JP2007173321A - Capacitor module and power converter employing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor module and a power converter in which generation and propagation of vibration are prevented. <P>SOLUTION: The capacitor module 1 is contigured by including: an internal module 2 where a capacitor element 21 constituted by winding a metallization film and a mold material 22 filling its periphery are arranged in an inner case 23; and an outer case 3 for containing the internal module 2 while the internal module 2 and the outer case 3 are secured with each other. Securing portion 4 of the internal module 2 and the outer case 3 is located at such a height as the distance from the center C of the capacitor element 21 in the height direction falls within 10% of the height H of the capacitor element 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a capacitor module including a capacitor element and a power converter using the same.

There is a capacitor module in which a plurality of capacitor elements formed by winding a metallized film are arranged in a case, and a gap between the capacitor elements is filled with a molding material made of resin (see Patent Documents 1 and 2).
The capacitor module is disposed as a component part of a power conversion device such as an inverter used in, for example, a hybrid vehicle or an electric vehicle.
When the capacitor module is mounted in an engine room or the like of the vehicle, the metal case is fixed to a mounting part of the engine room or the like with a bolt or the like with the capacitor module fixed in the metal case.

  However, the capacitor module may vibrate when a current is passed through the capacitor element, and the vibration may propagate to the vehicle or the like through the metal case to generate vibration noise. In particular, when the current flowing through the capacitor element becomes a large current or intermittently flows, there is a problem that the vibration is increased and a large vibration sound is generated.

JP 2004-319799 A JP 2001-52957 A

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a capacitor module and a power conversion device that suppress the generation and propagation of vibration.

A first invention is an internal module in which a capacitor element formed by winding a metallized film and a molding material filled around the capacitor element are arranged inside an inner case, and the inner module is accommodated inside. A capacitor module formed by fixing an outer case to each other,
The fixing portion between the inner module and the outer case is provided at a height position where the distance from the center in the height direction of the capacitor element is within 10% of the height of the capacitor element. It exists in a capacitor | condenser module (Claim 1).

Next, the effects of the present invention will be described.
In the capacitor module, the fixing portion between the inner module and the outer case is provided at a height position where the distance from the center in the height direction of the capacitor element is within 10% of the height of the capacitor element. is there. Thereby, it can suppress that the vibration of an internal module resulting from the vibration of a capacitor | condenser element propagates to an outer case. As a result, it is possible to suppress the occurrence of vibration as the entire capacitor module and to suppress the propagation of vibration to the outside.

This vibration suppression effect can be considered as follows.
That is, the capacitor element is formed by winding a metallized film, but when a current is passed through the capacitor element, a Coulomb attractive force is generated between the metallized films due to the accumulated charge. And when the magnitude | size of an electric current changes or an intermittent electric current flows, this Coulomb attractive force changes with time. As a result, the capacitor element vibrates in the normal direction of the metallized film, that is, in the direction orthogonal to the winding axis direction of the capacitor element.

Further, since the periphery of the capacitor element is filled with the molding material, the vibration in the direction orthogonal to the winding axis direction is also converted to the vibration in the winding axis direction. Also, the surrounding mold material vibrates due to the vibration of the capacitor element.
Here, when the capacitor element is arranged with the winding axis direction as the height direction, the vibration in the winding axis direction becomes the vibration in the height direction, and the capacitor element is arranged with the winding axis direction as the horizontal direction. In this case, the vibration in the direction orthogonal to the winding axis direction becomes the vibration in the height direction.

  And the vibration in the both ends of the height direction of a capacitor | condenser element becomes a mutually opposite phase. Therefore, it is considered that the vibration in the height direction disappears at the center of the capacitor element in the height direction, and the amplitude of the vibration increases up to a certain position as the distance from the center increases. That is, with respect to vibration in the height direction of the capacitor element, a standing wave having a certain wavelength determined by the rigidity of the capacitor element or the like is generated. The amplitude of the standing wave becomes 0 at the center, gradually increases as the distance from the center increases, and reaches the maximum amplitude at a position of a quarter of the wavelength of the standing wave.

