JPWO2018012144A1 - Railway vehicle power conversion device and railway vehicle - Google Patents

Abstract

Railcar power converter that reduces the amount of electromagnetic noise radiation, especially the electromagnetic noise radiation down the vehicle body, which is a problem inherent to railcar power converters, without increasing the overall weight of the equipment or reducing the equipment space I will provide a.
A chassis mounted under the floor of a railway vehicle and having an opening on the side surface and painted, a painted cover covering the opening, and a plurality of the covers on the side surface of the casing. The power converter for a railway vehicle includes a bolt to be fastened at the same time, a power converter accommodated by the casing and the cover, and an electric device, and the cover is electrically connected to the casing at a plurality of locations. Moreover, the part which electrically connects a cover and a housing | casing is made into the downward direction of a cover.

Description

  The present invention relates to a power conversion device for a rail vehicle and a rail vehicle including the power conversion device.

  When converting AC power to DC power or converting DC power to AC power in a railway vehicle power converter, a high-frequency current due to switching flows through the main circuit. When this high-frequency current flows through the conductor of the main circuit, this conductor becomes an antenna and radiates electromagnetic waves (hereinafter referred to as electromagnetic noise) to the surroundings.

The main circuit includes a painted conductor (hereinafter referred to as a casing) having an opening on the side surface and a removable and coated conductor (hereinafter referred to as a cover) covering the side opening of the casing. ).
As a feature of the housing and the cover that accommodates the main circuit, the cover can be removed for maintenance of the internal electrical components. Therefore, there is a minute gap (hereinafter referred to as a slit) between the two conductors, and both the housing and the cover are coated. Has occurred.
Since the structure having a potential difference with the slit (a shape in which an opening is provided in the housing) is equivalent to a slot antenna, electromagnetic noise generated inside the housing is radiated outside the housing without being shielded.

  Here, electromagnetic noise is radiated from the railway vehicle power converter installed under the floor of the railway vehicle, and there is a problem that affects the track side equipment such as the signal device transponder. From such a background, it is required to consider the adverse effects of electromagnetic noise radiation from the railway vehicle power converter.

In view of this point, conventionally, a method of providing a shield plate between the housing and the cover and a method of grounding the cover and the housing have been implemented. For example, there is a technique described in Japanese Patent Laid-Open No. 2009-119938 (Patent Document 1) in order to reduce the amount of radiation of electromagnetic noise itself.
This Patent Document 1 states that “in a railway vehicle control device mounted under the floor of a railway vehicle, a hook is provided inside the inspection cover for sealing the device so that an unintended inspection cover cannot be opened and closed. There is a description that “two kinds of effects of noise leakage prevention are obtained by contacting the housing side”.

JP 2009-119938 A

However, in any of the two methods described above, parts for electromagnetic noise countermeasures must be provided to the power conversion device, and there is a problem in that the assemblability deteriorates due to an increase in the number of parts.
Further, in the method of providing the shield plate, a problem of weight increase of the entire apparatus, for example, in the method of Patent Document 1, a problem of reduction of the wearing space occurs.

  Therefore, the present invention provides a technique that can solve these problems and can reduce the amount of electromagnetic noise emitted, particularly the amount of electromagnetic noise emitted downward to the vehicle body, which is a problem inherent to power conversion devices for railway vehicles. With the goal.

In order to solve the above-described problems, the present invention electrically connects a housing and a cover at a plurality of locations.
For example, one of the representative railway vehicle power converters of the present invention includes a housing that contains a device including a power converter, a cover that covers an opening formed on one side of the housing, In the railway vehicle power converter comprising the fastening member for fastening the housing and the cover,
The housing and the cover are each composed of a conductive member including a portion that has been subjected to an insulating coating and a non-insulating coating portion that has not been subjected to an insulating coating,
The fastening member electrically connects the housing and the cover at the uninsulated coating portion between the housing and the cover.

According to the present invention, electromagnetic noise can be blocked, and the problem of weight gain of the entire apparatus can be corrected.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the power converter device for rail vehicles which shows Example 1 of this invention. The front view of the power converter device for rail vehicles in FIG. XX sectional view taken on the line in FIG. FIG. 3 is a cross-sectional view taken along line YY in FIG. 2. The block diagram at the time of mounting the power converter device for rail vehicles of this invention in a rail vehicle. The conceptual diagram of a slot antenna. The perspective view explaining an electromagnetic noise analysis model. The characteristic view which shows the shielding effect with respect to conduction | electrical_connection space | interval. Sectional drawing (arrow sectional drawing in the XX line location in FIG. 2) which shows Example 2 of this invention and shows the power converter device for rail vehicles which attached the finger between the housing | casing and the cover. Sectional drawing of the principal part in the power converter device for rail vehicles which attached the finger between the housing | casing and the cover (arrow sectional view in the YY line location in FIG. 2). Sectional drawing which shows the structure of a finger attachment location in detail.

