JP3423351B2 - Manufacturing method and manufacturing apparatus for wound stator core - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding stator core manufacturing method and manufacturing apparatus, and more particularly to a winding stator core manufacturing method and manufacturing apparatus having excellent electric characteristics.

[0002]

2. Description of the Related Art As a stator core for a rotating electric machine such as an electric motor or a generator, a laminated type stator core in which a large number of thin plate materials punched into a predetermined shape are laminated and a thin plate and a long strip material are used. There is a winding type stator core that is wound in a spiral. Winding type stator cores include those disclosed in Japanese Examined Patent Publication No. 38-18403 and Japanese Examined Patent Publication No. 59-36503.

FIG. 8 shows a strip member 10 used for a conventional winding type stator core (winding type stator core). The strip member 10 has a large number of comb-teeth-shaped slots 12 formed at a pitch P on the inside, and caulking projections 14 formed on the outside at a pitch P. The pitch P is
In consideration of the diameter of the stator core to be manufactured, the upper and lower slots 12 and the caulking projections 14 are designed to vertically overlap with each other.

FIG. 9 shows a conventional wound stator core 16 manufactured by using the strip material 10 having the above-mentioned structure. This winding-shaped stator core 16 is made by the applicant of the present invention, including Japanese Patent Application No. 3-358433, 3-358644.
And the manufacturing apparatuses described in Japanese Patent Application Nos. 4-46160 to 4-46162. As shown in the figure, inside the stator core 16, a slot groove 18 is formed vertically corresponding to the slot 12.

[0005]

According to the conventional wound stator core 16 described above, there is a limit in preventing the pulsation of rotation and improving the characteristics such as smooth rotation operation. Therefore, the slot grooves are shifted by a small angle with respect to the central axis so as to have an inclination with respect to the central axis (give skew).
It is possible. Such a design change is not so difficult in the above laminated stator core. That is, it is achieved by shifting each thin plate by a small angle and stacking them.

On the other hand, in a wound stator core manufactured by a continuous winding method, in order to make the slot grooves have an inclination (give a skew), for example, the strip material is cut every winding, and each time, the strip material is cut. It is conceivable to rotate the lower die of the mold.

However, in order to realize skewing by the above method, not only the device itself but also the control mechanism becomes complicated. Further, since the winding work is intermittent, there is a fatal problem that work efficiency is reduced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simple structure, but it is possible to impart a skew to a winding stator core without lowering work efficiency. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus of.

[0009]

A first aspect of the present invention relates to a winding type stator core for manufacturing a cylindrical winding type stator core by spirally winding a long strip material. In the manufacturing method, the step of forming comb-teeth-shaped slots inside the strip material at a constant pitch is included, and the inner periphery of the winding stator core is formed by the slots of the strip material spirally stacked. The pitch of the slots is compared with the pitch used for the vertical stack in which the slot grooves finally extend vertically so that the vertical slot grooves formed in the final stage have a predetermined inclination (skew). It is set with a difference.

A second invention according to the present application is a winding stator core manufacturing apparatus for manufacturing a cylindrical winding stator core by spirally winding a number of long strips of material. A comb-shaped slot on the inside of the strip material, one press forming device for forming the caulking protrusions at the same pitch, and a roll forming device for spirally winding and stacking the press-formed strip material. In the press working apparatus, the pitch is such that a longitudinal slot groove formed on the inner circumference of the winding stator core by the slot finally causes a predetermined deviation (skew),
The slot grooves are formed with a difference of a predetermined amount compared to the pitch used for vertically extending vertically stacked layers, and when the caulking projection is composed of a convex portion and a concave portion, and when they are vertically overlapped,
The concave portion is formed to be larger than the convex portion so that the positional shift due to the pitch shift amount can be absorbed.

[0011]

In the present invention, the pitch of the slots of the strip material is shifted by a slight amount as described above, so that the slot groove on the inner circumference of the finally formed winding stator core is inclined (skew is imparted). Therefore, the winding stator core with skew can be manufactured by the same manufacturing apparatus as the conventional one.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows the structure of a strip material 20 for a wound stator core according to this embodiment. A large number of comb-teeth shaped slots 22 are formed inside the strip material 20, and caulking projections 24 are formed on the outer edge portion. The pitches of the slots 22 and the caulking projections 24 are both P1, which is set to be larger or smaller than P of the conventional wound stator core 16 by a minute amount ΔP corresponding to the skew. Such a change amount ΔP is a skew amount required for the entire stator core,
It is designed in consideration of the number of slots and the number of layers.

