JP6628706B2 - Motor stator structure - Google Patents

Description

  The present invention relates to a stator structure of a motor having straight teeth, and more particularly to a stator structure of a motor holding a stator coil.

  In some cases, straight teeth are used as teeth (pole teeth) of a motor stator. The straight teeth are formed in a straight line from the base end to the distal end of the tooth, and do not have a shape protruding in the circumferential direction at the distal end of the tooth. When a bobbin (or an insulator) with a coil wound is attached to each of the straight teeth, it is necessary to provide a structure for preventing the bobbin (or the insulator) from falling off. With such a structure, a ridge is formed on the inner peripheral side of the side surface of the bobbin, and the ridge is fitted into and engaged with a groove formed in the tooth, whereby the bobbin can be firmly held on the tooth. An armature structure of a rotating machine has been proposed (for example, see Patent Document 1).

JP-A-2000-14057

  FIG. 7 shows the structure of the armature in Patent Document 1, and FIG. 8 is a perspective view of the bobbin in FIG. In the structure of Patent Document 1, a ridge 35 is formed on the inner peripheral side of the long side surface of the base 25a of the bobbin 25, and the ridge 35 is fitted into and engaged with the groove 33 formed in the teeth 22. , The bobbin 25 is firmly held on the teeth 22. However, in this structure, while the bobbin 25 around which the coil 24 is wound is fitted into the tooth 22 and the bobbin 25 is pushed in until the protruding ridge 35 is fitted into the groove 33 of the tooth 22, the protruding ridge 35 spreads outward. A stress is applied to the coil 24 wound around the bobbin 25. Since the coil 24 is wound around the bobbin 25 with tension, the coil may be damaged by the above-described stress. Further, in order to suppress damage to the coil, it is necessary to provide a gap between the teeth 22 and the bobbin 25. In this case, there is a problem that the bobbin 25 attached to the teeth 22 is loose.

  The present invention has been made in view of the above-described problems, and in a motor stator structure having straight-shaped teeth, a motor stator having an improved structure for preventing damage to a coil with a simple configuration and preventing a bobbin around which the coil is wound from falling off. The purpose is to provide a structure.

The present invention includes a stator core having a plurality of straight teeth, a bobbin mounted on the teeth, and a coil wound on the bobbin, wherein the bobbin has a hollow bobbin and a bobbin. It has a flange portion at one end of the opening and a terminal block at the other end, the flange portion and the terminal block are provided only at both axial ends of the stator core in the winding frame , the width of the terminal block, An opening is smaller than the width of the bobbin and is provided on both sides of the bobbin in the bobbin, and a part of an edge of the opening is elastically deformable and can be engaged with a step formed on the teeth. provided Do protrusions by cutting and raising projecting bent inwardly of the side surface on which the respectively formed on the side surface sides of said spool, elastic varying in a direction away from the teeth of the protruding portion There is a stator structure of a motor is configured to be permitted by the aperture.

In the present invention, before Kigakarigo is the bobbin while attempting overtake from the teeth, it is preferable to have a structure in which the protrusion is caught on the step portion.

  ADVANTAGE OF THE INVENTION According to this invention, in the stator structure of the motor which has a tooth of a straight shape, while suppressing damage to a coil with a simple structure, the stator structure of the motor which aimed at the fall prevention of the bobbin around which the coil was wound is improved. .

It is a perspective view of an embodiment. It is a perspective view of the stator core in FIG. It is a perspective view of the bobbin which wound the coil in FIG. It is a perspective view of the bobbin in FIG. It is a figure (A) showing the state where a bobbin is fitted in a tooth in an embodiment, and a figure (B) showing a state where a bobbin is attached to a tooth. It is a figure of another modification of a bobbin. It is a figure showing the state of the conventional armature. It is a perspective view of the bobbin in FIG.

(Constitution)
FIG. 1 is a perspective view of a stator structure 1 according to an embodiment using the present invention. 2 is a perspective view of the stator core in FIG. 1, FIG. 3 is a perspective view of a bobbin around which the coil in FIG. 1 is wound, and FIG. 4 is a perspective view of the bobbin in FIG. FIG. 5 is a diagram (A) showing a process of attaching the bobbin 3 around which the coil 5 is wound to the tooth 2b, and a diagram (B) showing a state where the bobbin 3 is attached to the tooth 2b.

  The stator structure 1 includes an annular stator core 2. The stator core 2 includes three teeth 2b extending in the direction of the axis center. The teeth 2b have a straight shape, and a bobbin 3 on which a coil 5 is wound in advance is mounted on each tooth 2b. Inside the stator structure 1, a rotor (not shown) having a rotor magnet is rotatably arranged.

  The annular stator core 2 is formed by laminating a predetermined number of annular cores made of a thin-plate soft magnetic material (for example, a silicon steel plate) in the axial direction. As shown in FIG. 2, the stator core 2 includes a plurality of teeth 2 b (three teeth 2 b in the drawing, extending from the annular portion 2 a radially inward (in the direction of the axis center), but is not limited to this). ). Concave portions 2c and 2d are formed on the side surfaces of the teeth 2b so that the width of the teeth 2b is reduced except for the tip of the teeth 2b.

  The bobbin 3 is formed by injection molding with an insulating resin. As shown in FIG. 4, the hollow bobbin 3a has flanges 3c and 3d at one end of an opening 3b and at the other end of the opening 3b. Terminal blocks 3e and 3f are provided. Terminal pins 4 (4a, 4b) are implanted in one terminal block 3e. The flange portions 3c and 3d and the terminal blocks 3e and 3f are both provided at both ends in the axial direction (vertical direction), and are not provided on the side surfaces.

  As shown in FIG. 3, a coil 5 is wound around a hollow winding frame 3a (see FIG. 4) with a predetermined number of turns. The winding start and end of the coil 5 are terminal pins 4 (4a, 4b). And are electrically connected (not shown). Elongated concave portions 3g and 3h (see FIGS. 4 and 5) extending in the axial direction are formed on the outer sides of both sides of the winding frame 3a, and are formed on the inner peripheral surface opposite to the concave portions 3g and 3h. Is provided with protrusions 3i and 3j. The projections 3i and 3j can be elastically deformed. When pressed from the inside, the depressions 3g and 3h are eliminated so that the depressions 3g and 3h are eliminated. Elastic deformation occurs in which the depression becomes shallow.

  The protrusions 3i and 3j function as snap fit, and engage with step portions 31 and 32 (see FIGS. 2 and 5) formed on the side surface of the tooth 2b at the boundary between the tip of the tooth 2b and the recesses 2c and 2d. I do. That is, as shown in FIG. 5 (B), the protrusion 3i elastically contacts and is caught by the step on the radially outer side of the step portion 31, and the protrusion 3j is formed on the step on the radially outer side of the step 32. Elastic contact and catch. With this structure, the bobbin 3 does not come off the teeth 2b.

(Attaching bobbins to teeth)
With reference to FIG. 5, a state where the bobbin 3 on which the coil 5 is wound in advance is mounted on the tooth 2b will be described. First, the tips of the teeth 2b are fitted into the openings 3b from the side of the terminal blocks 3e and 3f (see FIG. 4) of the bobbin 3 (FIG. 5A). Next, the bobbin 3 is further pushed in, and the teeth 2b are fitted into the openings 3b. At this time, the protrusions 3i and 3j provided on the inner peripheral surface of the side surface of the bobbin 3a of the bobbin 3 are deformed so as to spread outward, and the deformation causes the recesses 3g and 3h to expand and deform.

  Further, when the bobbin 3 is pushed into the teeth 2b, the protrusion 3i is hooked and fitted to the step portion 31 and the protrusion 3j is hooked and fitted to the step portion 32. Due to this hooking, a structure for preventing the bobbin 3 from coming off from the teeth 2b is obtained. This state is shown in FIG.

(Superiority)
As described above, the stator structure 1 of the motor includes the stator core 2 having the plurality of straight teeth 2b, the bobbin 3 mounted on the teeth 2b, and the coil 5 wound around the bobbin 3. The protrusions 3i, 3j which are elastically deformable and engage with the teeth 2b are provided on the side of the teeth 2b of the third 3, and the bobbin 3 allows the protrusions 3i, 3j to elastically deform in a direction away from the teeth 2b. Recesses 3g and 3h are provided. In this structure, the teeth 2b are provided with step portions 31 and 32 that engage with the protrusions 3i and 3j. The engagement between the protrusions 3i and 3j and the step portions 31 and 32 removes the bobbin 3 from the tooth 2b. In this case, the protruding portions 3i and 3j are configured to be hooked on the step portions 31 and 32.

  According to this structure, in the process of transitioning from FIG. 5 (A) to FIG. 5 (B), the protruding portions 3i, 3j are pressed by the teeth 2b and deform to spread outward. At this time, the outward deformation of the protrusions 3i, 3j is absorbed by the recesses 3g, 3h, and the bobbin 3 does not expand in the direction of the coil 5. For this reason, strong stress is not applied to the coil 5. Also, since the flange portions 3c and 3d and the terminal blocks 3e and 3f are formed in a straight line orthogonal to the bobbin 3 for the bobbin 3, the coil 5 is aligned when the coil 5 is wound around the bobbin 3a. Winding becomes easy. As a result, the space factor of the coil can be increased.

(Modification)
FIG. 6 is a diagram showing another bobbin structure, in which cut-and-raised portions 43 and 44 projecting inward are provided in openings 41 and 42 provided on both sides of the bobbin 40 on the side surface of the bobbin 40a. The bobbins 40 can be mounted on the teeth 2b by engaging the cut-and-raised portions 43 and 44 with the steps 31 and 32 (see FIG. 5) of the teeth 2b. In this case, when the bobbins 40 are attached to the teeth 2b and the cut-and-raised portions 43 and 44 are pushed outward by the teeth 2b and deformed, the cut-and-raised portions 43 and 44 do not protrude outside the bobbin 40. Strong stress is not applied to the coil wound around the bobbin 40.

<Others>
1. Even when the recesses 2c and 2d of the teeth 2b are grooves, the same effect can be obtained.
2. The projections 3i and 3j provided on the inner peripheral surface of the side surface of the bobbin 3a of the bobbin 3 are formed over the entire length of the side surface.
3. Although the flange 3c and 3d are provided at one end of the opening 3b of the winding frame 3a, a flange may be formed at the other end where the terminal block is formed. In that case, direct contact between the coil 5 and the stator core 2 can be prevented.
4. Although the flange portions 3c and 3d are formed only in the vertical direction of the winding frame 3a, if it is possible to increase the width of the slot formed between the adjacent teeth 2, the flange portions 3c and 3d may be formed. 3d may be formed on the entire circumference (vertical direction and side surface) of the winding frame 3a.
5. FIG. 1 shows an example of an inner rotor type motor, but the present invention can also be applied to a stator of an outer rotor type motor.

  DESCRIPTION OF SYMBOLS 1 ... Stator structure, 2 ... Stator core, 2a ... Annular part, 2b ... Teeth, 2c, 2d ... Depression, 3 ... Bobbin, 3a ... Hollow winding frame, 3b ... Opening, 3c, 3d ... Flange part, 3e, 3f ... Terminal blocks, 3g, 3f recesses, 3i, 3j projecting portions, 31, 32 step portions.

Claims (2)

A stator core having a plurality of straight teeth,
A bobbin attached to the teeth,
And a coil wound around the bobbin,
The bobbin includes a hollow bobbin, a flange portion at one end of an opening of the bobbin, and a terminal block at the other end, and the flange portion and the terminal block are both axial ends of the stator core in the bobbin. Only in the
The width of the terminal block is smaller than the width of the bobbin,
An opening is provided on the side surface sides of said spool in said bobbin, a part of the edge of the opening, the stepped portion formed on the teeth elastically deformable and engageable with the projecting portion of the winding frame It is provided by a cut and raised that bends and protrudes inside the side surface respectively formed on both sides of the side surface ,
The stator structure of the motor, wherein the opening allows the elastic deformation of the protrusion in a direction away from the teeth. The engagement, the bobbin while attempting overtake from the teeth, the stator structure of the motor according to claim 1 having a structure in which the protrusion is caught on the step portion.

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