JPS63234851A - Connection of multiplex winding hexagonal stator coil - Google Patents

Abstract

PURPOSE:To facilitate wiring and connection work, by alternately arranging winding units different dislocating direction of strands one after another in a unipolar monophasic groove. CONSTITUTION:A three-phase stator winding is formed by connecting the space of winding units with an interpole connecting line which units are composed of multiple hexagonal coils 2 having multiple steps of strands a-f and arranged and formed one after another in a unipolar monophasic groove of stator core grooves 1. With this winding the abovementioned winding units consist of one that dislocated a strand (f) of lower step at the bottom coil lead wire section 5 of a coil 2 to the upper step and connected and formed respectively to the strands f-a at upper coil lead wire section 6 of the adjacent coil 2 and of the other that dislocated the strand (f) to a lower step in the same way and connected and formed. These winding units different in dislocating direction are alternately arranged one after another. Thus, in case the number of unipolar monophasic grooves is less than that of the steps of the strand, the dislocation can easily by performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of connecting a multi-wound hexagonal stator coil (hereinafter referred to as a hexagonal coil).

[Conventional technology]

For the stator windings of synchronous machines and induction machines, single-turn half coils, which are suitable for high voltages and large currents, are used for medium and large capacity machines, and tortoise shell coils, which are easy to manufacture, are used for small capacity machines. There is. In addition, since alternating current flows through these coils, the coil conductors are made from a few insulated conductors to tens of elements, each with the purpose of reducing eddy current loss and skin effect within the coil, and to facilitate processing. It is made up of lines. Furthermore, for the purpose of reducing eddy current loss, a one-turn half-coil was developed using the
As described in Japanese Patent Publication No. 31039 and Japanese Patent Publication No. 5G-14141, all strands are transposed within the stator core groove.

Generally, a hexagonal coil is manufactured by winding a bundle of strands around a hexagonal mold and shaping it. Dislocation of each strand within the core groove requires a very complicated and troublesome working method, requires a lot of manufacturing time, and is expensive. In addition, since the hexagonal coil is used for small and medium capacity machines, sufficient transposition effect is not required, so as described in Japanese Utility Model Publication No. 32-13929, one stage of strands of wire is inserted at the end of the coil. As described in the transposition method and Japanese Utility Model Publication No. 48-17927, the coils are not transposed in any way, and when connecting adjacent coils, the steps of each strand are shifted one step at a time. , methods of obtaining dislocation effects, etc. were used.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology generally achieves its effect by transposing one stage of strands at the end of a hexagonal coil and connecting it to an adjacent coil, as in Japanese Utility Model Publication No. 32-13929. The disadvantage of this structure is that all the coils are transposed in the same direction, so it is effective when the number N of grooves (slots) per pole and phase is N>n from the wire stage n, but when N has no effect. This is because in order to maintain the electrical angle of 120° for each phase in a three-phase connection, the direction of the current is reversed every number of slots for one pole and one phase of the stator winding to obtain an electrical angle of 120°, so N< This is because in the case of n, the current does not flow through all the wires in the wire stage and circulate, but the current flows through the wires of each group in the wire stage and circulates. This is not desirable because a potential difference occurs between the strands of each group, causing an overcurrent to flow.

In addition, in Japanese Utility Model Publication No. 48-17927, after incorporating a hexagonal coil without transposition into the stator core, when connecting to an adjacent coil, the wires are connected by shifting one step to produce a transposition effect. ing. However, if all connections are made by the same method, efficient transposition cannot be obtained as in the above-mentioned Japanese Utility Model Publication No. 32-13929. When connecting the hexagonal coils, you just need to check the direction of the current and choose a connection method that matches the direction of the current. However, now that large-capacity machines use tortoise-shell coils with many strands of wire, the connection method becomes complicated and requires advanced technology due to the large number of strands of strands.

Therefore, there was a problem in that the people who engaged in the connection work were limited to skilled people.

The present invention has been made in view of the above points, and is a multi-wound hexagonal fixation that makes it possible to easily and sufficiently perform dislocation even when the number of grooves on one pole and one phase is less than the number of strands. The purpose of this invention is to provide a method for connecting child coils.

