 cannot be bound with the binding threads 13-11 to 13-16, 13-21 to 13-26, and dimensional changes in the coil end portions 12A-1, 12A-2 during the impregnation process can be suppressed.

[0016] 4 is a schematic perspective view of an example of a coil bobbin 11 constituting a part of an electric motor stator 1 according to a second embodiment. The electric motor stator 1 according to the second embodiment has the same configuration as the electric motor stator 1 according to the first embodiment, except for the points described below.

[0017] 2 and 3, in the coil bobbin 11 of the electric motor stator 1 of the first embodiment, the notch 11A2-11 is present only at the axial end 11A2-1 of the cylindrical portion 11A, and is not present at the axial central portion 11A1 or the axial end 11A2-2 of the cylindrical portion 11A. In other words, the notch 11A2-11 extends into the axial end 11A2-1 of the cylindrical portion 11A. On the other hand, as shown in FIG. 4, in the coil bobbin 11 of the electric motor stator 1 of the second embodiment, the notch 11A2-11 extends across the axial end 11A2-1 and the axial central portion 11A1 of the cylindrical portion 11A. Therefore, in the electric motor stator 1 of the second embodiment, the large-sized notches 11A2-11 ensure sufficient clearance for passing the binding threads 13-11 that bind the coil end portions 12A-1 of the windings 12-1 and 12-3, facilitating the task of binding the coil end portions 12A-1 of the windings 12-1 and 12-3 with the binding threads 13-11. Also, as shown in FIG. 4, in the coil bobbin 11 of the electric motor stator 1 of the second embodiment, the notches 11A2-12 to 11A2-16 extend across the axial end portion 11A2-1 and the axial center portion 11A1 of the cylindrical portion 11A. Furthermore, the notches 11A2-21 to 11A2-23 extend across the axial end portion 11A2-2 and the axial center portion 11A1 of the cylindrical portion 11A. Although not shown in FIG. 4, the notches 11A2-24 to 11A2-26 (see FIG. 2) also extend across the axial end portion 11A2-2 and the axial center portion 11A1 of the cylindrical portion 11A, similar to the notches 11A2-21 to 11A2-23.

[0018] <Third embodiment> Fig. 5 is a diagram schematically showing an example of an electric motor stator 1 according to a third embodiment, developed on a plane. Fig. 6 is a schematic perspective view of the coil bobbin 11 shown in Fig. 5. The electric motor stator 1 according to the third embodiment has the same configuration as the electric motor stator 1 according to the first embodiment, except for the points described below.

[0019] As described above, in the example shown in Figures 1 to 3, the motor stator 1 includes windings 12-1 to 12-3. On the other hand, in the example shown in Figures 5 and 6, the motor stator 1 includes windings 12-1 to 12-6. The windings 12-1 to 12-6 are wound around partition plates 11B-1 to 11B-6 by concentrated winding. That is, as shown in Figure 5, the winding 12-1 is wound around partition plate 11B-1, the winding 12-2 is wound around partition plate 11B-2, the winding 12-3 is wound around partition plate 11B-3, the winding 12-4 is wound around partition plate 11B-4, the winding 12-5 is wound around partition plate 11B-5, and the winding 12-6 is wound around partition plate 11B-6.

[0020] 5 and 6, the coil end portion 12A-1 of the winding 12-1 on one side (upper side in FIG. 5) of the axial direction of the cylindrical portion 11A of the coil bobbin 11 (vertical direction in FIG. 5) is bound by a binding thread 13-11. The coil end portion 12A-1 of the winding 12-2 is bound by a binding thread 13-12, and the coil end portion 12A-1 of the winding 12-3 is bound by a binding thread 13-13. The coil end portions 12A-1 of the windings 12-4 to 12-6 are bound by binding threads 13-14 to 13-16. The coil end portion 12A-2 of the winding 12-1 on the other side (lower side in FIG. 5) of the axial direction of the cylindrical portion 11A of the coil bobbin 11 (vertical direction in FIG. 5) is bound by a binding thread 13-21. The coil end portions 12A-2 of the windings 12-2 to 12-6 are bound by binding threads 13-22 to 13-26.

[0021] As shown in Figures 5 and 6, axial end portion 11A2-1 is a portion where outer diameter portions 11A11-1 to 11A11-6 are not present and corresponds to coil end portion 12A-1 of windings 12-1 to 12-6. Axial end portion 11A2-2 is a portion where outer diameter portions 11A11-1 to 11A11-6 are not present and corresponds to coil end portion 12A-2 of windings 12-1 to 12-6. In the example shown in Figures 5 and 6, length L1 (see Figure 2) of cylindrical portion 11A in the axial direction (vertical direction in Figure 5) of coil bobbin 11 is greater than length L2 (see Figure 2) of partition plates 11B-1 to 11B-6 in the axial direction of coil bobbin 11.

