JP2001006950A - Winding for induction electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction electric apparatus winding formed with an insulator that can be molded with a metal die of the lower price than that of the related art. SOLUTION: In this induction electric apparatus winding, the end part of a disc winding 1 in the radial direction is covered in close contact with the internal surface of groove of the U-shape insulator 14 opened in the radial direction, a plurality of U-shape insulators 14 are arranged in the circumferential direction of the disc winding 1 in each insulation spacer 5, and the winding itself is held with the insulation spacer 5 and disc winding 1, and is then projected in the circumferential direction of the disc winding 1 from both sides of the insulation spacer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction winding formed by stacking a plurality of disk windings in an axial direction, and more particularly to an induction winding with a reduced manufacturing cost.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional perspective view of a main part showing a configuration of a conventional induction winding. One side of the induction winding wound around a left vertical axis (not shown) is shown in FIG. It is shown. The two induction motor windings 1C, 2C are formed by stacking a plurality of disk windings 1, 2 in a plurality of stages via insulating spacers 5, 10, respectively.
2C constitutes a primary winding and a secondary winding of the transformer, respectively. Each of the disk windings 1 and 2 is formed by winding conductors which are insulated and covered with each other in the radial direction. The induction coil 1C is wound around a vertical duct piece 4 provided on the outer periphery of the inner insulating tube 3. A vertical duct piece 6 is further provided around the outer circumference of the induction winding 1C, and an insulating cylinder 7 is further provided outside the vertical duct piece 6. Outside the vertical duct piece 6, an insulating cylinder 19 is further arranged via a vertical insulating spacer 8.
A vertical duct piece 9 is provided outside the insulating tube 19, and an induction winding 2 </ b> C is wound around the vertical duct piece 9. A T-shaped groove is formed at a radial end of the insulating spacers 5 and 10, and is perpendicular to the axial direction of the vertical duct pieces 4, 6, and 9 so as to fit into the T-shaped groove. The cross section is formed in a T shape. The insulating spacers 5, 10 are positioned by fitting the T-shaped grooves of the insulating spacers 5, 10 into the vertical duct pieces 4, 6, 9. A plurality of insulating spacers 5 and 10 are arranged in the circumferential direction of the disk windings 1 and 2, and the axial insulation dimensions of the disk windings 1 and 2 are ensured. Induction winding 1C,
2C is housed in a container (not shown) together with insulating oil or SF ₆ gas as an insulating medium.

FIG. 8 is a vertical sectional view taken along the line XX of FIG. As described above, the disk winding 1 is connected to the insulating spacer 5.
Through a plurality of layers. Adjacent disk winding 1
Since impulse voltage or AC voltage is applied between them,
The thickness of the insulating coating of the conductor and the axial dimension of the insulating spacer 5 are determined so that the insulation between the disk windings 1 withstands these voltages.

FIG. 10A is an enlarged sectional view of a portion A in FIG. The corner of the conductor 1A is rounded with a radius R, and the outer periphery of the conductor 1A is coated with an insulating coating 1B. As described above, the insulating spacer 5 is provided along the lower surface of the insulating coating 1B, and the vertical duct piece 6 is provided along the right surface of the insulating coating 1B. The upper and lower portions of both ends in the radial direction of each disk winding 1 in FIG. 8 have the same configuration as that of FIG.

In FIG. 10A, in the case of oil-filled insulation using insulating oil as an insulating medium, kraft paper is used as the material of the insulating coating 1B of the conductor 1A of the disk winding, and the insulating spacer 5 or the like is used. As a material of the vertical duct piece 6, a high-density press board obtained by compression-molding a paper fiber is used. On the other hand, in the case of gas insulation using SF ₆ gas as an insulating medium, polyamide paper is used as the material of the insulating coating 1B of the conductor 1A of the disk winding, and the insulating spacer 5 and the vertical duct piece 6 are used.
A polyamide board is used as a material for the above.

