JP6643859B2 - Manufacturing method of shunt resistor - Google Patents

Description

  The present invention relates to a method for manufacturing a shunt resistor used for detecting a current value.

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

  For example, in Patent Document 1 described below, a thick film resistor is joined to the pair of electrode conductors so as to connect a pair of electrode conductors disposed on an insulating substrate, and the thick film resistor is connected to the thick film resistor by laser trimming. There has been proposed a method of manufacturing a shunt resistor having a desired resistance value by providing a slit.

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

Further, when the slit is opened outward in a plan view, there is a problem that the edge portion of the slit is liable to come into contact with an external peripheral member, and this is liable to breakage or damage.
Further, there is a problem that shavings are generated when the slit is formed by laser trimming, and it is necessary to remove the shavings in a subsequent process.

  Patent Document 2 below discloses a method of manufacturing a shunt resistor in which a resistance adjusting hole is punched and formed by a first punch, and a shunt resistor is punched and formed so as to straddle the resistance adjusting hole by a second punch. A method is described.

  However, also in the shunt resistor manufactured by this method, the notch formed by the resistance value adjusting hole is open outward in a plan view, and therefore, the strength of the notch forming portion, particularly, 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 added in use.

Further, since the notch is open outward in a plan view, the edge of the notch is likely to come into contact with an external peripheral member, which also causes a problem that the notch is easily damaged or damaged.
Further, there is a problem that when the resistance value adjusting hole is formed by punching, a punched piece is formed, and it is necessary to remove the punched piece in a subsequent process.

JP-A-10-032110 JP 2011-114038 A

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional technique, and is intended to reduce the strength of a shunt resistor having a desired resistance value without causing generation of unnecessary objects such as shavings and punched pieces and causing local strength deterioration. It is another object of the present invention to provide a method of manufacturing a shunt resistor that can be easily manufactured.

In order to achieve the above object, the present invention includes a pair of electrode plates separated from each other in a plate surface direction and a resistance alloy plate connecting the pair of electrode plates, and a resistance between the pair of electrode plates. A method for manufacturing a shunt resistor, the value of which is adjusted to a desired resistance value, wherein the alloy member forms the resistance alloy plate material, wherein a convex portion is formed in a cross section along a direction perpendicular to the plate surface; It has a ridge extending in the direction of conduction from one of the pair of electrode plate members to the other, so that the resistance value between the pair of electrode plate members is smaller than the desired resistance value in a state where the pair of electrode plate members are connected. a step of preparing an alloy member having a Do resistance, said a resistor pre assembly formed by connecting the pair of electrodes plate an alloy member, the whole of the pair of conductive of the alloy member including said ridge Forming a resistor pre assembly is positioned in a space sandwiched between the facing end surface of the plate material, the resistance value between the pair of electrodes plate in the resistor pre assembly, and measuring the initial resistance value, Calculating the difference between the desired resistance value and the initial resistance value as a resistance value to be adjusted, and the ridge portion so that the resistance value of the resistance alloy plate material increases by the resistance value to be adjusted. Forming a concave portion to reduce the cross-sectional area of the current-carrying region.

  Preferably, the alloy member has a plurality of the ridges parallel to each other.

  In one embodiment, the concave portion determining step includes a relationship between a size of a concave portion formed in one ridge portion of the plurality of ridge portions and a rising resistance value, and an upper limit size of the one ridge portion. In the state in which the concave portion is formed, the number and the size of the concave portion to be formed are determined based on the rising resistance value information including the relationship between the size of the concave portion sequentially formed in the remaining ridge portion and the rising resistance value. You.

  In another embodiment, when forming the recesses of the same size in each of the plurality of ridges, based on rising resistance value information including a relationship between the size of the recesses and a rising resistance value, It is configured to determine the size of the recess to be formed in each.

Further, in order to achieve the above object, the present invention includes a pair of electrode plate members separated from each other in a plate surface direction and a resistance alloy plate member connecting the pair of electrode plate members, A method for manufacturing a shunt resistor, wherein the resistance value of the shunt resistor is adjusted to a desired resistance value, the alloy member forming the resistance alloy plate material, wherein a convex portion is formed in a cross section along a direction orthogonal to the plate surface. And a plurality of ridges that are parallel to each other in a direction along which a current flows from one of the pair of electrode plates toward the other, and the pair of electrodes are connected in a state where the pair of electrode plates are connected to each other. A step of preparing an alloy member having a resistance value such that the resistance value between the plate members is smaller than the desired resistance value, and a step of connecting the pair of electrode plate members by the alloy member to form a resistor pre-assembly, Measuring a resistance value between the pair of electrode plates in the resistor pre-assembly as an initial resistance value, and calculating a difference between the desired resistance value and the initial resistance value as a resistance value to be adjusted; And a concave portion determining step of determining the size and the number of concave portions to be formed in the ridge so that the resistance value of the resistance alloy plate material increases by the resistance value to be adjusted, and the concave portion determining step. Forming a concave portion having a size and a number of concave portions in the ridge portion, the concave portion determining step, the size of the concave portion formed in one of the ridges of the plurality of ridges, the rise resistance value and Relationship, and in a state where a concave portion having an upper limit size is formed in the one ridge portion, based on rising resistance value information including a relationship between the size of the concave portion sequentially formed in the remaining ridge portion and the rising resistance value, Recess to be formed To provide a method of manufacturing a shunt resistor which is intended to determine the quantity and size.

