JPS62196032A - Armature winding of rotary electric machine - Google Patents

Abstract

PURPOSE:To facilitate the jointing work by drawing each strand of upper and bottom conductors facing in upward and downward directions to the circumferential space between the adjacent conductor in the circumferential direction and the strand and by jointing each strand with strand. CONSTITUTION:In composition an upper conductor 8 is shaped with insulated strands 8a-8x bundled on the outside circumference and covered with a conductor insulating layer 10 on the utmost outside circumference. Each strand of this upper conductor 8 is circumferentially drawn to the space between the strand and the adjacent conductor mutually in the circumferential direction and the strands 8a and 8b of the upper conductor 8 are arranged face to face with strands 9a and 9b of a bottom conductor 9. This mutually facing portion is placed in order almost in a straight line against the axial direction of both conductors. After the insulating layer on the outside circumference is removed, it is jointed with joining members 11a and 11b, making up jointed portions 12a and 12b respectively. After these jointed portions are made up, a protective insulating frame 13 is provided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary core armature winding in a rotating electric machine such as a turbine generator, and particularly relates to a wire transposition connection at an axial end of the armature winding. Regarding the department.

[Prior art]

In large-capacity rotating machines such as turbine generators, a large number of winding grooves extending in the axial direction are cut in the inner periphery of the J# fixed iron core, and multiple strands of wire constituting the armature winding are inserted into these grooves. Conductors are housed therein, and these multiple strand conductors are electrically connected to each other at both ends protruding outside the winding groove.

When an alternating current flows through a multi-winding conductor with this configuration,
The amount of leakage magnetic flux that crosses the winding groove in the circumferential direction induces a voltage between the strands in each longitudinal portion of the conductor. If a very large difference occurs in the induced voltage between the cable wires, a rough circulating direct current flows through the closed-loop pair of wires, increasing losses and increasing the heat generated inside the conductor.

Therefore, in order to make the voltage induced between the wires almost equal over the entire length of the conductor and to prevent circulating current from flowing,
Each strand of a conductor is transposed by various methods.

This dislocation is achieved by sequentially changing the position of each strand within the conductor, but considering that a certain strand moves in a circle around the center of the cross section in the conductor M, the degree of dislocation is determined by the angle of rotation. can be expressed. For example, a dislocation in which each strand passes through all positions in the cross section of the conductor and ends up at the same position as the starting position at the opposite end of the groove is generally referred to as 360 dislocation.

In a normal generator, all the wire ends of each armature conductor are shorted together (short-circuited), and there is leakage flux at the ends of the generator, so to reduce losses, it is necessary to The position of the wire at both ends of the wire can be precisely reversed, the directions of the voltages induced at both ends of the wire should be reversed, and these can be canceled out.

First, metastasis will be explained using FIGS. 8 and 9. This figure has been subjected to the commonly known label transposition.
An example of Ed conductor l is shown, and the dislocation angle is 540
degree, or one and a half revolutions.

The conductor 1 includes a straight groove conductor portion 2 made of twisted wires installed in the winding groove of a rotating electric machine, and a complicated curve in the circumferential direction and radial direction at both ends of the groove conductor portion 2. 6 elements in each row, a total of 12 elements Ra.
It consists of two columns 5.6 containing -, e.

The transposition is carried out by repeatedly bending the wire from one row 6 to the other row 5 at the top, and by repeatedly bending the wire from row 5 to row 6 at the bottom, contrary to the top. Note that the dislocation location of each strand a = l is designated by the code a-1 of the strand.

The dislocation pitch P1 near both ends of the groove conductor portion 2 is selected to be approximately half the dislocation pitch P2 near the center. By setting such a dislocation pitch, the inductance of each strand within the groove can be made almost equal.

However, even if wire transposition is performed in this manner, the wire current does not necessarily become uniform. There are various causes for this, but one of them is the influence of the magnetic flux distribution at Hatton Isobataja. ′) Mari strand pair a.

l is located on the top side of the conductor at one end 3 of the multi-strand conductor, but on the bottom side at the other end 4. As described above, the wire pairs are at different positions within the conductor, and the magnetic flux distribution at the ends is very complicated, so the amount of magnetic flux interlinking with the wire pairs at each end is not necessarily equal. Therefore, a difference occurs in the voltage induced between the strands, and a current corresponding to the difference in the induced voltage at each end flows.