FIG. 2 shows a wound stator core 26 of the present embodiment manufactured by the same manufacturing apparatus as the conventional stator core, using the strip member 20 having the above-mentioned structure. Inside the winding stator core 26, a slot groove 28 is formed which is displaced from the central axis by a predetermined amount.

As shown in FIGS. 3 and 4, the caulking projection 24 comprises a convex portion 24A and a concave portion 24B,
The concave portion 24B is formed with a margin with respect to the convex portion 24A so as to absorb the shift amount (skew amount) for one roll of the strip material 20. When the strip materials 20 formed in this way are overlapped, the result is as shown in FIG.

The pitch of the caulking projections 24 is not the same as the pitch P1 of the slots 22, but is an integral multiple of P1 (n
It may be set to P1). It is also possible to set the pitch to be the same as the pitch P in the case of the conventional vertical stacking. In this case, the shape of the caulking projection does not require the relief portion as in the above 24, and the convex portion and the concave portion can be formed to have substantially the same size as in the conventional case.

FIG. 6 shows the structure of a system for manufacturing the above wound stator core. This system has the same basic configuration as the conventional winding stator core 16 is manufactured, and includes a drum 102 around which a long material is wound,
A material guide 104 that guides the material delivered from the drum 102, an uncoiler 106 that corrects warp and the like of the material delivered from the material guide 104 to make it flat, two punching press devices 108 and 110, and a strip material. Two
And a winding forming device 112 (see FIG. 7) that winds 0 to form the wound stator core 26.

In the winding stator core 26 shown in FIGS. 1 and 2, the pitches of the slots 22 and the caulking projections 24 are the same (P1). Therefore, when the winding stator core 26 is manufactured, Need only operate one of the two punching presses 108, 110. Also, the pitch of the caulking projections is an integer multiple of the pitch P1 of the slots 22 (nP1)
The same applies to the case. On the other hand, when the caulking projections are formed at a pitch different from that of the slots 22, for example, at the same pitch P as the conventional one, the pressing devices 108 and 110 are used.
Are used for forming slots and forming projections for crimping.

FIG. 7 shows the construction of the roll forming apparatus 112. Since the roll forming device 112 has a configuration in which devices having the same structure are arranged in parallel, only one of them will be described here. The roll forming device 112 includes a rotating main shaft 122 arranged in the center and a set of bevel gears 124A and 124B for transmitting power to the rotating main shaft 122.
An inner diameter guide tube 126 which is connected (fixed) to the tip of the rotary spindle and around which the strip material 20 is wound, a molding plate 128 and a squeeze ring 130 which regulate the outer circumference of the strip material 20, a squeeze ring 130 and an inner diameter A cylinder head portion 132 and a pressure pad 134 for applying pressure from below to the laminated strips arranged between the guide cylinders 126, a guide plate 136 fixed to the rotating main shaft 122 and rotating integrally, and a guide plate 136. It is composed of a drive pin 138 that is disposed inside and pulls the strip material 20, and a cam mechanism 140 that is fixedly installed above the guide plate 136 and that slides the drive pin 138 up and down.

The inner diameter guide tube 126 is composed of a frustoconical introduction portion 126A formed in the upper portion and a uniform outer diameter formation portion 126B formed under the introduction portion 126A, and the strip member 20 is introduced in the introduction portion. It is adapted to be rolled and dropped from 126A to the forming portion 126B. Cylinder head part 1
32 is attached to the tip of the piston rod of the fluid pressure cylinder.

Next, the manufacturing process of the wound stator core 26 using the manufacturing system configured as described above will be briefly described. Material guide 104 supplied from drum 102
And the stripping material that has passed through the uncoiler 106 is
The strip material 20 is molded by press molding by the pressing device 108 or 108 and 110.

The strip material 20 is formed by the roll forming machine 112.
Is wound around and stacked in a spiral shape by the roll forming device 112, and at the same time, caulking is performed to manufacture the wound stator core 26. In addition, in the above embodiment, the strip material 20 which is spirally laminated is fixed by caulking, but the present invention is not limited to such a processing method, and the caulking projection is not used, laser welding or the like. The strip members may be fixed to each other by.

