JP4002876B2 - stator - Google Patents

Description

The present invention relates to a stator (stator) of a motor, in which an annular yoke laminate and a substantially T-shaped magnetic pole laminate are separately manufactured, and a winding body (for example, a winding is applied to the magnetic pole laminate). In particular, the present invention relates to a split structure type stator assembled with a yoke laminate.

The stator is wound around the magnetic pole in order to improve the motor output, increase the efficiency, or reduce the size while maintaining high efficiency. As a means to perform winding to the magnetic pole easily and with good space factor, the stator core is divided into a yoke part and a magnetic pole part, and the winding is wound around the magnetic pole or a coil winding bobbin is mounted. After that, both are assembled (for example, refer to Patent Document 1).
For example, as shown in FIG. 6, a plurality of (for example, 8) fitting holes are provided on the inner side of the yoke laminate 50 as an assembly connecting means for the conventional yoke laminate (yoke portion) and magnetic pole laminate (magnetic pole portion). 51, and the base side of the shaft portion 52a of the magnetic pole stack 52 is assembled into each of the fitting holes 51, and a semicircular cutout 53 is formed in the shaft portion 52a of the magnetic pole stack 52. A semicircular cutout 54 coinciding with the cutout 53 is formed at a predetermined position of the fitting hole 51, and the shaft portion 52a of the magnetic pole laminate 52 is inserted into the fitting hole 51, and the cutout 53 facing each other is formed. The magnetic pole laminate 52 on which the winding has been applied is fixed to the yoke laminate 50 by press-fitting rivets into the holes formed by combining 54. Reference numeral 56 denotes a coiled bobbin provided with a winding, and 57 denotes a stator.

JP 2000-125518 A (FIGS. 1 to 4)

However, in the conventional assembly connecting means of the yoke laminate 50 and the pole laminate 52, the winding to the pole laminate 52 is easy, but the yoke laminate 50 and the pole laminate 52 are integrally formed. After assembling, there is a problem that it is necessary to press-fit rivets into the holes outside the punching die device, which is troublesome.
Moreover, stress is newly added to the laminated stator assembled at the corner by rivet press fitting, which is not preferable for quality characteristics and shape accuracy of the laminated iron core.
In the present invention, the yoke laminate and the pole laminate are assembled and integrated with good shape accuracy while making the winding to the pole laminate easier by forming the yoke laminate and the pole laminate separately, and the quality characteristics It aims to provide an excellent stator .

The stator according to claim 1, which meets the above object, includes a yoke laminate and a pole laminate obtained by caulking and laminating a plurality of yoke iron core pieces and magnetic pole core pieces formed by punching from a metal plate, and the magnetic pole laminate. A winding body mounted on a portion excluding the base side of the shaft portion of the body, and the magnetic pole in which the winding body is mounted in each fitting hole formed on the radially inner side of the yoke laminate In the stator assembled by inserting the base side of the shaft of the laminate,
Wherein the outer peripheral wall of the shaft portion of the pole laminate-inserting possible small bulge the shaft from the radially inner to the fitting hole of the yoke stack of the magnetic pole laminate, the fitting state is fitted It is formed on the entrance side of the hole .

Thereby, when the base side of the shaft portion of the magnetic pole laminate is inserted into the fitting hole from the radially inner side of the yoke laminate, the minute bulge portion of the magnetic pole laminate is not pressed from the inner wall of the fitting hole for a long time, The fitting can be performed without requiring an overload, and the integrated shape accuracy is excellent.

The stator according to claim 1, wherein a micro bulge portion that can be inserted from the radially inner side into the fitting hole of the yoke laminate is provided on the base side of the shaft portion of the magnetic pole laminate on which the winding body is mounted. Since it forms in the outer peripheral wall of the axial part of a body, when it assembles | inserts and assembles, a micro bulge part competes with a fitting hole, and, thereby, a shaft part is firmly fixed to a fitting hole.
Further, a fitting allowance such as a dent is not required in the fitting hole of the yoke laminated body with respect to the minute bulging portion formed in the shaft part of the magnetic pole laminated body, and the shape accuracy of the fitted and assembled stator is excellent also from this point. Furthermore, since rivets are not used, productivity is increased.

And since the micro bulge part is located in the entrance side of the fitting hole when the base side of the shaft part is inserted into the fitting hole, the base side of the shaft part of the magnetic pole laminated body is placed on the yoke laminated body. When inserting into the fitting hole from the inside in the radial direction of the yoke laminate, it can be easily performed without requiring an overload. Moreover, the wrinkle to the fitting hole by a micro bulge part hardly arises.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
1 is a plan sectional view of the stator according to the first embodiment of the present invention, FIG. 2 is a perspective view of the stator in an assembled state excluding the coiled bobbin, and FIG. 3 is a manufacturing of the stator. FIG. 4 is a partial plan view showing a stator according to a second embodiment of the present invention, and FIGS. 5A to 5C are views of a magnetic pole laminate showing a modification of a micro-bulge. It is a top view.

As shown in FIGS. 1 and 2, the stator 10 according to the first embodiment of the present invention includes an annular yoke laminate 11 and a plurality of fitting holes formed inside the yoke laminate 11. 12, a magnetic pole laminate 13 in which the base side of the shaft portion 14 is fitted, and a coil winding bobbin 15 which is an example of a winding body attached to a portion excluding the base side of the shaft portion 14 of the magnetic pole laminate 13. Have. Hereinafter, these will be described.

As shown in FIG. 3, the yoke laminate 11 and the pole laminate 13 are formed by punching a metal plate member 30, 30a, for example, a magnetic steel plate or a thin steel plate, through a plurality of steps, respectively, and a yoke core piece 16 and a magnetic pole core piece. 17 is formed by caulking and laminating. 1 to 3, reference numerals 18 to 20 denote caulking portions.
In the yoke core 11 formed by caulking and stacking the yoke core pieces 16, a plurality of (8 in this embodiment) fitting holes 12 are equally formed inside. The opposing inner side walls 21 and 22 of the fitting hole 12 are parallel. The magnetic pole core piece 17 and the magnetic pole laminated body 13 formed by laminating the magnetic pole core piece 17 have a pole tooth portion 23 and a shaft portion 14 integrally connected thereto, and are parallel to each other as shown in FIG. The base side of the shaft portion 14 having the outer peripheral walls 24 and 25 is fitted in the fitting hole 12 of the yoke laminate 11 with substantially no gap.

In the stator 10 according to this embodiment, minute bulge portions 28 and 29 that can be radially inserted into the fitting holes 12 of the yoke laminate 11 are inserted into the outer peripheral walls 24 and 25 on the base side of the shaft portion 14. When the base side of the shaft portion 14 is fully inserted into the fitting hole 12, the minute bulge portions 28 and 29 are pressed into the inner side walls 21 and 22 on the inlet side of the fitting hole 12. The shaft portion 14 is prevented from coming out of the fitting hole 12 by abutting. The micro bulge portions 28 and 29 are illustrated in an enlarged manner in FIG. 1 for easy understanding, but the protrusion heights of the micro bulge portions 28 and 29 are axes having a width of about 5 to 10 mm. It is about 3-20 micrometers (preferably 5-10 micrometers) with respect to the part 14. FIG. In this embodiment, the micro bulges 28 and 29 have a semicircular shape in plan view.

Next, a method for manufacturing the yoke core piece 16 and the magnetic pole core piece 17 will be described with reference to FIG.
As shown in the figure, stations A to E and station F each having punches and dies necessary for punching and forming the yoke core piece 16 and the magnetic pole core piece 17 from the strip-shaped metal plate materials (for example, silicon steel plates) 30 and 30a. Use a mold apparatus with ~ H.

In station A, pilot holes 31 are formed on both sides of the metal plate 30 in the width direction, and the metal plate 30 is sequentially intermittently conveyed to the next station B (˜E) at a predetermined pitch. At station B, the caulking portion 32 of the rotor is formed, and the outer shape is removed at station C and caulking is performed. Next, at station D, the caulking portion 20 of the yoke core piece 16 is formed, and at the station E, the outer shape of the yoke core piece 16 having the fitting hole 12 is removed, and these are caulked and laminated to complete the yoke laminate 11.

In the station F, pilot holes 31a are formed on both sides in the width direction of another metal plate 30a, and the metal plate 30a is sequentially intermittently conveyed to the next station G (˜H) at a predetermined pitch.
In the station G, the caulking portions 18 and 19 that connect the magnetic pole core pieces 17 to each other are formed. At the station H, the magnetic pole core piece 17 is extracted and caulked and laminated in a lower die holder to complete the magnetic pole laminate 13. When the magnetic pole core piece 17 is removed from the outer shape, minute bulge portions 28 and 29 are formed on the shaft portions of the respective magnetic pole core pieces 17. Note that the stations F to H may be constituted by another mold apparatus that operates independently of the stations A to E. Further, the caulking portions 18 to 20 may be half-cut caulking in a circular shape or other shapes in plan view, or may be rectangular V-shaped caulking in plan view.
Further, the magnetic pole core pieces are not limited to this embodiment, and may be formed by punching in series, and the form of the formation can be made appropriately.