[Problem that the invention seeks to solve]

As described above, in the conventional transposition method, each strand is simply short-circuited at the end of a multi-strand conductor, and therefore the dislocation state of the strands cannot be changed. Therefore, it is difficult to make the strand current uniform, and in some cases, a large circulating direct current may flow, causing local overheating inside the conductor, or in the worst case, the insulation rupture of the strand conductor may be damaged, causing a short circuit between the strands. There was a risk of causing such problems.

On the other hand, a configuration in which arbitrary strands are connected and transposed at the end of a multi-strand conductor is proposed, for example, in
It is proposed by No. 3816 Busyyo.

However, this configuration consists of a plurality of thin conductor plates extending in the coaxial direction at the ends of the multi-strand conductor and each having a hole through which each strand is passed, and a conductor plate having the holes extending between predetermined transposed strands. When connecting the conductor plate and the wire, the wire is covered with a sleeve, excluding the insulating part, and the periphery of the hole in the conductor plate is used for the connection. Because the gaps between the wires were small, it was difficult to form holes in the conductor plate for inserting the sleeves. It is also possible to solve the above problem by cutting the part of the wire that corresponds to the hole, but @
Since it is manufactured as a long wire, errors tend to occur in the axial direction, and it is difficult to match the cut portion of the wire to the hole.

An object of the present invention is to provide an A-mode winding for a rotating electric machine, which allows easy connection between transposed wires, reduces circulating current between the wires, and reduces loss.

[Failure to solve the problem]

In order to achieve the above object, the present invention draws out a plurality of dislocated pairs of strands at the ends of a multiple strand conductor into the circumferential space between adjacent multiple strand conductors, and connects the opposing strands. It is characterized by being connected.

[Effect]

Since the present invention has the above-described configuration, it is possible to connect the transposed strands using the circumferential space of the multiple cable conductor, instead of the narrow connection work using the gap between the conventional tapped strands. First, the connection can be easily performed in a relatively large circumferential space, and the above-mentioned connection can reduce the circulation flow between the strands and reduce the loss.

〔Example〕

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

Usually from a turbine! In Iso, a plurality of multiple strand conductors are housed in one slot, and in the following explanation, the one that is closer to the gap between adjacent multiple strand conductors in the vertical direction will be referred to as the upper conductor, and the gap will be referred to as the upper conductor. The one farthest from is called the bottom conductor.

As shown in FIG.
g, and is thrown over the axial ends of the top conductor 8 and bottom conductor 9 that are vertically adjacent to each other.

FIG. 81 is a partially sectional perspective view showing the transposed connection portion 7 having a 45-degree transposition configuration. The upper conductor 8 is constructed by bundling strands 8a, 8b, . Each strand in the upper conductor 8 is drawn out in the circumferential direction into a space between adjacent conductors (not shown) in the circumferential direction,
The strands 8a of the top conductor 8 are arranged opposite to the strands 9a of the bottom conductor 9. Similarly, the strands 8b of the top conductor 8 are drawn out in the circumferential direction so as to face the strands 9b of the bottom conductor 9.

In this way, the strands constituting the upper conductor 8 and the strands constituting the bottom conductor 9 are matched to each other based on the required dislocations. These mutually opposed parts are arranged substantially in a straight line with respect to the axial direction of the side conductor, and after removing the insulating layer applied to the outer periphery of the strands, they are joined via the joining members 11a and 11b, and the joined part 12a and 12b. After configuring this joint, a protective insulating frame 13 is provided to commonly protect the side conductors 8 and 9 and to insulate between conductors adjacent in the circumferential direction. It is filled with a hardening insulating material to maintain electrical insulation and mechanical properties.