Returning to FIG. 8, the higher the dielectric strength between the disk windings 1, the smaller the overall height of the induction winding. The dielectric strength between the disk windings 1 is determined by the wedge-shaped gap 11 formed between the insulating coating 1B, the insulating spacer 5 and the vertical duct piece 6, as shown in FIG.
Is determined by the electric field applied to That is, the space of the wedge-shaped gap 11 is filled with an insulating medium. The insulating medium is insulating oil in the case of oil-filled insulation, and is SF ₆ gas in the case of gas insulation. Each of these insulating media has a lower dielectric strength than a solid insulating material such as the insulating coating 1B of the conductor 1A and the insulating spacer 5. When a voltage is applied between the disk windings, the applied voltage is applied in series to the insulating portion of the insulating coating 1B, the wedge-shaped gap 11, and the insulating spacer 5 at the radial end of the disk winding. When the insulation medium itself is broken down by the electric field in the wedge-shaped gap 11, the insulation breakdown triggers the breakdown of the entire winding between the disk windings. Therefore, if the electric field in the wedge-shaped gap 11 can be reduced, the dielectric strength between the disk windings can be improved.

FIG. 9 is a sectional view of an essential part showing the configuration of a different conventional induction winding, and corresponds to FIG. L-shaped insulating ring 1 along both radial ends of disc winding 1
2 are arranged. The other components in FIG. 9 are the same as those of the conventional configuration in FIG.

FIG. 10B is an enlarged sectional view of a portion B in FIG. As described above, the L-shaped insulating ring 12 is wound around the outer periphery of the insulating coating 1B of the conductor 1A. FIG.
(B) is otherwise the same as (A) in FIG. L
As the material of the insulating ring 12, a high-density press board is used in the case of oil insulation, and a polyamide board is used in the case of gas insulation, and is press-molded with a mold for forming an L-shape. Note that both ends in the radial direction of each disk winding 1 in FIG. 9 have the same configuration as that in FIG. 10B.

In FIG. 10B, when a voltage is applied between the disk windings, the applied voltage is applied to the insulating coating 1B and the L-shaped insulating ring 12 at the radial end of the disk winding. It covers the insulating portion between the wedge-shaped gap 13 and the insulating spacer 5 in series. When the insulation medium itself is broken down by the electric field in the wedge-shaped gap 13, the insulation breakdown triggers the breakdown between the disk windings, causing the entire path between the disk windings to break down. The electric field in the wedge-shaped gap 13 is shown in FIG.
The electric field in the wedge-shaped gap 11 in FIG. That is, in FIG. 10A, the electric field in the wedge-shaped gap 11 is considerably concentrated by the corner of the radius R of the conductor 1A, but the wedge-shaped gap 13 in FIG. As compared with the case of the gap 11, the L-shaped insulating ring 1 is formed from the corner of the radius R of the conductor 1A.
2 because they are separated by the thickness of 2
The electric field in 3 is lessened than the electric field in the wedge-shaped gap 11. Therefore, the dielectric strength between the disc windings 1 in FIG. 9 is higher than that in the case of FIG. 8, and the entire height of the induction winding can be reduced.

[0010]

However, the conventional induction motor winding as described above has a problem in that the molding cost of the L-shaped insulating ring is high. In other words, since the L-shaped insulating ring is made to rotate around the radial end of the disk winding over the entire circumference, it is necessary to make a molding die each time the inner and outer diameters of the disk winding are different. There was a great deal of expense in making molds. In addition, when a large-capacity induction winding is used, the inner and outer diameters of the disk winding are increased to about 1 m, and the mold for molding is also increased accordingly. For this reason, the manufacturing cost of the L-shaped insulating ring has been increased, which has increased the manufacturing cost of the entire induction winding. SUMMARY OF THE INVENTION An object of the present invention is to provide an induction winding that is formed using an insulator that can be molded with a mold that is less expensive than conventional ones.