Therefore, if the fixed part between the inner module and the outer case is arranged at a position near the center having a small amplitude, the vibration of the fixed part can be reduced and the propagation of vibration to the outer case is suppressed. can do. Even at a position slightly deviated from the center, the amplitude of the capacitor element at that position is small. Therefore, even if a fixing portion is provided at a position slightly deviated from the center, vibration propagation to the outer case can be suppressed. As described later, the effect of suppressing the vibration propagation is the “height position where the distance from the center in the height direction of the capacitor element is within 10% of the height of the capacitor element”.
Therefore, by providing the fixing portion at such a position, it is possible to suppress the generation and propagation of vibration of the capacitor module, and to suppress the generation of vibration noise.

  As described above, according to the present invention, it is possible to provide a capacitor module that suppresses generation and propagation of vibration.

According to a second aspect of the present invention, there is provided an internal module in which a capacitor element formed by winding a metallized film and a molding material filled around the capacitor element are disposed inside the inner case, and the inner module is accommodated inside. A capacitor module formed by fixing an outer case to each other,
When the wavelength of the standing wave due to the vibration of the fundamental frequency of the current flowing through the capacitor element is λ, the fixed portion between the inner module and the outer case has a distance from the center in the height direction of the capacitor element. The capacitor module is provided at a height position within 5% of the wavelength λ.

Next, the effects of the present invention will be described.
In the capacitor module, the fixing portion between the inner module and the outer case is provided at a height position where the distance from the center of the capacitor element in the height direction is within 5% of the wavelength λ. Thereby, it can suppress that the vibration of an internal module resulting from the vibration of a capacitor | condenser element propagates to an outer case. As a result, it is possible to suppress the occurrence of vibration as the entire capacitor module and to suppress the propagation of vibration to the outside.

The vibration suppressing effect can be considered in the same manner as in the case of the first invention, and the effect is large when the wavelength λ is used as a reference. This is the case where the fixed portion is provided at a “height position where the distance is within 5% of the wavelength λ”.
Therefore, by providing the fixing portion at such a position, it is possible to suppress the generation and propagation of vibration of the capacitor module, and to suppress the generation of vibration noise.

  As described above, according to the present invention, it is possible to provide a capacitor module that suppresses generation and propagation of vibration.

According to a third aspect of the present invention, there is provided an internal module in which a capacitor element formed by winding a metallized film and a mold material filled around the capacitor element are disposed inside the inner case, and the internal module is accommodated inside. A capacitor module formed by fixing an outer case to each other,
The capacitor module is characterized in that a weight-increasing portion that is heavier than other portions is provided around the fixing portion between the inner module and the outer case.

Next, the effects of the present invention will be described.
In the capacitor module, the weight increasing portion is provided around a fixed portion between the inner module and the outer case. Thereby, the vibration generated in the internal module can be attenuated in the weight increasing portion, and the vibration of the capacitor module can be suppressed.

  That is, the cause of the vibration in the capacitor module is the vibration of the capacitor element in the internal module. Therefore, the vibration of the internal module propagates to the outer case through the fixing portion between the inner module and the outer case, and propagates from the outer case to the outside. Therefore, by arranging the weight increasing part between the inner module and the outer case, which is the propagation path, and damping the vibration in the weight increasing part, the generation and propagation of the capacitor module vibration is suppressed. And generation of vibration noise can be suppressed.

  As described above, according to the present invention, it is possible to provide a capacitor module that suppresses generation and propagation of vibration.

According to a fourth aspect of the present invention, there is provided a power conversion device including the capacitor module according to any of the first to third aspects of the invention (claim 11).
ADVANTAGE OF THE INVENTION According to this invention, the power converter device which suppressed generation | occurrence | production and propagation of a vibration can be provided.

1st-3rd invention WHEREIN: The said capacitor | condenser element may arrange | position the winding axis direction as a height direction, and may arrange | position a winding axis direction as a horizontal direction.
The metallized film constituting the capacitor element is formed by evaporating a metal layer on the surface of a resin film (dielectric), for example. Examples of the resin film include resin films made of polyethylene terephthalate (PET), polypropylene (PP), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), and the like. Moreover, as a metal of a metal layer, aluminum, zinc, these alloys, etc. are mentioned.

In the first invention (invention 1), the fixing portion is provided at a height position where the distance from the center in the height direction of the capacitor element is within 3% of the height of the capacitor element. It is preferable that it is present (claim 2).
In this case, it is possible to further suppress the vibration of the internal module due to the vibration of the capacitor element from propagating to the outer case. That is, the height position where the distance from the center of the capacitor element in the height direction is within 3% of the height of the capacitor element is a position where the vibration of the internal module is further reduced. Therefore, by providing the fixing portion at such a position, it is possible to further suppress the propagation of vibration to the outer case.
As a result, it is possible to further suppress the occurrence of vibration as the entire capacitor module and further suppress the propagation of vibration to the outside.