[Means for solving problems]

The above purpose is to transpose the winding unit in the one-pole, one-phase groove from the lower strand of the bottom coil outlet of the hexagonal coil to the upper tier, and to transfer the strands of the lower strand of the bottom coil outlet of the hexagonal coil to the strands of the upper coil outlet of the adjacent coil. One is formed by connecting the upper strands of the upper coil outlet of the hexagonal coil, and the other is formed by transposing the upper strands of the upper coil outlet of the hexagonal coil to the lower tier and connecting them to the strands of the bottom coil outlet of the adjacent coil. However, this can be achieved by alternately arranging winding units having different transposition directions in sequence.

[Effect]

Since the winding units in one pole and one phase groove are formed by hexagonal coils with different transposition directions in order, the current in each stage of the strands of the hexagonal coil of the three-phase stator winding is equal to that of each stage. It flows and circulates through the wire.

The current in the strands of each stage does not flow through the strands of each stage.

The flow and circulation between certain strands in groups is eliminated, and even when the number of grooves per pole and one phase is smaller than the number of strands of strands, dislocation can be easily and sufficiently performed.

In other words, three-phase wiring requires an electrical angle of 120° for each phase. The electrical angle between the north and south poles is 1.80'.

The electrical angle of one phase divided by three phases is 180°/3 = 60
°. The electrical angle between phase 1 and phase 2 is 60°.

The electrical angle between the 1st phase and the 3rd phase is 60'' + 60°=120', and in order to make the 60° electrical angle between the 1st phase and the 2nd phase 120°, an electrical angle of 180° should be added.

If you add 1800, it becomes 24o0, which means 1 phase 0° and 240
'The phase difference is 12°, and a three-phase connection is established. In order to add this electrical angle of 180°, it is preferable to reverse the current direction of the second phase. That is, the wires are connected with the direction of current reversed for each number of poles and grooves per phase. By arranging coils with different transpositions in a hexagonal coil in which the current direction is reversed, a sufficiently good transposition can be obtained.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-20. It has multiple stages of strands a = f, and stator core groove 1
A 3-phase stator winding is created by connecting the winding units with inter-pole connecting wires 3a and 3b, each of which is a winding unit consisting of a plurality of hexagonal coils 2 arranged and formed in order in one pole and one phase groove. Form line 4. In this embodiment, in the three-phase stator winding 4 configured as described above, the winding unit in one pole and one phase groove is connected to the lower strand f of the bottom coil outlet 5 of the hexagonal coil 2 to the upper strand. The upper coil outlet part 6 of the hexagonal coil 2 is connected to the strand f = a of the upper coil outlet part 6 of the adjacent coil 2.
The upper strand f is transposed to the lower tier and connected to the strands a '' f of the bottom coil outlet 5 of the adjacent coil 2, and these winding units with different transposition directions are formed. Arranged in alternating order.

By doing this, even when the number of one-pole, one-phase grooves is less than the number of strands of strands, the transposition can be easily and sufficiently achieved. It is possible to obtain a method for connecting the multi-wound tortoise-shell stator coil 2, which makes it possible to easily and sufficiently perform dislocation even if there is a wire.

That is, the hexagonal coil 2 consists of an upper coil 7 and a bottom coil 8, has multiple stages of strands a to f, and is housed in the stator core groove 1 (see FIG. 3).

A coil A is obtained by transposing the lower strand f to the upper tier at the position of the bottom coil outlet 5 of the tortoise-shell shaped coil 2 constructed in this way with the transposition part 9 (Figs. 8 to 11). reference). Further, a coil B is obtained by transposing the upper strand f to the lower tier at the position of the upper coil outlet 6 with the transposition part 10 (see FIGS. 12 to 15). By doing so, adjacent series of coils A are connected by adjacent branches 11 as shown in FIG. 1 as follows.

The strand a of the bottom coil outlet 5 is connected to the strand a of the upper coil outlet 6 of the adjacent coil. Similarly, the strands of the bottom coil outlet 5 are connected to the strands C of the upper coil outlet 6 of the adjacent coil, the strands C to strands d, the strands d to strands e, and the strands e is connected to the strand f, and the strand f is connected to the strand a, respectively. On the other hand, as shown in Fig. 2, the adjacent coil B is connected as follows.
Adjacent branches 12 are connected as follows. The strand f of the upper coil outlet 6 is connected to the strand a of the bottom coil outlet 5 of the adjacent coil, the strand a is connected to the strand A, the strand C is connected to the strand C, and the strand C is connected to the strand C. d, the wire d is connected to the wire e, and the wire e is connected to the wire f.