[0011]

According to the present invention, in order to achieve the above object, disk windings are stacked in a plurality of stages in the axial direction via insulating spacers, and the insulating spacers are arranged on the disk windings. In the induction winding, which is arranged in the circumferential direction and is radially oriented in the radial direction, the radial end of the disk winding is formed on the inner surface of the groove of the U-shaped insulator opened in the radial direction. The U-shaped insulators are covered in close contact with each other, and a plurality of the U-shaped insulators are arranged in the circumferential direction of the disc winding for each of the insulating spacers, and are sandwiched between the insulating spacers and the disc windings. It is preferable to project from both sides in the circumferential direction of the disk winding. Instead of the conventional L-shaped insulating ring, the above-mentioned U-shaped insulator is used. This U-shaped insulator separates the wedge-shaped gap from the corners of the conductor by the thickness of the U-shaped insulator, so that the dielectric strength between the disk windings uses a conventional L-shaped insulating ring. It improves in the same way as the existing configuration. Moreover, the U-shaped insulator is provided for each insulating spacer, and the circumferential width of the U-shaped insulator may be slightly larger than the circumferential width of the insulating spacer. Therefore, the width of the U-shaped insulator in the circumferential direction may be small, and the molding die may be smaller than before. Also, since the circumferential width of the U-shaped insulator is small, if the inner and outer diameters of the disk winding are as large as about 1 m, the U-shaped insulator may be rounded along the inner and outer circumferences of the disk winding. There is no need to attach. As a result, if the axial length of the conductor including the insulating coating of the disk winding is the same, even if the inner and outer diameters of the disk winding are different, the mold for molding the U-shaped insulator can be shared can do.

[0012] In this configuration, the relative permittivity of the U-shaped insulator may be smaller than that of the insulating spacer. When a voltage is applied between the disk windings, the applied voltage is applied at the radial end of the disk winding to the insulating portion between the insulating coating of the conductor, the U-shaped insulator, the wedge-shaped gap, and the insulating spacer. , Each of which is capacitively divided. Since the relative permittivity of the U-shaped insulator is smaller than that of the insulating spacer, the portion of the U-shaped insulator shares a large voltage. Therefore, the shared voltage of the wedge-shaped gap is reduced, and the electric field in the wedge-shaped gap is reduced. Thereby, the dielectric strength between the disk windings is further improved.

In addition, a plurality of disk windings are stacked in the axial direction via insulating spacers, and a plurality of the insulating spacers are arranged in the circumferential direction of the disk windings and radially directed in the radial direction. In the electric winding, a plurality of insulating plates having a relative permittivity smaller than that of the insulating spacer are arranged in a circumferential direction of the disc winding for each insulating spacer, and the insulating plate is insulated from a radial end of the disc winding. It may be provided between the insulating spacer and both sides of the insulating spacer and project in the circumferential direction of the disk winding. The above-mentioned insulating plate is used in place of the conventional L-shaped insulating ring. When a voltage is applied between the disk windings, at the radial end of the disk winding, the applied voltage is applied in series to the insulating coating of the conductor, the wedge-shaped gap, and the insulating portion between the insulating plate and the insulating spacer. Each of these insulating portions is divided by capacitance. Since the dielectric constant of the insulating plate is smaller than that of the insulating spacer, the portion of the insulating plate shares a large amount of voltage. Therefore, the shared voltage of the wedge-shaped gap is reduced, and the electric field in the wedge-shaped gap is reduced. Thereby, the dielectric strength between the disk windings is improved as in a configuration using a conventional L-shaped insulating ring. In addition, the insulating plate is provided for each insulating spacer, and the circumferential width of the insulating plate may be slightly larger than the circumferential width of the insulating spacer. Therefore, the insulating plate does not require a bending mold. Further, when the inner and outer diameters of the disk winding are as large as about 1 m, it is not necessary to round the side surface of the insulating plate along the inner and outer circumferences of the disk winding, and a rectangular shape is sufficient. This eliminates the need for a mold for molding the insulating plate.

