JPH0452975Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a winding for induction equipment constructed by winding a strip conductor.

(Prior art) In recent years, this type of winding has been widely used in transformers, etc., but it has the disadvantage that it requires a large number of turns, and if the conductor is made thin, the space factor of the conductor decreases. . Therefore, in order to deal with this, for example,
As shown in No. 56-174826, a configuration has been considered in which the winding is axially divided into two unit coils and the unit coils are connected in series. According to this, the strip conductor can be made sufficiently thick to ensure the required number of turns, and the space factor of the conductor can be improved.

When the above configuration is adopted, two methods can be considered for connecting each unit coil in series. One is
In the device shown in FIG. 4, the first and second unit coils 1 and 2 are both wound by an integral number of turns, that is, the winding start end and winding end of each unit coil are at the same position in the circumferential direction. The strip conductor is wound in this manner, and the unit coils 1 and 2 are arranged such that their winding start ends and winding ends are located one above the other. In this configuration, an outlet conductor 1b provided at the winding end located on the outer circumference side of the first unit coil 1, and an outlet conductor 2a provided at the winding start end located on the inner circumference side of the second unit coil 2. are connected at a connecting portion 3, and both unit coils 1 and 2 are connected in series. However, in the above configuration, all the lead-out parts are provided in one place, so the work for series connection at the connection part 3 is performed by using the lead-out conductor 1a provided at the winding start end of the unit coil 1 and the unit coil. The lead conductor 2b provided at the end of the winding 2 becomes an obstacle, making the work considerably difficult.For example, when connecting between phases, the connecting portion 3 becomes an obstacle, making the work difficult as well. Furthermore, when such a winding is used as the secondary winding of a transformer and the primary winding is wound around its outer circumference, each lead conductor is concentrated in one place, so the primary winding becomes uneven. There is also the problem of poor balance.

Another method is shown in FIG.
Each of the first and second unit coils 1 and 2 is wound by an integral number of turns and a half turn.
A configuration in which the winding start end and the winding end of the first unit coil 1 are provided so that they are offset from each other by approximately half a turn, and the winding end of the first unit coil 1 and the winding start end of the second unit coil 2 are led out in the same direction. It is. According to this, as shown in the figure, the lead conductor 1b provided at the winding end of the first unit coil 1 and the lead conductor 2a provided at the winding start end of the second unit coil 2 are located on the left side in the figure. The lead conductor 1a provided at the winding start end of the first unit coil 1 and the lead conductor 2b provided at the winding end of the second unit coil 2 are located on the right side in the figure. It turns out. Therefore, the total of four lead-out conductors are distributed to two on the left and two on the left, so
Series connection work and phase-to-phase connection work are greatly facilitated, and even when the primary winding is wound around the outer periphery, there is no risk of eccentricity of the primary winding.

However, in the above configuration, since the winding start end and winding end of each unit coil 1, 2 are shifted from each other by approximately half a turn, the winding forms of each unit coil 1, 2 are different from each other. To clarify this, cross-sectional forms of the first and second unit coils 1 and 2 are shown in FIGS. 6A and 6B. As is clear from the comparison of both figures, the first unit coil 1
Gaps a and b in which no strip conductor is present are created in the area of a half turn on the outer circumference side of the second unit coil 2 and a half turn on the inner circumference side of the second unit coil 2 . Therefore, if each unit coil 1, 2 is wound in this manner, since the inter-turn insulator 4 of each unit coil 1, 2 is common to both, due to the gaps a, b, There is a possibility that a difference in level occurs between the unit coils 1 and 2, which may cause cracks or other problems, resulting in dielectric breakdown. To deal with this, conventionally, as shown in FIG. 7, an insulating filler 5 such as a press board was inserted into each of the gaps a and b. However, such insulating filling 5
It is necessary to firmly fix the device by gluing or tying it, so that it does not fall off or deform due to shocks during transportation, vibrations during operation, or strong electromagnetic force during short circuits. Since the insulating filling 5 is generally a poor conductor of heat, the cooling medium flowing inside and outside the windings is thermally isolated from the windings. There is a problem that the cooling performance of the

Furthermore, in the case where the winding is constructed from two unit coils as described above, consideration must be given to surge voltage as follows. That is, in this type of winding, it is unavoidable that the surge impedance at the series connection between each unit coil 1 and 2 becomes discontinuous, so as shown in FIG. 8, one end is grounded and the other end is connected. When an impulse voltage is applied to
The first unit coil 1 may share substantially all the voltage. In this case, each unit coil 1,
Approximately twice as much stress is applied to the inter-turn insulator as compared to the case where the voltage is shared equally between the turns, so it is necessary to make the inter-turn insulator thick enough to withstand this stress. The rate and cooling performance are further reduced.

(Problems to be solved by the invention) As mentioned above, in the conventional structure in which the winding is composed of a pair of unit coils and these are connected in series in order to increase the space factor of the conductor, the connection If the lead conductors are provided in a distributed manner to avoid operational difficulties, the winding configuration of each unit coil will be different, so it is necessary to provide insulating padding in each unit coil, which worsens manufacturing workability. There is a problem that the cooling performance of the winding is reduced.
Furthermore, a common problem with this type of coil is that it is necessary to take insulation considerations such as thickening the inter-turn insulation against surge voltages, making it impossible to sufficiently improve the space factor and cooling performance. Ta.

The present invention was developed in view of the above circumstances, and its purpose is not only to increase the space factor of the conductor, but also to provide excellent connection workability.
It is an object of the present invention to provide a winding wire for an induction device that can improve manufacturing workability, insulation properties, and cooling properties.

[Structure of the invention] (Means for solving the problem) The winding for an induction device of the invention has a connecting part connecting the first and second unit coils in series with the winding of the first unit coil. The lead-out conductors provided at the starting end and the winding end of the second unit coil are located on the opposite side, and the winding end and the second unit coil are arranged at the outermost periphery of the first unit coil. A dummy conductor on the outer circumferential side of approximately half a turn is provided between the winding end position of the second unit coil, and is connected to the lead-out conductor provided at the winding end of the second unit coil, and the innermost circumferential part of the second unit coil is The feature is that an inner dummy conductor is provided between the winding start end and the winding start position of the first unit coil, and this is connected to the lead conductor provided at the winding start end of the first unit coil. It has the following.

(Function) Since each of the first and second unit coils is provided with dummy conductors on the outer circumferential side and the inner circumferential side, the shapes of both unit coils are substantially the same. As a result, it is possible to prevent steps from forming in the inter-turn insulator common to each unit coil, eliminating dielectric breakdown caused by cracks in the inter-turn insulator, and since the dummy conductor has excellent thermal conductivity, the unit coil Excellent heat dissipation is also ensured. In addition, since each dummy conductor is connected to a predetermined lead-out conductor, a capacitor is connected in parallel with each unit coil, which improves the degree of transient coupling of each unit coil and increases the degree of impulse voltage sharing for each unit. Equalized with respect to the coil.

(Example) The following is an example of the present invention shown in Figures 1 to 3.
This will be explained with reference to the figures.

First, in Figure 2 showing the overall configuration, 10
1 is a winding frame, and 11 and 12 are first and second unit coils wound above and below the winding frame 10. Each unit coil 11, 12 is formed by winding a strip conductor 13 together with a common inter-turn insulator 14, and by winding it an integral number of times and approximately half a turn, the winding start end of each unit coil 11, 12 is The end of the winding is shifted by approximately half a turn. and,
Lead conductors 11a, 11b, 12a, 1 are provided at the winding start end and winding end of each unit coil 11, 12, respectively.
2b are connected by welding or the like, and as shown in FIG. The lead conductor 12b is the lead conductor 11b provided at the winding end of the first unit coil 11 and the second unit coil 12 on the right side of the figure.
The lead conductor 12a provided at the winding start end is located on the left side in the figure. Also, the second
The lead conductor 12a provided at the winding start end of the unit coil 12 projects upward through the inner circumference of the first unit coil 11, and the lead conductor 11b provided at the winding end of the first unit coil 11. is bent from the outer circumferential side toward the inner circumferential side at the upper surface of the unit coil 11, and above the first unit coil 11, the lead conductor 12a and the lead conductor 11b are connected by welding, silver brazing, etc. Connection part 1
5, and both unit coils 11 and 12 are connected in series by a connecting portion 15. Reference numeral 16 denotes an outer periphery side dummy conductor provided for half a turn on the outer periphery of the first unit coil 11.
The outer periphery of the first unit coil 11 of the lead conductor 12b, which is formed by cutting the same strip conductor that constitutes the coils 1 and 12 to a predetermined length, and is provided at the end of the winding of the second unit coil 12. It is connected to the extended part by welding, etc. Reference numeral 17 denotes an inner circumference side dummy conductor provided in a half turn on the inner circumference side of the second unit coil 12, which is also formed by cutting a strip conductor to a predetermined length, and is connected to the first unit coil 11. It is connected by welding or the like to a portion of the lead conductor 11a provided at the starting end of the winding that extends toward the inner circumferential side of the second unit coil 12.

With the above configuration, the following effects can be obtained.

(1) Connecting portion 15 connecting the first and second unit coils 11, 12 in series and lead conductors 11a, 1
Since it is located on the opposite side from 2b by half a turn, sufficient space can be secured around the connecting portion 15 and around the lead conductors 11a and 12b, respectively. Therefore, both the series connection work and the interphase connection work of the unit coils 11 and 12 can be easily performed, and productivity is improved.

(2) Outer dummy conductor 1 on first unit coil 11
6 and also provided the inner dummy conductor 17 on the second unit coil 12, as shown in FIGS. 1A and B, each unit coil 11, 12
have substantially the same cross-sectional shape, and as a result, both unit coils 11 and 12 of the inter-turn insulator 14
It is possible to prevent a difference in level from occurring at the boundary between the two, which in turn can prevent cracks from forming in the difference in level, resulting in dielectric breakdown.

(3) Each dummy conductor 16, 17 on the outer circumferential side and inner circumferential side
Since it is connected to the lead conductors 11a and 12b, it is structurally stronger, and is more reliable against vibration during operation or electromagnetic force during short circuits than the conventional structure in which insulating filling is arranged by gluing or tying. will improve.

(4) Both dummy conductors 16 and 17 on the outer and inner circumference sides
Since it is a good conductor of heat, it can effectively transfer the heat generated in the strip conductor to a cooling medium such as air or insulating oil, and has better cooling performance than the conventional structure with an insulating filler, which is a poor conductor of heat. improves.

(5) Each dummy conductor 16, 17 on the outer circumferential side and inner circumferential side
are electrically connected to the lead conductors 12b and 11a, so if viewed equivalently, the third
As shown in the figure, a capacitance C ₁ is inserted between the half-turn portion near the end of the winding of the first unit coil 11 and the end of the winding of the second unit coil 12 by the outer dummy conductor 16. , a capacitance C ₂ is inserted between the half-turn portion near the winding start end of the second unit coil 12 and the winding start end of the first unit coil 11 by the inner circumference side dummy conductor 17. . Therefore, the transient coupling of each unit coil 11, 12 is improved by the capacitances C ₁ and C ₂ , so when one end is grounded and an impulse voltage is applied to the other end due to a lightning strike, etc. In addition, each unit coil 11 and 12 will share the voltage almost equally. Therefore, if sufficient consideration is given to the insulation between each dummy conductor 16, 17 and each unit coil 11, 12, the inter-turn insulator 1
4 does not need to be made thick over the entire winding, and the space factor and cooling performance can be improved accordingly.

In addition, in the above embodiment, each dummy conductor 16, 17
Since it is made of the same strip conductor that constitutes the unit coils 11 and 12, the material can be prepared by simply cutting the strip conductor.
The present invention is not limited to this, and it goes without saying that each dummy conductor may be formed of a dedicated conductive material. In addition, in the above embodiment, a pair of stage coils 1
1 and 12, but the present invention can be implemented with various modifications without departing from the gist, such as the winding may be constructed from two or more pairs of unit coils. It is possible.

[Effects of the invention] As described above, the present invention winds each unit coil so that the winding start end and the winding end end are shifted from each other by approximately half a turn, and the connecting part and lead-out of both coils are The characteristics are that the first and second unit coils are provided with dummy conductors on the outer circumferential side and the inner circumferential side, respectively. In addition to simplifying the connection work for unit coils,
This has excellent effects in that dielectric breakdown of the inter-turn insulator can be prevented, and cooling performance, space factor, and impact voltage resistance can all be improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, and FIGS. 1A and 3B are section lines A--
A cross-sectional view taken along lines A and B-B, FIG. 2 is an overall perspective view, FIG. 3 is an equivalent circuit diagram, FIG. 4 is a side view of a conventional example, and FIG. 5 is a different conventional example. side view; FIGS. 6A and B are cross-sectional views taken along cutting lines AA and BB in FIG. 5;
FIG. 7 is a longitudinal sectional view of the conventional example shown in FIG. 5, and FIG. 8 is an equivalent circuit diagram of the conventional example. In the drawing, 11 is the first unit coil, 12 is the second unit coil.
unit coil, 13 is a strip conductor, 14 is an inter-turn insulator, 15 is a connection part, 16 is a dummy conductor on the outer peripheral side,
17 is an inner dummy conductor.

Claims (1)

[Scope of utility model registration request] It consists of first and second unit coils arranged along the axial direction and connected to each other in series, each unit coil being wound around a strip conductor with a common inter-turn insulator for each unit coil. a connecting portion that connects the winding end of the first unit coil and the winding start end of the second unit coil; The outermost peripheral part of the first unit coil, in which the lead conductors provided at the winding start end of the first unit coil and the winding end of the second unit coil are located on the opposite side. A dummy conductor on the outer peripheral side of approximately half a turn is provided between the winding end of the winding end and the winding end position of the second unit coil, and connected to the lead-out conductor provided at the winding end of the second unit coil. An inner dummy conductor is provided at the innermost circumferential portion of the second unit coil between the winding start end of the second unit coil and the winding start position of the first unit coil. A winding for induction equipment, characterized in that it is connected to a lead-out conductor provided in the winding.