  Hereinafter, examples will be described with reference to the drawings.

  1 to 8 are diagrams showing a first embodiment of the present invention, in which FIG. 1 is a perspective view of a power converter for a railway vehicle, FIG. 2 is a front view of the power converter for a railway vehicle, and FIG. Fig. 4 is a cross-sectional view taken along line XX in Fig. 2, and Fig. 4 is a cross-sectional view taken along line YY in Fig. 2.

  The railway vehicle power converter 1 (hereinafter referred to as a power converter) includes a housing 2, a cover 3, a cooler 4, a fastening member 5, a power converter 6, an electric device 7, and the like.

  The housing | casing 2 consists of an electroconductive member, for example, is formed in metal box shape, and has the opening part 21 in the one side surface. The opening 21 is used for inserting / removing a power conversion unit 6, an electric device 7, and the like, which will be described later, into and out of the housing 2 for mounting or maintenance.

  The cover 3 is made of a conductive member as in the case 2 and is attached by the fastening member 5 so as to cover and close the opening 21 of the case 2 as shown in the figure.

Both the housing 2 and the cover 3 have a painted portion (also referred to as a painted portion) whose surface is coated with an insulating coating and an unpainted portion (also referred to as an unpainted portion) where the insulating coating is not performed. The unpainted portion is also an electrical connection portion that fastens the housing 2 and the cover 3.
The fastening member 5 is composed of, for example, a plurality of bolts (hereinafter referred to as bolts 5), and has a function of fastening the cover 3 to the housing 2, and the cover 3 and the housing 2 are not coated with insulation. It has the function of being electrically connected at the part.

  The cooler 4 is attached to one side surface facing the opening 21 of the housing 2 and cools the heat generated from the power converter 6.

  The power conversion unit 6 is accommodated inside the housing 2 and attached so as to face the cooler 4. The electric device 7 is accommodated inside the housing 2 and attached to, for example, the bottom of the housing 2, a ceiling portion, or a side surface portion.

  The power conversion unit 6 has a function of converting AC power into DC power, or converting DC power into AC power. Such a function is performed by switching. Electromagnetic noise and heat are generated during conversion in this switching.

  This heat is dissipated by the cooler 4 as described above. On the other hand, electromagnetic noise is radiated from the slits 8 (three in this example, see FIG. 4) formed between the opening 21 of the housing 2 and the cover 3.

  FIG. 5 is a diagram showing a schematic configuration when the railway vehicle power conversion device 1 of the present invention is mounted on the vehicle body 9 of the railway vehicle.

  The power conversion device 1 is installed under the floor of the vehicle body 9, and the vehicle body 9 is located on the track 10. In addition, a signal device transponder ground unit 11 is installed on the track 10. The ground unit 11 is a device installed in the track to control the operation of the train. For example, in the operation control device such as ATS (Automatic Train Stop), the vehicle unit and information mounted on the railcar. Are sent and received.

When electromagnetic noise is radiated from the slit 8 of the power conversion device 1, the ground element 11 disposed on the lower side may malfunction due to the electromagnetic noise.
Therefore, when the ground element 11 malfunctions due to the electromagnetic noise radiated from the slit 8, the influence on the safety of vehicle operation is great. For this reason as well, there is a strong demand to reduce the electromagnetic noise radiated from the slit 8, particularly the electromagnetic noise radiated downward of the vehicle body.

Here, let us consider that electromagnetic noise is radiated from the slit 8.
In general, the power conversion device 1 for a railway vehicle is used under a condition where it is exposed to rain and wind, and thus is coated to prevent rust and corrosion. The housing 2 and the cover 3 are similarly coated conductors and are electrically insulated.
For this reason, a potential difference is generated between the two conductors (the casing 2 and the cover 3). Therefore, the structure having the potential difference with the slit 8 between the two conductors is equivalent to the slot antenna. That is, the housing 2 and the cover 3 include the slit 8 and form a configuration similar to that of the slot antenna. For this reason, electromagnetic noise generated inside the housing 2 (inside the housing) is radiated to the outside of the housing 2 (outside the housing) through the slit 8 without being shielded.

FIG. 6 is a diagram illustrating the concept of the slot antenna.
The magnetic field intensity of the electromagnetic noise radiated from the slot antenna can be expressed by the following formula 1.

The slot antenna is an antenna in which an elongated groove 62 is cut in a wide conductor plate 61 as shown in FIG.
Here, the elongated shape of the elongated groove 62 indicates that the length in the x direction is sufficiently larger than the length of the groove 62 in the z direction.