Next, in the third invention (invention 4), it is preferable that the weight increasing portion has a specific gravity greater than that of other parts (invention 5).
In this case, the volume of the weight increasing part can be made relatively small. Thereby, the said weight increase part can be formed, without inhibiting the compactization of a capacitor module and space saving.

Moreover, the said weight increase part can also be comprised by inserting components with larger specific gravity than another site | part (Claim 6).
Also in this case, the volume of the weight increasing portion can be made relatively small, and the weight increasing portion can be formed without hindering the compactness and space saving of the capacitor module.

Moreover, the said weight increase part can also be comprised by sticking components with a larger specific gravity than other site | parts around the said fixing | fixed part (Claim 7).
In this case, the weight increase part can be easily formed.

Further, it is preferable that the fixing portion is provided at a height position where the distance from the center in the height direction of the capacitor element is within 10% of the height of the capacitor element.
In this case, it is possible to provide a capacitor module in which generation and propagation of vibrations are further suppressed by the synergistic effect of the operational effect of the first invention and the operational effect of the third invention.

Further, it is preferable that the fixing portion is provided at a height position where the distance from the center in the height direction of the capacitor element is within 3% of the height of the capacitor element.
In this case, it is possible to provide a capacitor module that further suppresses generation and propagation of vibration.

Further, when the wavelength of the standing wave due to the vibration of the fundamental frequency of the current flowing through the capacitor element is λ, the fixed portion between the inner module and the outer case is a distance from the center in the height direction of the capacitor element. Is preferably provided at a height position within 5% of the wavelength λ.
In this case, it is possible to provide a capacitor module in which the generation and propagation of vibrations are further suppressed by the synergistic effect of the operational effect of the second invention and the operational effect of the third invention.

  Next, in the fourth invention (invention 11), examples of the power converter include a DC-DC converter and an inverter. Moreover, the said power converter device can be used for the production | generation of the drive current which supplies with electricity to the alternating current motor which is motive power sources, such as an electric vehicle and a hybrid vehicle, for example.

Example 1
A capacitor module according to an embodiment of the present invention and a power converter using the same will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the capacitor module 1 of this example includes a capacitor element 21 (FIG. 6) configured by winding a metallized film 211 and a molding material 22 filled around the capacitor element 21. An internal module 2 (FIG. 4) arranged inside the housing and an outer case 3 (FIG. 5) for housing the internal module 2 inside are fixed to each other.

  As shown in FIG. 1, the fixing portion 4 between the inner module 2 and the outer case 3 has a height at which the distance from the center C in the height direction of the capacitor element 21 is within 10% of the height H of the capacitor element 21. It is provided at the position. It is more preferable that the fixed portion 4 is disposed at a height position where the distance from the center C in the height direction of the capacitor element 21 is within 3% of the height H of the capacitor element 21. Most preferably, it is the center C of the element 21 in the height direction.

  As shown in FIG. 6, the capacitor element 21 is wound on a metal film 211 formed by vapor-depositing a metal layer on the surface of a resin film (dielectric), and then pressed by two planes parallel to the winding axis direction. Configured. As shown in FIG. 4, the capacitor elements 21 are arranged in parallel inside the inner case 23 with the winding axis direction as the height direction.

  The metallized film 211 constituting the capacitor element 21 is formed by depositing a metal layer on the surface of a resin film (dielectric). Examples of the resin film include resin films made of polyethylene terephthalate (PET), polypropylene (PP), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), and the like. Moreover, as a metal of a metal layer, aluminum, zinc, these alloys, etc. are mentioned.

  Metallicon metal is thermally sprayed on both end faces of the capacitor element 21 in the winding axis direction, and the metallicon metal serves as an electrode of the capacitor element 21. As shown in FIGS. 1 and 4, a pair of bus plates 24 connected to the electrodes of the plurality of capacitor elements 21 are disposed on the upper end surface and the lower end surface of the capacitor element 21. 2 and the capacitor element 21 are molded by the molding material 22. Each bus plate 24 is connected to an external connection electrode 25.

  The mold material 22 is made of, for example, an epoxy resin or a urethane resin. The inner case 23 is made of, for example, polyethylene terephthalate (PET), polypropylene (PP), polyphenylene sulfide (PPS), polycarbonate (PC), polybutylene terephthalate (PBT), or the like.

