JP4875662B2 - Rotating electric machine stator - Google Patents

Description

  The present invention has a stator provided with a yoke arranged annularly around a central axis and teeth projecting radially outward from the yoke, and a winding bobbin made of an insulator is arranged around the teeth. The present invention relates to a stator of a rotating electrical machine having a coil wound around the winding bobbin, and particularly relates to the structure of the winding bobbin.

Japanese Patent Application Laid-Open No. 2002-284446, Japanese Patent Application Laid-Open No. 2006-67778, and Japanese Patent Application Laid-Open No. 2007-267492 disclose conventional devices related to a winding bobbin of a rotating electrical machine.
In any of the publications described in the above-mentioned publications, a locking rib for positioning the coil is disposed on the winding bobbin for the purpose of preventing coil winding disturbance. The shape and interval of the locking ribs are arranged according to the wire diameter of the coil.

JP 2002-284446 (3rd page, FIG. 9) JP 2006-67778 A (page 14, FIG. 4) JP 2007-267492 (6th page, FIG. 1)

In the structure of the winding bobbin configured as described above, it is necessary to manufacture a winding bobbin for each coil wire diameter because one type of winding bobbin cannot cope with a plurality of coil wire diameters. Increased mold costs and deteriorated productivity were problems, such as the need to replace the winding bobbin when winding products with different diameters.
Further, due to dimensional tolerance variations of the winding bobbin and the coil, it is difficult to securely lock the coil at an arbitrary position on the winding bobbin, which causes a problem of winding disturbance.

  In this invention, it was made in order to solve the above problems, and it is possible to wind a plurality of coil wire diameters with one type of winding bobbin and to securely lock the position of the coil. An object of the present invention is to provide a winding bobbin shape in which no winding disturbance occurs.

A stator of a rotating electrical machine according to the present invention includes a yoke that is annularly disposed around a central axis, and a stator that includes teeth that protrude from the yoke toward the central axis in the radial direction, and is insulated around the teeth. In a stator of a rotating electrical machine having a winding bobbin composed of a body and having a coil wound around the winding bobbin, the winding bobbin is crushed by the winding tension of the coil to lock the winding A protrusion is provided , and the protrusion is a rib having a continuous shape, and the rib is disposed in a direction orthogonal to the winding direction of the coil .

According to the present invention, the continuous ribs that are crushed by the coil winding tension to lock the winding are disposed in a direction orthogonal to the coil winding direction, so that the coil winding can be securely locked. because, it is possible to prevent uneven winding, together with improved product quality can be achieved, in one winding bobbin, be a winding allows a plurality of coil wire diameter, possible to reduce the mold costs and it is, moreover, it is possible to improve the productivity due to unnecessary winding bobbin replacement at different coil wire diameter production.

Embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a sectional view of an embodiment of a brushless motor to which the present invention is applied, FIG. 2 is a winding state diagram, and FIG. 3 is a diagram showing the shape of a winding bobbin.
In FIG. 1, the brushless motor 1 includes a stator 5 and a rotor 6. The frame 2 has a bottomed cylindrical shape, and a stator 5 having a winding bobbin 3 and a coil 4 wound around the winding bobbin 3 disposed on the inner periphery of the frame 2 is fixed by press-fitting or the like. The rotor 6 is disposed through a predetermined gap with the inner peripheral surface.
The rotor 6 has a magnet 8 fixed to the shaft 7 by adhesion or the like, and is held by a bearing 9 held by a bearing case portion 2 a provided on the frame 2 and a bearing case portion 10 a provided by the housing 10. The bearing 11 is rotatably supported.

2A and 2B are winding state diagrams, in which FIG. 2A is a view of the winding as viewed from the lateral direction, and FIG. 2B is a cross-sectional view taken along line AA of FIG.
A winding bobbin 3 made of an insulator is disposed around the teeth 12 projecting from the yoke of the stator 5 toward the radial center axis, and the coil 4 is wound around the winding bobbin 3 at a predetermined position. .