  The gap (slit 8) between the two conductors of the housing 2 and the cover 3 is very small with respect to the longitudinal dimension of the power converter 1, as shown in FIG. From this, it can be considered as equivalent to a state in which a groove is cut in a wide conductor plate as in the case of the slot antenna, and can be considered as equivalent to a slot antenna.

The magnetic field strength H, which is the strength of electromagnetic noise, is proportional to the slit length slit and the potential difference V as shown in the above formula 1.
Therefore, the amount of electromagnetic noise can be reduced by reducing the potential difference by electrically connecting the housing 2 and the cover 3 or by shortening the length of the slit 8.

In the present embodiment, the electrical connection between the housing 2 and the cover 3 is performed at the bolt fastening portion of the housing 2 and the cover 3 that are not painted.
Therefore, when the casing 2 and the cover 3 are painted, for example, the coating is performed after preparing the paint so that the bolt fastening portion (electrical connection portion) of the bolt 5 is not coated with a masking tape or the like.

  In this embodiment, the point to be noted is that an unpainted portion (unpainted portion) is exposed to the outside, so that water may enter through the gap (slit 8) and cause electric corrosion. Therefore, when carrying out the present embodiment, a shielding tape or the like is preferably applied to an unpainted portion (unpainted portion) to prevent electrolytic corrosion.

  Since the casing 2 and the cover 3 are fastened by a plurality of bolts 5 at a plurality of locations, the effect of reducing the potential difference by implementing the above electrical connection at all the bolt fastening locations and the slit 8 Since the effect of reducing the size is obtained, the effect of reducing the radiation amount of electromagnetic noise can be obtained.

  The radiation noise reduction effect of electromagnetic noise due to this electrical connection can be confirmed by performing numerical analysis. The examination result will be described with reference to FIGS.

  FIG. 7 is a diagram illustrating an electromagnetic noise analysis model, and FIG. 8 is a characteristic diagram illustrating a shielding effect with respect to a conduction interval.

  The electromagnetic noise analysis model described above is filled with the case metal except for the slits 8 on the bottom side of the case 2 and the cover 3, and the electromagnetic noise radiated downward from the inside of the case through the slits 8 is to be analyzed. It is said.

An analysis region 12 is provided at an arbitrary position from directly below the slit 8, and a magnetic field distribution in the region is calculated.
The characteristic diagram shown in FIG. 8 shows an analysis result when the length of the slit 8 (position of the fastening member 5) is changed, and the analysis result is the case 2 and the cover in the above analysis model. 3 shows the shielding effect (dB) obtained when the conduction interval (mm) is changed with respect to the case where electrical connection 3 is not performed.

The electromagnetic noise of interest here is a position 0.5 m from directly below the slit 8 and a frequency of 100 kHz. As a shielding effect, if it is 20 dB or more, the electromagnetic noise radiated | emitted from the inside of a housing | casing can be restrained small enough with respect to another noise.
For this reason, from the analysis result of FIG. 8, the conduction interval is desirably 0.75 m or less.

FIGS. 9-11 is a figure which shows Example 2 of this invention, Comprising: FIG.9 and FIG.10 is in the power conversion apparatus 1 for rail vehicles which attached the finger 13 between the housing | casing 2 and the cover 3. FIG. FIG. 11 is a cross-sectional view showing the configuration of the main part of the finger 13.
In this example, fingers 13 as shown in the figure are added to portions that are electrically connected at a plurality of locations.

  The tip of the housing 2 on the opening 21 side forms an L-shaped protruding piece (bending portion) 22 protruding toward the cover 3 as shown in FIG. The cover 3 has an inner cover 31 attached so as to be in close contact with the inside of the cover 3. A lower end portion of the inner cover 31 forms a protruding piece (bending portion) 311 facing the protruding piece 22 of the housing 2.

The finger 13 is made of a conductive member, and may have, for example, a U-shaped structure that is attached to the protruding piece 311 of the inner cover 31 as illustrated. The finger 13 has a portion that contacts the protruding piece 22 of the housing 2 reliably, that is, a so-called contact. Thereby, a contact effect can be heightened.
Moreover, it is good to provide the packing 15 between the housing | casing 2 and the cover 3 (inclusive cover 31). The packing 15 prevents rainwater and the like from entering the inside of the housing 2.

In the present embodiment, as shown in FIG. 11, the power conversion device 1 has the finger 13 attached to the bent portion provided in the inner cover 31 inside the cover 3, and the housing 2 is also provided with a bent portion. Therefore, the finger 13 comes into contact with the housing 2 by attaching the cover 3 to the housing 2.
Here, as in the first embodiment, it is necessary to leave the portion where the finger 13 on the cover 3 is attached and the portion (unpainted portion) in contact with the finger 13 on the housing 2 being unpainted.

  In Example 1 described above, there was a risk that water could enter the unpainted part and cause electric corrosion, but in this Example 2, the unpainted part is inside the packing 15 and water does not enter, Reduces the risk of electrical corrosion.