[0022] 5 and 6, during the manufacture of the electric motor stator 1 (specifically, before the coil end portions 12A-1 of the windings 12-1 to 12-6 are formed), the binding thread 13-11 can be passed through the notch 11A2-11 to bind the coil end portion 12A-1 of the winding 12-1. As shown in FIGS. 5 and 6, the notch 11A2-11 and the partition plate 11B-1 are arranged at approximately the same position in the circumferential direction of the coil bobbin 11. The notch 11A2-11 can accommodate the portion of the binding thread 13-11 that faces the axial end portion 11A2-1 (i.e., the portion that would be sandwiched between the coil end portion 12A-1 of the winding 12-1 and the outer circumferential surface of the axial end portion 11A2-1 of the cylindrical portion 11A of the coil bobbin 11 if the notch 11A2-11 were not present).

[0023] 5 and 6, during the manufacture of the motor stator 1 (specifically, before the coil end portions 12A-1 of the windings 12-1 to 12-6 are formed), the binding threads 13-12 to 13-16 can be passed through the notches 11A2-12 to 11A2-16 to bind the coil end portions 12A-1 of the windings 12-1 to 12-6. The notches 11A2-12 to 11A2-16 and the partition plates 11B-2 to 11B-6 are arranged at approximately the same positions in the circumferential direction of the coil bobbin 11.

[0024] 5 and 6, during the manufacture of the electric motor stator 1 (specifically, before the coil end portions 12A-2 of the windings 12-1 to 12-6 are formed), binding threads 13-21 to 13-26 are passed through the notches 11A2-21 to 11A2-26, thereby allowing the binding threads 13-21 to 13-26 to bind the coil end portions 12A-2 of the windings 12-1 to 12-6. The notches 11A2-21 to 11A2-26 and the partition plates 11B-1 to 11B-6 are arranged in approximately the same positions circumferentially on the coil bobbin 11. In the example shown in FIGS. 5 and 6, the coil bobbin 11 includes six partition plates 11B-11 to 11B-6, as in the other figures. However, in other examples, any number of partition plates other than six may be included depending on the number of poles and the winding connections.

[0025] <Fourth embodiment> Fig. 7 is a diagram showing a part of an electric motor stator 1 according to a fourth embodiment, developed on a plane. Fig. 8 is a schematic perspective view of the coil bobbin 11 shown in Fig. 7. The electric motor stator 1 according to the fourth embodiment has the same configuration as the electric motor stator 1 according to the first embodiment, except for the points described below.

[0026] 7 and 8, the motor stator 1 includes a coil bobbin 11, windings 12-1, and binding threads 13-11, 13-21, etc. The windings 12-1 are wound in a distributed manner around the partition plates 11B-1 to 11B-6. Specifically, as shown in FIG. 7, the winding 12-1 is wound across the three partition plates 11B-1, 11B-2, and 11B-3.

[0027] 7 and 8, the coil end portion 12A-1 of the winding 12-1 on one side (upper side in FIG. 7) of the axial direction of the cylindrical portion 11A of the coil bobbin 11 (vertical direction in FIG. 7) is bound in a spiral shape by a binding thread 13-11. The coil end portion 12A-2 of the winding 12-1 on the other side (lower side in FIG. 7) of the axial direction of the cylindrical portion 11A of the coil bobbin 11 (vertical direction in FIG. 7) is bound in a spiral shape by a binding thread 13-21.

[0028] 7 and 8, the axial end 11A2-1 of the cylindrical portion 11A of the coil bobbin 11 has a plurality of notches 11A2-11 that can accommodate at least a portion of the binding thread 13-11 that is wound spirally around the coil end portion 12A-1 of the winding 12-1. Therefore, in the example shown in Figures 7 and 8, during the manufacture of the electric motor stator 1 (more specifically, before the coil end portion 12A-1 of the winding 12-1 is molded), the binding thread 13-11 can be passed through the plurality of notches 11A2-11 to bind the coil end portion 12A-1 of the winding 12-1 in a spiral shape. The multiple notches 11A2-11 can accommodate the portion of the spirally wound binding thread 13-11 that faces the axial end 11A2-1 (i.e., the portion that would be sandwiched between the coil end portion 12A-1 of the winding 12-1 and the outer surface of the axial end 11A2-1 of the cylindrical portion 11A of the coil bobbin 11 if the multiple notches 11A2-11 were not present).

[0029] 7 and 8, the axial end 11A2-2 of the cylindrical portion 11A of the coil bobbin 11 has a plurality of notches 11A2-21 that can accommodate at least a portion of the binding thread 13-21 that is wound helically around the coil end portion 12A-2 of the winding 12-1. Therefore, in the example shown in FIGS. 7 and 8, during the manufacture of the electric motor stator 1 (specifically, before the coil end portion 12A-2 of the winding 12-1 is molded), the binding thread 13-21 can be passed through the plurality of notches 11A2-21 to bind the coil end portion 12A-2 of the winding 12-1 in a helical shape. The plurality of notches 11A2-21 can accommodate the portion of the helically wound binding thread 13-21 that faces the axial end 11A2-2.

[0030] Although the embodiments of the electric motor stator of the present disclosure have been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible to these embodiments without departing from the gist of the invention or the concept and spirit of the present invention derived from the content of the claims and their equivalents. For example, in the above-described embodiments, the order of each process is shown as an example and is not limited to these. The same applies when numerical values ​​are used in the description of the above-described embodiments. Furthermore, appropriate combinations of several of the above-described embodiments are within the scope of the present disclosure.

