JP2019208051A - Shunt resistor - Google Patents

Abstract

To provide a shunt resistor capable of easily performing an adjustment to a desired resistance value without a local strength deterioration without generating an unnecessary object such as a cutting dust or die cutting piece or the like.SOLUTION: A shunt resistor comprises: a pair of electrode plates 10A separated from each other to a plate surface direction; and a resistance ally plate 20A coupling the pair of electrode plates. The resistance ally plate forms a convex part 35 in a cross-section along a direction orthogonal to a plate surface, and has a ridge part extended to a conductive direction directing from one of the pair of electrode plates to the other. All of the alloy member containing the ridge part is positioned in an inner space 90 nipped with an opposite end surface 15 of the pair of electrode plates.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a shunt resistor used for current value detection.

  The shunt resistor is a member that is connected in series to an electric circuit that is a current value detection target and that is used when detecting the current value of the circuit by measuring the voltage value on both sides of the shunt resistor. It is widely used in various fields such as a bus ring (bus bar) in a rotary motor.

  For example, in the following Patent Document 1, a thick film resistor is joined to the pair of electrode conductors so as to connect a pair of electrode conductors arranged opposite to each other on an insulating substrate, and the thick film resistor is formed by laser trimming. A method of manufacturing a shunt resistor having a desired resistance value by providing a slit has been proposed.

  In the method described in Patent Document 1, the resistance value is adjusted to a desired value by changing the length, number, and pitch of slits formed by laser trimming, but along the direction orthogonal to the plate surface. The slits are formed so as to open outward in a plan view, and therefore the strength of the slit forming portion, in particular, the bending strength in the direction orthogonal to the plate surface is weakened, and vibration that can be added in the use state There is a risk of breakage or damage due to bending stress. In particular, when the pitch of the plurality of slits is narrowed, the risk increases.

Further, when the slit is opened outward in a plan view, there is a problem that contact between the edge portion of the slit and the external peripheral member is likely to occur, and this also causes damage or damage.
Furthermore, there is a problem that scraps are generated when forming slits by laser trimming, and it is necessary to remove the scraps in a later process.

  In Patent Document 2 below, a shunt resistor is manufactured by punching and forming a resistance value adjusting hole with a first punch, and further punching and forming a shunt resistor so as to straddle the resistance value adjusting hole with a second punch. A method is described.

  However, even in the shunt resistor manufactured by this method, the notch formed by the resistance value adjusting hole is opened outward in a plan view, and therefore, the strength of the notch forming portion, in particular, the plate surface and The bending strength in the orthogonal direction is weakened, which may cause breakage or damage due to vibration or bending stress that can be applied in the use state.

Further, since the notch is opened outward in a plan view, there is a problem that the edge portion of the notch is easily brought into contact with an external peripheral member, and this is also liable to be broken or damaged.
Further, when the resistance value adjusting hole punching is formed by punching, a punched piece is generated, and it is necessary to remove the punched piece in a later process.

Japanese Patent Laid-Open No. 10-032110 JP 2011-114038 A

  The present invention has been made in view of such a conventional technique, and it is easy to adjust to a desired resistance value without causing generation of unnecessary materials such as scraps and punched pieces and without causing local strength deterioration. The purpose is to provide a shunt resistor that can be used in the future.

  In order to achieve the above object, the present invention is a shunt resistor comprising a pair of electrode plate members spaced apart from each other in the plate surface direction, and a resistance alloy plate member that connects the pair of electrode plate members, The resistance alloy plate has a flange that forms a convex portion in a cross section along a direction orthogonal to the plate surface and extends in the energization direction from one of the pair of electrode plates to the other, and includes the flange Provided is a shunt resistor in which the entire alloy member is located in a space sandwiched between opposed end surfaces of the pair of electrode plate members.

  Preferably, the resistance alloy sheet may have a plurality of the flange portions that are parallel to each other.

  According to the shunt resistor according to the present invention, adjustment to a desired resistance value can be easily performed without causing generation of unnecessary objects such as scraps and punched pieces and without causing local strength deterioration in the final form. be able to.

