JPH0642769B2 - Method for manufacturing armature of rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an armature of a rotating electric machine, and more particularly to a method of manufacturing an armature suitable for a small rotating electric machine such as an AC generator for an automobile.

[Prior Art] In recent years, for example, AC generators for automobiles have been required to have higher output with an increase in various electric loads. One possible way to satisfy this requirement is to increase the space factor of the winding.

On the other hand, conventionally, for example, according to JP-A-52-9805,
As a structure for fixing the winding after inserting the winding into the armature of the rotating electric machine, there is disclosed a structure in which projecting portions are provided at both ends of the slot opening and the projecting portions are bent. In addition, a constricted portion is provided on the opening side of the root portion of the protruding portion to facilitate easy and reliable bending.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technique, however, there is a problem that the armature core is deformed when the protrusion is bent, mechanical strength is deteriorated particularly in the constricted portion, and further magnetic saturation is caused, and the space factor of the winding is increased. No consideration was given to boosting.

An object of the present invention is to provide a method for manufacturing an armature of a rotating electric machine, which is free from magnetic saturation due to deformation of the armature core and which can increase the space factor of the winding, in view of the above-mentioned problems of the prior art. To do.

[Means for solving problems]

The above-mentioned object of the present invention is to provide an indented deformation portion in the plate thickness direction in advance at the tip of the armature core tooth portion of the laminated plate that constitutes the armature of the rotating electric machine, and to dispose the armature in the armature slot. This is accomplished by applying pressure in the thickness direction of the armature core and crushing the recessed deformed portion after the winding has been inserted.

[Action]

As described above, the hollow-shaped deformed portion formed at the tip of the armature tooth portion is inserted into the winding, and then is pressed and deformed in the thickness direction of the core to flatten the hollow-shaped deformed portion. With this,
The leading end of the tooth portion of the armature core is widened in the lateral direction (perpendicular to the thickness direction of the laminated plate), thereby narrowing the slot opening and forming a semi-closed slot. At the same time, the lateral extension of the iron core also increases the area of the tooth tip of the iron core, which reduces the cross-sectional area of the slot into which the winding is inserted, thus increasing the space factor of the winding. Let

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an armature core 1 of, for example, an automotive alternator to which the present invention is applied. The armature core 1 has a tall portion 6 on the outer diameter side and a tooth portion 7 on the inner diameter side, and a slot 2 is formed between the tooth portions 7. Inside the slot 2, an armature winding 5 is inserted and stored via an insulator (insulator) 4 such as insulating paper.

According to the present invention, at the tip of the tooth portion 7 of the armature iron core 1, the recessed deformation portion 3 is formed in advance in the thickness direction of the laminated steel plates constituting the iron core. The state of the hollow deformable portion 3 is shown in FIG. 2 which is a sectional view taken along the line AA of FIG. As shown in the figure, the recessed deformation portion is formed at the center of the tip of the tooth portion of each laminated plate, and the armature winding winding operation is performed in a state in which these are deformed.
The recessed deformable portion 3 may be formed, for example, when the laminated plate is punched into a predetermined shape by press working or the like, or after the laminated plates are stacked, they are integrally formed by press working or the like. May be. The same applies to the case where one steel plate is spirally stacked to form an armature core.

With the above-described configuration, the cross-sectional area of the slot 2 of the armature core 6 can be made larger than the inner diameter dimension at the time of completion, particularly the opening area of the opening at the tip thereof. That is, the area of the tooth portion is reduced due to the formation of the concave deformation portion 3. Therefore, it becomes easy to wind the armature winding 5 around the armature core 1 having the above-described configuration, which contributes to improvement in workability in manufacturing. In practice, it is of course necessary to determine the inner diameter of the slot 2 in consideration of the change in the dimension of the tooth portion 7 that expands by the pressing work described in detail below.

Next, according to the present invention, the laminated armature core 1
Is pressed in the direction shown by the arrow in FIG. 2 to flatten the recessed deformed portion 3 formed at the tip of the iron core tooth portion. By this pressurizing work, the hollow deformable portion 3 is flattened, and at the same time, the respective laminated plates are laterally (the hollow deformable portion 3).
(Direction perpendicular to the direction in which the is formed). Therefore, the iron core tooth portion 7 gradually expands particularly as it goes to the tip portion thereof, and the opening portion of the slot 2 is narrowed to complete the semi-closed slot.

