JPH10322980A - Method of molding laminate for stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a laminate for a stator at low material cost by a roll-winding method. SOLUTION: When forming heteromorphic ribbons 11 and 11' by striking a band board 10 into the shape of comb teeth, a width W of teeth 12 and 12' and a length S of bridge parts 13 and 13' which couple the teeth are set in the same dimensions, and two pieces of heteromorphic ribbons 2 are taken out, and before rolling these heteromorphic ribbons 11 and 11', the bridge parts 13 and 13' are thinned and bent so as to shrink the length of that bridge part into target length, and the heteromorphic ribbons 11 and 11' are rolled so that the bridge parts 13 and 13' become the inside, letting the teeth 12 and 12' develop radially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a laminated plate for a stator of a motor, a generator or the like, and more particularly, to an inner laminated plate (inner) of a stator core configured as a laminated type and an inner / outer split type. (A laminated plate).

[0002]

2. Description of the Related Art As shown in FIG. 7, a stator core of this type has an outer core 2 on which a ring-shaped outer laminated plate 1 is laminated, and a narrow bridge 4 between the roots of radially arranged teeth 3.
And an inner core 6 formed by laminating the inner laminated plates 5 connected by the above-mentioned structure. The coil 7 is wound around the laminated portion of the teeth 3 of the inner laminated plate 5 forming the inner core 6. According to such a laminated and split type stator core, after the coil 7 is directly wound around the teeth of the inner core 6 or after the coil 7 previously wound around the bobbin is fitted into the teeth 3, the inner core 6 Is fixed to the outer core 2 to complete the stator, so that the workability of coil winding is significantly improved.

Conventionally, the inner laminated plate 5 is generally formed by stamping a plate material into a final shape. However, the inner laminated plate 5 has grooves (G) corresponding to the number of teeth between the teeth 3. Since there is a relatively large hole 5b for inserting the rotor at the center in addition to the existence of the tooth groove 5a, a large amount of scrap is generated by the punching, and there is a problem that the burden of material cost is large. .

Accordingly, recently, as shown in FIG.
Is formed in a one-way F
While being sent to the inner laminated plate 5 by using appropriate jigs and rolls so that the bridge portion 13 between the tooth portions 12 is on the inner side, the respective tooth portions 12 are developed radially. Molding methods have been put to practical use. According to this molding method, the punching of the hole 5b (FIG. 7) for inserting the rotor described above becomes unnecessary, so that the amount of scrap generated by the punching is reduced, and the material cost is reduced.

[0005]

By the way, in the forming method using the above-mentioned roll winding, a somewhat wide strip 1 is used.
If 0 is prepared and two deformed ribbons 7 are taken in an inverted state, no scrap is generated, which is extremely advantageous in terms of material costs. However, the teeth 12 of the deformed ribbon 11
Is set in accordance with the width of the teeth 3 of the final shape (the inner laminated plate 5) and the width of the bottom (groove bottom) of the tooth groove 5a, respectively. L does not have the same dimensions in design (usually W> L), and the two-cavity has to be abandoned.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and an object thereof is to provide a method of forming a laminated plate that enables two-piece ribbons to be formed while adopting a roll winding method. And to achieve a significant reduction in material costs.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a modified ribbon formed by punching a strip into a comb-like shape. In the method of forming an inner laminated plate for a stator in which each tooth portion is radially developed by rolling as described above, the length of the bridge portion is set to the same dimension as the width of each tooth portion when forming the deformed ribbon. After thinning each bridge portion with respect to the irregularly shaped ribbon, each bridge portion is bent into a predetermined shape to reduce the interval between the tooth portions, and then rolled.