The above-mentioned joint portions 12a and 12b are substantially aligned in the axial direction of the side conductor 8.9. Therefore, when the joining parts 11a and Ilb, such as silver solder, are heated and melted, it can be done simultaneously with a simple jig. That is, as shown in FIG.
b are formed alternately, and the conductive plate 21 also has a plurality of protrusions 21a and a plurality of recesses 21b alternately formed. Inside the pair of recesses 20b and 21b, the wires 8 a and 9 fi forming the above-mentioned joint part and the joining member 11 a are placed.
a pair of protrusions 20a, so that pressure can be applied to the joint by applying a pressure P4 to the plate;
A gap 23 is formed between 21a. Conductive plate 20
A high-frequency induction coil 22 is wound around the high-frequency magnetic field, and the joining member 11a can be heated by the high-frequency magnetic field. By housing each joint in each pair of recesses and exciting the high-frequency induction coil 22 while applying pressure P, the joining members of each joint can be melted and pixel lines can be joined at once.

As mentioned above, in this embodiment, at the ends of the side conductors 8 and 9, each selected pair of CIA+W is pulled out into the circumferential space between the circumferentially adjacent conductors, and each joint is Since the power is distributed almost linearly, it can be joined at once using a simple jig, and the desired dislocation can be easily created, reducing the circulation and current between the strands and reducing the loss generated. The armature winding is obtained.

FIG. 4 is a cross-sectional view of a side conductor 8°9 according to another embodiment of the present invention, in which a 15V transition is made between the strands, and only four joints will be described below.

The upper conductor 8's: It reaches the junction $ 12 x through the gap between the low conductors 90, and at the junction 12x, the low conductor strand 9 drawn out into the circumferential space
It is joined together with x. In this way, the strand 8x at the top on the left side of the upper four strands 8 is transposed to the strand 9x at the top on the right side of the low conductor 9.

In addition, the strand 8a on the right side of the upper conductor 8 is pulled out to the circumferential space on the right side, and as can be seen from FIG. 5, which is a side view of FIG. 12aiC
Finally, it is joined together with the cable wire 9a drawn out from the second from the top on the right side of the low conductor 9 to the local inner space +iJj on the right side in FIG. Furthermore, the strand 8w located at the second position from the top on the left side of the upper conductor 8 is pulled out to the left circumferential space, and is located at the top stage on the left side of the low conductor 9 and is drawn out to the left circumferential space. The strands 9w drawn out form a joint 12w. on the other hand,
The strand 81 located at the lowermost stage on the right side of the upper conductor 8 is drawn out to the right circumferential space, passes between the conductors 8 and 9, reaches the left circumferential space, and is thus connected to the left side of the conductor 9. When each strand performs a predetermined dislocation, the rain space in the circumferential direction,
The space between the side conductors 8 and 9 can be utilized to construct each joint in a substantially straight line as shown in FIG. The joining operation of each joining part is carried out by the same method as explained in FIG.

In the above-mentioned two embodiments, the circumferential space of the side conductor 8.9 constitutes a nearly linear flexible joint, but if there are many pairs of strands, for example, they can be divided into arbitrary groups, It is also possible to change the arrangement straight line of the joint part each time. With such a configuration, the welding operation using the jig shown in FIG. 2 can be performed for each group, and the axial length of the jig can be kept from increasing too much. Further, as another embodiment, the joint parts can be constructed by alternately shifting vertically, and the joint parts can be constructed on two straight lines, upper and lower, in one circumferential space.If configured in this way, the upper conductor 8 The bonding area of each wire of the low conductor 9 and the low conductor 9 can be made large on the above-mentioned straight line.

FIG. 6 is a sectional view of side conductors 8 and 9 according to yet another embodiment, in which a 90 degree transposition is performed between the strands of the side conductors.

As shown in Figure 7, each joint is configured in a straight line in the circumferential space, and only the joints of the four strands will be explained using Figure 6, and explanations of other joints will be omitted. do.

First, the junction mtzf will be explained. The strands 8f of the upper conductor 8 and the strands 9f of the lower conductor 9 are both drawn out to the right circumferential space to form a joint 12f. Next, joint part 1
Looking at 2x, the topmost wire 8 on the left side of the upper conductor 8
After X is drawn out to the left circumferential space, 1 of the upper conductor 8
The 1111 part reaches the lower part, passes between the side conductors 8 and 9, and is drawn out to the right circumferential space, and also the element #J9x of the low conductor 9.
is pulled out to the right circumferential space, together with the strand 8a,
A joint portion 12x is formed behind the joint portion 12f.