In addition, a plurality of disk windings are stacked in the axial direction via insulating spacers, and a plurality of the insulating spacers are arranged in the circumferential direction of the disk windings and radially directed in the radial direction. In the electric winding, a plurality of U-shaped insulators having a relative dielectric constant smaller than that of the insulating spacer are arranged in the circumferential direction of the disk winding for each insulating spacer, and both sides of the U-shaped insulator are insulating spacers. Is inserted between the radial end of the disk winding and the insulating spacer from the circumferential direction of the disk winding so that both sides of the U-shaped insulator are inserted from the sides of the insulating spacer. May protrude in the circumferential direction. Instead of the conventional L-shaped insulating ring, the above-mentioned U-shaped insulator is used. When a voltage is applied between the disk windings, the applied voltage is applied at the radial end of the disk winding to an insulating portion between the insulating coating of the conductor, the wedge-shaped gap, the U-shaped insulator, and the insulating spacer. , Each of which is capacitively divided. Since the relative permittivity of the U-shaped insulator is smaller than that of the insulating spacer, the portion of the U-shaped insulator shares a large voltage. Therefore, the shared voltage of the wedge-shaped gap is reduced, and the electric field in the wedge-shaped gap is reduced. Thereby, the dielectric strength between the disk windings is improved as in a configuration using a conventional L-shaped insulating ring. The U-shaped insulator is provided for each insulating spacer, and the circumferential width of both sides of the U-shaped insulator may be slightly larger than the circumferential width of the insulating spacer. Therefore, the width of the U-shaped insulator in the circumferential direction can be small, and the molding die can be smaller than the conventional one. Also,
Since the circumferential width of the U-shaped insulator is small, if the inner and outer diameters of the disk winding are as large as about 1 m, the U-shaped insulator is rounded along the inner and outer circumferences of the disk winding. Eliminates the need.
As a result, if the insulating spacers have the same axial length,
Even when the inner and outer diameters of the disk winding are different, a mold for forming the U-shaped insulator can be shared.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a sectional view of a main part showing a configuration of an induction winding according to an embodiment of the present invention, and corresponds to FIG. Both ends in the radial direction of the disc winding 1 are covered so as to be in close contact with the inner surface of the groove of the U-shaped insulator 14 opened in the radial direction.

FIG. 2 is a view taken in the direction of the arrow P in FIG. 1 and shows a main part of the circular disk winding 1. U-shaped insulator 14
Are arranged in the circumferential direction of the disk winding 1 for each insulating spacer 5 and are sandwiched between the insulating spacer 5 and the disk winding 1.
The U-shaped insulator 14 protrudes from both sides of the circumferential width D of the insulating spacer 5 by a width T in the circumferential direction. Figure 1
The rest of FIG. 2 is the same as the conventional configuration, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In FIG. 1, a U-shaped insulator 14 replaces the conventional L-shaped insulating ring 12 of FIG. That is, the enlarged cross-sectional view of the portion C in FIG. 1 has a configuration in which the L-shaped insulating ring 12 is replaced with a U-shaped insulator 14 in FIG. 10B described above. Therefore, since the U-shaped insulator 14 separates the wedge-shaped gap 13 from the corner of the radius R of the conductor 1A by the thickness of the U-shaped insulator 14, the dielectric strength between the disk windings 1 is increased. Is improved similarly to the configuration using the conventional L-shaped insulating ring.

In FIG. 2, the circumferential width D of the insulating spacer 5 is about 20 to 30 mm, but the circumferential width of the U-shaped insulator 14 is about 30 to 40 mm if the width T is, for example, 5 mm. Good. Conventional L-shaped insulation ring
Although it was as large as about 1 m in accordance with the inner and outer diameters of the disc winding 1, the circumferential width of the U-shaped insulator 14 was smaller than that of the L-shaped insulating ring. Molds can be very small. Also, the U-shaped insulator 14
It is not necessary to round the inner and outer circumferences of the disk winding 1. Thereby, when the axial length of the conductor including the insulating coating of the disc winding 1 is the same, even if the inner and outer diameters of the disc winding 1 are different, a mold for molding the U-shaped insulator 14 is provided. Can be used in common, and the U-shaped insulator 14 can be manufactured at a lower cost than before.