3A and 3B are diagrams showing the winding bobbin 3 according to the first embodiment, in which FIG. 3A is a view seen from the lateral direction, and FIG. 3B is a cross-sectional view taken along line AA in FIG. FIG. 3C shows a view from above. The winding bobbin 3 includes a rib 13 which is a protrusion having a continuous shape that is integrally formed on the entire contact portion of the inner periphery of the coil in a direction orthogonal to the winding direction of the coil 4.
The rib 13 is softly formed so as to be crushed by the winding tension.

  Since the first embodiment is configured as described above, when the coil 4 is wound around the winding bobbin 3, the rib 13 is deformed so as to follow the shape of the coil 4 due to the winding tension of the coil 4. . This state is shown in FIG. Since the rib 13 is formed so as to be crushed by the winding tension, the first layer of the coil is deformed so as to be close to the outer shape of the coil wire, and becomes a rib 13a. For this reason, the coil 4 of the 1st layer is reliably latched in arbitrary positions with the shape of the deformed rib 13a. Since the first layer is reliably locked, it is possible to stably wind the second layer and the subsequent layers, preventing winding disturbance and improving the quality.

  As another effect, since the rib 13 can be freely deformed, even when the wire diameter of the coil 4 is different, the turbulence can be prevented by the same effect as described above. In the case of forming a locking portion matching the wire diameter as in the past, when winding with different coil wire diameters, it was necessary to set a winding bobbin that matched the wire diameter each time However, in the first embodiment, it is possible to cope with a plurality of coil wire diameters with one type of winding bobbin. This eliminates the need to replace the winding bobbin at the time of production with different coil wire diameters, and can bring about the effects of reducing the mold cost and improving the productivity.

Embodiment 2. FIG.
5A and 5B are diagrams showing the winding bobbin 3 according to the second embodiment, in which FIG. 5A is a diagram seen from the lateral direction, FIG. 5B is a cross-sectional view taken along line AA in FIG. FIG. 5C shows a view from above. In the second embodiment, the rib 13 is provided at a part of the contact portion on the inner periphery of the coil.
In the first embodiment, the rib 13 is disposed on the entire contact portion on the inner circumference of the coil. However, as in the second embodiment, the rib 13 is provided on a part of the contact portion on the inner circumference of the coil. It is possible to obtain substantially the same effect as the first embodiment.

Embodiment 3 FIG.
6A and 6B are diagrams showing the winding bobbin 3 according to the third embodiment, where FIG. 6A is a view seen from the lateral direction, FIG. 6B is a cross-sectional view taken along line AA in FIG. FIG. 6C shows a view from above. In the third embodiment, the rib 14 is formed in a direction parallel to the winding direction.
When it is difficult to form a rib perpendicular to the winding direction of the coil 4 as shown in the first embodiment due to the mold configuration of the winding bobbin 3, the rib is arranged in a direction parallel to the winding direction. However, substantially the same effect as described above can be obtained.

When the ribs are formed in the direction parallel to the winding direction as described above, the pitch of the ribs is desirably ¼ or less of the coil winding diameter in order to stabilize the winding position. FIG. 6 is a diagram for explaining the concept of Embodiment 3 of the present invention, and the relationship with the coil winding diameter in FIG. 2 is not necessarily an optimal description.
Further, FIG. 6 shows a view in which the ribs 14 are arranged in the direction parallel to the winding direction of the coil 4 and in the entire contact portion of the inner periphery of the coil. Almost the same effect can be obtained even if it is partially arranged.
Furthermore, the direction of the rib 14 is not limited to being orthogonal or parallel to the winding direction of the coil 4, but substantially the same effect can be obtained even if it is disposed in an oblique direction.