In the method for forming a laminated plate for a stator configured as described above, the length of the bridge portion is set to the same dimension as the width of each tooth portion when forming the deformed ribbon. Can take two deformed ribbons. Then, by bending the bridge portion of this irregular ribbon into a fixed shape and reducing the interval between the tooth portions to a size corresponding to the width of the groove bottom in the final shape, the tooth pitch after roll winding is not inconsistent. Will not occur. Moreover, since the bridge portion of the deformed ribbon is thinned prior to bending, the bent portions do not interfere with each other even when the formed inner laminates are laminated, and the inner laminates can be densely laminated. Become like

According to the present invention, when the bridge portion is bent, the amount of bending of the portion located inside the roll winding may be gradually increased with respect to the portion located outside the roll winding. By bending in this way,
Since the amount of shrinkage on the inner side of the roll becomes larger than that on the outer side, the deformed ribbon is deformed into a roll shape in accordance with the bending of the bridge portion, and it is not necessary to separately set a roll winding step.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show an inner laminated plate 5 formed by the method of the present invention. Since the overall shape of the inner laminated plate 5 is the same as that shown in FIG. 7 described above, here, the same parts as those shown in FIG. 7 are denoted by the same reference numerals. In this embodiment, the bridge 4 of the inner laminate 5 is provided with a V-shaped bent portion 15. The V-shaped bent portion 15 is provided such that the amount of bending at a portion located on the inner diameter side gradually increases with respect to a portion located on the outer diameter side. The bridge 4 is configured such that the thickness t ₂ of the flat plate portion (general portion) of the inner laminate 5 along the surface normal direction is slightly smaller than the thickness t ₀ of the flat plate portion (t ₀ >). t ₂ ), and the plate thickness t ₁ is adjusted (FIG. 3).

As shown in FIG. 8, the inner laminated plate 5 is formed by rolling a ribbon ribbon 11 formed by punching a strip 10 into a comb shape.
Here, when forming the modified ribbon 11, as shown in FIG.
Two 11's are taken in an inverted state. In this case, the width W of the teeth 12, 12 'of each of the deformed ribbons 11, 11' and the length S of the bridges 13, 13 'are the same (W = S). 1
The length S of the inner laminate 5 of the final shape is 3, 13 '.
Is longer than the length L of the bridge 4 (FIG. 1). Note that the width W of the tooth portion 12 is the same as the width (target width) of the tooth 3 of the inner laminate 5 having the final shape.

Next, as shown in FIGS. 5 and 6, with respect to the deformed ribbons 11 and 11 'obtained by taking two pieces as described above, as shown in FIGS.
The bridge portion 13, 13 'thinning from t ₀ to t ₁ (Fig. 3). At the time of this thinning, as shown in FIG. 6, the tooth portions 12 on both sides of one bridge portion 13, 13 'are formed.
12 'is sandwiched between the upper mold 20 and the lower mold 21, and in this state, the bridge portions 13, 13' are crushed by the upper punch 22 and the lower punch 23. In this case, the bridge unit 13, 1
Since both sides of the bridge 3 'are restrained by the upper die 20 and the lower die 21, when the upper punch 22 and the lower punch 23 are crushed, the material of the bridge portions 13, 13' escapes in the width direction. As shown in (1), the bridge portions 13, 13 'are larger than the target width. Therefore, the enlarged portions of the respective bridge portions 13 and 13 'expanded by the thinning are removed by punching, machining, or the like, and the respective bridge portions 13 and 13' are finished to the target width.

Thereafter, the process is shifted to the modified ribbons 11, 1
While feeding 1 'in one direction F as shown in FIG. 8, the bridge portions 13 and 13' are sequentially bent from the tip side using a V-shaped block (not shown), and The V-shaped bent portion 15 shown is formed. As described above, the V-shaped bent portion 15 has a shape in which the amount of bending of a portion located inside (inner diameter side) of the roll winding gradually increases with respect to a portion located outside (outer diameter side) thereof. Therefore, the deformed ribbons 11 and 11 'are curved in accordance with the bending in the same manner as the roll winding. Therefore, in this bending, FIG.
As shown in the figure, the inner and outer widths δ ₁ , δ of the bent portion 15 are obtained so that a predetermined radius of curvature R is obtained inside the roll winding and a predetermined groove bottom width L is obtained outside the roll winding. _2. Set the amount of shrinkage. Thereby, the deformed ribbon 11,
If the bent portions 15 are formed in order for the predetermined number of bridge portions 13 and 13 'of 11', the same shape as the inner laminated plate 5 having the predetermined number (here, six) of teeth 3 as shown in FIG. When the shaped ribbons 11 and 11 'are appropriately cut and the both ends of the shaped body are joined or continuously spirally wound, the inner laminate 5 is completed.

