CN1897175B - Iron core for stationary apparatus and stationary apparatus - Google Patents

Abstract

The magnetic flux distribution in the static device iron core of the present invention is relative to the total thickness of the lamination. The magnetic flux is biased towards the inner peripheral side with a short magnetic path and small magnetic resistance, and the inner peripheral side where the magnetic flux is concentrated has a high magnetic flux density and low iron loss Therefore, in order to make the magnetic flux distribution uniform in the same core roll, electromagnetic steel sheets with different magnetic properties are arranged at arbitrary lamination thickness ratios. In order to make the magnetic flux distribution in the wound core for stationary devices uniform, an electromagnetic steel plate with inferior magnetic properties than the outer peripheral side is arranged on the inner peripheral side with a short magnetic path length and small magnetic resistance, and an electromagnetic steel sheet with inferior magnetic properties than the outer peripheral side is placed on the outer peripheral side with a long magnetic path length and large magnetic resistance. The magnetic properties of the magnetic steel plate arranged on the side are better than those on the inner peripheral side, and the magnetic flux distribution in the cross-sectional area of the iron core is made uniform.

Description

Iron Cores for Stationary Devices and Stationary Devices

technical field

The present invention relates to coiled iron cores for static devices such as transformers and reactors, and relates to coils of electromagnetic steel sheets having magnetic properties (hereinafter referred to as iron loss and magnetic permeability) laminated in the same iron core at an arbitrary lamination thickness distribution ratio. An iron core, and a stationary device having the coiled iron core.

Background technique

In the wound core for a transformer, the same type of electrical steel sheets having the same magnetic properties are laminated in the same core. In recent years, as part of countermeasures against global warming, in order to reduce the loss of transformers, the iron loss (no-load loss) generated in the core or the copper loss (load loss) generated in the coil has been reduced. The former The design is such that the input amount of the magnetic steel sheet is increased, and the cross-sectional area of the iron core is ensured to reduce the magnetic flux density, or the high-priced low-loss electromagnetic steel sheet is used, resulting in an increase in the size of the iron core and cost.

In addition, Patent Document 1 (Japanese Patent Application Laid-Open No. 10-270263 ) describes that, in molding a non-wafer component material, a non-wafer component material in which a material with poor magnetic properties is on the inside and a material with good magnetic properties is on the outside is used. , forming an amorphous core.

Contents of the invention

As for the magnetic flux distribution in the wound core for stationary devices, it is generally known that the magnetic flux is biased to the inner peripheral side where the magnetic path length of the laminated electrical steel sheets is short and the magnetic resistance is small. Therefore, the magnetic flux density on the inner peripheral side of the wound core where the magnetic flux is concentrated is high, and the iron loss deteriorates. Therefore, it is important to make the magnetic flux distribution in the wound core uniform in order to achieve low loss.

It is an object of the present invention to provide an iron core for a stationary device in which electromagnetic steel sheets having different magnetic properties are arranged at arbitrary lamination thickness ratios in order to make the magnetic flux distribution uniform in the same wound iron core.

In order to solve the above-mentioned problems, in the present invention, an electromagnetic steel sheet with inferior magnetic properties than the outer peripheral side is arranged on the inner peripheral side with a short magnetic path length and small magnetic resistance, and a magnetic steel sheet with magnetic properties is arranged on the outer peripheral side with a long magnetic path length and large magnetic resistance. It is superior to the electromagnetic steel plate on the inner peripheral side, thereby making the magnetic flux distribution in the cross-sectional area of the iron core uniform, preventing the increase of the magnetic flux density on the inner peripheral side of the wound iron core, and improving the iron loss.

In addition, in the wound core for a stationary device according to the present invention, it is characterized in that an electromagnetic steel sheet whose magnetic properties are inferior to those on the outer peripheral side is arranged on the inner peripheral side having a short magnetic path length and a small magnetic resistance, so that the thickness of the wound core is equal to or greater than that of the wound core. 40% or less of the total thickness of the laminated layers, and an electromagnetic steel sheet having better magnetic properties than the inner peripheral side is arranged on the outer peripheral side.

Furthermore, in the wound iron core for stationary devices of the present invention, it is characterized in that the magnetic steel sheet on the inner peripheral side of the wound iron core is made of high-oriented silicon steel sheet, and the magnetic steel sheet on the outer peripheral side is made of magnetic domain control silicon steel sheet. plate.

In addition, in the three-phase three-column wound core composed of two inner cores and one outer core, it is characterized in that at least one of the U-column, V-column, and W-column is made of electromagnetic steel plates with different magnetic properties The iron cores were molded in combination, and each iron core was molded so that the magnetic material with poor magnetic properties accounted for 50% or less of the total thickness of the laminated layers in one column.

In addition, in the stationary device having a wound core made of laminated electromagnetic steel sheets, it is characterized in that an electromagnetic steel sheet having inferior magnetic properties than that on the outer peripheral side is arranged on the inner peripheral side with a short magnetic path length and small magnetic resistance, On the outer peripheral side where the path length is long and the magnetic resistance is large, a wound core of an electromagnetic steel sheet having better magnetic properties than the inner peripheral side is arranged.

In addition, in the above-mentioned stationary device, it is characterized in that: an electromagnetic steel sheet whose magnetic properties are inferior to those on the outer peripheral side is disposed on the inner peripheral side with a short magnetic path length and a small magnetic resistance, so that the thickness thereof is equal to the total thickness of the laminated layers of the wound core. 40% or less of , and a wound core of electromagnetic steel sheet whose magnetic properties are better than that of the inner peripheral side is arranged on the outer peripheral side.

In addition, the stationary device is characterized in that it includes a core in which the magnetic steel sheet on the inner peripheral side of the wound core is a high-oriented silicon steel sheet, and the electrical steel sheet on the outer peripheral side is a magnetic domain control silicon steel sheet.

In addition, in the three-phase three-column wound core composed of two inner cores and one outer core, it is characterized in that at least one of the U-column, V-column, and W-column is made of electromagnetic steel plates with different magnetic properties The cores are formed in combination, and the three-phase three-column wound cores of the cores are formed so that the magnetic material with poor magnetic properties accounts for 50% or less of the total thickness of the lamination of one column.

Description of drawings

Fig. 1 is a perspective view of the wound core structure of the present invention.

Fig. 2 is a perspective view of a conventional wound core structure.

Fig. 3 is a magnetic flux distribution diagram in a conventional wound core.

Fig. 4 is a front view of the iron core for characteristic verification of the present invention.

Fig. 5 shows the verification results of the iron loss characteristics of the present invention.

Fig. 6 is a comparison chart of iron loss characteristics of 1.70T according to the present invention.

Fig. 7 is a front view showing an embodiment of the three-phase three-column wound core of the present invention.

Fig. 8 is a front view showing an embodiment of the three-phase three-column wound core of the present invention.

Fig. 9 is a front view showing an embodiment of the three-phase three-column wound core of the present invention.

Fig. 10 shows a stationary device (transformer) equipped with a wound core of the present invention.

Detailed ways

Hereinafter, embodiments of the wound core structure of the present invention will be described with reference to the drawings.

Conventionally, as shown in Fig. 2, coil cores for transformers have been produced by laminating the same type of electromagnetic steel sheets having the same magnetic properties in the same core. The magnetic flux distribution in this coil core 4 is shown in Fig. 3. The magnetic flux is biased toward the inner peripheral side of the laminated electrical steel sheets where the magnetic path is short and the magnetic resistance is small. Therefore, on the inner peripheral side of the wound core where the magnetic flux is concentrated, the magnetic flux density increases and the iron loss increases.

In the wound iron core of the present invention, the electromagnetic steel sheet with poor magnetic properties is arranged on the inner peripheral side with a short magnetic path length, and the electromagnetic steel sheet with superior magnetic properties is arranged on the inner peripheral side at the outer peripheral side with a long magnetic path length. The magnetic flux distribution in the cross-sectional area of the core is uniform.

[Example 1]

Fig. 1 is a coiled iron core 1 made of two types of electrical steel sheets with different magnetic properties, and a highly oriented silicon steel plate 2 is arranged on the inner peripheral side of the coiled iron core 1 to make the magnetic properties better than that of the highly oriented silicon steel plate 2 The magnetic domain control silicon steel plate 3 is disposed on the outer peripheral side of the wound core. The term "highly oriented silicon steel sheet" here refers to a silicon steel sheet in which the passing direction of magnetic flux coincides with the rolling direction of the material. The so-called magnetic domain control silicon steel plate is a silicon steel plate with high orientation silicon steel plate as raw material, forming shallow grooves on its surface to subdivide the magnetic domain, and its magnetic properties are better than that of high orientation silicon steel plate. In this wound core structure, No. 1 to No. 4 in FIG. 4 represent electrical steel sheets 2 and 3 with different lamination thickness ratios. The wound core No. 1 in Fig. 4 is a wound core manufactured by controlling only the magnetic domain silicon steel plate 3 for the purpose of comparing iron loss characteristics. On the other hand, No. 2 coiled iron core is arranged on the inner peripheral side of the high-oriented silicon steel plate 2, and its lamination thickness ratio is 25%, and the magnetic properties are better than the magnetic domain control of the high-oriented silicon steel plate 2. The silicon steel plate b was arranged on the outer peripheral side, and a wound core having a thickness ratio of 75% was laminated. In the wound cores of No. 3 and No. 4, the arrangement was the same as that of No. 2, and the lamination thickness ratios of the highly oriented silicon steel sheets 2 on the inner peripheral side were 50% and 75%, respectively. The results of verification of iron loss characteristics in these wound cores are described below.

FIG. 5 shows the test results of the excitation characteristics of the iron loss of each iron core No. 1 to No. 4 in FIG. 4 , the horizontal axis represents the magnetic flux density, and the vertical axis represents the relative value of the iron loss. It can be seen from Fig. 5 that when the magnetic flux density changes from 1.55T to 1.85T, the iron loss characteristics deteriorate in the order of No.2, No.1, No.3, and No.4.

In addition, Fig. 6 is a comparison of each iron loss value when the magnetic flux density is 1.70T, and shows the relative value of each iron loss when the iron loss value of No. 1 is taken as 100% (the measurement frequency is 50 Hz). In Fig. 6, the No. 2 coiled iron core exhibits the best iron loss value. At a magnetic flux density of 1.70T, it is better than the No. 1 coiled iron core composed of only the magnetic domain control silicon steel plate 3. The iron loss value has been improved by approximately 2%. In addition, when the lamination thickness ratio of the highly oriented silicon steel sheet 2 on the inner peripheral side is 50% or more, the iron loss tends to increase.

Generally, it is known that the magnetic flux in the wound core is biased to the inner peripheral side where the magnetic path is short and the magnetic resistance is small for the entire lamination thickness. In this verification, by arranging the highly oriented silicon steel sheet 2 on the inner peripheral side of the coiled iron core, the magnetic domain control silicon steel sheet 3 having better magnetic properties than the highly oriented silicon steel sheet 2, that is, having high magnetic permeability is arranged on the outer peripheral side. , so that the magnetic flux distribution in the cross-sectional area of the iron core is uniform, and the iron loss is improved. However, from the results of this test, it can be confirmed that even if the highly oriented silicon steel sheet 2 whose magnetic properties are inferior to those on the outer peripheral side is arranged on the inner peripheral side so that the laminated thickness ratio becomes 50% or more, high orientation is exhibited. The increase in the input amount of the high-strength silicon steel sheet 2 tends to increase the iron loss. From the above, it can be seen that the lamination thickness ratio of the highly oriented silicon steel sheet b, which has inferior magnetic properties on the inner peripheral side compared to the outer peripheral side, is preferably 40% or less.

The iron loss of the iron core was obtained from the product of the iron loss (W/Kg) characteristics inherent in each electrical steel sheet and the service mass (Kg). Even when electrical steel sheets with different magnetic properties are laminated in the same iron core, it is considered theoretically to obtain the sum of the products of the inherent iron loss (W/Kg) characteristics of each electrical steel sheet and the service mass (Kg) Iron core loss. However, it can also be verified that the magnetic flux distribution in the cross-sectional area of the core is uniform by arranging an electrical steel sheet with inferior magnetic properties than that on the outer peripheral side at an appropriate lamination thickness ratio on the inner peripheral side of the wound core, and that it is possible to obtain a Iron loss value with small loss theoretical value. Therefore, even if an inexpensive electrical steel sheet having poor magnetic properties is used on the inner peripheral side of the wound core, an inexpensive wound core with a suppressed iron loss increase rate can be manufactured.

