stata

Abstract

In this stator (10): a pair of coil ends (32) include both end portions (34) of a coil (14) in the axial direction of a stator core (12); a pair of securing members (16) are inserted into gaps (40) between teeth (22) and the pair of coil ends (32) so as to contact the teeth (22) and both end portions (34), and secure the coil (14) to the stator core (12); the end portions (34) have a tapered shape that is inclined relative to the radial direction of the stator core (12); and the pair of securing members (16) are inclined along the tapered shape of the end portions (34).

Description

Technical Field

[0001] The present invention relates to a stator for a rotating electrical machine.

Background Art

[0002] A rotating electrical machine such as an electric motor or a generator includes a rotor and a stator. The stator includes a stator core and a plurality of coils. The stator core has a plurality of teeth. The coil is mounted on the teeth so as to wound around the teeth.

[0003] Japanese Patent No. 5391325 discloses a stator having a pair of positioning members. The pair of positioning members are attached to both end faces of the stator core in the axial direction. The positioning member has a plurality of return portions projecting axially from each tooth portion of the stator core. The coil is mounted on the tooth beyond the return portion.

Summary of the Invention

[0004] In the stator disclosed in Japanese Patent No. 5391325, since the positioning member is provided with the return portion, it is difficult to mount the coil on the teeth.

[0005] An object of the present invention is to solve the above-mentioned problem.

[0006] An aspect of the present invention is a stator comprising: a stator core having a plurality of teeth; and a plurality of coils mounted on the plurality of teeth so as to respectively wound around the plurality of teeth, wherein a pair of coil ends include both end portions of the coil in an axial direction of the stator core, the stator includes a pair of fixing members that are inserted into gaps between the teeth and the pair of coil ends so as to be in contact with the teeth and the both end portions, and fix the coils to the stator core, the both end portions have a tapered shape inclined with respect to a radial direction of the stator core, and the pair of fixing members are inclined along the tapered shape of the both end portions.

[0007] According to the present invention, the coil can be easily attached to and fixed to the stator core. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the stator of the first embodiment. [Figure 2] Figure 2 is a diagram showing a portion of the stator's configuration as viewed from the axis. [Figure 3] Figure 3 is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] Figure 4 is a perspective view of a pair of fixing members according to the first embodiment. [Figure 5] Figure 5 shows the stator of the second embodiment. [Figure 6] Figure 6 is a perspective view of a pair of fixing members according to the second embodiment. [Figure 7] Figure 7 shows the stator of the third embodiment. [Modes for carrying out the invention]

[0009] [1 First Embodiment] Figure 1 is a perspective view of a stator 10 of the first embodiment. The stator 10 is incorporated into an inner rotor type rotating electric machine (motor or generator). The stator 10 comprises a stator core 12, a plurality of coils 14, and a plurality of fixing members 16. Of the stator core 12, at least a plurality of teeth 22, a plurality of coils 14, and a plurality of fixing members 16 are fixed with resin by using a mold. In Figure 1, the resin is omitted.

[0010] In the following explanation, "axial direction" refers to the direction in which the axis 28 of the stator core 12 extends. Similarly, "circumferential direction" refers to the circumferential direction of the stator core 12. Furthermore, "radial direction" refers to the radial direction of the stator core 12.

[0011] Figure 2 is a partial configuration diagram of the stator 10 as seen from the position of axis 28. Figure 3 is a cross-sectional view taken along line III-III in Figure 2. For example, as shown in Figure 3, the stator core 12 has a yoke 20 and a plurality of teeth 22. The yoke 20 is annular and is located on the outer circumference of the stator core 12. Each tooth 22 extends from the yoke 20 toward the position of axis 28. For example, as shown in Figure 2, the plurality of teeth 22 are arranged at equal intervals along the circumferential direction. A slot 24 is formed between two adjacent teeth 22.

[0012] The coil 14 is formed by a winding wound in one direction. The coil 14 is mounted on the teeth 22 so as to wind around the teeth 22. For example, as shown in Figure 2, the outer shape of the coil 14 as viewed from the position of the axis 28 is approximately rectangular. Part or all of the coil 14 may be wrapped in insulating paper. The coil 14 has a pair of insertion portions 30 and a pair of coil ends 32 (first coil end 32a, second coil end 32b).

[0013] Each insertion portion 30 extends substantially parallel to the axial direction. One insertion portion 30 is inserted into a slot 24 on one side of one tooth 22 from the center side of the stator core 12. The other insertion portion 30 is inserted into a slot 24 on the other side of one tooth 22 from the center side of the stator core 12. In this specification, the direction in which the insertion portion 30 is moved during the insertion process of the insertion portion 30 into the slot 24 (arrow A in Figure 3) is referred to as the insertion direction. The insertion direction is parallel to the radial direction.

[0014] Each of the pair of coil ends 32 is connected to each of the pair of insertion portions 30. The first coil end 32a protrudes axially from the first end face 26a of the stator core 12. The first coil end 32a includes one axial end 34 of the coil 14. The second coil end 32b protrudes axially from the second end face 26b of the stator core 12. The second coil end 32b includes the other axial end 34 of the coil 14. Thus, the pair of coil ends 32 include both ends 34 of the axial coil 14.

[0015] As shown in Figure 3, both ends 34 of the coil 14 have a tapered shape that is inclined with respect to the radial direction. In other words, each end 34 has an inclined shape that approaches the teeth 22 as it moves away from the axis 28 in the radial direction. Note that the entire end 34 does not have to be inclined. At least the inner circumferential surface of the end 34 of the coil 14 (the surface that contacts the fixing member 16) needs to be inclined.

[0016] A pair of gaps 40 are formed between the teeth 22 and the pair of coil ends 32. A fixing member 16 is positioned in each of the pair of gaps 40. The fixing member 16 is inserted into the gap 40 from the center side of the stator core 12.

[0017] Figure 4 is a perspective view of a pair of fixing members 16 of the first embodiment. Each of the pair of fixing members 16 has the same shape as the others. The fixing members 16 are made of, for example, resin, rubber, elastomer, etc. The fixing member 16 has a first contact portion 50 at one end in the axial direction and a second contact portion 52 at the other end in the axial direction. For example, as shown in Figure 3, the first contact portion 50 contacts the end face 26 of the stator core 12 (teeth 22). The first contact portion 50 has a planar shape parallel to the end face 26 of the stator core 12 (teeth 22). The second contact portion 52 contacts the end 34 of the coil 14. The second contact portion 52 has an inclined shape such that it approaches the first contact portion 50 as it moves away from the axis 28 in the radial direction. The inclination angle of the second contact portion 52 is substantially the same as the inclination angle of the end 34 of the coil 14. Because the second contact portion 52 of each fixing member 16 has an inclined shape, the pair of fixing members 16 are inclined along the tapered shape of both ends 34 of the coil 14.

[0018] The pair of fixing members 16 function as wedges to temporarily fix the coil 14 to the stator core 12 before fixing the coil 14 to the stator core 12 with resin. Since both ends 34 of the coil 14 and the pair of fixing members 16 have the same tapered shape, both ends 34 of the coil 14 and the pair of fixing members 16 make line contact or surface contact with each other. This prevents the pair of fixing members 16 from shifting in the axial direction. Also, since both ends 34 of the coil 14 and the pair of fixing members 16 have the same tapered shape, the coil 14 is pressed in the insertion direction by the pair of fixing members 16. This prevents the coil 14 from falling out of the teeth 22. Furthermore, since both ends 34 of the coil 14 and the pair of fixing members 16 have the same tapered shape, the pair of fixing members 16 are easy to insert into the pair of gaps 40. Therefore, the coil 14 can be easily attached and fixed to the stator core 12.

[0019] [2 Second Embodiment] Figure 5 shows a stator 10 of the second embodiment. Figure 6 is a perspective view of a pair of fixing members 16 of the second embodiment. The fixing members 16 have an extension portion 60. The extension portion 60 is formed at the end of the fixing member 16 in the direction opposite to the insertion direction. The size of the extension portion 60 is larger than the size of the gap 40. For example, as shown in Figure 5, the axial length of the extension portion 60 may be longer than the axial length of the gap 40. Also, the circumferential length of the extension portion 60 may be longer than the circumferential length of the gap 40. Furthermore, the extension portion 60 protrudes axially or circumferentially beyond the coil end 32.