[0031] The following supplementary notes are further disclosed regarding the above-described embodiments and modifications: (Supplementary Note 1) A coil bobbin (11) including a cylindrical portion (11A) having outer diameter portions (11A11-1 to 11A11-6) and partition plates (11B-1 to 11B-6) provided on the outer diameter portions (11A11-1 to 11A11-6), windings (12-1 to 12-6) wound around the partition plates (11B-1 to 11B-6), and binding strings (13-11 to 13-16, 13-21 to 13-26) binding coil end portions (12A-1, 12A-2) of the windings (12-1 to 12-6), The cylindrical portion (11A) has an axial center portion (11A1) where the outer diameter portions (11A11-1 to 11A11-6) are present, and axial end portions (11A2-1, 11A2-2) where the outer diameter portions (11A11-1 to 11A11-6) are not present and which correspond to the coil end portions (12A-1, 12A-2), and the axial end portions (11A2-1, 11A2-2) have notches (11A2-11 to 11A2-16, 11A2-21 to 11A2-26) that can accommodate at least a part of the binding threads (13-11 to 13-16, 13-21 to 13-26). (Supplementary Note 2) The electric motor stator (1) according to Supplementary Note 1, wherein the windings (12-1 to 12-6) are formed by binding the coil end portions (12A-1, 12A-2) with the binding threads (13-11 to 13-16, 13-21 to 13-26) that are passed through the notches (11A2-11 to 11A2-16, 11A2-21 to 11A2-26). (Supplementary Note 3) The electric motor stator (1) according to Supplementary Note 1 or 2, wherein the notches (11A2-11 to 11A2-16, 11A2-21 to 11A2-26) extend across the axial end portions (11A2-1, 11A2-2) and the axial central portion (11A1). (Appendix 4) The electric motor stator (1) according to Appendix 1 or 2, wherein the windings (12-1 to 12-6) are wound around the partition plates (11B-1 to 11B-6) by concentrated winding, and the notches (11A2-11 to 11A2-16, 11A2-21 to 11A2-26) and the partition plates (11B-1 to 11B-6) are arranged at approximately the same positions in the circumferential direction of the coil bobbin (11).(Appendix 5) The electric motor stator (1) according to any one of Appendices 1 to 3, wherein the windings (12-1 to 12-3) are wound in a distributed manner across a plurality of the partition plates (11B-1 to 11B-6), and the positions of the notches (11A2-11 to 11A2-16, 11A2-21 to 11A2-26) in the circumferential direction of the coil bobbin (11) roughly coincide with midpoints between two of the partition plates (11B-1 to 11B-6) adjacent to each other in the circumferential direction of the coil bobbin (11). (Appendix 6) The electric motor stator (1) according to any one of Appendices 1 to 5, wherein the notches (11A2-11 to 11A2-16, 11A2-21 to 11A2-26) can accommodate portions of the binding threads (13-11 to 13-16, 13-21 to 13-26) that face the axial ends (11A2-1, 11A2-2).

[0032] 1 Electric motor stator 11 Coil bobbin 11A Cylindrical portion 11A1 Axial center portion 11A11-1 to 11A11-6 Outer diameter portion 11A2-1, 11A2-2 Axial end portion 11A2-11 to 11A2-16 Notch 11A2-21 to 11A2-26 Notch 11B-1 to 11B-6 Partition plate 12-1, 12-2, 12-3, 12-4, 12-5, 12-6 Winding 12A-1, 12A-2 Coil end portion 13-11 to 13-16 Binding thread 13-21 to 13-26 Binding thread

Claims

1. A stator for an electric motor comprising: a coil bobbin having a cylindrical portion with an outer diameter portion and a partition plate provided on the outer diameter portion; a winding wound around the partition plate; and a binding thread binding a coil end portion of the winding, wherein the cylindrical portion has an axial center portion where the outer diameter portion is present, and an axial end portion where the outer diameter portion is not present and corresponds to the coil end portion, and the axial end portion has a notch capable of accommodating at least a portion of the binding thread.

2. The stator for an electric motor according to claim 1, wherein the winding is formed by binding the coil end portions with the binding thread passed through the notches.

3. The electric motor stator according to claim 1 or 2, wherein the notch extends across the axial end portion and the axial center portion.

4. A stator for an electric motor as claimed in claim 1 or 2, wherein the winding is wound around the partition plate in a concentrated winding manner, and the notch and the partition plate are arranged at approximately the same position in the circumferential direction of the coil bobbin.

5. A stator for an electric motor as described in claim 1 or 2, wherein the winding is wound in a distributed manner across a plurality of the partition plates, and the position of the notch in the circumferential direction of the coil bobbin roughly coincides with the midpoint between two of the partition plates adjacent in the circumferential direction of the coil bobbin.

6. A stator for an electric motor as set forth in claim 1 or 2, wherein said notch is capable of accommodating a portion of said binding thread that faces said axial end portion.

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