FIG. 1 is a plan view of a shunt resistor according to an embodiment of the present invention. FIG. 2 is a partial enlarged cross-sectional view of the shunt resistor taken along line II-II in FIG. FIG. 3 is a partially enlarged cross-sectional view of the shunt resistor taken along line III-III in FIG. FIG. 4 is a partially enlarged sectional view corresponding to FIG. 3 of a modification of the shunt resistor. FIG. 5 is a partial enlarged cross-sectional view corresponding to FIG. 3 of another modification of the shunt resistor. FIG. 6 is a schematic perspective view showing one step of the method for manufacturing the shunt resistor according to the embodiment of the present invention. FIG. 7 is a schematic perspective view showing one step of the manufacturing method performed after the step of FIG.

Hereinafter, an embodiment of a shunt resistor according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a plan view of a shunt resistor 1 according to the present embodiment.
2 and 3 are partially enlarged sectional views of the shunt resistor 1 taken along lines II-II and III-III in FIG. 1, respectively.

  As shown in FIGS. 1 and 2, the shunt resistor 1 includes a pair of electrode plates 10 and 10 that are spaced apart from each other in the plate surface direction, and a resistance alloy plate that connects the pair of electrode plates 10 and 10. 20.

The electrode plate material 10 is formed of a conductive member 10A, for example, a Cu metal plate material is preferably used.
As shown in FIGS. 1 and 2, the pair of electrode plates 10, 10 are provided with a pair of detection terminals 15, 15 so as to be positioned in the vicinity of the resistance alloy plate 20 that connects the two. ing.
In addition, the code | symbol 18 in FIG.1 and FIG.2 is the through-hole for fastening used in order to fix the said shunt resistor 1 in a predetermined position.

The resistance alloy plate material 20 is mechanically and electrically connected between the pair of electrode plate materials 10 and 10, and the resistance value is adjusted so that a desired resistance value is obtained between the pair of electrode plate materials 10 and 10. Is a member to be performed.
For example, a Cu—Mn alloy, a Ni—Cr alloy, or a Cu—Ni alloy is preferably used as the resistance alloy plate 20.

  As shown in FIGS. 1 and 3, in the shunt resistor 1, a flange 30 is provided on the surface of the resistance alloy plate 20, and the recess 30 is formed in the flange 30, thereby The resistance value between the pair of electrode members 10 and 10 is adjusted to be a desired resistance value.

The flange portion 30 forms a convex portion in a cross section along the direction orthogonal to the plate surface and extends along the energization direction X from one of the pair of electrode plate members 10 and 10 to the other.
In the present embodiment, the flange portion 30 includes three flange portions 30 (1), 30 (2), and 30 (3) that are parallel to each other.
By providing a plurality of the flange portions 30 in this way, the surface area of the resistance alloy sheet 20 can be increased and the heat dissipation can be improved.

  As the resistance alloy plate 20, an alloy member 20A such as a Cu—Mn alloy, a Ni—Cr alloy, or a Cu—Ni alloy is preferably used, and the alloy member 20A is drawn or rolled. As a result, the flange 30 is formed.

  The concave portion 35 reduces the area of the energization region defined by the cross section along the direction orthogonal to the plate surface, and the resistance value of the resistance alloy plate 20 increases as the area of the energization region decreases. .

  Therefore, whether or not to form the recess 35 in the flange 30 and when the recess 35 is formed, the size (depth) thereof is adjusted to adjust the pair of electrode plates 10 and 10. The resistance value between is increased from an initial resistance value (a resistance value between the pair of electrode plate materials 10 and 10 in a state before the concave portion 35 is formed in the flange portion 30 of the resistance alloy plate material 20) to a desired resistance value. Can do.

  In the illustrated embodiment, as described above, the resistance alloy plate member 20 has three flange portions 30 (1), 30 (2), and 30 (3), and is positioned at the center in the width direction. A concave portion 35a having a depth Da (see FIG. 3) is formed in the portion 30 (2), and a concave portion 35b having a depth Db (see FIG. 3) is shallower than Da on the flange portion 30 (1) on one side in the width direction. The recess 35 is not formed in the flange portion 30 (3) on the other side in the width direction.

  Thus, by adjusting the depth of the concave portion 35 formed in the flange portion 30, the cross-sectional area of the resistance alloy plate material 20 that defines the area of the current-carrying region is adjusted. The resistance value between 10 can be increased to a desired resistance value.

  In the present embodiment, the recess portion 35a having a depth Da is formed in the flange portion 30 (2) and the recess portion 35b having a depth Db is formed in the flange portion 30 (1). As long as the resistance value between the members 10 and 10 can be increased to a desired resistance value, the number and size (depth) of the concave portions 35 formed in the flange portion 30 can be changed.