[0020] The extended portion 60 can contact the coil end 32. For example, a coil 14 that is not bundled with insulating paper or the like may have its windings unravel. If the windings unravel, some of the windings may fall off the teeth 22. The extended portion 60 prevents the windings from falling off the teeth 22 beyond the fixing member 16.

[0021] [3 Third Embodiment] FIG. 7 is a diagram showing a stator 10 according to a third embodiment. A recess 70 is formed in an axial end surface 26 of a tooth 22. On the other hand, a protrusion 72 is formed on a first contact portion 50 of the fixing member 16. The protrusion 72 may have an inclined shape that is inclined in a direction opposite to the inclined direction of the fixing member 16. The protrusion 72 is inserted into the recess 70. This makes it difficult for the fixing member 16 to come off from the gap 40.

[0022] [4 Other] Each of the embodiments described above is directed to the stator 10 incorporated in an inner rotor type rotating electric machine. However, the present invention can also be applied to a stator incorporated in an outer rotor type rotating electric machine.

[0023] [5 Inventions Obtained from Embodiments] Inventions that can be understood from the above embodiments are described below.

[0024] An aspect of the present invention is a stator (10) including a stator core (12) having a plurality of teeth (22), and a plurality of coils (14) attached to the plurality of teeth so as to wound around each of the plurality of teeth, wherein a pair of coil ends (32) include both end portions (34) of the coils in the axial direction of the stator core, and a pair of fixing members (16) inserted into a gap (40) between the teeth and the pair of coil ends so as to be in contact with the teeth and the both end portions, and fixing the coils to the stator core are provided, the both end portions have a tapered shape inclined with respect to the radial direction of the stator core, and the pair of fixing members are inclined along the tapered shape of the both end portions.

[0025] According to the above aspect, the coils can be easily attached and fixed to the stator core.

[0026] In the above aspect, each of the pair of fixing members may have the same shape as each other.

[0027] According to the above embodiment, the number of types of fixing members can be reduced. Furthermore, with the above configuration, only one type of fixing member needs to be inserted into each gap between the stator core and the pair of coil ends, making the insertion work easier.

[0028] In the above embodiment, an extended portion (60) larger than the size of the gap may be formed at the end of the fixing member in the direction opposite to the insertion direction into the gap.

[0029] According to the above embodiment, it is possible to prevent the coil winding from falling off the teeth beyond the fixing member.

[0030] In the above embodiment, a recess (70) may be formed on the axial end face (26) of the teeth, and a protrusion (72) which is inserted into the recess may be formed on the axial end (50) of the fixing member.

[0031] According to the above embodiment, the fixing member is less likely to come loose from the gap.

[0032] Furthermore, the present invention is not limited to the disclosure described above, and can take various configurations without departing from the spirit of the invention. [Explanation of Symbols]

[0033] 10... Stator 12... Stator core 14... Coil 16... Fixing member 22... Teeth 26... End face 32... Coil end 34... End 40...Gap 50...First contact point (end) 60...Extended portion 70...Recess 72... protruding part

Claims

1. A stator comprising a stator core having multiple teeth, and a plurality of coils mounted on the multiple teeth so as to wind each of the multiple teeth, The pair of coil ends include both ends of the coil in the axial direction of the stator core, The coil is provided with a pair of fixing members that are inserted into the gap between the teeth and a pair of coil ends so as to contact the teeth and both ends, thereby fixing the coil to the stator core. The aforementioned ends are tapered in a shape inclined with respect to the radial direction of the stator core. The gap has a tapered shape such that, as it moves radially away from the axis, the boundary of the gap on the coil end side approaches the teeth. A stator comprising a pair of fixed members, inclined along the tapered shape at both ends.

2. A stator according to claim 1, A stator in which each of the pair of aforementioned fixing members is identical in shape to the others.

3. A stator according to claim 1, A stator in which an extended portion larger than the size of the gap is formed at the end of the fixing member in the direction opposite to the insertion direction into the gap.

4. A stator according to claim 1, A recess is formed on the axial end face of the teeth. A stator having a protrusion formed at the axial end of the fixing member, which is inserted into the recess.

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