The inner laminated plate 5 thus formed is
Since the bridge portions 13 and 13 ′ including the bent portion 15 are thinned, the inner laminate 5 is laminated and the inner core 6 is formed.
When assembling (FIG. 7), the bent portions 15 do not interfere with each other, so that the general portions of the inner laminate 5 are densely laminated. Further, since the bridge 4 of the completed inner laminate 5 has increased strength due to the presence of the bent portion 15, the width thereof can be set to be narrow. As much as possible. As a result, the leakage magnetic flux passing through the bridge 4 when used as a stator is reduced, the efficiency is increased, and the motor performance is improved.

In the above-described embodiment, the amount of deformation of the bent portion 15 is changed between the inside and the outside to provide a difference in the amount of shrinkage between the inside and the outside of the roll, and the roll is automatically wound according to the bending. As described above, the bent portion may have a shape having a uniform deformation amount. In this case, even if the bridge portions 13 and 13 'are bent, the deformed ribbons 11 and 1' are bent.
Since 1 'maintains the linear shape, a roll winding step is separately set to perform roll winding. The shape of the bent portion is arbitrary, and may be a U-shape, a waveform, or the like instead of the V-shape in the above embodiment.

[0017]

As described above in detail, according to the method of forming a laminated plate for a stator according to the present invention, it is possible to take two irregularly shaped ribbons while adopting the roll winding method. Significant reduction in material costs can be achieved. Also, since the bridge portion of the deformed ribbon is thinned prior to bending, the bent portions do not interfere with each other even if the formed laminates are laminated, so that the laminated plates can be densely laminated, The performance as a stator is not impaired. In addition, since the strength of the bridge of the formed laminated plate is increased due to the presence of the bent portion, it is possible to narrow the width, and together with the thinning, the magnetic flux leakage can be reduced, and the performance can be reduced. It will contribute to improvement.

[Brief description of the drawings]

FIG. 1 is a plan view showing a shape of an inner laminate for a stator formed by a method of the present invention.

FIG. 2 is an enlarged plan view showing a portion A in FIG. 1;

FIG. 3 is a side view taken along the arrow B in FIG. 2;

FIG. 4 is a plan view showing a state of material removal according to the present invention.

FIG. 5 is a plan view showing a shape of a deformed ribbon after a bridge portion is thinned.

FIG. 6 is a cross-sectional view showing a configuration of a mold used for thinning a bridge portion.

FIG. 7 is a plan view showing the overall structure of the stator.

FIG. 8 is a schematic view showing a method of forming an inner laminate by a conventional roll winding method.

[Explanation of symbols]

 2 Outer core 3 Teeth 4 Bridge 5 Inner laminate 6 Inner core 10 Strip 11, 11 'Irregular ribbon 12, 12' Teeth 13, 13 'Bridge 15 Fold

Claims (2)

[Claims] An irregular shaped ribbon formed by punching a strip into a comb shape is roll-wound so that a bridge portion between teeth portions is on the inside, and each tooth portion is developed radially. In the method for forming a stator laminate, in forming the irregular ribbon, the length of the bridge portion is set to the same dimension as the width of each tooth portion, and after reducing the thickness of each bridge portion with respect to the irregular ribbon, A method for forming a laminated plate for a stator, wherein each bridge portion is bent into a predetermined shape to reduce the distance between the tooth portions, and subsequently roll-wound. 2. The method according to claim 1, wherein, when bending the bridge portion, the amount of bending of a portion located inside the roll winding is gradually increased with respect to a portion located outside the roll winding.
The method for forming a stator laminate according to any one of the preceding claims.