  For example, as shown in FIG. 4, the concave portion 35c is formed only in any one of the plurality of collars 30 (1), 30 (2), 30 (3) (for example, 30 (2)). It is assumed that the depth of the recess 35c can be adjusted so that the resistance value between the pair of electrode members 10 and 10 increases to a desired resistance value.

  Alternatively, as shown in FIG. 5, a recess 35d having the same depth is formed in all of the plurality of flange portions 30 (1), 30 (2), 30 (3), and the pair of electrode members 10, 10 It is also possible to adjust the depth of the recess 35d so that the resistance value between them increases to a desired resistance value.

From the viewpoint of adjusting the area of the current-carrying region in the resistance alloy plate 20 by the recess 35, the alloy member 20A includes the flange portion 30 in a state of being connected between the pair of electrode members 10 and 10. The entire alloy member 20A is formed so as to be disposed in a space 90 (see FIG. 6 below) sandwiched between the opposed end faces 15 and 15 of the pair of electrode members 10 and 10.
According to such a configuration, the area of the energized region can be adjusted with high sensitivity by the size (depth) of the recess 35.

Hereinafter, a method for manufacturing the shunt resistor 1 according to the present embodiment will be described.
As shown in FIG. 6, the manufacturing method prepares a pair of conductive members 10A and 10A that form the pair of electrode plates 10 and 10 and an alloy member 20A that forms the resistance alloy plate 20, and the alloy member 20A, the pair of conductive members 10A and 10A are connected to form a resistor pre-assembly.

Here, the flange portion 30 is formed on the surface of the alloy member 20A in advance by wire drawing or rolling.
In addition, the alloy member 20A has the pair of conductive members 10A, 10A (the above-described pair of conductive members 10A, 10A (the pair of electrode members 10, 10) coupled to each other by the alloy member 20A). The resistance value (initial resistance value) between the pair of electrode plate members 10 and 10 has a resistance value that is smaller than a desired resistance value desired in the completed state of the shunt resistor 1.

  As described above, preferably, in a state where the pair of electrode members 10 and 10 are connected by the alloy member 20A, the entire alloy member 20A including the flange portion 30 is opposed to the pair of electrode members 10 and 10. Specifically, in a state where the pair of electrode members 10 and 10 are connected by the alloy member 20A so as to be disposed in the space 90 sandwiched between the end surfaces 15 and 15, the upper end of the flange portion 30 is The upper surfaces 11 and 11 of the pair of electrode members 10 and 10 are flush with or below the upper surfaces 11 and 11, and the bottom surface 22 of the alloy member 20 </ b> A faces the bottom surfaces 12 and 12 of the pair of electrode members 10 and 10. One or above the bottom surfaces 12 and 12, the side surface 23 of the alloy member 20A is flush with the corresponding side surfaces 13 and 13 of the pair of electrode members 10 and 10, or the side surface 1 Can to be located inward than 13, forming the alloy member.

  Next, the manufacturing method includes measuring a resistance value between the pair of conductive members 10A and 10A (the pair of electrode plate members 10 and 10) in the resistor preassembly as an initial resistance value, and an initial resistance. Calculating a difference between the value and the desired resistance value as a resistance value to be adjusted.

  The manufacturing method is configured to increase a resistance value by an amount corresponding to the resistance value to be adjusted from an initial resistance value by forming a recess 35 in the flange portion 30 in the alloy member 20A (the resistance alloy plate material 20). Has been.

  Specifically, the manufacturing method determines the size and quantity of the recesses 35 to be formed in the flange 30 so that the resistance value of the resistance alloy plate 20 is increased by the resistance value to be adjusted. A determining step and a recess forming step for forming the recesses 35 of the size and quantity determined in the recess determining step in the collar portion 30.

  Here, ascending resistance value information relating to how much the resistance value of the alloy member 20A (the resistance alloy plate 20) is increased by the size (depth) of the recess 35 formed by the recess forming member 50 is previously tested. Etc. are known.

  Therefore, in the concave portion determining step, the quantity and size (depth) of the concave portion 35 to be formed in the flange portion 30 are determined based on the resistance value to be adjusted and the rising resistance value information. .

