JPH1198743A - Armature winding, and its insertion method into groove of iron core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To see that the method of insertion of a double winding having a strong point in design into an iron core groove becomes easy, in the case of a random winding similar to the case of a chain winding. SOLUTION: First, twelve pieces of coils of U-phase are inserted severally, into the specified iron grooves 11 of an iron core 1. At that time, the two straight parts, which are opposite to each other, being inserted into the iron core grooves 11 of each coil are inserted on their inside, for the iron core grooves wherein they are to be inserted first, and on their outside, for the iron core grooves 11 wherein they are to be inserted later with existence of coils already inserted, respectively. In this way the necessity for floating in advance the other straight parts of plural pieces of coils inserted first as a conventional method is obviated, and since they are inserted separately for each phase, the connection places of element wires can be removed by making the twelve pieces of coils for constituting one phase a twelve-piece set constituted of one element wire. Furthermore, since an automatic inserter adopted for a random winding one-layer chain winding can be used, the insertion work into an iron core groove can be made more efficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a relatively small-capacity armature winding for an induction machine, a synchronous machine, etc., and in particular, a winding coil formed by bundling a plurality of turns of a thin wire such as a round wire. The present invention relates to an armature winding and a method for inserting an iron core groove.

[0002]

2. Description of the Related Art The stator of an induction motor is generally called an armature, its core is called an armature core, its winding is called an armature winding, and so is a synchronous machine. There are several types of armature windings according to the classification method. The winding methods are classified into chain winding (or concentric winding) and double winding, and single-layer winding and double-layer winding depending on the number of layers. The lap winding is simultaneously a two-layer winding, that is, a two-layer lap winding, and the chain winding is generally a single-layer winding, that is, a single-layer winding (Electrical Engineering Handbook, 1962, p.562).

[0003] The two-layer lap winding has the advantage that the degree of freedom in design is high such that the number of grooves per pole may be a non-integer number, and an optimum design is possible. However, there is a disadvantage that the operation of inserting the coil into the iron core groove is complicated as described later. On the other hand, in the case of a single-layer wound winding, there is a disadvantage that the winding must be all sections and the number of grooves per pole must be an integer. There is an advantage that the target is simple. In general, double-layer wrap windings are employed in all large-capacity machines and are often employed in small-capacity machines, whereas single-layer chain windings are employed only in small-capacity machines.

[0004] There is also a classification called a turbulent coil or a drop coil relating to the sectional shape of the coil, a forming method based on the same, and a method of inserting the coil into the iron core groove. A turbulent coil is a coil that has a large number of turns and a small cross-sectional area of the wire, generally a round wire is used, and each wire is disjointed before being inserted into the iron core groove. It can be inserted into the iron core groove in a state, and is also called a pick-up coil. A drop coil is a coil with a large cross-sectional area of the wire, which is molded before being inserted into the iron core groove,
It is inserted into the iron core so as to be dropped, and in a large-capacity machine, it is all the dropped coil.

FIG. 6 is a winding arrangement diagram of a three-phase armature winding. In this figure, since the number of grooves is 36 and the number of poles is 10,
The number of grooves per pole is 3.6, which is a double-layer lap winding having an irregular number of groove windings. In this figure, the upper numeral is the number of the iron core groove, and there are 36 iron core grooves up to the rightmost 36, with the leftmost iron groove being 1, and the right side of this figure is the leftmost 1 in the figure.
Lead to the iron groove. The winding layouts shown for each phase are U-phase, V-phase, and W-phase from the top. The V-phase is the same as the U-phase, with the number of iron core grooves shifted by 12 to the right. Thus, the W phase is arranged further shifted rightward from the V phase by the iron core groove 12.

Each coil is shown as a hexagon, and two straight portions in the vertical direction in the drawing are straight portions inserted into the iron core groove, and a portion connecting these two straight portions up and down is a coil end portion. Each coil is a turbulent coil having several tens of turns, and its element wire is a round wire having a diameter of 1 mm or less and coated with enamel. The hexagonal shape of the coil is customary when the armature winding is illustrated by simulating the shape of the coil in the case of a drop-in coil.However, in the case of a spirally wound coil, the corners have an appropriate curvature. In fact, it has a substantially rectangular shape bent.