  The electrical connection by the above-described finger 13 can provide the same effects as those of the first embodiment. Moreover, it can also implement in combination with not coating in the bolt fastening part of Example 1.

  For example, the slit 8 can be made small if the finger 13 is arranged as shown in FIG. 10 and is electrically connected also at the bolt fastening portion. In addition, if the number of electrical connection points increases, sufficient conduction can be obtained, so that the potential difference between the housing 2 and the cover 3 can be reduced, and the radiation amount of electromagnetic noise can be reduced.

Further, in FIG. 10, the finger 13 is attached in the immediate vicinity of the fastening bolt, but the position of the finger 13 is changed by changing the position of the bent portion (projecting piece 22) of the housing 2, that is, shifting vertically. It can be adjusted by changing the interval.
The advantage of such adjustment is that, as shown in FIG. 8, the shield effect due to electrical connection depends on the conduction interval, so that it is possible to consider the shield effect at the design stage of the power converter.

According to the embodiment of the present invention described above, an electromagnetic noise blocking effect can be obtained without adding a special component for blocking electromagnetic noise to the power conversion device (first embodiment).
Further, an electromagnetic noise blocking effect can be obtained by providing a small and light component for blocking electromagnetic noise (Example 2). All of the above-described ones can reduce the weight and secure the equipment space as compared with the existing electromagnetic noise blocking technology.
In addition, by electrically connecting the housing and the cover below the cover, an effect of reducing the amount of electromagnetic noise emitted downward from the vehicle body can be obtained.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for the purpose of facilitating understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of the embodiment.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Housing | casing 21 Opening part 3 Cover 31 Inner cover 4 Cooler 5 Fastening member (bolt)
6 Power conversion part 7 Electrical equipment 8 Slit (gap)
9 Car body 10 Track 11 Ground element 12 Analysis area 13 Finger 15 Packing

Claims (10)

A housing containing equipment including a power conversion unit;
A cover that covers an opening formed on one side of the housing;
A fastening member for fastening the housing and the cover;
In a railway vehicle power conversion device comprising:
The housing and the cover are each composed of a conductive member including a portion that has been subjected to an insulating coating and a non-insulating coating portion that has not been subjected to an insulating coating,
The fastening member is a power conversion apparatus for a railway vehicle, wherein the casing and the cover are electrically connected to each other at the uninsulated coating portion. In the railcar power converter according to claim 1,
The fastening member includes a plurality of bolts, and electrically connects the housing and the cover with a plurality of bolts at a plurality of locations. In the railcar power converter according to claim 1 or 2,
A connecting part for electrically connecting the casing and the cover is located below the cover. A railway vehicle power converter.   The railway vehicle which mounts the power converter device for railway vehicles described in Claim 1 under the floor of a railway vehicle. In a railway vehicle power conversion device mounted under the floor of a railway vehicle,
A housing containing a device including a power conversion unit and having an opening on one side surface;
A cover covering the opening of the housing;
A fastening member for fastening the housing and the cover;
With
The casing and the cover are electrically insulated except for a portion where the casing and the cover are fastened by the fastening member, and are not electrically insulated. Fastening with the fastening member at a location, and electrically connecting the housing and the cover with the fastening member. In the railcar power converter according to claim 5,
The fastening member includes a plurality of bolts, and electrically connects the housing and the cover with a plurality of bolts at a plurality of locations. In the railcar power converter according to claim 5 or 6,
A connecting part for electrically connecting the casing and the cover is located below the cover. A railway vehicle power converter. In a railway vehicle power conversion device mounted under the floor of a railway vehicle,
A housing containing a device including a power conversion unit and having an opening on one side surface;
A cover covering the opening of the housing;
A fastening member for fastening the housing and the cover;
In a railway vehicle power conversion device comprising:
In addition, with fingers,
The casing and the cover are subjected to electrically insulating coating, except for a portion where the casing and the cover are fastened by the fastening member.
An inner cover is attached to the inside of the cover, and a bent portion is provided at one end of the lower side of the inner cover and a tip protruding from the opening of the casing, and the bent portion of the casing and the bent portion of the inner cover are provided. The finger is attached between the bent portion and the fastening member, and the portion where the finger is attached on the cover and the portion where the finger is contacted on the housing are not electrically insulated. Unpainted part,
A power conversion apparatus for a railway vehicle, wherein the casing and the inner cover are electrically connected via the finger. In the railcar power converter according to claim 5,
The fastening member includes a plurality of bolts, and electrically connects the housing and the cover with a plurality of bolts at a plurality of locations. In the railcar power converter according to claim 8 or 9,
A connecting part for electrically connecting the casing and the cover is located below the cover. A railway vehicle power converter.

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