The coils A and B are arranged alternately in order for each pole and each phase groove. That is, as shown in FIGS. 16 and 17, which show the wiring diagrams of the three-phase stator winding 4, the coil A is placed on the right side (→) in the figure, and the direction of the current is on the right side (→) in the figure. Middle left (
Place coil B in the part ←). In this way, the current entering from the line side V phase will flow from the bottom coil of coil NαIA to the upper coil of coil NαIA in slot Nα8S.
The coil flows from the upper coil of the coil NαIA in the slot Nα8S to the coils Nα2A and 3A through the above-mentioned adjacent branch portions 11, forming a winding unit in the one-pole, one-phase groove in which the coil A is arranged. As shown in FIGS. 4 and 5, the upper coil outlet of the coil Nα3A of the slot NαIO3 is connected to the coil Nα6B via the inter-electrode connecting wire 3a.

Since the coil B is arranged in the coils Nα6B, 5B, and 4B, the coils Nα6B, 5B, and 4B are connected by the above-mentioned adjacent branch parts 12, and the windings in the one-pole, one-phase groove in which the coil B is arranged are connected. A line unit is formed. That is, from the upper coil of coil Na6B of slot Na19S to the bottom coil of coil Nα6B of slot Nα12S, slot N
Adjacent branch 1 from the bottom coil of α12S coil N16B
2, and is connected to coil N (15B and 4B in this order).

As shown in FIGS. 6 and 7, from the bottom coil outlet of the coil Nc4B in the slot Nn1O8, the coil A is arranged through the inter-electrode connecting wire 3b, and the coil Nα7A is connected to the coil A.
connected to. Hereinafter, the adjacent branches 11 and the interphase connection line 3
a, the adjacent branch portions 12 and the inter-electrode connection line 3b are connected to the terminal Y through the slot Na1OO8 by repeating the adjacent connection and inter-electrode connection alternately. The U and W phases are also formed in the same manner as in the above case.

In this case, the movement of the wire, that is, the current flowing through the wire, is
This will be explained with reference to FIGS. 8 to 20. The current entering from the V phase on the line side flows through each strand f of multiple stages of the coil &LA in the 1-pole 1-phase groove where the coil A is placed.

It is divided into at by Q, a, and e, but the coil Na I
The current flowing through the wire f of A flows through the adjacent branch portion 11 to the wire 11Ae of the coil Nα2A as indicated by the arrow in the figure, and further flows to the wire d of the coil Nα3A via the adjacent branch portion 11. The flow flows from the strand d of the coil N113A to the strand C of the coil Nα6B in the one-pole, one-phase groove in which the coil B is arranged, via the inter-electrode connecting wire 3a. It flows from the strand C of the coil Nα6B to the strand of the coil Nα5B via the adjacent branch portions 12. Similarly, the strands flow through the adjacent branch portions 12 to the strands a of the coil &4B. From the wire a of the coil Nα4B, the wire I of the coil Nα7A is connected to the wire A of the coil Nα7A in the one-pole, one-phase groove where the next coil A is placed via the interpole connecting wire 3b! flows to f. In other words, the current that enters the wire f of the coil & LA from the V phase is the wire e.
.

It moves step by step to d, C, b, a, and f, circulates between all the wires, and repeats this process.

Similarly, although the arrow is not displayed, the coil Nci is lower than the V phase.
The current flowing into the lA wire at br Op d, e is
Coil Na2A passes through adjacent branches 11, respectively.

3A, further through the inter-electrode connecting wire 3a, the coil Nα6B where the coil B is arranged, and the coil Nα5B through the adjacent branch portions 12.
, 4B, and further flows in order to the wire of the coil Nn 7 A where the next coil A is arranged via the inter-electrode connecting wire 3b. That is, the strands a and b of the coil Na I A.

The currents flowing into c, d, and e flow through coil N where coil B is placed.
α4B respectively a−+ f −+ e−+ d →C−+ bl) −
+ a−+ f −+ 6−+ d −) OC−+
l) 4 a-+f −+ 6-+ dd-+c −+
b 4 B −+ f −+ 6e→f−+a−+b
→ c → d, and this process is repeated each time. In this way, current flows between the same number of strands of strands a"f, no matter which stage of strands are taken, and the current does not flow between the strands of each group, and the effect of the dislocation can be fully absorbed. It can be played well, that is, the strands of each stage move one stage at a time.