Also, the U-shaped insulator 14 and the insulating spacer 5 of FIG. 1 may be made of the same material. For example, in the case of oil-filled insulation, both are made of a high-density press board, In the case of insulation, a polyamide board may be used. However, by making the relative permittivity of the U-shaped insulator 14 smaller than that of the insulating spacer 5, the dielectric strength between the disc windings 1 can be further improved. The relative permittivity of the high-density press board is 4.6, and the relative permittivity of the polyamide board is 3.0. If the U-shaped insulator 14 in the case of oil insulation is made of, for example, polytetrafluoroethylene, the relative dielectric constant is 2.0, which is lower than the relative dielectric constant of a high-density press board. On the other hand, if the U-shaped insulator 14 in the case of gas insulation is made of, for example, polypropylene, the relative permittivity is 2.2, which is smaller than the relative permittivity of the polyamide board. In FIG. 10B, when a voltage is applied between the disk windings in a configuration in which the L-shaped insulating ring 12 is replaced with a U-shaped insulator 14, at the radial end of the disk winding, An applied voltage is applied in series to the insulating portion 1B of the conductor 1A, the U-shaped insulator 14, the wedge-shaped gap 13, and the insulating portion of the insulating spacer 5, and each of the insulating portions is subjected to capacitive voltage division. If the relative permittivity of the U-shaped insulator 14 is smaller than that of the insulating spacer 5, the portion of the U-shaped insulator 14 shares more voltage than when the relative permittivity is the same as that of the insulating spacer 5. Become like Therefore, the shared voltage of the wedge-shaped gap 13 is reduced, and the electric field in the wedge-shaped gap 13 is further reduced. Thereby, the dielectric strength between the disk windings is further improved, and the height of the entire induction winding can be reduced. The reason why the U-shaped insulator 14 is projected from both sides of the circumferential width D of the insulating spacer 5 by the width T in the circumferential direction is that the electric field in the wedge-shaped gap 13 on the circumferential side surface of the insulating spacer 5 This is to prevent distraction and concentration.

In the above-described embodiment, the U-shaped insulator 14 is projected from both sides of the circumferential width D of the insulating spacer 5 by T in the circumferential direction. However, both have the same circumferential width. In this case, the end faces in the circumferential direction may be flush with each other, and it is sufficient that no wedge-shaped gap is formed in the circumferential direction. In consideration of the case where the discharge progresses from the circumferential side surface, it is more preferable that the U-shaped insulator 14 protrude in the circumferential direction since the protruding portion functions as a discharge barrier.

FIG. 3 is a sectional view of a principal part showing a configuration of an induction winding according to a different embodiment of the present invention, and corresponds to FIG. An insulating plate 15 having a smaller relative permittivity than the insulating spacer 5 is interposed between the radial end of the disk winding 1 and the insulating spacer 5.

FIG. 4 is a view taken in the direction of the arrow Q in FIG. 3, and shows a main part of the circular disk winding 1. A plurality of insulating plates 15 are arranged in the circumferential direction of the disk winding 1 for each of the insulating spacers 5 and protrude by a width T from both sides of the circumferential width D of the insulating spacer 5 in the circumferential direction. The rest of FIGS. 3 and 4 is the same as the configuration of FIGS. 1 and 2, respectively.

In FIG. 3, for example, when the material of the insulating spacer 5 is a high-density press board for oil-filled insulation and a polyamide board for gas insulation, the insulating plate 15 is made of polytetrafluoroethylene for oil-filled insulation. In gas insulation, by using polypropylene, the relative permittivity of the insulating plate 15 becomes smaller than that of the insulating spacer 5.

FIG. 11 is an enlarged sectional view of a portion D in FIG.
An insulating spacer 5 extends along the lower surface of the insulating coating 1B of the conductor 1A via an insulating plate 15, and a vertical duct piece 6 extends along the right surface of the insulating coating 1B. The upper and lower ends of both ends in the radial direction of each disk winding 1 in FIG.
This is the same configuration as in FIG. In FIG. 11, when a voltage is applied between the disk windings, the applied voltage at the radial end of the disk winding is changed to the insulating coating 1B of the conductor 1A, the wedge-shaped gap 17, the insulating plate 15, the insulating spacer 5, Are applied in series to each other, and each of the insulating portions is divided by capacitance. If the relative permittivity of the insulating plate 15 is made smaller than that of the insulating spacer 5, the insulating plate 15 will share more voltage. For this purpose, the shared voltage of the wedge-shaped gap 17 is changed as shown in FIG.
And the electric field in the wedge-shaped gap 17 is reduced. Thereby, the dielectric strength between the disk windings is further improved. That is, the insulating plate 15 replaces the conventional L-shaped insulating ring 12 of FIG. The reason why the insulating plate 15 is protruded in the circumferential direction from both sides of the circumferential width D of the insulating spacer 5 by the width T in the same manner as in FIG. This is to prevent the electric field from being disturbed and concentrated.

In FIG. 4, the circumferential width D of the insulating spacer 5 is about 20 to 30 mm as described above, but the circumferential width of the insulating plate 15 is 3 if the width T is, for example, 5 mm.
It may be about 0 to 40 mm. The insulating plate 15 is made of a conventional L
There is no need for a bending mold as in the case of a shaped insulating ring. Further, when the inner and outer diameters of the disk winding are as large as about 1 m, it is not necessary to round the side surface of the insulating plate 15 along the inner and outer circumferences of the disk winding 1, and a rectangular shape is sufficient. Thus, even when the inner and outer diameters of the disk winding 1 are different, the insulating plate 15 can be shared, and the insulating plate 15 can be manufactured at lower cost than before.

FIG. 5 is a cross-sectional view of a main part showing a configuration of an induction winding according to still another embodiment of the present invention, and is a view corresponding to FIG. The two sides of the U-shaped insulator 16 having a lower relative dielectric constant than the insulating spacer 5 are sandwiched between the insulating spacers 5 so that the disk winding 1
Is inserted between the radial end portion of the base member and the insulating spacer 5.

FIG. 6 is a view taken in the direction of the arrow R in FIG. 5, and shows the main part of the circular disk winding 1. U-shaped insulator 16
Are arranged in the circumferential direction of the disk winding 1 for each insulating spacer 5, and the opening sides 16 </ b> A on both sides of the U-shaped insulator 16 project from the circumferential width D of the insulating spacer 5 by a width T in the circumferential direction, The bent portion 16B of the U-shaped insulator 16 is disposed so that the inner side thereof is in contact with the side surface of the insulating spacer 5, and the U-shaped insulator 16 extends in the circumferential direction from the circumferential width D of the insulating spacer 5.
Project by the thickness of The rest of FIGS. 5 and 6 is the same as the configuration of FIGS. 1 and 2, respectively.

In FIG. 5, for example, when the material of the insulating spacer 5 is a high-density press board for oil-filled insulation, and a polyamide board for gas insulation, the U-shaped insulator 16 is made of polytetrafluoroethylene for oil-filled insulation. Orethylene,
By using polypropylene for gas insulation, the relative permittivity of the U-shaped insulator 16 is smaller than that of the insulating spacer 5.

In FIG. 5, a U-shaped insulator 16 replaces the insulating plate 15 in FIG. That is, FIG.
The E section enlarged cross-sectional view of FIG.
The configuration is such that the insulating plate 15 is replaced with a U-shaped insulator 16. When a voltage is applied between the disc windings, the applied voltage at the radial end of the disc winding is changed to the insulating coating 1B of the conductor 1A, the wedge-shaped gap 17, the U-shaped insulator 16, the insulating spacer 5, Are applied in series to each other, and each of the insulating portions is divided by capacitance. If the relative permittivity of the U-shaped insulator 16 is made smaller than that of the insulating spacer 5, the U-shaped insulator 16 will share more voltage. Therefore, the shared voltage of the wedge-shaped gap 17 is reduced as compared with the case of FIG. 10A, and the electric field in the wedge-shaped gap 17 is reduced. Thereby, the dielectric strength between the disk windings is further improved. That is, the U-shaped insulator 16 replaces the conventional L-shaped insulating ring 12 shown in FIG. The U-shaped insulator 16 is projected in the circumferential direction of the disk winding 1 from both sides of the circumferential width D of the insulating spacer 5 on the circumferential side surface of the insulating spacer 5 as in the case of FIG. This is to prevent the electric field in the wedge-shaped gap 17 from being disturbed and concentrated. In FIG. 6, the inside of the bent portion 16 </ b> B of the U-shaped insulator 16 is arranged so as to contact the side surface of the insulating spacer 5. 5, the U-shaped insulator 16 may protrude from the both sides of the circumferential width D of the insulating spacer 5 by the width T in the circumferential direction. In addition,
In the actual assembly of the induction winding according to the embodiment of FIG. 5, the U-shaped insulator 16 is previously assembled so that both sides of the U-shaped insulator 16 sandwich the insulating spacer 5, and this assembly is assembled into each of the stacked circles. Since it is interposed between the plate windings 1, as shown in FIG. 6, the inside of the bent portion 16 </ b> B of the U-shaped insulator 16 is in contact with one side surface of the insulating spacer 5. It is easier to assemble and it is preferable.

In FIG. 6, the circumferential width D of the insulating spacer 5 is about 20 to 30 mm as described above.
mm, it may be about 25 to 35 mm. Conventional L
The shape of the insulation ring is 1m according to the inner and outer diameter of the disk winding 1.
Although the front and rear portions are large, the circumferential width of the U-shaped insulator 16 is smaller than that of the L-shaped insulating ring, so that the molding die is also very small. Also,
The U-shaped insulator 16 does not need to be rounded along the inner and outer circumferences of the disk winding 1. Accordingly, when the thickness of the insulating spacer 5 in the axial direction is the same, the mold for molding the U-shaped insulator 16 can be shared even if the inner and outer diameters of the disc winding 1 are different, and The figure-shaped insulator 16 can be manufactured at lower cost than before.

[0031]

According to the present invention, as described above, the radial end of the disk winding is covered so as to be in close contact with the inner surface of the groove of the U-shaped insulator opened in the radial direction. A plurality of letter-shaped insulators are arranged in the circumferential direction of the disk winding for each insulating spacer, sandwiched between the insulating spacer and the disk winding, and projecting from both sides of the insulating spacer in the circumferential direction of the disk winding. By doing so, the molding die of the insulator provided to alleviate the electric field in the wedge-shaped gap at the radial end of the disk winding may be smaller than before, and this insulator may be used. The manufacturing cost is reduced, and the cost of the entire induction winding can be reduced.

Further, in this configuration, the dielectric strength between the disk windings is further improved by making the relative dielectric constant of the U-shaped insulator smaller than that of the insulating spacer, and the winding of the induction electric machine is improved. The height of the entire line can be reduced.

Also, a plurality of insulating plates having a relative dielectric constant smaller than that of the insulating spacers are arranged in the circumferential direction of the disk winding for each insulating spacer, and the insulating plate is provided with a radial end of the disk winding and an insulating spacer. The electric field in the wedge-shaped gap at the radial end of the disk winding is alleviated by being interposed between them and projecting in the circumferential direction of the disk winding from both sides of the insulating spacer. This eliminates the need for a mold for molding an insulator provided to reduce the manufacturing cost of the disk winding, thereby reducing the overall cost of the induction winding.

