JP7105091B2 - Magnetic device and busbar assembly having the same - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic device and a bus bar assembly having the magnetic device used for motor power control and regenerative power control inverter noise countermeasures in motor-driven vehicles such as electric vehicles and hybrid vehicles.

For example, a bus bar through which a large current flows exists in an inverter for motor power control or regenerative power control of a motor-driven vehicle such as an electric vehicle or a hybrid vehicle. In order to remove noise from the busbar, a magnetic material such as a ferrite core is installed around the busbar.

This type of bus bar is not preferable because if a hole is made in the bus bar, local heat is generated due to a local reduction in cross-sectional area. In particular, in the chassis of an electric vehicle or a hybrid vehicle in which ventilation is not expected due to the limited space around the busbar, it is desirable to avoid making holes in the busbar as much as possible, even for the purpose of positioning.

In addition, in-vehicle inverters for electric vehicles and hybrid vehicles are small, and the space around the installation is narrow. For this reason, the busbar is installed in a space with little leeway, and tends to have a complicated shape.

On the other hand, a ferrite core having an opening to be mounted on the busbar can only be manufactured in a simple shape because it is a brittle material obtained by firing. In addition, the ferrite core needs to be formed into a ring form from the beginning, since the noise removal capability is lowered when the ferrite core is divided.

Moreover, due to its brittleness, the ferrite core cannot be mechanically fastened and fixed to the chassis of an electric vehicle or the like. For this reason, the ferrite core is held by a fitting, and this fitting is attached to the chassis.

Since such work is very complicated, a type in which a ferrite core is divided into two parts, as described in Patent Document 1, is often used.
JP 2015-170747 A

However, multiple procedures were performed in a small space, such as holding the ferrite core in the brace, attaching the brace holding the ferrite core to the chassis, and inserting a pair of busbars through the brace attached to the chassis. .

For this reason, the assembly work is complicated, and errors in the type and insertion direction of the busbar are likely to occur, requiring confirmation work.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a magnetic fitting that does not require drilling holes for positioning the busbars, and a busbar assembly having the magnetic fitting. .

A magnetic body orthosis according to the present invention is a magnetic body orthosis that stores a magnetic material formed in an annular shape and is externally fitted to a pair of flat plate-shaped bus bars, in which the orthosis main body has a storage portion for storing the magnetic material; and a lid that closes the storage part in which the material is stored, the appliance main body is formed with a tubular penetrating part that is inserted into the opening of the magnetic material, and the lid is provided with a tubular penetration part that is inserted into the opening of the magnetic material. A through-hole corresponding to the through-hole is formed in a state of being attached to the main body of the device, and the through-hole and the through-hole form a through-hole into which a pair of bus bars are inserted. is formed with two pairs of leaf spring portions for sandwiching a pair of busbars inserted into the through holes from both front and back sides, and the leaf spring portions are formed with holes into which a plurality of projections protruding from the busbars are fitted. It is

Further, the hole portion of the leaf spring portion is formed in a concave groove.

Further, the dimension between the holes differs depending on the leaf spring portion.

The groove formed in the leaf spring portion has a different depth dimension depending on the formation position of the projection.

A busbar assembly according to the present invention includes a magnetic material formed in an annular shape, a magnetic device that stores the magnetic material, and a pair of flat plate-shaped busbars that pass through the through-holes of the magnetic device that stores the magnetic material. , wherein the magnetic device includes a device body having a storage portion for storing a magnetic material, and a lid for closing the storage portion in which the magnetic material is stored, and the device body includes A tubular penetrating portion is formed to be inserted into the opening of the magnetic material, and two pairs of leaf spring portions are formed on the inner surface of the penetrating portion to sandwich a pair of busbars inserted into the penetrating portion from both front and back sides. The plate spring portion is formed with a hole into which a plurality of projections formed on the busbar are fitted.

INDUSTRIAL APPLICABILITY The magnetic body fitting according to the present invention does not require a positioning hole to be formed in the bus bar, so it is possible to solve the problem of localized reduction in cross-sectional area and accompanying localized heat generation.

Further, this magnetic body fitting contains a magnetic body such as a ferrite core, so that a pair of busbars can be incorporated in advance, and when the busbar assembly is assembled, the type and insertion direction of the busbars are not mistaken. Therefore, it is possible to greatly reduce the number of operations around the busbar in an assembly plant for electric vehicles and the like.