  For example, the ascending resistance value information includes the size (depth) of the recess 35 formed in the first collar part (for example, the collar part 30 (2)) of the plurality of collar parts 30 and the ascending resistance value. The relationship and the size of the recesses 35 that are sequentially formed in the remaining flanges in the state where the upper limit (depth) recesses 35 are formed in the first flanges (for example, the flanges 30 (2)). The relationship between (depth) and the rising resistance value may be included.

  In this case, the recess determining step includes the size (depth) of the recess 35 to be formed in the first flange 30 and, if necessary, the recess 35 to be formed in the remaining flange 30. Determine the size (depth).

Instead, the rising resistance value information includes the size (depth) of the concave portion 35 and the rising resistance when the concave portion 35 having the same size (depth) is formed in each of the plurality of flanges 30. It may include a relationship with a value.
In this case, the said recessed part determination process determines the magnitude | size (depth) of the recessed part 35 formed in each of the said some collar part 30. FIG.

  In the concave portion forming step, the concave portion 35 having the quantity and size (depth) determined in the concave portion determining step is formed in the flange portion 30.

In the present embodiment, in the concave portion forming step, the concave portion 35 is formed by the concave portion forming member 50 (see FIG. 7) that is pushed in a direction orthogonal to the flange portion 30.
In this case, the size (depth) of the recess 35 is adjusted by adjusting the pushing distance of the recess forming member 50.

  According to the manufacturing method, the shunt resistor 1 having a desired resistance value can be obtained without causing generation of unnecessary materials such as scraps and punched pieces during the manufacturing process and without causing local strength deterioration in the final form. It can be manufactured easily.

That is, a shunt resistor having a desired resistance value is formed by forming slits that open outward in a plan view along a direction orthogonal to the plate surface by laser trimming, and adjusting the pitch, number, and / or length of the slits. In the conventional structure for manufacturing, the strength of the slit forming portion, particularly the bending strength in the direction perpendicular to the plate surface is weakened, and the cause of breakage or damage due to vibration or bending stress that can be applied in the usage state of the shunt resistor There is a risk of becoming.
In addition, since the slit is opened outward in a plan view, there is a problem that the edge portion of the slit is easily in contact with an external peripheral member, and this is easily damaged or damaged.
Furthermore, there is a problem that scraps are generated when forming slits by laser trimming, and it is necessary to remove the scraps in a later process.

Further, a shunt resistor having a desired resistance value is formed by punching and forming a resistance value adjusting hole with the first punch, and further punching and forming a shunt resistor so as to straddle the resistance value adjusting hole with the second punch. Even in other conventional configurations for manufacturing a container, the notch formed by the resistance value adjusting hole opens outward in a plan view, so that the strength of the notch forming portion, particularly the direction orthogonal to the plate surface There is a risk that the bending strength will be weakened, and damage or damage may be caused by vibration or bending stress that can be applied in the usage state of the shunt resistor.
Further, the edge portion of the notch is likely to come into contact with an external peripheral member, and this also causes a problem of being easily broken or damaged.
Further, when the resistance value adjusting hole is formed by punching, a punched piece is generated, and it is necessary to remove the punched piece in a later process.

  According to the manufacturing method, it is possible to easily manufacture a shunt resistor having a desired resistance value while preventing such disadvantages in the prior art.

In the shunt resistor 1, the adjusted resistance value can be ensured by checking the size (depth) and / or quantity of the recess 35 formed in the flange portion 30 in the resistance alloy sheet 20. Can be recognized.
Therefore, when the initial resistance value is known, the resistance value of the shunt resistor 1 can be reliably recognized by confirming the size (depth) and / or quantity of the recess 35.

DESCRIPTION OF SYMBOLS 1 Shunt resistor 10 Electrode board | plate material 15 Opposite end surface 20 Resistance alloy board | plate material 20A Alloy member 30 The collar part 35 Recessed part 90 Space

Claims (2)

A shunt resistor comprising a pair of electrode plates separated from each other in the plate surface direction, and a resistance alloy plate connecting the pair of electrode plates,
The resistance alloy plate material has a flange portion that forms a convex portion in a cross section along a direction orthogonal to the plate surface and extends in the energization direction from one of the pair of electrode plate materials to the other,
The shunt resistor, wherein the entire alloy member including the flange portion is located in a space sandwiched between opposed end surfaces of the pair of electrode plate members.   2. The shunt resistor according to claim 1, wherein the resistance alloy plate member has a plurality of the flange portions that are parallel to each other.

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