After forming the magnetic pole laminate 13 through the above steps, the coil winding bobbin 15 to which a predetermined winding is applied in advance is attached to the shaft portion 14, or after the winding is wound, the magnetic pole lamination is performed. The base side of the shaft portion 14 of the body 13 is sequentially pressed and inserted into the fitting hole 12 of the yoke laminate 11 from the radially inner side, and the stator 10 is completed.
In this case, the height of the micro-bulges 28 and 29 is very small, and the distance that competes with the inner walls 21 and 22 of the fitting hole 12 is short, so that excessive stress is applied to the yoke laminate 11 and the pole laminate 13. Will not be deformed. Further, since the shaft portion 14 of the magnetic pole laminate 13 is inserted into the fitting hole 12 of the yoke laminate 11 from the inner side in the radial direction of the yoke laminate 11, each core piece of the magnetic pole laminate 13 and the yoke laminate 11 is guided. And fits relatively easily.

Next, a stator 34 according to a second embodiment of the present invention will be described with reference to FIG. The basic structure of the yoke laminate 35 and the pole laminate 36 and the manufacturing method thereof are the same as those of the stator 10 according to the first embodiment, but the fitting holes formed inside the yoke laminate 35. Triangular micro-bulges 38 and 39 are formed on the inner side of the inner wall 37 (that is, near the bottom). The height of each of the minute bulge portions 38 and 39 is low, for example, about 3 to 20 μm with respect to the shaft portion 40 having a width of 5 mm.

Thus, when the base side of the shaft portion 40 of the magnetic pole laminate 36 is inserted into the fitting hole 37, the shaft smoothly moves until the proximal end of the shaft portion 40 abuts against the minute bulge portions 38 and 39. After the portion 40 is fitted into the fitting hole 37 having substantially the same width dimension and the tip of the shaft portion 40 comes into contact with the micro-bulge portions 38 and 39, some load is applied to the outer peripheral wall of the shaft portion 40. Since the distance is short, the shape of the yoke laminate 35 is not affected.

In each embodiment, the shape of the micro-bulges 28, 29, 38, 39 is a semicircle or a triangle. For example, as shown in FIGS. A chamfered rectangle, a gentle trapezoid, or an arrow-shaped bulge portion 44 to 46 may be used.

More preferably, the temperature of the yoke laminates 11 and 35 is made higher than the temperature of the pole laminates 13 and 36 so that the shaft portions 14 and 40 of the pole laminates 13 and 36 are inserted into the fitting holes 12 and 37. The heating temperature in this case is preferably, for example, that the yoke laminates 11 and 35 are heated to 100 to 200 degrees, but the present invention is applied regardless of whether the temperature is lower or higher than this temperature. . Moreover, the magnetic pole laminated bodies 13 and 36 can also be cooled from normal temperature.

The present invention is not limited to the above-described embodiments (for example, dimensions and number), and the present invention can be applied to modifications within a range that does not change the gist of the present invention. For example, a winding body previously wound around a bobbin may be mounted on the shaft portion, or the shaft portion may be directly wound.

FIG. 3 is a plan sectional view showing integration of a yoke laminate and a pole laminate in the stator according to the first embodiment of the present invention. It is a perspective view of the stator of the assembly state except a coil winding bobbin. It is process drawing which shows the manufacturing method of the same stator. It is a fragmentary top view which shows the stator which concerns on the 2nd Embodiment of this invention. (A)-(C) are top views of the magnetic pole laminated body which shows the modification of a micro bulge part. It is a top view of the stator which concerns on a prior art example.

Explanation of symbols

10: Stator, 11: Yoke laminated body, 12: Fitting hole, 13: Magnetic pole laminated body, 14: Shaft part, 15: Coiled bobbin, 16: York iron core piece, 17: Magnetic pole core piece, 18-20: Caulking portion, 21, 22: inner wall, 23: pole tooth portion, 24, 25: outer peripheral wall, 28, 29: minute bulging portion, 30, 30a: metal plate material, 31, 31a: pilot hole, 32: caulking portion, 34: Stator, 35: Yoke laminate, 36: Magnetic pole laminate, 37: Fitting hole, 38, 39: Minute bulge, 40: Shaft, 44-46: Minute bulge

Claims (1)

A plurality of yoke core pieces and magnetic pole core pieces, which are formed by punching by dividing from a metal plate material, are respectively attached to a yoke laminate and a pole laminate, and a portion excluding the base side of the shaft portion of the pole laminate. And assembly by inserting the base side of the shaft portion of the magnetic pole laminate to which the winding body is attached into each fitting hole formed on the inner side in the radial direction of the yoke laminate. In the stator
Wherein the outer peripheral wall of the shaft portion of the pole laminate-inserting possible small bulge the shaft from the radially inner to the fitting hole of the yoke stack of the magnetic pole laminate, the fitting state is fitted A stator formed on the inlet side of a hole .

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