1 is a schematic perspective view of a busbar assembly according to an embodiment of the invention; FIG. 1 is a schematic plan view of a busbar assembly according to an embodiment of the invention; FIG. 1 is a schematic front view of a busbar assembly according to an embodiment of the invention; FIG. FIG. 2 is a schematic perspective view of a device main body of a magnetic device that constitutes the busbar assembly according to the embodiment of the present invention; FIG. 4 is a schematic perspective view showing a leaf spring portion of a device main body of a magnetic device that constitutes the busbar assembly according to the embodiment of the present invention; FIG. 3 is a schematic cross-sectional view of a magnetic device that constitutes the busbar assembly according to the embodiment of the present invention; 1 is a schematic cross-sectional view of a busbar assembly according to an embodiment of the invention; FIG. 1 is a schematic perspective view of a busbar that constitutes a busbar assembly according to an embodiment of the present invention; FIG.

A magnetic body device 100 according to an embodiment of the present invention stores a magnetic material 200 formed in an annular shape, such as a ferrite core or a nanocrystalline soft magnetic core, and has a magnetic material that is extrapolated between a pair of flat plate-like bus bars 310 and 320 . A body orthosis comprising a body 100 having a storage portion 116 for storing a magnetic material 200 and a lid 120 closing the storage portion 116 in which the magnetic material 200 is stored. is formed with a cylindrical through-hole 115 to be inserted into the opening 210 of the magnetic material 200 , and the cover 120 has a through-hole 121 corresponding to the through-hole 115 when attached to the device body 110 . The through hole 115 and the through hole 121 form a through hole 130 into which the pair of bus bars 310 and 320 are inserted. A total of four leaf spring portions 117 (117RU, 117RD, 117LU, 117LD) are formed in two pairs to sandwich the busbars 310 and 320 from both sides. Holes 119RD1, 119RD2, 119LD1 and 119LD2 are formed in which four protrusions 311A, 311B, 321A and 321B are fitted respectively.

The magnetic material 200 stored in this magnetic body fitting 100 has a rectangular parallelepiped shape with an opening 210 in the center, and is formed in a ring shape as a whole. This type of magnetic material 200 is often composed of ferrite or a nanocrystalline soft magnetic material, but this is only an example, and the magnetic material brace 100 according to the present invention depends on the material of the magnetic material 200. no.

Also, as shown in FIG. 8, the pair of flat plate-shaped bus bars 310 and 320 inserted into the magnetic device 100 are formed with two projections 311A, 311B, 321A and 321B, respectively. These protrusions 311A, 311B, 321A, 321B are formed by pressing the busbars 310, 320. As shown in FIG.

Since the protrusions 311A, 311B, 321A, and 321B are formed in the busbars 310 and 320 instead of the holes for positioning, the problem of the local reduction of the cross-sectional area caused by drilling and the accompanying local heat generation does not occur. .

Further, these protrusions 311A, 311B, 321A, and 321B are formed corresponding to two holes 119RD1, 119RD2, 119LD1, and 119LD2 formed in the lower right leaf spring portion 117RD and the lower left leaf spring portion 117LD, which will be described later. It is

On the other hand, the magnetic device 100 that stores the magnetic material 200 is composed of a device main body 110 made of an insulating synthetic resin and a lid 120 made of an insulating synthetic resin. .

As shown in FIG. 4, the main body 110 of the equipment includes a rectangular front wall 111 having a rectangular tubular penetrating portion 115 protruding from the center, and a direction orthogonal to the front wall 111 from the four sides of the front wall 111. Four peripheral walls 112A, 112B, 112C, and 112D extending from each other and tongue portions 113A and 113B protruding outward from the peripheral walls 112A and 112B, which are short sides, are integrally formed.

A portion surrounded by the through portion 115, the front wall 111, and the peripheral walls 112A, 112B, 112C, and 112D functions as a storage portion 116 for storing the magnetic material 200. FIG.

The dimension of the through portion 115 protruding from the front wall 111 and the dimension of the four peripheral walls 112A, 112B, 112C, and 112D protruding from the front wall 111 are set to be substantially the same.

Two pairs of plate spring portions 117 are formed on the inner surface of the penetrating portion 115 on opposite long side portions, for a total of four leaf spring portions 117 . In FIG. 3, an upper right leaf spring portion 117RU and a lower right leaf spring portion 117RD are formed on the right side, and an upper left leaf spring portion 117LU and a lower left leaf spring portion 117LD are formed on the left side.

The upper right plate spring portion 117RU, the lower right plate spring portion 117RD, the upper left plate spring portion 117LU, and the lower left plate spring portion 117LD are formed in a cantilevered state from the penetrating portion 115 on the open end side of the storage portion 116 .

As shown in FIG. 5, two holes 119RD1, 119RD2, 119LD1, and 119LD2 are formed in the front and back directions in the lower right leaf spring portion 117RD and the lower left leaf spring portion 117LD, respectively. These holes 119RD1, 119RD2, 119LD1 and 119LD2 are penetrating and formed corresponding to projections 311A, 311B, 321A and 321B of buses 310 and 320, respectively.