Embodiment 4 FIG.
7A and 7B are views showing the form of the winding bobbin 3 according to the fourth embodiment. FIG. 7A is a view seen from the lateral direction, and FIG. 7B is a cross-sectional view taken along line AA in FIG. FIG. 7 and FIG. 7C show a view from above. In the fourth embodiment, instead of the rib 13, a substantially conical projection 15 is disposed on almost the entire contact portion on the inner periphery of the coil. The substantially conical protrusions 15 are formed so as to be easily deformed and crushed by the tension of the winding.
When it is necessary to keep the winding tension low for reasons such as protection of coil scratches during winding, it is difficult to obtain the effect of crushing the ribs of the winding bobbin 3, but the rib is not a continuous belt. By using a substantially conical protrusion as in the fourth embodiment, the protrusion 15 can be crushed with a low winding tension, and the same effect as in the first embodiment can be obtained.

When the substantially conical protrusion 15 is formed in this way, it is desirable that the pitch of the protrusion is ¼ or less of the coil winding diameter in order to stabilize the winding position. FIG. 7 is a diagram for explaining the concept of Embodiment 4 of the present invention, and the relationship with the coil winding diameter in FIG. 2 is not necessarily an optimal description.
Further, FIG. 7 shows a diagram in which the substantially conical protrusions 15 are arranged on the entire contact portion on the inner circumference of the coil. However, the projection is not limited to the entire contact portion on the inner circumference of the coil. However, almost the same effect can be obtained.

Although the structure has been described in the first to fourth embodiments, the following materials are suitable for the material of the winding bobbin 3.
The winding bobbin of the present invention is used for a rotating electrical machine, and therefore has good insulation and heat resistance, and has a high toughness material capable of crushing ribs by winding tension. Polypropylene, polyamide, polyester, Polybutylene terephthalate is suitable.

It is sectional drawing of one Example of the brushless motor to which this invention is applied. FIG. 2A is a diagram illustrating a winding state, FIG. 2A is a diagram viewed from the lateral direction, and FIG. 2B is a cross-sectional view taken along line AA in FIG. FIGS. 3A and 3B are views showing the winding bobbin according to the first embodiment of the present invention, FIG. 3A is a view seen from the lateral direction, FIG. 3B is a cross-sectional view taken along the line A-A in FIG. c) is a view from above. It is a figure explaining the state where the rib was crushed by winding tension. 5A and 5B are views showing a winding bobbin according to Embodiment 2 of the present invention, in which FIG. 5A is a view seen from the lateral direction, FIG. 5B is a cross-sectional view taken along line AA in FIG. c) is a view from above. 6A and 6B are views showing a winding bobbin according to Embodiment 3 of the present invention, in which FIG. 6A is a side view, FIG. 6B is a cross-sectional view taken along line AA in FIG. c) is a view from above. 7A and 7B are views showing a winding bobbin according to Embodiment 4 of the present invention, in which FIG. 7A is a side view, FIG. 7B is an AA cross-sectional view of FIG. c) is a view from above.

Explanation of symbols

  1 brushless motor, 2 frame, 2a bearing case, 3 winding bobbin, 4 coil, 5 stator, 6 rotor, 7 shaft, 8 magnet, 9 bearing, 10 housing, 10a bearing case, 11 bearing, 12 teeth, 13 Ribs, 13a Deformed ribs, 14 Ribs, 15 Conical protrusions.

Claims (4)

A stator having a yoke annularly arranged around the central axis and teeth projecting from the yoke toward the radial central axis, and a winding bobbin made of an insulator is disposed around the teeth; In a stator of a rotating electrical machine having a coil wound around the winding bobbin, the winding bobbin includes a protrusion that is crushed by a coil tension of the coil to lock the winding , and the protrusion is continuous. A stator for a rotating electrical machine , wherein the rib is shaped and disposed in a direction orthogonal to a coil winding direction .   The stator of the rotating electrical machine according to claim 1, wherein the protrusion is provided on the entire contact portion of the inner periphery of the coil.   The stator of a rotating electrical machine according to claim 1, wherein the protrusion is provided at a part of a contact portion on the inner periphery of the coil.   The stator of a rotating electrical machine according to claim 1, wherein the winding bobbin is made of a resin material of any one of polypropylene, polyamide, polyester, and polybutylene terephthalate.

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