By combining the coils A and B whose transposition directions are opposite to each other in the inter-electrode connecting lines 3a and 3b in this manner, the same result as applying one stage of transposition at the inter-electrode connecting portion can be obtained.

According to this embodiment, when the hexagonal coils are assembled into the stator core grooves, it is sufficient to alternately arrange coils with different transposition directions for each number of grooves per pole and one phase, and connect them in order. It can produce the effect of dislocation. In other words, when placing a hexagonal coil in the stator core groove, it is an easy task to check the direction of the current and place the hexagonal coil that matches the current.

In connection work, just connect in the same order as in general connection work. Since the arrangement and connection of the hexagonal coil do not require advanced techniques, anyone can do the work and achieve a sufficient transposition effect.

〔Effect of the invention〕

As described above, in the present invention, even when the number of one-pole one-phase grooves is less than the number of strands of strands, the transposition can be easily and satisfactorily achieved. Therefore, it is possible to obtain a method for connecting a multi-wound tortoise-shell stator coil, which makes it possible to easily and sufficiently perform dislocation even in cases where the stator coil is wound in a hexagonal manner.

[Brief explanation of drawings]

FIG. 1 is a side view showing adjacent branches of transposition applied to the bottom coil outlet according to an embodiment of the multi-wound hexagonal stator coil connection method of the present invention, and FIG. A side view showing the adjacent branches of the dislocation applied to the exit part, Figure 3 is a vertical side view of the multi-wound hexagonal stator coil housed in the stator core groove, and Figure 4 is the same as above. FIG. 5 is a side view of FIG. 4, FIG. 6 is a top view of the bottom electrode connection, and FIG. 7 is a side view of FIG. 6. FIG. 8 is a front view of a multi-wound tortoise-shell stator coil that is also transposed at the bottom coil outlet, FIG. 9 is a bottom view of the one shown in FIG. 8,
Fig. 10 is a side view of Fig. 8, Fig. 11 is an enlarged side view of the P frame part of Fig. 8, and Fig. 12 is a multi-wound hexagonal stator coil with transposition at the upper coil outlet. Front view, Fig. 13 is a bottom view of Fig. 12, Fig. 14 is a side view of Fig. 12, Fig. 15 is an enlarged side view of the Q frame part of Fig. 12, and Fig. 16 is the same three-phase fixing. 3-phase wiring diagram of the child winding, Fig. 17 is an explanatory diagram showing the V-phase wiring of the stator winding, which is also 3-phase, Fig. 18 is a side view showing details of the head of Fig. 10, Fig. 19 is the 14th
FIG. 20 is a side view showing details of the head shown in the figure, and FIG. 20 is an explanatory view showing the moving state of the strands in each stage. 1... Stator core groove, 2... Multi-wound hexagonal stator coil, 3a, 3b... Connection wire between poles, 4... 3-phase stator winding, 5... Bottom coil Eye opening, 6... Upper coil outlet, 7... Upper coil, 8... Bottom coil, 9, 1
0...Dislocation part, 11.12...Adjacent branch part, A...
・Coil with transposition applied to the bottom coil outlet, B... Coil with transposition applied to the top coil outlet, a = f... Plain wire. Figure 13 S'1 g/4$ Figure 15 Figure 76

Claims (1)

[Claims] 1. The winding of a winding unit consisting of a plurality of multi-wound hexagonal stator coils having multiple stages of strands and arranged and formed in order in each pole and one phase groove of the stator core groove. In a method for connecting a multi-wound hexagonal stator coil in which units are connected by pole-to-pole connecting wires to form a three-phase stator winding, the winding units within the one-pole and one-phase groove are fixed in the hexagonal shape. One is formed by transposing the lower strand of the bottom coil outlet of the child coil to the upper stage and connecting it to the strands of the upper coil outlet of the adjacent coil, and the other is the upper coil outlet of the hexagonal stator coil. The winding units with different transposition directions are arranged alternately in order. A method of wiring a multi-wound tortoise-shell stator coil characterized by the following characteristics: