JPH08330184A - Capacitor - Google Patents

Abstract

PURPOSE: To suppress magnetostrictive oscillation and heating phenomenon in the vicinity of power introduction terminal and to deal with high ripple well by providing a highly reliable metal case excellent in weatherability and low heating properties. CONSTITUTION: A power introduction terminal 11 is taken out from a capacitor element 9 in a metal case 8 through an insulator 10. The insulator 10 is fixed to the metal case 8 through an encapsulation metal made of a material exhibiting dielectric constant μr in the range of 1-10 under normal temperature after encapsulation and the encapsulating part is jointed by a metallurgical method. The metal case 8 is made of a material having dielectric constant μr in the range of 1-10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor in which a power introduction terminal is taken out from a capacitor body inside a metal container via an insulator.

[0002]

2. Description of the Related Art For example, as a capacitor for industrial equipment, there is a capacitor used for removing a high ripple of a power converter in a variable speed drive of an electric motor. In FIG.
An application of such a capacitor to a power converter is shown. This power converter converts the electric power from the single-phase power supply 1 into a direct current, converts the converted direct current into a three-phase alternating current power, and uses it as a variable speed power supply to the three-phase electric motor 7. That is, the voltage of the single-phase power supply 1 is transformed by the transformer 2 and input to the converter device 4 via the electromagnetic contactor 3. The converter device 4 converts single-phase power into DC power, and is provided with a capacitor 5 for removing high ripple superimposed on DC at the time of the conversion. The DC power smoothed by removing the high ripple by the capacitor 5 is
The inverter device 6 converts the three-phase AC power having a frequency required for controlling the three-phase electric motor 7. As a result, the three-phase AC motor 7 is controlled at a variable speed.

In such a power converter, it is necessary to facilitate the control of the three-phase motor 7 and reduce the voltage ripple in the DC stage as much as possible. Therefore, in order to reduce the magnetostrictive noise of the transformer 2 and the noise at the time of driving the motor, the capacitor 5 of the DC stage has a large capacity, and the switching frequency of the converter or the inverter using the high-frequency switching element tends to be high. It is in.

FIG. 1 is an explanatory diagram of a capacitor 5 used in such a power converter. As can be seen from FIG. 1, the capacitor 5 has a capacitor body 9 inside a metal container 8.
The power-introducing terminal 11 is taken out through the insulator 10 from. The capacitor body 9 is a wound unit element 12
16 pieces are used and are formed integrally by being combined in 4 rows and 4 stages. The capacitor body 9 is housed in the box-shaped corrugated press board 13 and housed in the upper open metal container 8.

The capacitor body 9 is fixed to the metal container 8 by the metal fixing plate 1 provided on the capacitor body 9.
It is performed by 4. As shown in FIG. 2, the metal fixing plate 14 includes a holding plate 15 and side plates 1 that are erected on both sides thereof.
The side plate 16 is fixed to the inner surface of the side wall of the metal container 8 by spot welding or soldering. With this metal fixing plate 14, the capacitor body 9 is fixed so as not to move toward the opening of the metal container 8.

Conventionally, the main body of the metal container 8 is composed of a steel plate, a tin plate, a brass plate, etc., and the capacitor element body 9 is inserted thereinto and the metal container 8 is assembled in the order of sealing. The lid that constitutes a part of the main body of the metal container 8 is
A terminal portion is provided. That is, the power introduction terminal 11 is attached via the above-mentioned insulator 10.
The power introduction terminal is integrated with the current-carrying portion through the insulator 10 and connected to the capacitor body 9.

When an alumina ceramic is used for the insulator 10 of the terminal portion, a metallized layer such as Mo-Mn is usually formed on the ceramic surface for sealing the current-carrying portion and the ceramic, and the ceramic and the metal container 8. , Silver brazing is performed via the Ni plating layer and the like.

In practice, due to the difference in thermal expansion between the ceramic and the metal container 8 to be joined, and the problem of silver brazing property, there is an intermediate between the ceramic and the metal container 8. Bonding is performed through a sealing metal having a specific coefficient of thermal expansion. As a metal having such an intermediate coefficient of thermal expansion, in consideration of silver brazing, 42Ni-Fe alloy or 17Co-29 is used.
Ni-Fe alloy (Kovar) or the like is used. As described above, in the conventional case, the metal container 8 of the insulator 10 is used.
These metal sealing metal fittings are arranged in the attachment / sealing portion and are joined via the sealing metal fittings.

[0009]

However, the 42% Ni-Fe alloy or 17Co-29N used for this sealing metal fitting is used.
Since the i-Fe alloy is a ferromagnetic material having a relative magnetic permeability μr of μr ≧ 100, when an alternating current flows through the power introducing terminal 11, a circular alternating magnetic field is generated around the axis of the power introducing terminal 11. To do. Due to the magnetostriction phenomenon of the sealing metal fitting due to this alternating magnetic field, there occurs a phenomenon that it expands and contracts in the circumferential direction and vibrates, generating heat and making noise.

Here, the alternating magnetic field acting on the sealing metal of the capacitor 5 is not limited to a circular magnetic field, but may be an axial magnetic field, a lateral magnetic field, or a commercial magnetic field due to the influence of polyphases, the arrangement of conductors and parts, and the like. Since a harmonic component such as a third harmonic with respect to the frequency (50 Hz, 60 Hz) is also included, magnetostrictive vibration and heat generation phenomena in the vicinity of the power introduction terminal 11 cannot be avoided. Further, stress may occur at the sealing interface between the insulator 10 and the sealing metal member, and the sealing interface is easily damaged.

On the other hand, since the main body of the metal case 8 is also made of a steel plate, a tin plate, a brass plate, etc., it has the following problems.

When a brass plate is selected as the material of the metal case 8, it has advantages in terms of workability and solderability, but has problems of weldability and mechanical strength.

On the other hand, when a steel plate or a tin plate is selected as the material of the metal case 8, the weldability and mechanical strength are excellent, but the steel plate or the tin plate is easily affected by the atmosphere or environment in which it is installed. May corrode. When the material of the metal case 8 deteriorates due to this corrosion, there is a concern that the oil in the metal case 8 may leak to the outside. Further, the relative magnetic permeability μr of the steel plate and the tin plate is μr ≧
It has a serious problem that it is a ferromagnetic material having 100.

That is, when an alternating current flows through the power introduction terminal 11, an alternating magnetic field is also generated in the metal case 8, and the alternating magnetic field causes the steel plate and the tin plate to expand and contract due to the magnetostriction phenomenon to vibrate and generate heat. It has a serious problem that it emits noise. According to the experiments conducted by the inventors, it was found that an alternating magnetic field is induced in the metal case 8 even if a material in a non-magnetic state is used only for the power introduction terminal 11.

By the way, the alternating magnetic field acting on the metal case 8 of the capacitor 5 is not limited to the above-mentioned magnetic field, but due to the influence of polyphase and the influence of the arrangement of conductors and parts, an axial magnetic field, a lateral magnetic field, and Includes a harmonic current component for a commercial frequency (50, 60 Hz) such as the third harmonic, so that magnetostrictive vibration and heat generation phenomenon in the vicinity of the metal case 8 cannot be avoided. The heat generation of the metal case 8 also promotes the temperature rise at the sealing interface between the insulator 10 and the sealing metal fitting, and the stress may be generated at this portion to easily damage the sealing interface.

An object of the present invention is to provide a highly reliable metal case excellent in weather resistance and low heat generation property while suppressing magnetostriction vibration and heat generation phenomenon in the vicinity of the power introduction terminal, and as a result, high ripple compatibility. Is to provide an excellent capacitor.

[0017]

According to a first aspect of the present invention, a power-introducing terminal is taken out from a capacitor body inside a metal container through an insulator, and an insulator is attached to a metal container. As a sealing metal fitting for a capacitor that is bonded via a seal, the relative magnetic permeability μr at room temperature after sealing is 1
A material of ≦ μr ≦ 10 is selected, and the sealing portion is joined by a metallurgical joining method.

According to a second aspect of the invention, the material of the insulator of the first aspect is mainly composed of alumina ceramics, and the connection with the sealing metal fitting is metallized by the Mo-Mn method, and then metallurgy. They are joined by the dynamic joining method.

According to a third aspect of the invention, the material of the insulator of the first aspect is mainly composed of alumina ceramics, and the connection with the sealing metal fitting is performed after metalizing by the active metal method of Ti, It is joined by a metallurgical joining method.

The invention of claim 4 is the first to third aspects of the invention.
The sealing metal fitting may be composed of a nickel-copper alloy in which Ni is 25 to 70% by weight and the balance is substantially Cu.

[0021] The invention of claim 5 is from claim 1 to claim 3.
25 to 70% by weight of Ni, 1.0 for Si
It is composed of a nickel-copper alloy whose content is less than or equal to wt% and the balance is substantially Cu.

The present invention of claim 6 is any of claims 1 to 3.
25 to 70% by weight of Ni, 1.0 for Si
It is composed of a nickel-copper alloy whose content is 5% by weight or less, the total amount of Fe and Co is 5% by weight or less, and the balance is substantially Cu.

The invention of claim 7 is from claim 1 to claim 3.
25 to 70% by weight of Ni, 1.0 for Si
It is composed of a nickel-copper alloy in which the total amount of Si and Mn is 1.5% by weight or less, the total amount of Fe and Co is 5% by weight or less, and the balance is substantially Cu.

[0024] The invention of claim 8 is from claim 1 to claim 3.
63 to 70% by weight of Ni and 2.5 for Si
Wt% or less, Mn is 2.0 wt% or less, and the balance is 20 to 3
It is composed of a nickel-copper alloy composed of 5 wt% Cu.

[0025] The invention of claim 9 relates to claim 1 to claim 3.
50% by weight or more of Ni and 18 to 3 of Cr
It is composed of 0% by weight of high NiCr steel.

The invention of claim 10 is the high NiC of claim 9.
The r-steel contains 1 wt% or more of Fe.

The invention of claim 11 is the high NiC of claim 9.
More than 1 wt% Fe and 2 wt% Mo in r-steel
The above is included.

According to a twelfth aspect of the present invention, the sealing metal fitting of the first to third aspects is made of austenitic stainless steel.

According to a thirteenth aspect of the present invention, the austenitic stainless steel according to the twelfth aspect is configured such that Ni is 6 to 28% by weight or more, Cr is 16 to 26% by weight, and Fe is 75% by weight or less.

According to a fourteenth aspect of the present invention, the austenitic stainless steel according to the thirteenth aspect contains 1 wt% or more of Mo.

According to a fifteenth aspect of the present invention, the sealing metal fitting of the fourth to fourteenth aspects has a coating layer containing Cu as a main component.

According to a sixteenth aspect of the present invention, the material of the metal case of the capacitor is such that the power introduction terminal is taken out from the capacitor body inside the metal case through the insulator.
A material having a relative magnetic permeability μr of 1 ≦ μr ≦ 10 is used.

According to a seventeenth aspect of the present invention, in the sixteenth aspect of the present invention, the metal case is made of a nickel-copper alloy in which Ni is 25 to 70% by weight and the balance is substantially Cu.

According to an eighteenth aspect of the invention, in the sixteenth aspect of the invention, the metal case contains 25 to 70% by weight of Ni and Si.
Is 1.0% by weight or less, and the balance is a nickel-copper alloy consisting essentially of Cu.

A nineteenth aspect of the invention is the invention of the sixteenth aspect, wherein the metal case contains 25 to 70% by weight of Ni and Si.
Is 1.0% by weight or less, the total of Fe and Co is 5% by weight or less, and the balance is substantially composed of Cu.

According to a twentieth aspect of the invention, in the sixteenth aspect of the invention, the metal case contains 25 to 70% by weight of Ni and Si.
Is 1.0% by weight or less and the sum of Si and Mn is 1.5.
It is composed of a nickel-copper alloy in which the content of Fe and Co is 5% by weight or less and the balance is substantially Cu.

According to a twenty-first aspect of the invention, in the sixteenth aspect of the invention, the metal case contains 63 to 70% by weight of Ni and Fe.
Is 2.5% by weight or less, Mn is 2.0% by weight or less, and the balance is Cu.

According to a twenty-second aspect of the invention, in the sixteenth aspect of the invention, the metal case is made of a high NiCr steel having 18 to 30% by weight of Cr and the balance being Ni.

In a twenty-third aspect of the present invention based on the sixteenth aspect, the metal case contains 18 to 30 wt% of Cr and Ni.
Is 50 wt% or more, Fe is 1 wt% or more, Cr,
It is composed of a high NiCr steel in which the total of Ni and Fe is 100% by weight.

According to a twenty-fourth aspect of the present invention, in the sixteenth aspect, the metal case contains 18 to 30% by weight of Cr and Ni.
Is 50% by weight or more, Fe is 1% by weight or more, Mo is 2% by weight or more, and the total of Cr, Ni and FeMo is 100% by weight.

According to a twenty-fifth aspect of the present invention, in the sixteenth aspect of the present invention, the metal case is made of austenitic stainless steel.

According to a twenty-sixth aspect of the invention, in the twenty-fifth aspect of the invention, the metal case is composed of an austenitic stainless steel consisting of 6 to 28% by weight of Ni, 16 to 26% by weight of Cr, and the balance of Fe. Is.

According to a twenty-seventh aspect of the invention, in the twenty-fifth aspect of the invention, the metal case has 6 to 28% by weight of Ni, 16 to 26% by weight of Cr, 1% by weight or more of Mo, and 75% by weight or less of Fe. Then, it is composed of an austenitic stainless steel in which the total amount of Ni, Cr, Mo and Fe is 100% by weight.

In a twenty-eighth aspect of the present invention based on the sixteenth to twenty-seventh aspects, the metal case has a coating layer containing Cu as a main component.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. First, the first to fifth embodiments of the sealing metal fitting of the mounting and sealing portion of the insulator 10 to the metal container 8 will be described.

In the first embodiment, as a material for the sealing metal fitting of the capacitor 5, the non-permeability μr is approximately 1 or 1 ≦ μr.
A material of ≦ 10 is used, and Ni is 2
The nickel-copper alloy is 5 to 70% by weight and the balance is substantially Cu.

The first embodiment of the present invention will be described below with reference to Examples 1 to 3, Comparative Example 1 and Comparative Example 2. An insulator made of 92% alumina whose surface was Mo—Mn metallized and a Cu electrode were prepared, and the metal fittings having the synthetic components shown in Table 1 were prepared. That is, 15 Ni-Cu as Comparative Example 1 and 2 as Example 1.
5Ni-Cu, 55Ni-Cu as Example 2, 70Ni-Cu as Example 3, and 80Ni-C as Comparative Example 2.
u were prepared respectively.

[0048]

[Table 1]

Table 2 shows these characteristics.

[0050]

[Table 2]

The relative magnetic permeability μr at room temperature after sealing the materials for these metal fittings is approximately 1 or 1 ≦ μr ≦ 10 in Comparative Example 1 and Examples 1 to 3. In Comparative Example 2, μr ≧ 10 to 100.

A capacitor single element was prepared by using each member of these sealing metal fittings and mounted in the metal container 8. The mounting in this case is performed by a metallurgical joining method such as welding, diffusion joining, or brazing. Then, a predetermined voltage is applied to both ends of the single element to obtain a ripple current of 120 A peak and a frequency of 1 KH.
z was repeatedly injected. As a result, a thermocouple was attached to the base portion of the power introduction terminal portion of the lid portion of the metal container 8 and the temperature rise of this portion was measured. That is, when the actual temperature rise obtained by subtracting the ambient temperature was measured, Examples 1 to 3 were obtained.
Was 0.5 to 3K.

In Comparative Example 1 as well, it was 0.5 to 2K, which was almost the same. However, in Comparative Example 1, although there was no problem in terms of temperature rise, the corrosion resistance test conducted as a reference showed a problem in the corrosion resistance. Observation of the surface appearance of the 72-hour neutral salt fog test showed that a green product was generated on the surface, which showed a problem in its corrosion resistance. On the other hand, Comparative Example 2 not only shows a high value of 16 to 25 K and is not preferable, but when used as a film capacitor, accelerated deterioration of the heated insulating oil is observed. About 15-2 compared to
The life was shortened by 5%.

That is, in Comparative Example 1 in which the amount of Ni was 15%, a green discoloration was observed on the entire surface in the corrosion resistance test. Further, in Comparative Example 2 in which the amount of Ni was 80%, noise was generated due to the influence of the ferromagnetic material, and a difference in temperature rise was observed. On the other hand, in the case of Examples 1 to 3 in which the amount of Ni was 25 to 70% and the balance was Cu, the temperature rise was low and noise was hardly generated. This range is suitable because only a few green corroded parts on the surface were seen.

Next, a second embodiment of the present invention will be described. The second embodiment is an evaluation of Si-added Cu-Ni for improving workability in consideration of a large Cu-Ni-based ingot, and Examples 4 to 6 and Comparative Example 3 Was evaluated.

Similar to Examples 1 to 3 and Comparative Example 1 and Comparative Example 2 in the first embodiment, the predetermined surface is Mo-
Insulator made of Mn metalized 92% alumina and C
Electrodes made of u were prepared, and the synthetic metal components shown in Table 3 were prepared as the sealing metal fittings. That is, as a fourth embodiment, 55N
i-0.4Si-Cu, 55Ni-1.
0Si-Cu, as Comparative Example 3 55Ni-5.6Si-
Cu and 25Ni-1.0Si-Cu as Example 6 were prepared.

[0057]

[Table 3]

Table 2 shows these characteristics.

[0059]

[Table 4]

The relative magnetic permeabilities μr at room temperature after sealing the materials for these sealing metal fittings were all about 1. Further, the addition of Si did not lower the brazing property.

A capacitor single element was prepared using each member of these sealing metal fittings and mounted in the metal container 8. The mounting in this case is performed by a metallurgical joining method such as welding, diffusion joining, or brazing. Then, a predetermined voltage is applied to both ends of the single element to obtain a ripple current of 120 A peak and a frequency of 1 KH.
z was repeatedly injected. Examples 1 to 3 and Comparative Example 1
And the temperature rise of the root part of the power introduction terminal part of the lid part of the metal container 8 was measured on the same conditions as the comparative example 2. As a result, S
In Examples 4 and 5 in which the i amount was 1% or less, both were in the range of 0.5 to 3, which was a group of preferable temperature rise characteristics. In addition, although there was no problem in any of the corrosion resistance tests, in the case of Comparative Example 3 in which the amount of Si is 5.6%, especially during cold working of the plate working operation when obtaining the material as the sealing metal fitting. Generation of cracks was observed, which was unfavorable as a plate material for capacitors.

In Examples 4 and 5, 55Ni-C was used.
Although it was based on u, the same characteristics were exhibited even in the case of Example 6 in which the Ni content was 1%. Therefore, if workability is taken into consideration from the viewpoint of obtaining a capacitor plate material, Ni-
The upper limit of the amount of Si for improving the Cu system is 1% or less.

Next, a third embodiment will be described. When using a Cu-Ni alloy as a sealing metal material for a capacitor, and further considering the special circumstances in which it is used in a harsh environment or conditions, the alloy may be Cu-Ni alloy depending on the manufacturing conditions. A large amount of oxygen may remain inside. Therefore, there is a demand to further improve cold workability and hot workability, and further improve corrosion resistance.

Therefore, in the third embodiment, in order to further improve the workability of the Cu--Ni system, as in Examples 4 to 6 and Comparative Example 3 in the second embodiment,
Cu- co-added with (Si + Mn) and (Fe + Co)
Examples 7 and 8 for Ni and Comparative Examples 4 and 5 were evaluated.

That is, as in Examples 4 to 6 and Comparative Example 3, Mo--Mn metallization was performed on a predetermined surface 92.
%, An insulator made of alumina and an electrode made of Cu were prepared, and Examples 7 and 8 of synthetic components shown in Table 5, Comparative Examples 4 and 5 were prepared as sealing metal fittings.

[0066]

[Table 5]

Table 6 shows these characteristics.

[0068]

[Table 6]

First, 55Ni-Cu is used as a base (Si +
Example 7 in which (Mn) is 1.5% and (Fe + Co) is 5% or less (relative magnetic permeability μr is 1 ≦ μr ≦ 10), and 55Ni−
Based on Cu, (Si + Mn) is 1.5% and (Fe + C
o) is 9.5% or less (relative magnetic permeability μr is μr ≧ 10) and Comparative Example 4 will be described.

A capacitor single element was prepared by using each member of these sealing metal fittings and mounted in the metal container 8. The mounting in this case is performed by a metallurgical joining method such as welding, diffusion joining, or brazing. Then, a predetermined voltage is applied to both ends of the single element to obtain a ripple current of 120 A peak and a frequency of 1 KH.
z was repeatedly injected. As a result, a thermocouple was attached to the base portion of the power introduction terminal portion of the lid portion of the metal container 8 and the temperature rise of this portion was measured. That is, when the actual temperature rise after subtracting the ambient temperature was measured, Example 7 showed about 1 to 4K.
Although the temperature rise value was low, the comparative example 4 had a 5-1 value.
It was 2K and showed a slight upward trend. However, both brazing properties were improved.

The amount of Si in (Si + Mn) is 1
If the content exceeds%, the brazing property becomes poor due to the selective oxidation of Si. Also, the presence of (Fe + Co)
It contributes to the improvement of corrosion resistance. However, when Fe in (Fe + Co) exceeds 5% and is added in a large amount, as is apparent from Comparative Example 4, the corrosion thickness is increased, which is not preferable. Addition of Co had the same tendency.

Next, based on 55Ni-Cu (Si +
Example 8 in which (Mn) is 0.6% and (Fe + Co) is 3.3% or less (relative permeability μr is 1 ≦ μr ≦ 10), and 55N
Based on i-Cu, (Si + Mn) is 0.6% and (Fe
+ Co) is 9.2% or less (relative permeability μr is μr ≧ 1
Comparative example 5 of 0) will be described.

A capacitor single element was prepared by using each member of these sealing metal fittings and mounted in the metal container 8. The mounting in this case is performed by a metallurgical joining method such as welding, diffusion joining, or brazing. Then, a predetermined voltage is applied to both ends of the single element to obtain a ripple current of 120 A peak and a frequency of 1 KH.
z was repeatedly injected. As a result, a thermocouple was attached to the base portion of the power introduction terminal portion of the lid portion of the metal container 8 and the temperature rise of this portion was measured. That is, when the actual temperature rise obtained by subtracting the ambient temperature was measured, Example 8 showed about 1 to 4K.
Although the temperature rise value was slightly low, Comparative Example 5 was 4 to 11K.
And showed a slight upward trend. However, the brazing property was not a problem. As in Comparative Example 5, when (Fe + Co) is 9.2%, it is not preferable from the viewpoint of corrosion resistance.

Therefore, from the viewpoint of obtaining the plate material for the capacitor, the coexistence addition range of the (Si + Mn) amount and the (Fe + Co) amount is determined, and the values are (Si + Mn) amount of 1.5% or less, (Fe + Co) The amount is preferably 5% or less.

Next, a fourth embodiment of the present invention will be described with reference to Examples 9 and 10, Comparative Examples 6 and 7. The alloy components are shown in Table 7.

[0076]

[Table 7]

Table 8 shows these characteristics.

[0078]

[Table 8]

As a plate material for capacitors, M of 2% or less is used.
When Cu and Ni alloys in which n and 2.5% or less of Fe were jointly added, that is, Example 9 and Example 10 were evaluated in the same manner as Example 7 and Example 8, the same effect was exhibited. . However, as in Comparative Examples 6 and 7, M
When the amount of n and the amount of Fe are large, it is acceptable in terms of temperature rise characteristics, but it is not preferable from the viewpoint of sound junction formation. Exclude it because the overall reliability for practical use is obtained.

Next explained is the fifth embodiment of the invention. In the fifth embodiment, a Cu-Ni alloy is replaced with a Ni-Cr alloy.

That is, the conventional 42Ni-Fe alloy or 1
When 7Co-29Ni-Fe alloys are used as the sealing metal material for capacitors, these alloys have a relative magnetic permeability μr.
Is a fatal defect due to μr ≧ 100,
For example, there is a decrease in characteristics in terms of temperature rise characteristics. As an alloy suitable for improving this, in Examples 1 to 10, the implementation situation was described with respect to the effect of applying the Cu—Ni based alloy and the improved Cu—Ni based alloy.

However, the relative magnetic permeability μr focused on in the present invention is within a predetermined range, and it is required as a sealing metal fitting material for capacitors to have workability for processing into a plate shape, and to have corrosion resistance to withstand use environment. When satisfying requirements other than temperature rise characteristics such as requirements, it is not necessary to limit to Cu-Ni alloys. Then, about Example 11 thru | or Example 21 in 5th Embodiment about Ni-Cr type alloy,
The alloy components are shown in Table 9.

[0083]

[Table 9]

Table 10 shows these characteristics.

[0085]

[Table 10]

Even in the Ni--Cr alloy, the Ni content is 90%.
% Or less and Cr of 30% or less, Examples 11 to 13
In the case of, the relative magnetic permeability μr was μr ≦ 10, which showed a preferable temperature rise characteristic. When Cr exceeds 30%, a plate material as a sealing metal fitting for a capacitor cannot be obtained. In particular, the presence of Fe was found in Examples 12 and 13
In the above, the characteristics were shown from the comprehensive viewpoint such as the improvement of corrosion resistance. However, in the case of 94Ni-6Cr having a relative magnetic permeability of μr ≧ 100 made by the sintering method, the temperature rise value is 13 to 28K.
The temperature rise characteristics were inferior (Comparative Example 8).

Further, also in the high nickel chromium type steel, when Ni is 50% or more, Cr is 18 to 30%, and the balance Fe is 1% or more, μr ≦ 10, which shows preferable temperature rising characteristics. It also showed good corrosion resistance as a sealing metal fitting for capacitors.

Further, also in the austenitic stainless steel, as shown in Examples 14 to 17, Ni is 6 to 28%, Cr is 16 to 26%, and Fe is 7%.
When it was 5% or less, μr ≦ 10, which was a preferable temperature rise characteristic. Moreover, when Mo was added to this in a condition of 1% or more, further corrosion resistance was exhibited as a sealing metal fitting for a capacitor as shown in Example 18.

As Example 19, 8Ni-18C was used.
After elevating the r-Fe alloy to a predetermined sealing metal fitting, Cu plating was performed, and brazing was performed with an alumina insulator in which Mo or Mn was metallized in the same manner. Furthermore, there was no problem in the characteristics of the capacitor.

As Example 20 and Example 21, 55N
The i-Cu alloy is processed into a predetermined shape, and the alumina insulator is made of T
Metallization using i was performed. These are brazed together,
When evaluated as a capacitor, it showed good characteristics as in the above-mentioned examples.

When the 55Ni-Cu alloy and the alumina insulator were joined with Ag-Cu-Ti solder containing Ti, they could be joined to the alumina insulator without metallization, and the capacitor had sufficient characteristics. It is a thing.

As described above, in the capacitors according to the first to fifth embodiments, between the current-carrying portion and the ceramic, the ceramic and the metal container in the terminal portion where the power introduction terminal is taken out through the insulator. As a sealing metal fitting to be interposed in, the relative magnetic permeability μr at room temperature after sealing is about 1
Or, the material of 1 ≦ μr ≦ 10 is selected and used, and the sealing part is metallurgically bonded.
Or, even if it is placed in an alternating magnetic field due to harmonics, it is hardly affected by it. Therefore, it is possible to suppress the magnetostriction vibration and the heat generation phenomenon in the vicinity of the power introduction terminal, and obtain a capacitor excellent in high ripple response.

Next, an embodiment of the metal container 8 will be described. First, in the sixth embodiment, as the material of the metal case 8 of the capacitor 5, the relative magnetic permeability μr is 1 ≦ μr ≦
The material of No. 10 is used, and the metal case 8 is a nickel-copper alloy in which Ni is 25 to 70% by weight and the balance is substantially Cu.

The sixth embodiment of the present invention will be described below with reference to Examples 22 to 24 and Comparative Examples 8 to 12. As shown in Table 11, first, as materials for the metal case 8, a steel plate (Comparative Example 8), a tin plate (Comparative Example 9), and a brass plate (Comparative Example 10) are prepared. Further, as the material of the metal case 8, 15Ni-Cu (Comparative Example 11), 25Ni-Cu (Example 22), 55Ni-.
Cu (Example 23), 70Ni-Cu (Example 24),
80Ni-Cu (Comparative Example 12) was prepared.

[0095]

[Table 11]

Then, an insulator 10 made of 92% alumina whose surface is Mo-Mn metallized is attached to a metal lid which is a part of the metal case 8. With this insulator 10, C
The power introduction terminal 11 made of u is connected to the capacitor body 9,
A sealing metal fitting made of Kovar was arranged at the mounting and sealing portion of the insulator 10 to the metal case 8. Then, 16 capacitor unit elements 12 were mounted in the metal case 8 and a predetermined insulating oil was injected into the metal case 8 to obtain an experimental capacitor. These characteristics are shown in Table 12.

[0097]

[Table 12]

In Table 12, the relative permeability μr is the relative permeability at room temperature after sealing. The temperature rise value is a temperature rise value at a substantially central portion of the metal case plate for the capacitor, and is a substantial temperature rise value (K) obtained by subtracting the ripple current value 120A, the frequency 1 KHz, and the ambient temperature value. Corrosion resistance is
In the salt spray test, the sample was left for 720 hours at an ambient temperature of 75 ° C. Weldability is an evaluation of the bleeding condition of insulating oil. The adaptability is the adaptability as a metal case for capacitors, and the mark ○ means pass.

First, the relative permeability is evaluated. Table 1
As can be seen from FIG. 2, the relative magnetic permeability μr of these metal case materials is μr = 1 or almost 1, or 1 ≦ μ in Comparative Examples 10 and 11, and Examples 22 to 24.
r ≦ 10. Further, in Comparative Example 8, Comparative Example 9 and Comparative Example 12, μr ≧ 10 to 100.

Next, regarding the temperature rise value, a predetermined voltage was applied across the experimental capacitor, and the ripple current 120
A peak and a frequency of 1 KHz were repeatedly injected. At that time, a thermocouple was attached to the surface of the side surface (center portion of width × height) of the metal case 8 and the temperature rise value (substantial temperature rise minus ambient temperature) of this portion was measured.

Regarding the judgment of corrosion resistance, the ambient temperature is 75 ° C.
The state of damage on the surface of the metal case 8 was observed when left for 720 hours in the salt spray atmosphere. The case where no change was observed on the surface was `` good '', the case where green or other discoloration was observed on the surface, or the occurrence of irregularities or the loss of corrosion was recognized as `` abnormal '', and the degree of the findings on the left was slight It was judged as "somewhat problem".

Regarding the weldability, the experimental capacitor was left for 720 hours in a salt spray atmosphere at an ambient temperature of 75 ° C. At that time, the surface condition of the welded portion (the welded portion that was overlapped) of the metal case 8 was evaluated, and the presence or absence of seeping of insulating oil on the surface was also evaluated. At this time, the amount of insulating oil seeping out to the welded part was evaluated by observing mainly the welded part after leaving it in a salt spray atmosphere, and the point where the insulating oil seeped out to the welded part was almost continuous. The case was evaluated as "large", the case where the bleeding point was 1 to several points / centimeter was "medium", and the case where no bleeding point was observed was evaluated as "none".

As a result of the above evaluation, as can be seen from Table 12, in the case of the steel plate (Comparative Example 8) and the tin plate (Comparative Example 9), the temperature rise value of the surface of the metal case 8 is 20 to 20. Three
The value was as high as 6K, and the variation range was large, which was not preferable. Particularly, in Comparative Example 8 and Comparative Example 9, not only the temperature rise characteristics but also remarkable surface corrosion deterioration was observed in the salt spray test. Further, in Comparative Example 8 and Comparative Example 9, a large amount of seeping out of the insulating oil onto the surface of the metal case 8 was also observed after the salt spray atmosphere test.

Brass plate (Comparative Example 10), 15Ni-Cu
In (Comparative Example 11), although no problem was observed in the temperature rise characteristics as described above, surface corrosion deterioration was observed in a salt spray atmosphere test, and bleeding of insulating oil onto the surface of the metal case 8 was also observed. It was Particularly, 15Ni-Cu (Comparative Example 11)
In addition, a small amount of insulating oil leaked out to the surface of the metal case 8 through the welded portion, and a green product was generated on the surface, which was not preferable.

Even with 80Ni-Cu (Comparative Example 12), the temperature rise value of the surface of the metal case 8 is 11 to 24K.
And a wide range of variation, which is not preferable. The corrosion resistance of the metal case material was not sufficient.

On the other hand, 25Ni--Cu (Example 22), 5
The temperature rise value of the surface of the metal case 8 made of 5Ni-Cu (Example 23) and 70Ni-Cu (Example 24) is a stable value of 0.3 to 2.6K, and the corrosion resistance and weldability are also good. Met. Therefore, they are suitable as metal cases for capacitors.

Next, a seventh embodiment of the present invention will be described. In the seventh embodiment, a material having a relative magnetic permeability μr of 1 ≦ μr ≦ 10 is used as the material of the metal case 8 of the capacitor 5, and the metal case 8 is made of N.
This is a nickel-copper alloy in which i is 25 to 70% by weight, Si is 1.0% by weight or less, and the balance is substantially Cu.

The seventh embodiment of the present invention will be described below with reference to Examples 25 to 27 and Comparative Example 13. In general, a metal case material requires a Cu-Ni plate to be widened or thinned, so that a Cu-Ni plate having improved workability in widening or thinning is required. Therefore,
In the seventh embodiment, as shown in Table 13, as a metal case material, 55Ni-Cu is basically used, and a material containing 0.4% by weight of Si (Example 25),
A material containing 1.0% by weight of Si (Example 26) and a material containing 5.6% by weight of Si (Comparative Example 13) were prepared.
% Material (Example 27) was also prepared.

[0109]

[Table 13]

Then, using each material, the size for accommodating the capacitor element is 250 × 200 × 150 m.
A metal case 8 having no metal lid of m (width x depth x height) and a bottom plate portion was produced.

In the production of this metal case 8,
The presence of 4% by weight or 1.0% by weight of Si made it possible to make the plate wider or thinner more easily. A part of the “width × height” surface (there are four surfaces) was connected by a welding method to form a metal case 8. In a part of the metal case 8, the second embodiment described above is used.
Similar to 2 to Example 24 and Comparative Examples 8 to 12, an insulator 10 made of 92% alumina whose predetermined surface was Mo—Mn metallized, and a power introduction terminal 11 made of Cu,
A metal lid having a sealing metal fitting made of Kovar was attached. This metal lid was also made of the same material as the metal case 8.
Then, 16 capacitor unit elements 12 were mounted in the metal case 8 and a predetermined insulating oil was injected into the metal case 8 to obtain an experimental capacitor. These characteristics are shown in Table 14.

[0112]

[Table 14]

The relative magnetic permeability μr of these metal case materials is
μr = 1. Further, no decrease in weldability was observed due to the addition of Si.

When a predetermined voltage is applied to both ends of the capacitor unit element 12, the ripple current is 120 A peak, and the frequency is 1.
Repeated injections of KHz. Examples 22 to 24,
Under the same conditions as in Comparative Examples 8 to 12, the metal case 8 was used.
The temperature rise value in the substantially central portion of the "width x height" surface of was measured. As a result, when the Si amount is 1% by weight or less (Examples 25 to 27), the values are almost the same 0.3 to 1.0.
It was within the range of (K), and the temperature rising characteristics were favorable.

In addition, although there was no problem in the corrosion resistance test in any case, a material having a Si content of 5.6% by weight (Comparative Example 13).
In the case of No. 3, cracks were observed during the plate working operation for obtaining the material as the metal case 8, especially during cold working, which was not preferable as the metal case plate material for capacitors. Moreover, seeping-out of the insulating oil was observed mainly in the vicinity of the crack.

Therefore, from the viewpoint of obtaining a metal case plate material for a capacitor, considering the workability, the upper limit of the amount of Si for the improvement of the Ni-Cu system is 1% by weight or less.

Next, an eighth embodiment of the present invention will be described. In the eighth embodiment, a material having a relative magnetic permeability μr of 1 ≦ μr ≦ 10 is used as the material of the metal case 8 of the capacitor 5, and the metal case 8 is N
i is 25 to 70% by weight, Si is 1.0% by weight or less, Fe
And Co are 5% by weight or less and the balance is substantially Cu. Further, as the metal case 8, Ni is 25 to 70% by weight and Si is 1.0.
The nickel-copper alloy is less than or equal to 5% by weight, the total amount of Si and Mn is less than or equal to 1.5% by weight, the total amount of Fe and Co is less than or equal to 5% by weight, and the balance is substantially Cu.

The eighth embodiment of the present invention will be described below with reference to Examples 28 and 29, and Comparative Examples 14 and 15. Generally, when using a Cu-Ni-based alloy as a metal case material for a capacitor, in consideration of the special circumstances in which it is used in a more severe operating environment and operating conditions, the Cu-Ni-based alloy may also be an alloy in the Cu-Ni-based alloy depending on manufacturing conditions. Since a large amount of oxygen remains, it is necessary to further improve cold workability and hot workability, and further improve corrosion resistance. Therefore, in the third embodiment, Cu-Ni is used.
In order to further improve the workability of the system, Cu-Ni to which (Si + Mn) and (Fe + Co) were jointly added was evaluated.

That is, as shown in Table 15, 55Ni
-Cu based, (Si + Mn) 1.5 wt% and (Fe + Co) 5 wt% or less material (Example 28),
(Si + Mn) is 0.6% by weight and (Fe + Co) is 3.
3% by weight or less (Example 29), (Si + Mn) 1.5% by weight and (Fe + Co) 9.5% by weight or less (Comparative Example 14), (Si + Mn) 1.5% by weight Material with (Fe + Co) 9.2% by Weight or Less (Comparative Example 1)
5) and prepared.

[0120]

[Table 15]

As in Examples 22 to 27 and Comparative Examples 8 to 13, the metal lid which is a part of the metal case 8 was made of 92% alumina whose surface was Mo—Mn metallized. The insulator 10 is attached, the Cu power-introducing terminal 11 is connected to the capacitor body 9 by the insulator 10, and the insulator 10 is attached to the metal case 8 with a sealing metal member made of Kovar. Was placed. Then, 16 capacitor unit elements 12 were mounted in the metal case 8 and a predetermined insulating oil was injected into the metal case 8 to obtain an experimental capacitor. Table 16 shows these characteristics.

[0122]

[Table 16]

As can be seen from Table 16, in Examples 28 and 29, the relative magnetic permeability μr was 1 ≦ μr ≦ 10, and in Comparative Examples 14 and 15, the relative magnetic permeability μr was
μr ≧ 10.

A predetermined voltage was applied to both ends of the capacitor unit element 12, and a ripple current of 120 A peak and a frequency of 1 KHz were repeatedly injected. Then, the temperature rise was measured under the same conditions as in Examples 22 to 27.

In Example 28, a low temperature rise value of about 0.6 to 3.0 (K) was exhibited, and in Comparative Example 14, 3.7.
It was up to 10.1 (K) and showed a slight upward trend. Moreover, in Example 29, a low temperature rise value of about 0.7 to 3.1 (K) was exhibited, but in Comparative Example 15, 3.5 to 1
It was 3.2 (K), showing a slight upward trend. And
There was no problem in corrosion resistance.

The weldability was improved except for Comparative Example 15. The amount of Si in (Si + Mn) is 1% by weight.
When it exceeds the range, the weldability becomes poor due to the selective oxidation of Si. The presence of (Fe + Co) contributes to the improvement of corrosion resistance.

However, if the amount of Fe in (Fe + Co) exceeds 5% by weight and is added in a large amount, the corrosion thickness on the contrary becomes unfavorable because the surface roughness increases (Comparative Example 14). C
Addition of o had the same tendency. (Fe + Co) is 9.
In the case of 2% by weight, seeping out of the insulating oil was observed from a part of the welded portion, which is not preferable from the viewpoint of corrosion resistance (Comparative Example 15).

Therefore, from the viewpoint of obtaining the metal case material for capacitors, the coexisting addition range of the (Si + Mn) amount and the (Fe + Co) amount is determined, and the value is (Si + Mn) amount of 1.
It is preferably 5% by weight or less and the amount of (Fo + Co) is 5% by weight or less.

Next, a ninth embodiment of the present invention will be described. In the ninth embodiment, a material having a relative magnetic permeability μr of 1 ≦ μr ≦ 10 is used as the material of the metal case 8 of the capacitor 5, and the metal case 8 is N
i is 63 to 70% by weight, Fe is 2.5% by weight or less, Mn
Is 2.0% by weight or less, and the balance is Cu.

The ninth embodiment of the present invention will be described below with reference to Examples 30 and 31, and Comparative Examples 16 and 17. As shown in Table 17, a material containing 63% by weight of Ni, 2.0% by weight of Mn, 2.5% by weight or less of Fe, and the balance of Cu (Example 30), 63% by weight of Ni, M
n is 3.5% by weight, Fe is 5.0% by weight or less, and the balance is C
Material of u (Comparative Example 16), Ni 70% by weight, Mn 2.0% by weight, Fe 2.5% by weight or less, balance Cu (Example 31), Ni 70% by weight, Mn Is 3.5
A material (Comparative Example 17) containing wt%, Fe of 5.0 wt% or less and the balance of Cu was prepared.

[0131]

[Table 17]

Then, similar to Examples 22 to 29 and Comparative Examples 8 to 15, experimental capacitors were prepared. These characteristics are shown in Table 18.

[0133]

[Table 18]

As Examples 30 and 31, which are Cu-Ni alloys in which 2% by weight or less of Mn and 2.5% by weight or less of Fe are jointly added as metal case materials for capacitors, Examples 22 to 22 are given. When evaluated in the same manner as in Example 29, as shown in Table 18, Example 28 and Example 2
The same effect as 9 was exhibited. In particular, the temperature rise value is characteristically stable at 0.7 to 3.6 (K).

However, Comparative Example 16 containing a large amount of Mn and Fe
In the case of Comparative Example 17, the temperature rise value was allowed in terms of characteristics, but it is not preferable from the viewpoint of workability required for processing into a plate shape as a metal case material. Since the comprehensive reliability in practical use cannot be obtained, these Comparative Examples 16 and 17 are excluded.

Next explained is the tenth embodiment of the invention. In the tenth embodiment, the material of the metal case 8 of the capacitor 5 has a relative magnetic permeability μr of 1 ≦ μr ≦ 10.
The metal case 8 is used.
Is an application of a Ni-Cr alloy.

Generally, when a conventional steel plate or tin plate is used as a metal case material for a capacitor, these alloys have a fatal defect due to relative permeability μr of μr ≧ 10-100, For example, a decrease in the temperature rise characteristic can be seen. As alloys suitable for improving this, Examples 22 to 31 and Comparative Examples 8 to 1 described above are used.
In No. 7, the implementation status of the effect was evaluated for the materials to which the Cu—Ni based alloy and the improved Cu—Ni based alloy were applied.

However, the relative permeability value μr noted in the present invention
Within the specified range, and as a metal case material for capacitors, to meet requirements other than temperature rise characteristics such as workability requirements for plate-like processing and weather resistance requirements to withstand the operating environment. , Cu-Ni alloys and improved Cu-Ni
The present invention is not limited to system alloys, and Ni-Cr system alloys can also be applied. Therefore, in the tenth embodiment, Cr is 18
It is a high NiCr steel with -30% by weight and the balance being Ni.

The tenth embodiment of the present invention will be described below with reference to Examples 32 to 34 and Comparative Example 18. As shown in Table 19, Ni is 82% by weight and Cr is
18% by weight (Example 32), Ni 79% by weight, Cr 18% by weight, Fe 1% by weight, Mo 2% by weight (Example 33), Ni 61% by weight, Cr Is 2
A material containing 8 wt%, 2 wt% Fe, 9 wt% Mo (Example 34), 94 wt% Ni, and 6 wt% Cr (Comparative Example 18) was prepared.

[0140]

[Table 19]

Then, similarly to Examples 22 to 31, and Comparative Examples 8 to 17, experimental capacitors were prepared. Table 20 shows these characteristics.

[0142]

[Table 20]

Also in the Ni--Cr alloys, when Ni was 90% by weight or less and Cr was 30% by weight or less (Examples 32 to 34), μr ≦ 10, which was a preferable temperature rise characteristic. When Cr exceeds 30% by weight, a plate material as a metal case material for capacitors could not be obtained.
In particular, the presence of Fe showed a benefit from the viewpoint of improving the corrosion resistance (Example 33 and Example 34).

In the high nickel chrome steel,
When Ni is 50% by weight or more, Cr is 18 to 30% by weight, and the remaining Fe is 1% by weight or more, μr ≦ 10, which shows favorable temperature rise characteristics, and also shows good corrosion resistance as a metal case material for capacitors. It was

However, 94 wt% Ni-6 wt% Cr having a relative magnetic permeability of μr ≦ 100 made by the sintering method (Comparative Example 1
In 8), the temperature rise value was 11 to 24 (K), and the temperature rise characteristics tended to be inferior. Therefore, Examples 32 to 34 have applicability as metal case materials for capacitors.

Next, an eleventh embodiment of the present invention will be described. In the eleventh embodiment, the material of the metal case 8 of the capacitor 5 has a relative magnetic permeability μr of 1 ≦ μr ≦ 10.
The metal case 8 is used.
Is an application of an autesnite type stainless steel.

The eleventh embodiment of the present invention will be described below with reference to Examples 35 to 39. As shown in Table 21, a material containing 6 wt% of Ni, 16 wt% of Cr and the balance of Fe (Example 35), 8 wt% of Ni, 18 wt% of Cr and the balance of Fe (Example 35) 36), Ni 28% by weight, Cr 23% by weight, balance Fe material (Example 37), Ni 22% by weight, Cr 26% by weight, balance Fe material (Example 38), Ni 14% by weight, C
A material in which r was 18% by weight, Mo was 1% by weight, and the balance was Fe (Example 39) was prepared.

[0148]

[Table 21]

Then, similarly to Examples 22 to 34 and Comparative Examples 8 to 18, experimental capacitors were prepared. Table 22 shows these characteristics.

[0150]

[Table 22]

As can be seen from Table 22, even in the auteusnite type stainless steel, Ni of 6 to 28% by weight, Cr of 16 to 26% by weight, Fe of 75% by weight or less, and N of
When the total of i, Cr, and Fe is 100% by weight (Examples 35 to 38), μr ≦ 10, and 0.5 to
The preferable temperature rise characteristic of 3.3 (K) was shown. Also,
Mo is contained in this in an amount of 1% by weight or more, and Ni, Cr, Fe,
When the total amount of Mo was 100% by weight, the metal case material for capacitors also showed further corrosion resistance (Example 3).
9).

In the above description, the implementation status of the capacitor 5 in the metal case material in the alternating magnetic field of the commercial frequency or its harmonics or high frequency is shown. However, in addition to the application to the metal case 8 itself, the metal case is also applied. It goes without saying that the material of the present invention is also used for the metal lid forming a part of 8. The same applies to the use of each element such as the metal fixing plate 14. The metal case 8 referred to in the present invention includes the components of the capacitor such as the metal lid and the metal fixing plate. In addition, in the above-mentioned metal case 8, Cu
It is possible to form a coating layer containing as a main component. This protects the surface of the metal case.

[0153]

As described above, according to the present invention, the power lead-in terminal is taken out from the capacitor body inside the metal container through the insulator, and the insulator is attached to the metal container by a sealing metal fitting. Since the relative magnetic permeability μr of the sealing metal fitting of the capacitor which is joined via 1 is set to 1 ≦ μr ≦ 10, the heat generation phenomenon is low even when placed in an alternating magnetic field of commercial frequency or its harmonics or high frequencies. It is possible to provide a highly reliable capacitor.

Further, since the relative magnetic permeability of the metal case material for capacitors is set in the range of 1≤μr≤10, it has low heat generation and weather resistance even when placed in an alternating magnetic field of commercial frequency or its harmonics or high frequencies. It is possible to provide an excellent and highly reliable capacitor, and a capacitor with high ripple capability.

That is, in terms of material, the relative magnetic permeability μ at room temperature
By forming r into a capacitor component with a material in a non-magnetic state where μr = 1 or 1 ≦ μr ≦ 10,
By optimizing the composition of the material, it is possible to obtain a capacitor having weather resistance as well as having low heat generation.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a capacitor of the present invention.

FIG. 2 is an explanatory view of a metal fixing plate.

FIG. 3 is an explanatory diagram of a power conversion device to which the capacitor of the present invention is applied.

[Explanation of symbols]

 1 Single-phase power supply 2 Transformer 3 Electromagnetic switch 4 Converter device 5 Capacitor 6 Inverter device 7 Three-phase electric motor 8 Metal container 9 Capacitor element body 10 Insulator 11 Power introduction terminal 12 Unit element 13 Box-shaped corrugated press board 14 Metal fixing plate 15 Presser plate 16 Side plate

Continuation of the front page (72) Inventor Isao Okutomi 1 in Toshiba Fuchu, Tokyo Fuchu-shi, Tokyo (72) Inventor Takashi Iida 1 in Toshiba Fuchu, Tokyo Fuchu-shi, Ltd. (72) Invention Seki Kyosei No. 1 in Toshiba Fuchu factory, Fuchu-shi, Tokyo (72) Inventor Atsushi Yamamoto Atsushi Yamamoto No. 1 Toshiba town in Fuchu, Tokyo Fuchu factory (72) Inventor Hideo Suzuki Toshiba, Fuchu-shi, Tokyo No. 1 in the town of Toshiba Fuchu factory

Claims (28)

[Claims] 1. A capacitor in which a power introduction terminal is taken out from a capacitor body in a metal container through an insulator, and a mounting / seal portion of the insulator attached to the metal container is joined through a sealing metal fitting. In the above-mentioned sealing metal fitting, the relative magnetic permeability μr at room temperature after sealing is 1 ≦ μr ≦ 10.
A capacitor characterized in that the material of is selected and the sealing portion is joined by a metallurgical joining method. 2. The insulator is made of alumina ceramic as a main component, and is connected to the sealing metal member by a metalizing process by a Mo—Mn method and then by a metallurgical bonding method. The capacitor according to claim 1, wherein: 3. The insulator is made of alumina ceramic as a main component, and is connected to the sealing metal fitting after metalizing by an active metal method of Ti,
The capacitor according to claim 1, which is joined by a metallurgical joining method. 4. The capacitor according to claim 1, wherein the sealing metal member is made of a nickel-copper alloy in which Ni is 25 to 70% by weight and the balance is substantially Cu. . 5. The sealing metal fitting is made of a nickel-copper alloy in which Ni is 25 to 70% by weight, Si is 1.0% by weight or less, and the balance is substantially Cu. The capacitor according to any one of claims 1 to 3. 6. The sealing metal member comprises 25 to 70% by weight of Ni, 1.0% by weight or less of Si, 5% by weight or less of a total of Fe and Co, and the balance being substantially Cu. The capacitor according to claim 1, wherein the capacitor is made of a nickel-copper alloy. 7. The sealing metal member contains Ni in an amount of 25 to 70% by weight, Si in an amount of 1.0% by weight or less, a total amount of Si and Mn of 1.5% by weight or less, and a total amount of Fe and Co. 4. The capacitor according to claim 1, wherein the capacitor is made of a nickel-copper alloy having 5% by weight or less and the balance being substantially Cu. 8. The nickel-copper alloy comprising 63 to 70% by weight of Ni, 2.5% by weight or less of Si, 2.0% by weight or less of Mn, and the balance of 20 to 35% by weight of Cu in the sealing metal fitting. 4. The method according to claim 1, wherein
Capacitor described in. 9. The capacitor according to claim 1, wherein the sealing metal member is made of a high NiCr steel containing 50% by weight or more of Ni and 18 to 30% by weight of Cr. 10. The capacitor according to claim 9, wherein the high NiCr steel contains 1 wt% or more of Fe. 11. The capacitor according to claim 9, wherein the high NiCr steel contains 1 wt% or more of Fe and 2 wt% or more of Mo. 12. The capacitor according to claim 1, wherein the sealing metal fitting is austenitic stainless steel. 13. The austenitic stainless steel according to claim 12, wherein Ni is 6 to 28% by weight, Cr is 16 to 26% by weight, and Fe is 75% by weight or less. Capacitors. 14. The capacitor according to claim 13, wherein the austenitic stainless steel contains Mo in an amount of 1% by weight or more. 15. The sealing metal fitting comprises a coating layer containing Cu as a main component.
Capacitor described in. 16. In a capacitor in which a power introduction terminal is taken out from a capacitor body inside a metal case through an insulator, the metal case is made of a material having a relative magnetic permeability μ.
A capacitor characterized in that r is made of a material of 1 ≦ μr ≦ 10. 17. The metal case contains Ni of 25 to 70.
17. The capacitor according to claim 16, wherein the capacitor is made of a nickel-copper alloy having a weight% and the balance being substantially Cu. 18. The metal case contains Ni of 25 to 70.
% By weight, Si up to 1.0% by weight, the balance being substantially Cu
The capacitor according to claim 16, wherein the capacitor is made of a nickel copper alloy. 19. The metal case contains Ni of 25 to 70.
17. The nickel-copper alloy according to claim 16, wherein the nickel-copper alloy is composed of wt%, Si is 1.0 wt% or less, a total of Fe and Co is 5 wt% or less, and the balance is substantially Cu. Capacitors. 20. The metal case contains Ni of 25 to 70.
% Nickel, Si is 1.0 wt% or less, the total of Si and Mn is 1.5 wt% or less, the total of Fe and Co is 5 wt% or less, and the balance is substantially Cu. The capacitor according to claim 16, wherein the capacitor is composed of 21. Ni in the metal case is 63 to 70.
%, Fe 2.5% by weight or less, Mn 2.0% by weight
The capacitor according to claim 16, wherein the balance is made of a nickel-copper alloy composed of Cu. 22. The metal case contains Cr of 18 to 30.
17. The capacitor according to claim 16, wherein the capacitor is made of a high NiCr steel having a weight% and the balance being Ni. 23. The metal case contains Cr of 18 to 30.
The high NiCr steel containing at least 50% by weight, at least 50% by weight of Ni, at least 1% by weight of Fe, and having a total content of Cr, Ni and Fe of 100% by weight, is formed of a high NiCr steel. Capacitors. 24. The metal case contains Cr of 18 to 30.
% By weight, Ni 50% by weight or more, Fe 1% by weight or more,
The capacitor according to claim 16, wherein the capacitor is made of a high NiCr steel containing Mo in an amount of 2% by weight or more and the total amount of Cr, Ni and FeMo being 100% by weight. 25. The metal case is made of austenitic stainless steel.
Capacitor described in. 26. The austenitic stainless steel of claim 25, wherein the metal case is composed of 6 to 28% by weight of Ni, 16 to 26% by weight of Cr, and the balance of Fe. Capacitors. 27. In the metal case, Ni is 6 to 28 wt%, Cr is 16 to 26 wt%, Mo is 1 wt% or more,
26. The capacitor according to claim 25, wherein the capacitor is made of an austenitic stainless steel containing Fe in an amount of 75% by weight or less and the total amount of Ni, Cr, Mo, and Fe being 100% by weight. 28. The capacitor according to claim 16, wherein the metal case has a coating layer containing Cu as a main component.