[0022]

As described above, in the present invention, the slot pitch of the strip material is shifted by a minute amount so that the slot groove on the inner periphery of the finally formed wound stator core is inclined. Since (skew is added), the device with the same relatively simple structure as the conventional one
There is a special effect that the skewed winding stator core can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a strip material according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a structure of a wound stator core of the present invention formed by using the strip material shown in FIG.

FIG. 3 is an enlarged plan view showing a main part of the strip material shown in FIG.

FIG. 4 is a cross-sectional view showing a cross section in the YY direction of FIG.

5 is a cross-sectional view showing a laminated state of strip materials having the configuration shown in FIG.

FIG. 6 is a perspective view showing a manufacturing system configuration of the wound stator core of the present embodiment shown in FIG.

7 is a main part of the system shown in FIG. 6 (roll forming device).
It is a figure (partial cross section) which shows the structure of.

FIG. 8 is a plan view showing a configuration of a strip material used for a conventional wound stator core.

9 is a perspective view showing a configuration of a conventional wound stator core formed by using the strip material shown in FIG.

[Explanation of symbols]

20 strip material 22 slots 24 Protrusion for caulking 24A convex 24B recess 26 winding type stator core 28 slot groove (skew type) 108,110 Press machine 112 Roll forming machine

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2-106151 (JP, A) JP-A-2-23048 (JP, A) JP-A 59-63941 (JP, A) JP-A 52- 49967 (JP, A) JP 61-92137 (JP, A) Special table 62-500559 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 15/02 H02K 1 / 18

Claims (5)

(57) [Claims] 1. A method for manufacturing a wound stator core, comprising manufacturing a cylindrical wound stator core by winding a plurality of long strips in a spiral shape and laminating the strip material inside the strip material. A longitudinal slot groove formed in the inner circumference of the wound stator core by the slots of the strip material spirally stacked is included, including the step of forming comb-shaped slots at a constant pitch, The pitch of the slots of the strip material is set with a predetermined amount of difference from the pitch used for vertical stacking in which the slot grooves finally extend vertically so that a predetermined inclination (skew) is finally generated. A method for manufacturing a wound stator core, comprising: 2. The manufacturing method includes a step of forming caulking protrusions on the strip material at a pitch that is an integral multiple of the pitch of the slots, and the caulking protrusions include a convex portion and a concave portion, and 2. The method for manufacturing a wound stator core according to claim 1, wherein the recesses are formed to be larger than the protrusions so as to be able to absorb the positional deviation due to the deviation amount of the pitch when they overlap each other. 3. The method for manufacturing a wound stator core according to claim 1, wherein the manufacturing method includes a step of forming caulking projections on the strip material at the pitch of the vertical stacking. 4. A winding stator core manufacturing apparatus for manufacturing a cylindrical winding stator core by winding and laminating a plurality of long strips in a spiral shape, wherein A press-forming device for forming the comb-teeth-shaped slots, the caulking projections at the same pitch, and a roll-forming device for spirally winding and stacking the pressed strip material, In the processing apparatus, the pitch is such that the longitudinal slot groove formed on the inner circumference of the winding stator core by the slot finally has a predetermined inclination (skew).
So that the slot grooves are formed with a difference of a predetermined amount from the pitch used for the vertical stack that finally extends vertically, and the caulking protrusion is composed of a convex portion and a concave portion, which are vertically overlapped. The winding stator core manufacturing apparatus, wherein the concave portion is formed larger than the convex portion so that the positional deviation due to the deviation amount of the pitch can be absorbed. 5. A winding stator core manufacturing apparatus for manufacturing a cylindrical winding stator core by winding and laminating a plurality of long strip materials in a spiral shape, wherein the strip material is fixed. And a second press forming device for forming the caulking projections at a pitch of 2, and a second comb-shaped slot formed inside the strip material at a constant pitch different from the pitch of the caulking projections.
And a roll forming device that spirally winds and stacks the strip material formed by the first and second press forming devices, wherein the first press forming device comprises: The pitch of the protrusions is the same as the pitch used for vertical stacking in which the longitudinal slot grooves formed in the inner circumference of the wound stator core by the slots extend vertically, and in the second press working apparatus, The pitch of the slots has a predetermined difference from the pitch used for the vertical lamination so that the slot grooves finally have a predetermined inclination (skew). Manufacturing equipment.