Regarding the joint 121, the wire 81 is led out from the lowermost stage on the right side of the upper conductor 8, passes between the side conductors 8 and 9, and reaches the circumferential space on the left side. It is joined to the strand 91 led out to the left circumferential space to form a joint portion 121. Further, the strand 8r led out from the middle on the left side of the upper conductor 8 and the strand 9r led out from the uppermost stage on the left side of the lower conductor 9 are both joined in the left circumferential space, and the joined part 121 A junction fi12r is formed behind the.

Even in this 90 degree transposition, the joint parts can be arranged almost linearly in the circumferential space of the side conductors 8 and 90, making the joining work easy.
It is possible to obtain an armature winding in which the circulating current between the strands is reduced and the generated loss is reduced.

In any of these embodiments, since the joints are formed by dividing the circumferential space of the side conductor into two on both sides, the axial length required for each joint is equal to the length of the joint formed on only one side. It is shorter than the example.

In each of the above embodiments, the joints were formed in the circumferential space between the conductors adjacent in the circumferential direction, but each joint was formed in the circumferential space between the conductors adjacent in the vertical direction. It may be formed. In other words, the joint portion may be formed above the upper conductor 8. However, from the viewpoint of the size of the remaining space of the existing configuration, the above-mentioned embodiment is more desirable.

〔Effect of the invention〕

As explained above, in the invention, each strand of the top conductor and bottom conductor that are adjacent to each other in the vertical direction is drawn out into the circumferential space between the adjacent conductors facing the circumferential direction, so that an arbitrary dislocation angle is obtained. Since each strand is joined together, it is possible to perform the joining in a relatively large circumferential space, making the joining process easy, and by setting the dislocation angle to an arbitrary value, the circulating current between the strands can be reduced. Thus, it is possible to obtain a Takaisogo winding for a recirculating machine with reduced loss.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional perspective view showing the end of an armature winding of a rotating electric machine according to an embodiment of the present invention, and FIG. 2 is a jig showing a method of joining the main parts of FIG. 3 is a side view of the end of the armature winding, FIG. 4 is a sectional view showing the end of the armature winding according to another embodiment of the present invention, and FIG. 5 is a side view of the end of the armature winding.
6 is a sectional view showing the end of an armature winding according to still another embodiment of the present invention, FIG. 7 is a side view of FIG. 6, and FIGS. 8 and 9 are conventional FIG. 2 is a front view and a plan view of a transposed conductor. 8... Upper conductor, 8a to 8X... Element wire,
9... Bottom conductor, 9a to 9x... Element wire,
lla, llb...joining member, 12a, 12b
・・・・・・Joint part. Fig. 1/lap l lb--TI'aiP material 12a,
12b - Auxiliary Figure 2 Figure 5 a so 120 Figure 6 Figure 7 so t 9χ

Claims (1)

[Scope of Claims] 1. In an armature winding of a rotating electric machine in which a plurality of at least two multi-strand conductors adjacent in the vertical direction are arranged at a predetermined distance apart in the circumferential direction, The multiple strand conductor is pulled out into a circumferential space between circumferentially adjacent multiple strand conductors, and predetermined strands to be transposed in both of the multiple strand conductors are joined in the circumferential space. Characteristics of armature windings for rotating electrical machines. 2. In the item described in claim 1 above, the joint portion where the predetermined wires to be drawn out into the circumferential space and to be transposed are joined together is linearly arranged side by side in the axial direction of the multi-wire conductor. An armature winding for a rotating electric machine characterized by: 3. In the thing described in claim 1 above, the joint where the predetermined strands to be drawn out into the circumferential space and are to be transposed are joined together in the circumferential direction on both circumferential sides of both the multiple strand conductors. An armature winding for a rotating electrical machine characterized by being formed by drawing it out into separate spaces. 4. In the device described in claim 1 above, the joint where predetermined strands to be drawn out into the circumferential space and to be transposed are joined together includes a plurality of strands along the axial direction of the multi-strand conductor. An armature winding for a rotating electric machine, characterized in that the armature winding is divided into groups, and each group is configured substantially linearly in the axial direction. 5. In the thing described in claim 1 above, the joints where predetermined strands to be drawn out into the circumferential space and to be transposed are joined are alternately shifted in the axial direction of the multi-strand conductor. An armature winding for a rotating electric machine characterized by being formed into two substantially parallel straight lines.