The coil arrangement will be described by taking the U phase as an example.
The coil from which the U terminal connected to the external terminal is
Assuming one coil, this U1 coil has iron core groove numbers 8 and 1
In the figure, the X terminal, which is simply inserted as 1 in the figure, is drawn out from the U12 coil, which is the last coil. The other coils are also numbered 2 to 11, respectively.
Is the number of each U-phase coil. As described above, the number of iron core grooves per pole is 3.6, whereas all coils are a kind of short-section winding because two straight portions are inserted into grooves 3 apart from each other. . Since the number of iron core grooves is non-integer, the coils are not arranged at regular intervals but are arranged non-uniformly such that they overlap or separate as shown in the figure.

FIG. 7 shows a two-layer lap winding composed of a turbulent coil.
FIG. 3 is a cross-sectional view of one iron groove and a coil housed in the iron groove. In this figure, the upper side is the inner diameter side, the lower side is the outer diameter side, and the iron core groove 11 has an eggplant shape with a larger width on the outer diameter side than on the inner diameter side, and the coil is inserted from the opening 12. You. An inner coil 22 is disposed on the outer diameter side of the iron core groove 11 and an outer coil 21 is disposed on the inner diameter side, and an interphase insulating paper 15 is provided between them. Ground insulating paper 14 is provided between the inner surface of the iron core groove 11 and the coil, so that insulation between the coils 21 and 22 and the iron core 1 is ensured.

The inner coil 22 and the outer coil 21 are each inserted with a plurality of strands made of the above-mentioned enamel-coated round wire, and are actually packed tightly with the insulating paper in the space of the iron core groove 11. However, in this figure, it is drawn with appropriate gaps to make it easy to understand.
When the inner coil 22 and the outer coil 21 are the same phase coil, for example, in the case of the iron core groove number 11 in FIG. 6, the interphase insulating paper 15 is unnecessary.

The wedge 13 is for fixing the inner coil 22 and the outer coil 21 in the iron core groove 11, and is inserted from the vertical direction in the drawing after all the coils and necessary insulating paper are inserted. FIG. 8 is a coil end configuration diagram showing the configuration of the coil end viewed from the axial direction of a conventional two-layer lap wound coil. In this figure, a bundle of a plurality of element wires of a coil is indicated by one line, and a position coming out of the iron core groove 11 is indicated by a black circle. The coil shown in this figure is composed of an armature winding having the coil arrangement diagram shown in FIG. The U1 coil located on the right side of the figure has the inside of the core groove number 11 and the core groove number 8
Is connected at the coil end, which is consistent with the U1 coil in the winding arrangement diagram of FIG. The same applies to other coils.

In the conventional two-layer lap wound coil, each of the rectangular coils is inserted into the iron core groove 11 such that if one linear portion is inside, the other linear portion is outside. Therefore, as shown in FIG. 8, the coil ends are arranged in an orderly manner. As described above, since an actual coil is formed by bundling a plurality of wires, adjacent coil ends are in contact with each other and are densely arranged. All the coils other than the U1 coil have the same core groove numbers as those in FIG. 6 into which the two linear portions are inserted. Therefore, in FIG. 8, only the right half is given the coil number.

In the case of a conventional two-layer lap wound coil, as described above, one straight portion is always the inner coil 22 and the other straight portion is the outer coil 21, so the order of inserting the coils into the iron core is as follows. become. There is no particular limitation on which coil to start insertion from, but here, it is assumed that insertion starts from the U1 coil. First, one straight part of the U1 coil is inserted into the core groove number 11, and the straight part to be inserted into the core groove number 8 is the core groove number 8.
Get out and float. Next, one of the linear portions is inserted into the iron core groove numbers 12 and 13 while the V9 coil and the W6 coil are the same as the U1 coil, and the other linear portions to be inserted into the iron core groove numbers 9 and 10 are left floating. One of the straight portions of the U2 coil is inserted into the core groove number 14, and the other straight portion is also inserted into the core groove number 11. Since the U1 coil is already inserted into the iron core groove number 11, the U2 coil is inserted as an outer coil thereon. In this case, since the phases of the two coils inserted into the iron core groove number 11 are the same, the interphase insulation 15 is unnecessary. As in the case of the U2 coil, both straight portions are inserted into the core grooves of the corresponding numbers. When the phases of the two coils inserted into one iron core groove are different, the interphase insulating paper 15 is inserted before inserting the coil later. The same insertion operation is repeated up to the U12 coil. Insert a V8 coil into core groove numbers 5 and 8 and insert insulating paper between phases 1
The other straight part of the U1 coil that has been floated after the insertion of No. 5 is inserted into the iron core groove number 8. The same applies to the W4 coil and the W5 coil. This completes the insertion of all coils. The coil is fixed in the core groove 11 by driving a wedge 13 into each core groove. An interphase insulating paper is inserted into a portion where coil ends of different phases are adjacent to each other, and the coil end of each phase and the interphase insulating paper are collectively tied with a string to integrate the coil end portions.

Thus, the operation of inserting the coil into the iron core is completed. However, detailed operations not directly related to the present invention have been omitted as appropriate. When the coil insertion operation is completed, the varnish is impregnated and further cured to mechanically integrate the coil and the coil end in the iron core groove with the iron core.

[0014]

As described above, in the case of a two-layer lap wound coil, each of the coils is arranged such that one straight portion of one coil is the inner coil 22 and the other straight portion is the outer coil 21. Insert into the iron core groove in order regardless of the phase of the coil. At that time, it is necessary to keep the straight portion that is to be the outer coil 21 of the first few coils floating without inserting it into the iron core groove. Therefore, there are the following problems. Since the coil cannot be inserted for each phase, the configuration of the interphase insulating paper 15 at the coil end becomes complicated, and the insertion operation takes time. Since the other straight portions of the several coils to be inserted first must be left floating, the insertion operation is difficult. If coils of the same phase are inserted one after the other, these coils can be so-called individual strands in which the strands are kept continuous. For example, since the U4 and U5 coils in FIG. 6 are successively inserted into the iron core groove, a so-called two-piece series in which two coils are formed by continuous strands can be used. Therefore, it is possible to eliminate one wire connection portion as compared with a case where all the wires are connected. As is clear from FIG. 6, the combination of U10 and U11 in addition to the above-described U4 and U5 is such a double. All other coils are single-piece. Therefore, when 12 coils constituting one phase are connected in series as shown in FIG. 6, it is necessary to connect nine wires. The number of connection points of the strands is preferably small because connection work is required, and it is desirable that the number of connection points be small in terms of reliability. Due to the above-mentioned problems, an automatic device for inserting a core groove of a coil, which can be employed in a chain winding, cannot be used. Therefore, since the operation of inserting the coil into the iron core groove has to rely on manual work, the efficiency of the operation is poor.

An object of the present invention is to solve such a problem and to provide the same advantages as a chain winding, that is, an armature winding which is easy to insert a core groove of a coil while having the advantages of a double-layer winding. An object of the present invention is to provide a wire and a method for inserting a core groove thereof.

[0016]

According to the present invention, there is provided a method of inserting a core groove in an armature winding of an armature winding employing a randomly wound double-layer winding, according to the present invention. A coil formed by winding a wire a plurality of turns into a rectangular shape has a core groove for inserting two opposing straight portions inserted into the iron core groove. Inside, if not already inserted,
By inserting each coil, it is not necessary to keep the straight portions of the coils inserted outside the iron core grooves of several coils to be inserted first, so that the insertion operation is facilitated.

In an armature winding composed of a plurality of phases such as two-phase or three-phase, if the above-described winding insertion method is adopted,
After inserting all the coils of one phase into the iron core groove, insert the coils of the other phase, that is, it is possible to insert into the iron core groove for each phase, by adopting such a method, In addition to facilitating the insertion of interphase insulation at the coil end, an automatic insertion device that is employed in a turbulent single-layer chain winding and is effective for automating the operation of inserting the coil into the iron core can be used.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 is a view showing the configuration of a coil end portion viewed from the axial direction of a coil end portion in which only a U-phase coil according to an embodiment of the present invention is inserted into a core groove, and FIG. 2 is a V-phase coil in addition to FIG. Coil end configuration diagram of the coil end with inserted
FIG. 3 is a coil end configuration diagram of a coil end in a state in which a W-phase coil is inserted in addition to FIG. 2. The coil ends are shown by one thick solid line, and the previously inserted coil ends are shown by thin lines. In addition, the insertion position of each coil in the iron core groove is based on FIG.
That is, except for the coil end configuration, the induction motor of the present invention is the same as that of the prior art.

FIG. 1 is a block diagram showing a case where the insertion is started from the U1 coil and the respective coils are sequentially inserted in the clockwise direction, similarly to FIG. Depending on which coil is inserted, whether it is the inner coil 22 or the outer coil 21 differs even if the winding layout is the same. As will be described later, in this embodiment, all 12 coils are 1
Since it can be a series of 12 composed of two strands,
In such a case, the U1 coil connected to the U terminal or X
It is necessary to start insertion from the U12 coil connected to the terminal. Because the U1 coil is the first coil inserted,
Each of the two straight portions is inserted inside the iron core groove. That is, the U1 coil is inserted into the iron core groove numbers 8 and 11, but both become the inner coil 22. In the U2 coil, one straight portion is inserted into the same core groove 11 as the U1 coil, so the coil of this core groove becomes the outer coil 21, and the other linear portion becomes the inner coil 22 because the core groove number 14 is inserted for the first time. . Both of the core groove numbers 15 and 18 into which the U3 coil is inserted become the inner coil 22 because the coil is inserted for the first time.

Similarly, in the iron core groove into which the coil is inserted first, the coil is inserted into the inner coil 22, and the coil inserted later is inserted into the outer coil 21, and U12 is inserted into the U-phase winding. Is completed. The result is the coil end configuration diagram shown in FIG. 1. In actuality, the coil is configured by bundling a plurality of wires, and the coil end is located on the outer diameter side as shown in the figure. V-phase and W are not molded to expand but are inserted later
The fact is that the phase is pushed to the outer diameter side and swells to the outer diameter side.

In FIG. 2, it is assumed that insertion starts from the V1 coil. Since the U-phase coil indicated by the thin line has already been inserted, the outer coil 21 increases in the case of the V-phase coil. The V1 coil is inserted into the core groove numbers 20 and 23,
Since no U-phase coil is inserted in both of the core groove numbers 20 and 23, both core grooves are the inner coils 22. Since the V1 coil is already inserted into the iron core groove number 23 into which the V2 coil is inserted, and the U-phase coil is already inserted into the iron core groove number 26, both become the outer coils 21. Since the core groove numbers 27 and 30 into which the V3 coil is inserted have not yet been inserted with the coil, both become the inner coil 22.

Similarly, up to the V12 coil is inserted, and the operation of inserting the V-phase winding is completed. Before the V-phase winding is inserted, the interphase insulating paper 15 is inserted in the core groove 11 in which the U-phase winding is already inserted. By inserting the V-phase winding, the U-phase coil end is pushed to the outer diameter side by the V-phase coil end.

In FIG. 3, it is assumed that insertion starts from the W1 coil. Since the U- and V-phase coils indicated by thin lines have already been inserted, the W-phase coil is more likely to be the outer coil 21 than the V-phase coil. Since the coil has already been inserted into the core groove number 32 into which the W1 coil is inserted, the outer coil 21 is formed, and the core groove number 35 becomes the inner coil 22 since the first insertion is performed. Since the W1 coil is inserted into the iron core groove number 35 into which the W2 coil is inserted, and the V-phase coil is inserted into the iron core groove number 2, both become the outer coils 21. Since the U-phase coil is inserted into the core groove number 3 in which the W3 coil is inserted, the outer coil 21 is formed, and since the core groove number 6 is the first time, the inner coil 22 is formed.

Similarly, the W12 coil is inserted last, and the work of inserting the W-phase winding is completed. Also in the case of the W-phase winding, the interphase insulating paper 15 is inserted in advance into the iron core groove 11 into which the U or V-phase winding is inserted. By inserting the W-phase winding, the U-phase and V-phase coil ends are pushed outward by the W-phase coil ends.

FIG. 8 is a configuration diagram of the conventional coil end portion described above.
In the case of (1), the coil ends are arranged neatly, whereas in the case of FIG. 3, the arrangement is cluttered. At first glance, the method of inserting the core groove of the armature winding, which results in such a complicated arrangement, has an impression that it cannot be implemented. This is the reason why the method of inserting the core groove of the winding as in this embodiment was not adopted.

The inventors of the present invention have conducted tests on the assumption that such a method of inserting an iron core groove into a winding may be possible, and as a result, it has been found that the method is possible as described above. After the insertion operation is completed, the coil end has a complicated or random arrangement and configuration as can be inferred from FIG. However, the coil ends of the phase inserted earlier are pushed to the outer diameter side and escape, so that each coil end is not forced to have an unreasonable shape. It can be said that such a configuration is made possible only by the flexibility of the coil end portion, and this flexibility is due to the coil configuration being turbulent. Therefore, the configuration of the coil end portion and the method of inserting the iron core groove in the winding in which the configuration is formed can be realized only when the coil is irregularly wound.

Although the above embodiment is based on the winding arrangement diagram of FIG. 6, it is based on a specification in which a chain winding cannot be used. As can be easily understood from the above-described embodiment, there is no limitation on the winding layout in implementing the present invention. For example, even if the pole pitch is not a non-integer like 3.6 but an integer, it does not hinder the implementation of the present invention. Therefore, the present invention can be applied to all two-layer lap windings in which the turbulent winding is employed. Further, the present invention is not limited to an induction motor, but can be applied to a synchronous machine having a similar armature structure.

The above-described embodiment employs a method of inserting a winding for each phase in the order of U, V, and W.
This is a method by which the effects of the present invention can be maximized. However, the essence of the present invention is that, based on the order of insertion of the respective coils, the inner coil 22 is used for the core groove for inserting the straight portion of each coil for the first time, and the outer coil 21 is used for the core groove inserted later. Exhausted. Therefore, for example, when the core groove of the winding is inserted in the same insertion order as in FIG. 8, it is not necessary to float the straight portion of the coil that will be the outer coil 21 of the first three coils, and therefore, it is unnecessary. In addition, the effect that the insertion work becomes easy can be obtained. This effect is the greatest effect in the present invention.

FIG. 4 is a vertical sectional view of an automatic insertion device showing a second embodiment of the present invention, and FIG. 5 is a plan view of the same. In FIG. 4, the automatic insertion device 3 includes a support base 31, a cylindrical portion 32,
An iron core supporting portion 3 protruding to the outer diameter side at substantially the center of the cylindrical portion 32.
3, and the left half is not shown because it is an axially symmetric structure having the center axis 100 as a symmetric axis. As can be seen from FIG. 5, the cylindrical portion 32 is divided in the circumferential direction and has a configuration like a snake's umbrella bone, and the gap between each bone matches the iron core groove 11 of the iron core 1. Iron core 1
Is inserted into the outer diameter side of the cylindrical portion 32 from above and is stopped at a predetermined axial position by the iron core supporting portion 33. Since the outer diameter of the cylindrical portion 32 corresponds to the inner diameter of the iron core 1 and the number of bones of the cylindrical portion 32 corresponds to the number of the iron core grooves 11, these values differ from each other.
, A different automatic insertion device 3 is used. The automatic insertion device 3 is used for a randomly wound winding.

The upper part of FIG. 5 is a view as seen from the arrow P in FIG. 5, and the lower part of FIG.
FIG. And the lower diagram shows each U
Cylindrical part 3 corresponding to the position of the iron core groove where the phase coil is to be inserted
2 shows a state inserted between the respective bones. The number of the iron core groove, the position of the coil and the number are the same as those in FIG. Also, FIG. 4 illustrates three coil positions schematically illustrating a process in which the U-phase coil inserted into the lower part of the automatic insertion device 3 is inserted into the iron core groove 11 of the iron core 1 as shown in FIG. , The bottom solid line is U1-
A state immediately after the U12 coil is inserted into the automatic insertion device 3,
The position of the coil in the floating state at the center indicated by the two-dot chain line is a state when 12 coils are lifted by a jig (not shown), and the upper coil position indicated by the two-dot chain line is the iron core groove 11.
Shows a state inserted in the box. Below, the automatic insertion device 3
The outline of the operation of inserting the coil into the iron core groove by using is described in order. The twelve U-phase coils are manufactured as coils having a predetermined number of turns by a separate winding machine as twelve continuous strands. The same applies to the V-phase coil and the W-phase coil. The 12 coils are inserted into the gaps between the bones of the cylindrical portion 33 of the automatic insertion device 3 and into the gaps between the bones corresponding to the iron core groove numbers based on the winding arrangement diagram in FIG. At this time, the device for this insertion is used, but the explanation is omitted. The core 1 is mounted on the cylindrical portion 32. Hold the coil end in the cylindrical portion 32 of each coil and pull up. That is the center coil position in FIG. Further, by lifting the coil and moving the coil end on the upper side of the drawing in the outer radial direction, the linear portion of each coil is inserted into the corresponding iron core groove 11.
The lifting of the coil ends is performed by using 12 coils at a time, and a jig suitable for this is used. The iron core 1 is pulled out from the cylindrical portion 32 and moved to another place to perform operations such as adapting the coil in the iron core groove 11 and inserting the interphase insulating paper 15. The above is repeated for the 12 coils of the V phase. The above is repeated for the 12 coils of the W phase.

After this, a process irrespective of whether or not the automatic insertion device 3 is used continues, and the content is similar to that of the conventional double-layer winding, so that the duplicated description will be omitted. As described above, by applying the present invention, it becomes possible to apply the automatic insertion device 3 to a two-layer lap winding, which was impossible with the conventional iron core groove insertion method.

[0032]

As described above, according to the present invention, the iron core groove for inserting the two linear portions of the coil is provided on the outside when another coil is already inserted, and is provided on the inside when not yet inserted. By inserting each of them, it is not necessary to float the linear part of the coil inserted outside the iron core groove of the first few coils, so that the insertion work becomes easy and the man-hour is reduced. Thus, the effect of reducing the cost of the product can be obtained.

In the case of a plurality of phases, if the above-described winding insertion method is adopted, after inserting all the coils of one phase into the iron core groove,
Since it is possible to adopt a phase-by-phase insertion method of inserting coils of other phases, it is possible to manufacture a plurality of coils constituting each phase with a common strand and eliminate connection points of strands. Since the connection work can be performed, effects such as reduction in man-hours due to elimination of connection work, cost reduction, and improvement in reliability can be obtained. In addition, the effect of reducing man-hours and the effect of cost reduction can be obtained from the viewpoint that the interphase insulation at the coil end can be easily inserted. Furthermore, since the automatic insertion device used for the armature winding composed of the turbulent single-layer chain winding can be used, it is possible to further reduce the man-hour and cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a coil end portion in a state where the first phase of an armature winding according to the present invention is inserted into an iron core groove.

FIG. 2 is a configuration diagram of a coil end portion in a state where the next phase is further inserted from the state of FIG. 1;

FIG. 3 is a configuration diagram of a coil end portion in a state where the last phase is inserted from the state of FIG. 2;

FIG. 4 is a vertical sectional view for explaining an automatic insertion device and an operation of inserting a coil into a core groove using the automatic insertion device.

5 is a plan view of FIG. 4, in which the upper part is a view as seen from an arrow P, and the lower part is a view as seen from an arrow Q.

FIG. 6 is a winding layout diagram of a three-phase armature winding;

FIG. 7 is a cross-sectional view of one core groove of a two-layer lap wound coil composed of a turbulent coil and a coil housed in the core groove;

FIG. 8 is a configuration diagram of a coil end portion of a conventional two-layer lap winding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Iron core, 11 ... Iron core groove, 21 ... Outer coil, 22 ... Inner coil, U1-U12 ... U-phase coil, V1-V12 ...
V-phase coil, W1 to W12: W-phase coil, 3: Automatic insertion device

Claims (4)

[Claims] 1. A method of inserting an iron core groove in an armature winding employing a turbulent double-layer lap winding, comprising: forming a rectangular coil by winding a plurality of turns of an insulated wire; The core grooves for inserting the two opposing straight sections to be inserted into the core grooves are inserted outside if another coil is already inserted, and inside if not already inserted. A method for inserting an iron core groove in an armature winding. 2. An armature according to claim 1, wherein, in the armature winding composed of a plurality of phases, all coils of one phase are inserted into the iron core groove, and then coils of another phase are inserted. Insertion method of core groove of winding. 3. An armature winding manufactured based on the iron core groove inserting method according to claim 1. 4. An armature winding manufactured based on the iron core groove inserting method according to claim 2.