[Example 2]

Fig. 7 is a three-phase three-column wound core composed of two inner wound cores 5a and one outer wound core 6a arranged around them, and grain-oriented silicon steel plates 7a, 9a are arranged on the inner circumference of each wound core. On the outer peripheral side, high-oriented silicon steel sheets 8a and 10a having magnetic properties superior to those of grain-oriented silicon steel sheets are arranged on the wound core. The three-phase three-column wound core in FIG. 7 is a three-phase three-phase structure in which both the inner core 5a and the outer core 6a are arranged on the inner peripheral side of the wound core, and the lamination thickness ratio of the grain-oriented silicon steel sheets 7a and 9a is 25%. Three-column rolled iron core. In addition, in the three-phase three-column wound core in Fig. 7, the overall lamination thickness ratio of the U column, V column, and W column in any column is 25% for the grain-oriented silicon steel plate.

The three-phase three-column wound core in FIG. 8 is composed of two inner wound cores 5b and one outer wound core 6b arranged around them, and a grain-oriented silicon steel plate 7b is arranged on the inner peripheral side of the inner wound core 5b. A three-phase three-column wound core in which the highly oriented silicon steel plate 8b is disposed on the outer peripheral side, the highly oriented silicon steel plate 10b is disposed on the inner peripheral side of the outer wound core 6b, and the grain-oriented silicon steel plate 9b is disposed on the outer peripheral side . In the three-phase three-column wound core in FIG. 8 , the lamination thickness ratio of the grain-oriented silicon steel sheet 7b arranged on the inner peripheral side of the inner wound core 5b is 25%, and the outer wound core 6b is arranged on the outer peripheral side. A three-phase three-column wound core with a lamination thickness ratio of the grain-oriented silicon steel plate 9b of 25%. In addition, in the three-phase three-column wound core shown in FIG. 8, the overall lamination thickness ratio of the U column, V column, and W column in any column is 25% for the grain-oriented silicon steel sheet.

The three-phase three-column wound core in FIG. 9 is composed of two inner wound cores 5c and one outer wound core 6c arranged around them, and a grain-oriented silicon steel plate 7c is arranged on the inner peripheral side of the inner wound core 5c. , the highly oriented silicon steel plate 8c is disposed on the outer peripheral side, and all the highly oriented silicon steel plates 10c are disposed in the three-phase three-column wound core in the outer wound core 6c. In addition, this inner wound core 5c is arranged so that the lamination thickness ratio of the grain-oriented silicon steel sheet 7c arranged on the inner peripheral side is 50%. In addition, in the three-phase three-column wound core shown in Figure 9, the overall laminated thickness ratio of the U column, V column, and W column, in terms of the laminated thickness ratio of the directional silicon steel plate, the U column is 25%, and the V column is 25%. Column is 50%, W column is 25%.

The iron loss of the iron core was obtained from the product of the iron loss (W/Kg) characteristics inherent in each electrical steel sheet and the service mass (Kg). Even when electrical steel sheets with different magnetic properties are laminated in the same iron core, theoretically, it can be calculated by the sum of the product of the inherent iron loss (W/Kg) characteristics of each electrical steel sheet and the service mass (Kg) Iron core loss.

However, according to the present invention, an iron loss value smaller than the above-mentioned theoretical value of iron loss can be obtained even It is also possible to manufacture an inexpensive coiled core that suppresses the rate of increase in iron loss by using an inexpensive electrical steel sheet with poor magnetic properties.

[Example 3]

Fig. 10 shows the above-mentioned wound core, that is, the electromagnetic steel sheet with inferior magnetic properties than the outer peripheral side is arranged on the inner peripheral side with a short magnetic path length and small magnetic resistance, and the electromagnetic steel sheet with better magnetic properties than the inner peripheral side is arranged on the magnetic The stationary device 11 of the wound core on the outer peripheral side with a long path length and a large magnetic resistance.

In addition, in the above-mentioned static device, it is shown that an electromagnetic steel sheet having inferior magnetic properties than the outer peripheral side is arranged on the inner peripheral side with a short magnetic path length and a small magnetic resistance, and the thickness thereof is 40% of the total laminated thickness of the wound core. Hereinafter, a stationary device 11 having a wound core of an electromagnetic steel sheet whose magnetic properties are superior to those on the inner peripheral side is disposed on the outer peripheral side.

In addition, in the stationary device, the stationary device 11 having a wound core in which the magnetic steel sheet on the inner peripheral side of the wound core is a highly oriented silicon steel sheet and the magnetic steel sheet on the outer peripheral side is a magnetic domain control silicon steel sheet is shown.

In addition, in the stationary device having a three-phase three-column wound core composed of two inner cores and one outer core, it means that each core is formed in such a way that at least one of the U-column, V-column, and W-column The static device 11 of the three-phase three-column wound core is composed of electromagnetic steel plates with different magnetic properties, and the magnetic material with poor magnetic properties is less than 50% of the total thickness of the lamination of one column.

Claims (6)

1. a stationary apparatus is that the stationary apparatus that the electromagnetic steel plate lamination is constituted is used the volume iron core with the volume iron core, it is characterized in that:

Short in the length of magnetic path, that magnetic resistance is little interior all sides dispose the magnetic characteristic high orientation silicon steel plate more inferior than outer circumferential side, the outer circumferential side long in the length of magnetic path, that magnetic resistance is big dispose magnetic characteristic be superior in the magnetic domain control silicon steel plate of all sides.

2. stationary apparatus according to claim 1 is characterized in that with the volume iron core:

Short in the length of magnetic path, that magnetic resistance is little interior all sides dispose said high orientation silicon steel plate, make lamination gross thickness 40% below of its thickness for the volume iron core, dispose said magnetic domain control silicon steel plate at its outer circumferential side.

3. a three-phase three-leg roll-core is made up of two interior iron cores, an outer iron core, and is formed with first post, second post and the 3rd post, it is characterized in that:

With at least one post in first post, second post, the 3rd post by the mode of the different electromagnetic steel plate of magnetic characteristic combination each iron core that is shaped; In each iron core; Short in the length of magnetic path, that magnetic resistance is little interior all sides dispose the magnetic characteristic high orientation silicon steel plate more inferior than outer circumferential side; The outer circumferential side long in the length of magnetic path, that magnetic resistance is big dispose magnetic characteristic be superior in the magnetic domain control silicon steel plate of all sides

So that in the lamination gross thickness of a post, the magnetic material that magnetic characteristic is inferior is each iron core that is shaped of the mode below 50%.

4. stationary apparatus has the lamination electromagnetic steel plate and the volume iron core that constitutes, it is characterized in that possessing:

Short in the length of magnetic path, that magnetic resistance is little interior all sides dispose the magnetic characteristic high orientation silicon steel plate more inferior than outer circumferential side, the outer circumferential side long in the length of magnetic path, that magnetic resistance is big dispose magnetic characteristic be superior in the volume iron core of magnetic domain control silicon steel plate of all sides.

5. stationary apparatus according to claim 4 is characterized in that possessing:

Short in the length of magnetic path, that magnetic resistance is little interior all sides dispose said high orientation silicon steel plate, make lamination gross thickness 40% below of its thickness for the volume iron core, dispose the volume iron core of said magnetic domain control silicon steel plate at its outer circumferential side.

6. stationary apparatus possesses by two interior iron cores, an outer iron core and constitutes, and is formed with the three-phase three-leg roll-core of first post, second post and the 3rd post, it is characterized in that possessing:

So that at least one post in first post, second post, the 3rd post is by the mode of the different electromagnetic steel plate combination of magnetic characteristic each iron core that is shaped; In each iron core; Short in the length of magnetic path, that magnetic resistance is little interior all sides dispose the magnetic characteristic high orientation silicon steel plate more inferior than outer circumferential side; The outer circumferential side long in the length of magnetic path, that magnetic resistance is big dispose magnetic characteristic be superior in the magnetic domain control silicon steel plate of all sides

So that in the lamination gross thickness of a post, the magnetic material that magnetic characteristic is inferior is the be shaped three-phase three-leg roll-core of each iron core of the mode below 50%.

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