Further, these concave grooves 118RD1, 118RD2, 118LD1 and 118LD2 correspond to protrusions 321B, 321A, 311A and 311B of busbars 320 and 310, respectively.

That is, the protrusion 321B passes through the groove 118RD1 to the hole 119RD1, the protrusion 321A passes through the groove 118RD2 to the hole 119RD2, the protrusion 311A passes through the groove 118LD1 to the hole 119LD1, and the protrusion 311B They pass through the grooves 118LD2 and are fitted into the holes 119LD2.

Therefore, the depth dimension of each concave groove 118RD1, 118RD2, 118LD1 and 118LD2 corresponds to the position where each protrusion 321B, 321A, 311A and 311B is formed.

Specifically, the grooves 118RD2 and 118LD1 have the same depth, and the grooves 118RD1 and 118LD2 have the same depth.

Moreover, the depth dimension of the grooves 118RD2 and 118LD1 is set larger than the depth dimension of the grooves 118RD1 and 118LD2.

In this way, since the grooves 118RD1 and 118RD2 formed in the lower right leaf spring portion 117RD are set to have different lengths, the insertion direction of the bus bar 310 is not mistaken. The same applies to the left lower leaf spring portion 117LD.

Further, in the lower right leaf spring portion 117RD and the lower left leaf spring portion 117LD, the grooves 118RD1 and 118RD2 and the grooves 118LD1 and 118LD2 are reversed in arrangement on the left and right. You can't go wrong.

The upper right leaf spring portion 117RU and the upper left leaf spring portion 117LU are not formed with grooves corresponding to the concave grooves 118RD1, 118RD2, 118LD1, and 118LD2.

Holes 119RD1, 119RD2, 119LD1, and 119LD2 are formed in the grooves 118RD1, 118RD2, 118LD1, and 118LD2, into which projections 321B, 321A, 311A, and 311B protruding from the busbars 310 and 320 are fitted.

The dimension between the two opposing leaf spring portions, that is, the dimension of the gap between the upper right leaf spring portion 117RU and the lower right leaf spring portion 117RD, and the dimension of the clearance between the upper left leaf spring portion 117LU and the lower left leaf spring portion 117LD are , is set slightly smaller than the thickness dimension of the busbars 310 and 320 to be inserted. This is to reliably hold the inserted busbars 310 and 320 by the opposing plate spring portions 117RU, 117RD, 117LU and 117LD.

Round holes 114A and 114B for screw fixation are formed in tongue portions 113A and 113B projecting outward from peripheral walls 112A and 112B, which are short sides of the device body 110, respectively.

On the other hand, the lid 120 is a substantially rectangular plate having a through-hole 121 corresponding to the through-hole 115 of the device main body 110 in the center. A protruding rib is formed on the periphery of the through-hole 121 so as to come into close contact with the periphery of the through-hole 115 when the cover 120 is connected to the device main body 110 .

Therefore, when the lid 120 is attached to the equipment main body 110, the storage part 116 is completely sealed, and the through hole 115 of the equipment main body 110 and the through hole 121 of the lid 120 are integrated to form a pair of bus bars 310, 320. is formed through-hole 130 into which is inserted.

A procedure for assembling the magnetic device 100 configured in this way will be described.

The magnetic material 200 is stored in the storage portion 116 of the device main body 110 in a state in which the through portion 115 of the device main body 110 is passed through the opening 210 of the magnetic material 200 .

In this state, the magnetic material 200 protrudes from the storage section 116 by the depth dimension of the lid 120 .

The lid 120 is attached to the device main body 110 by adhesion, and closes the storage portion 116 of the device main body 110 together with the magnetic material 200 stored therein. The magnetic material 200 is now completely housed in the magnetic device 100, as shown in FIG.

Moreover, the through-hole 130 is formed by the through-hole 121 of the lid 120 and the opening 115 of the appliance main body 110 .

A pair of bus bars 310 and 320 are inserted into the through hole 130 . 7, only one bus bar 310 is shown.

The busbar 310 is inserted between the upper left leaf spring portion 117LU and the lower left leaf spring portion 117LD, and the busbar 320 is inserted between the upper right leaf spring portion 117RU and the lower right leaf spring portion 117RD.

At this time, projections 311A, 311B, 321B, and 321A formed on busbars 310 and 320, respectively, are directed toward left lower leaf spring portion 117LD and right lower leaf spring portion 117RD.

Then, the projections 311A and 311B of the busbar 310 are fitted into the grooves 118RD1 and 118RD2 of the lower right leaf spring portion 117RD, respectively.

Also, the projections 321A and 321B of the bus bar 320 are fitted into the concave grooves 118LD2 and 118LD1 of the lower left leaf spring portion 117LD, respectively.

In other words, if the busbars 310 and 320 are mistakenly inserted, they cannot be inserted.