The outer case 3 is made of a metal such as aluminum.
The inner case 22 is provided with a plurality of fixing protrusions 231 at a substantially central position in the height direction on the side surface. The position where the fixing protrusion 231 is provided is the position of the fixing portion 4, and the height at which the distance from the center C in the height direction of the capacitor element 21 is within 10% of the height H of the capacitor element 21. Position.

The fixing protrusion 231 is integrally formed with the main body of the inner case 22. The fixing protrusion 231 is provided with a bolt insertion hole 232 for inserting the bolt 42 in the vertical direction.
As shown in FIGS. 1 and 5, the outer case 3 is formed with a fixing receiving portion 31 at a position corresponding to the fixing protrusion 231 in the inner case 22. The fixing receiving portion 31 has a screw hole 311 in which the bolt 42 is screwed in the vertical direction.
The outer case 3 has an external mounting portion 32 for fixing the capacitor module 1 to a mounting site in an engine room or the like of the vehicle.

  Then, as shown in FIGS. 1 to 3, the inner module 2 is housed in the outer case 3, and the fixing protrusion 231 of the inner module 2 is placed on the fixing receiving portion 31 of the outer case 3. In this state, the bolt 42 is inserted into the bolt insertion hole 232 of the fixing projection 231 and screwed into the screw hole 311 of the fixing receiver 31. Thereby, the inner module 2 and the outer case 3 are fastened and fixed. This fastening and fixing portion is the fixing portion 4. Moreover, this fixing | fixed part 4 is formed in six places in this example. In the present example, the height position of the fixing portion 4 refers to the height position of the center of the fixing protrusion 231.

Moreover, the said capacitor | condenser module 1 is integrated as a component of a power converter device. That is, the power conversion device includes a main circuit unit that constitutes a part of the power conversion circuit, a control circuit unit that controls the main circuit unit, and a power wiring unit that receives and outputs power converted by the main circuit unit. Have. And the capacitor module 1 is integrated as a smoothing capacitor which makes the intermittent electric current input into a power wiring part a smooth direct current.
The outer case 23 becomes a part of the case of the power converter.

Next, the function and effect of this example will be described.
In the capacitor module 1, the fixing portion 4 between the inner module 2 and the outer case 3 is within a distance of 10% of the height H of the capacitor element 21 from the center C in the height direction of the capacitor element 21. It is provided at the height position. Thereby, it is possible to suppress the vibration of the internal module 2 caused by the vibration of the capacitor element 21 from propagating to the outer case 3. As a result, it is possible to suppress the generation of vibration as the entire capacitor module 1 and to suppress the propagation of vibration to the outside.

This vibration suppression effect can be considered as follows.
That is, as shown in FIG. 6, the capacitor element 21 is formed by winding a metallized film 211, but the Coulomb attractive force is generated between the metallized films 211 by the electric charge accumulated when a current is passed through the capacitor element 21. Will occur. And when the magnitude | size of an electric current changes or an intermittent electric current flows, this Coulomb attractive force changes with time. Thereby, the capacitor element 21 vibrates in a direction perpendicular to the normal direction of the metallized film 211 (the direction of the arrow X in FIG. 6), that is, the winding axis direction of the capacitor element 21 (the direction of the arrow Z in FIG. 6). It will be.

Further, as shown in FIGS. 1 and 4, since the mold element 22 is filled around the capacitor element 21, vibration in a direction orthogonal to the winding axis direction (arrow X in FIG. 6) It is also converted into vibration in the direction (arrow Z in FIG. 6). Further, the surrounding molding material 22 also vibrates due to the vibration of the capacitor element 21.
Here, since the capacitor element 21 is arranged with the winding axis direction as the height direction, the vibration in the winding axis direction becomes the vibration in the height direction.

And as shown in FIG. 7, the vibration in the both ends of the height direction of the capacitor | condenser element 21 becomes a mutually opposite phase. In the figure, a curve A and a curve B represent vibrations at the upper end and the lower end of the capacitor element 21, respectively.
Therefore, it is considered that the vibration in the height direction disappears at the center C in the height direction of the capacitor element 21, and the vibration amplitude increases up to a certain position as the distance from the center C increases. That is, with respect to the vibration in the height direction of the capacitor element 21, as shown in FIG. 8, a standing wave W having a constant wavelength λ determined by the rigidity of the capacitor element 21 and the like is generated. The amplitude of the standing wave W becomes 0 at the center C, and gradually increases as the distance from the center C increases, and reaches the maximum amplitude at a position of a quarter of the wavelength λ of the standing wave W.

Therefore, if the fixing part 4 between the inner module 2 and the outer case 3 is arranged at a position near the center C having a small amplitude, the vibration of the fixing part 4 can be reduced, and the vibration to the outer case 3 can be reduced. Can be suppressed. Even at a position slightly deviated from the center C, the amplitude of the capacitor element 21 at that position is small. Therefore, even if the fixing portion 4 is provided at a position slightly deviated from the center C, vibration propagation to the outer case 3 is suppressed. Can do. The effect of suppressing the vibration propagation is large, as described in Example 2 described later, the distance from the center C in the height direction of the capacitor element 21 is within 10% of the height H of the capacitor element 21. This is the case where the fixing portion 4 is provided at the “height position”.
Therefore, by providing the fixing part 4 at such a position, it is possible to suppress the generation and propagation of the vibration of the capacitor module 1 and to suppress the generation of vibration noise.

  Further, the fixed portion 4 is provided at a height position where the distance from the center C in the height direction of the capacitor element 21 is within 3% of the height H of the capacitor element 21, thereby causing vibration of the capacitor element 21. It is possible to further suppress the vibration of the internal module 2 from propagating to the outer case 3. That is, the height position where the distance from the center C is within 3% of the height H is a position where the vibration of the internal module 2 is further reduced. Therefore, by providing the fixing portion 4 at such a position, it is possible to further suppress the propagation of vibration to the outer case 3.

  In addition, as described above, by configuring the power converter using the capacitor module 1 that suppresses the generation and propagation of vibration, it is possible to obtain a power conversion apparatus that suppresses the generation and propagation of vibration.

  As described above, according to this example, it is possible to provide a capacitor module that suppresses generation and propagation of vibration and a power converter using the same.

(Example 2)
In this example, as shown in FIG. 9, the relationship between the standing wave W generated in the capacitor module 1 in Example 1 and the height position h and the amplitude D in the capacitor element 21 is measured.
The standing wave W was detected by detecting vibration with a frequency of 10 kHz generated in the capacitor element 21 when an intermittent current with a fundamental frequency of 10 kHz was passed. The capacitor element 21 has a length in the winding axis direction of about 100 mm, a major axis of about 60 mm, and a minor axis of about 33 mm.

The measured standing wave is shown by a curve W in FIG. As shown in the figure, the standing wave W has a height H (the length in the winding axis direction) of the capacitor element 21 with the center C (the center in the winding axis direction) in the height direction of the capacitor element 21 as the center. It has about twice the wavelength λ.
Further, the amplitude of vibration of each part of the capacitor element 21 is shown by a curve D in FIG. As shown in the figure, the amplitude D becomes maximum near both ends of the capacitor element 21 in the height direction (winding axis direction), and the amplitude D becomes 0 at the center C in the height direction (winding axis direction). The height position at which the distance from the center C in the height direction of the capacitor element 21 is within 10% of the height H of the capacitor element 21 (that is, the distance from the center C is within 5% of the wavelength λ) is: The amplitude D is 1/3 or less of the maximum amplitude.

Further, the vibration energy of each part of the capacitor element 21 is shown by a curve E in FIG. The vibration energy E is proportional to the square of the amplitude D.
As shown by the curve E, the vibration energy E is 1/10 of the maximum amplitude at a height position where the distance from the center C in the height direction of the capacitor element 21 is 10% of the height H of the capacitor element 21. Attenuates to: Further, the distance from the center C is attenuated to 1/100 or less of the maximum amplitude at a height position of ± 3% of the height H.

Therefore, from the result of this example, the height position where the distance from the center C in the height direction of the capacitor element 21 is within 10% of the height H of the capacitor element 21, or the distance from the center C is the wavelength. It can be seen that the vibration is greatly suppressed at the height position within 5% of λ. In particular, it can be seen that vibration is further greatly suppressed at a height position where the distance from the center C in the height direction of the capacitor element 21 is within 3% of the height H of the capacitor element 21.
Therefore, by providing the fixing portion 4 between the inner module 2 and the outer case 3 at such a position, it is possible to suppress the vibration of the inner module 2 from being propagated to the outer case 3, and thus the vibration of the capacitor module 1. It can be seen that the propagation of vibration to the outside can be suppressed.

(Example 3)
This example is an example of the capacitor module 1 in which the capacitor element 21 is arranged with its winding axis direction in the horizontal direction as shown in FIG.
In the capacitor module 1 of this example, the height direction of the capacitor element 21 is a direction orthogonal to the winding axis direction of the capacitor element 21.

The fixing portion 4 between the inner module 2 and the outer case 3 is provided at a height position where the distance from the center C in the height direction of the capacitor element 21 is within 10% of the height H of the capacitor element 21. . Further, the arrangement position of the fixing portion 4 is more preferably a height position where the distance from the center C is within 3% of the height H, and most preferably the center C itself.
Others are the same as in the first embodiment.

In the case of this example, the vibration in the direction orthogonal to the winding axis direction of the capacitor element 21 is the vibration in the height direction. As for the vibration in this direction, the amplitude at the center C of the capacitor element 21 becomes 0, and the amplitude at both ends increases. In this direction, it can be considered that the change in amplitude and the change in vibration energy are the same as those in the winding axis direction.
Therefore, also in the case of this example, by providing the fixing portion 4 at the position as described above, it is possible to achieve the same effects as those of the first embodiment.

Example 4
As shown in FIG. 11, this example is an example of the capacitor module 1 in which a weight increasing portion 41 having a larger weight than other portions is provided around the fixing portion 4 between the inner module 2 and the outer case 3.
That is, in this example, the weight increasing portion 41 is configured by increasing the size of the fixing receiving portion 31 of the outer case 3 that constitutes a part of the fixing portion 4.
Others are the same as in the first embodiment.

In the case of this example, the vibration generated in the internal module 2 can be attenuated in the weight increasing portion 41 and the vibration of the capacitor module 1 can be suppressed.
That is, the cause of the vibration in the capacitor module 1 is the vibration of the capacitor element 21 in the internal module 2. Therefore, the vibration of the internal module 2 propagates to the outer case 3 through the fixing portion 4 between the inner module 2 and the outer case 3, and propagates from the outer case 3 to the outside. Therefore, by arranging the weight increasing portion 41 between the inner module 2 and the outer case 3 which are the propagation paths, and damping the vibration in the weight increasing portion 41, the generation of the vibration of the capacitor module 1, Propagation can be suppressed and generation of vibration noise can be suppressed.

As described above, according to this example, it is possible to provide a capacitor module that suppresses generation and propagation of vibration.
In addition, the same effects as those of the first embodiment are obtained.

(Example 5)
This example is an example of the capacitor module 1 in which the weight increasing portion 41 is configured by inserting a part having a larger specific gravity than other parts as shown in FIG.
That is, the weight increasing portion 41 is formed by inserting a female screw member having a large specific gravity made of iron or the like into the fixing receiving portion 31 in the outer case 3. A screw hole 311 is formed in the female screw member as the weight increasing portion 41.
Others are the same as in the first embodiment.

In the case of this example, the volume of the weight increasing portion 41 can be made relatively small, and the weight increasing portion 41 can be formed without hindering the compactness and space saving of the capacitor module 1.
In addition, the same effects as those of the second embodiment are obtained.

(Example 6)
As shown in FIG. 13, this example is an example of the capacitor module 1 in which the weight increasing portion 41 is configured by pasting parts having a specific gravity larger than that of other portions around the fixed portion 4.
That is, the weight increasing portion 41 is formed by attaching a part having a large specific gravity such as iron on the outer periphery of the fixing receiving portion 31 of the outer case 3. Others are the same as in the first embodiment.
In this case, the weight increasing portion 41 can be easily formed. In addition, the same effects as those of the second embodiment are obtained.

  The aspects of Examples 4 to 6 can be combined, thereby increasing the vibration suppressing effect. The method of forming the weight increasing portion 41 is not limited to the above, and there are various methods such as increasing the size and specific gravity of the bolt 42, for example.

  Moreover, the said Examples 4-6 are applicable also to the capacitor | condenser module 1 shown in the said Example 1 or 3. FIG. That is, the fixing portion 4 between the inner module 2 and the outer case 3 is provided at the height position shown in the first or third embodiment, and the weight increasing portion 41 shown in the fourth to fifth embodiments is provided around the fixing portion 4. Can also be provided. Thereby, a further vibration suppression effect can be obtained.

(Comparative example)
This example is an example of the capacitor module 9 in which the fixing portion 94 between the inner module 92 and the outer case 93 is provided at a position greatly deviated from the center C in the height direction of the capacitor element 921 as shown in FIG.
That is, the fixing portion 94 is formed at a lateral position near the upper portion of the capacitor element 921.
Others are the same as in the first embodiment.

  In the case of this example, the fixed portion 94 is disposed at a position where the amplitude of the standing wave of vibration caused by the capacitor element 921 is large. Therefore, the vibration of the internal module 92 is easily propagated to the outer case 93 through the fixing portion 94. As a result, vibration is generated in the capacitor module 9, and the vibration is easily propagated to the outside, and vibration noise caused by the capacitor element 921 is easily generated.

FIG. 3 is a cross-sectional view of the capacitor module according to the first embodiment. FIG. 3 is a perspective view of the capacitor module according to the first embodiment. FIG. 3 is a plan view of the capacitor module according to the first embodiment. The perspective view of an internal module in Example 1. FIG. FIG. 3 is a perspective view of an outer case in the first embodiment. FIG. 3 is a perspective view of a capacitor element according to the first embodiment. FIG. 3 is a diagram illustrating vibrations at the upper and lower end portions of the capacitor element in the first embodiment. FIG. 3 is an explanatory diagram of standing waves generated in the capacitor module according to the first embodiment. The diagram which shows the energy of a standing wave, an amplitude, and a vibration in Example 2. FIG. Sectional drawing of the capacitor | condenser module in Example 3. FIG. Sectional drawing of the fixing part vicinity of a capacitor module in Example 4. FIG. Sectional drawing of the fixing part vicinity of a capacitor module in Example 5. FIG. Sectional drawing of the fixing part vicinity of a capacitor module in Example 6. FIG. Sectional drawing of the capacitor | condenser module in a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor module 2 Internal module 21 Capacitor element 22 Mold material 23 Inner case 3 Outer case 4 Fixed part

Claims (11)

An inner module in which a capacitor element formed by winding a metallized film and a molding material filled around the capacitor element are arranged inside the inner case and an outer case that houses the inner module are fixed to each other. A capacitor module comprising:
The fixing portion between the inner module and the outer case is provided at a height position where the distance from the center in the height direction of the capacitor element is within 10% of the height of the capacitor element. Capacitor module.   2. The capacitor module according to claim 1, wherein the fixing portion is provided at a height position where a distance from a center of the capacitor element in a height direction is within 3% of the height of the capacitor element. An inner module in which a capacitor element formed by winding a metallized film and a molding material filled around the capacitor element are arranged inside the inner case and an outer case that houses the inner module are fixed to each other. A capacitor module comprising:
When the wavelength of the standing wave due to the vibration of the fundamental frequency of the current flowing through the capacitor element is λ, the fixed portion between the inner module and the outer case has a distance from the center in the height direction of the capacitor element. A capacitor module characterized by being provided at a height position within 5% of the wavelength λ. An inner module in which a capacitor element formed by winding a metallized film and a molding material filled around the capacitor element are arranged inside the inner case and an outer case that houses the inner module are fixed to each other. A capacitor module comprising:
A capacitor module, characterized in that a weight-increasing part that is heavier than other parts is provided around a fixing part between the inner module and the outer case.   The capacitor module according to claim 4, wherein the weight increasing portion has a specific gravity greater than that of other portions.   6. The capacitor module according to claim 5, wherein the weight increasing portion is configured by inserting a part having a higher specific gravity than other parts.   6. The capacitor module according to claim 5, wherein the weight increasing part is configured by attaching a part having a specific gravity larger than that of other parts around the fixed part.   8. The fixing portion according to claim 4, wherein the fixing portion is provided at a height position where a distance from a center in a height direction of the capacitor element is within 10% of the height of the capacitor element. Capacitor module characterized by   9. The capacitor module according to claim 8, wherein the fixing portion is provided at a height position where a distance from a center in a height direction of the capacitor element is within 3% of a height of the capacitor element.   The fixed portion between the inner module and the outer case is the capacitor according to any one of claims 4 to 7, where λ is a wavelength of a standing wave caused by vibration of a fundamental frequency of a current flowing through the capacitor element. A capacitor module, wherein the capacitor module is provided at a height position where the distance from the center in the height direction of the element is within 5% of the wavelength λ.   It has a capacitor | condenser module as described in any one of Claims 1-10, The power converter device characterized by the above-mentioned.

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