FIG. 3 shows a cross section of the armature in the state where the semi-closed slot is completed by the pressing work. In the drawing, a wedge 8 made of an insulating material is inserted into the slot opening so as to prevent the armature winding from jumping out by the semi-closed slot and the wedge 8. Further, due to the enlargement of the iron core tooth portion 7, the cross-sectional area of the slot 2 formed between the tooth portions is relatively reduced, whereby the armature winding 5 housed in the slot 2 is slotted. The space is compressed, that is, the space factor of the coil (the ratio of the area of the conductor portion to the slot cross-sectional area) is improved.

Further, as described above, the area of the tooth portion 7 of the armature core is increased by pressing the recessed deformation portion 3, which means that the cross-sectional area of the tooth portion 7 is increased. Moreover, since the armature core can be formed in the tooth portion 7 without causing deformation such as increase in magnetic flux density such as wedges or cuts or local concentration, it is possible to provide an armature having very good magnetic characteristics. Become.

Further, according to the present invention, a semi-closed slot shape is formed in advance by pressing or the like, and then the recessed deformed portion 3 formed at the tip of the iron core tooth portion 7 is pressed to narrow the opening of the slot 2. Since the semi-closed slot is completed by the above, the mechanical strength becomes higher and the accuracy of the iron core dimension can be maintained higher than that obtained by bending the tip projection. As a result, it is possible to provide a safe generator armature in which the armature winding does not pop out even at high rotation speeds.

In the above-mentioned embodiment, the shape of the deformable portion 3 pressed by the press working is the recessed deformable portion as shown in FIG. 2, however, according to the present invention, as shown in FIG. The same effect can be obtained even if the iron core tooth portion 7 has a stepped shape bent from the central portion.

Furthermore, in the above-mentioned embodiments, the present invention has been described as applied to the armature of an automotive alternator, but the present invention is not limited to this. For example, a sectional view of an armature when the present invention is applied to an armature of a DC motor for a starter for an automobile is shown. In the drawings, each reference number is attached with a dash, but the same numbers other than this refer to the same components as those shown in FIGS. 1 and 3 above. A fixed armature is generally used in an alternator for automobiles, while a starter for automobiles has a rotating armature type. Also, in the starter, the number of turns of the armature winding is generally 2
Approximately 5 coils, and in the embodiment shown in FIG. 5, three armature windings are inserted in the slot. Further, in this embodiment, since the winding diameter is relatively large, a wedge or the like is not used for the semi-closed slot at the slot opening. As described above, when a wedge or the like is not used for the slot opening, for example, according to the above-mentioned conventional technique, the tip of the bent protrusion damages the insulating coating on the surface of the armature core into which it is inserted. Therefore, the insulation characteristics of the starter motor may be deteriorated.
On the other hand, in the above embodiment, as shown in FIG.
The inner peripheral surface of the tooth portion of the slot tip portion is previously press-molded into a substantially arc-shaped smooth shape, and the tooth portion tip portion of the iron core 1'is enlarged by the subsequent pressing deformation of the deforming portion 3 '. Does not scratch the winding coating.

〔The invention's effect〕

As is clear from the above, according to the present invention, it is possible to provide an armature for a rotary electric machine that can increase the space factor of the windings with a small amount of magnetic saturation and thus generate a high output.

[Brief description of drawings]

1 is a sectional view of an embodiment in which the present invention is applied to an armature of an automotive alternator, and FIG. 2 is an AA of FIG.
FIG. 3 is a cross-sectional view, FIG. 3 is a cross-sectional view showing a state after pressure processing of the armature core of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 1 for showing another embodiment of the present invention. It is a figure which shows an AA cross section, and FIG. 5 is a cross section of an embodiment in which the present invention is applied to an armature of a starter DC motor for an automobile. 1 ... Armature iron core, 2 ... Slot, 3 ... Recessed portion,
5 ... Armature winding, 6 ... Iron core, 7 ... Iron core tooth part.

Claims (1)

[Claims] 1. An armature slot formed by stacking core steel plates formed into a plurality of predetermined shapes and provided with a recessed deformation portion in the thickness direction of the tooth center end in advance, , The armature winding is inserted through the insulator, and then the deformed portion is flattened by pressing the armature iron core in a direction perpendicular to the steel plate surface, and thus the armature core tooth portion is made to face the steel plate surface direction. A method of manufacturing an armature for a rotating electric machine, comprising forming a semi-closed slot while enlarging.