When bus bar 310 is fully inserted, protrusions 311A and 311B are fitted into holes 119LD1 and 119LD2, respectively.

Further, when bus bar 320 is fully inserted, protrusions 321A and 321B are fitted into holes 119RD2 and 119RD1, respectively.

Since the protrusions 311A, 311B, 311A, and 311B fit into the holes 119LD1, 119LD2, 119RD2, and 119RD1, the problem of insufficient or excessive insertion of the busbars 310 and 320 does not occur. , 320 are securely inserted into place.

In this way, a busbar assembly in which the pair of busbars 310 and 320 are inserted into the magnetic body fitting 100 is completed.

This busbar assembly is fixed in place by fixing screws using the round holes 114A and 114B of the tongue portions 113A and 113B.

The busbar assembly is assembled by inserting the busbars 310 and 320 into the magnetic device 100 in which the magnetic material 200 is stored. facilitated.

At the assembly plant, it is only necessary to fix the assembled busbar assembly to a predetermined position on the chassis of the electric vehicle or the like. It is possible to prevent misorientation.

Note that if the busbar assembly is such that the busbars 310 and 320 are incorporated in the magnetic device 100 from the beginning, confirmation work is not required at the assembly factory.

In the above-described embodiment, by changing the depth of each of the holes 119RD1, 119RD2, 119LD1 and 119LD2, that is, the depth dimension of the concave grooves 118RD1, 118RD2, 118LD1 and 118LD2, misinsertion of the busbars 310 and 320 can be prevented. However, the recessed grooves 118RD1, 118RD2, 118LD1, and 118LD2 have the same depth dimension, and the dimensions between the holes 119RD1, 119RD2, 119LD1, and 119LD2 are changed to prevent misinsertion of the busbars 310 and 320. is also possible.

In the method of changing the depth dimension of the recessed grooves 118RD1, 118RD2, 118LD1, 118LD2, insertion errors can be discovered only after the busbars 310, 320 are inserted in the final stage. Since the wrong busbar cannot be inserted by changing the dimension between the busbars, the insertion error can be detected at the initial stage of insertion, which makes it possible to further improve the efficiency of the work.

Further, in the above-described embodiment, each of the holes 119RD1, 119RD2, 119LD1, and 119LD2 penetrates, but they may be recesses into which the projections 311A, 311B, 321A, and 321B can be fitted. .

In the above-described embodiment, the holes 119RD1, 119RD2, 119LD1, and 119LD2 are formed in the grooves 118RD1, 118RD2, 118LD1, and 118LD2. It is also possible to simply form the holes 119RD1, 119RD2, 119LD1, 119LD2 without forming the corresponding ones.

However, there is an advantage that the insertion of the busbars 310 and 320 becomes smoother when the concave grooves 118RD1, 118RD2, 118LD1 and 118LD2 are formed.

REFERENCE SIGNS LIST 100 magnetic device 110 device main body 115 through portion 116 storage portion 117 leaf spring portion 118 concave groove 119 hole portion 120 lid body 121 through hole 130 through hole 200 magnetic material 310, 320 bus bar

Claims (5)

In a magnetic device that stores a magnetic material formed in an annular shape and is externally fitted to a pair of flat plate-shaped bus bars, The apparatus includes a device body having a storage section for storing the magnetic material, and a lid body for closing the storage section in which the magnetic material is stored, and the device body has a tubular shape to be inserted into the opening of the magnetic material. A through-hole is formed in the lid body, and a through-hole corresponding to the through-hole is opened in the lid when attached to the appliance body, and a pair of bus bars are inserted between the through-hole and the through-hole. Two pairs of leaf spring portions are formed on the inner side surface of the through-hole to sandwich the pair of busbars inserted into the through-hole from the front and back surfaces, and the leaf spring portions protrude to the busbars. A magnetic orthosis, characterized in that a hole is formed in which a plurality of formed projections are fitted. 2. The magnetic device according to claim 1, wherein the hole of the plate spring portion is formed in a concave groove. 3. The magnetic orthosis according to claim 1, wherein the dimension between the holes differs depending on the plate spring portion. 4. The magnetic device according to claim 1, wherein the recessed groove formed in the leaf spring portion has a different depth dimension depending on the formation position of the projection. A magnetic material formed into a ring and a magnetic device that stores the magnetic material, and a pair of flat plate-shaped bus bars that penetrate through the through-holes of the magnetic device that stores the magnetic material, and the magnetic device stores the magnetic material. and a cover that closes the storage portion in which the magnetic material is stored. Two pairs of leaf spring portions are formed on the inner side surface of the through portion for sandwiching the pair of busbars inserted into the through portion from both front and back sides. A busbar assembly, characterized in that a hole is formed into which a plurality of protrusions are fitted.

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