A plurality of U-shaped insulators having a lower relative dielectric constant than the insulating spacers are arranged in the circumferential direction of the disk winding for each insulating spacer, and both sides of the U-shaped insulator sandwich the insulating spacer. In this manner, the disk winding is inserted between the radial end of the disk winding and the insulating spacer from the circumferential direction of the disk winding, and both sides of the U-shaped insulator are positioned around the side of the insulating spacer around the disk winding. By projecting in the directional direction, the molding die of the insulator provided to alleviate the electric field in the wedge-shaped gap at the radial end of the disk winding can be smaller than before. The manufacturing cost of this insulator is reduced, and the cost of the entire induction winding can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a configuration of an induction winding according to an embodiment of the present invention.

FIG. 2 is a view as seen from an arrow P in FIG. 1;

FIG. 3 is a sectional view of a main part showing a configuration of an induction winding according to another embodiment of the present invention;

FIG. 4 is a view taken in the direction of arrow Q in FIG. 3;

FIG. 5 is a cross-sectional view of a main part showing a configuration of an induction winding according to still another embodiment of the present invention.

6 is a view taken in the direction of the arrow R in FIG. 5;

FIG. 7 is a cross-sectional perspective view of a main part showing a configuration of a conventional induction winding.

FIG. 8 is a vertical sectional view taken along line XX of FIG. 7;

FIG. 9 is a cross-sectional view of a main part showing a configuration of a conventional different winding of an induction device.

10A is an enlarged sectional view of a part A in FIG. 8, and FIG. 10B is an enlarged sectional view of a part B in FIG.

11 is an enlarged sectional view of a part D in FIG. 3;

[Explanation of symbols]

1, 2: disk winding, 5, 10: insulating spacer, 14: U-shaped insulator, 15: insulating plate, 16: U-shaped insulator,
1C, 2C: Induction winding

Continuation of the front page (72) Inventor Masaaki Takasaka 1-1-1, Tanabe-shinden, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Fuji Electric Co., Ltd. (reference) 5E043 AA05 AB02 BA01 DA03 DA06 5E044 AD03 BA03 BB04 CA09 CB06

Claims (4)

[Claims] 1. An induction wherein a plurality of disk windings are stacked in an axial direction via insulating spacers, and a plurality of the insulating spacers are arranged in a circumferential direction of the disk windings and radially directed in a radial direction. In the electric winding, the radial end of the disk winding is covered so as to be in close contact with the inner surface of the groove of the U-shaped insulator opened in the radial direction, and the U-shaped insulator is A plurality of insulating spacers are arranged in the circumferential direction of the disk winding, sandwiched by the insulating spacer and the disk winding, and projecting from both sides of the insulating spacer in the circumferential direction of the disk winding. Induction winding. 2. The induction winding according to claim 1, wherein
An inductor winding having a U-shaped insulator having a relative dielectric constant smaller than that of an insulating spacer. 3. An induction wherein a plurality of disk windings are stacked in an axial direction via insulating spacers, and a plurality of the insulating spacers are arranged in a circumferential direction of the disk windings and radially directed in a radial direction. In the electric winding, a plurality of insulating plates having a relative permittivity smaller than that of the insulating spacer are arranged in a circumferential direction of the disc winding for each insulating spacer, and the insulating plate is insulated from a radial end of the disc winding. An induction-electric winding which is interposed between the spacer and the insulating spacer and protrudes from both sides of the insulating spacer in the circumferential direction of the disk winding. 4. An induction winding comprising a plurality of disk windings stacked in the axial direction via insulating spacers, and a plurality of said insulating spacers arranged in the circumferential direction of the disk windings and radially directed in the radial direction. In the electric winding, a plurality of U-shaped insulators having a relative dielectric constant smaller than that of the insulating spacer are arranged in the circumferential direction of the disk winding for each insulating spacer, and both sides of the U-shaped insulator are insulating spacers. Is inserted between the radial end of the disk winding and the insulating spacer from the circumferential direction of the disk winding so that both sides of the U-shaped insulator are inserted from the sides of the insulating spacer. An induction electric winding, characterized in that it protrudes in the circumferential direction.