  According to the method for manufacturing a shunt resistor according to the present invention, the difference between the desired resistance value and the initial resistance value of the shunt resistor is calculated as a resistance value to be adjusted, and the resistance alloy is adjusted by the resistance value to be adjusted. Determine the size and number of recesses to be formed in the ridge portion of the resistance alloy plate material so that the resistance value of the plate material increases, and form the recesses of the determined size and number in the ridge portion to determine the energized area. Since the cross-sectional area is reduced, a shunt resistor having a desired resistance value can be easily formed without causing generation of unnecessary objects such as shavings and punched pieces in a manufacturing process and without causing local strength deterioration in a final form. Can be manufactured.

FIG. 1 is a plan view of a shunt resistor manufactured by a manufacturing method according to an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of the shunt resistor taken along line II-II in FIG. FIG. 3 is a partially enlarged sectional view of the shunt resistor taken along the 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 partially enlarged 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 manufacturing method according to one embodiment of the present invention. FIG. 7 is a schematic perspective view showing one step of the manufacturing method according to one embodiment of the present invention, which is performed after the step of FIG.

Hereinafter, an embodiment of a method for manufacturing 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 manufactured by the manufacturing method 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, 10 spaced apart from each other in a plate surface direction, and a resistance alloy plate connecting the pair of electrode plates 10, 10. 20.

The electrode plate 10 is formed of a conductive member 10A, and for example, a metal plate of Cu 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 located near the resistance alloy plate 20 connecting the two. ing.
Reference numeral 18 in FIGS. 1 and 2 is a through hole for fastening used to fix the shunt resistor 1 at a predetermined position.

The resistance alloy plate 20 mechanically and electrically connects the pair of electrode plates 10 and 10 and adjusts the resistance value so that the pair of electrode plates 10 and 10 has a desired resistance value. Is a member for which
As the resistance alloy plate 20, for example, a Cu-Mn alloy, a Ni-Cr alloy, or a Cu-Ni alloy is preferably used.

  As shown in FIGS. 1 and 3, in the shunt resistor 1, a ridge portion 30 is provided on the surface of the resistance alloy plate 20, and a recess 35 is formed in the ridge portion 30, whereby The resistance between the pair of electrode members 10 and 10 is adjusted so as to have a desired resistance.

The ridge portion 30 forms a convex portion in a cross section along a direction orthogonal to the plate surface, and extends along a conduction direction X from one of the pair of electrode plate members 10 and 10 to the other.
In the present embodiment, the ridge 30 has three ridges 30 (1), 30 (2), and 30 (3) parallel to each other.
By providing the plurality of ridges 30 in this manner, the surface area of the resistance alloy plate 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-based alloy, a Ni-Cr-based alloy, or a Cu-Ni-based alloy is suitably used, and wire drawing or rolling is performed on the alloy member 20A. Thereby, the ridge portion 30 is formed.

  The concave portion 35 reduces the area of the energized 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 according to the reduced area of the energized region. .

  Therefore, whether or not the recess 35 is formed in the ridge portion 30 and, if the recess 35 is formed, the size (depth) of the recess 35 is adjusted so that the pair of electrode plates 10, 10, and 10 are formed. The resistance value between the initial resistance value (the resistance value between the pair of electrode plate materials 10 and 10 in a state before the concave portion 35 is formed in the ridge portion 30 of the resistance alloy plate material 20) to a desired resistance value. Can be.

  In the illustrated embodiment, as described above, three ridges 30 (1), 30 (2), and 30 (3) are formed on the resistance alloy plate 20, and the ridge located 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) shallower than Da is formed in the ridge portion 30 (1) on one side in the width direction. Are not formed in the ridge 30 (3) on the other side in the width direction.

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

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

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

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

From the viewpoint of adjusting the area of the current-carrying region in the resistance alloy plate 20 by the concave portion 35, preferably, the alloy member 20A is connected to the ridge portion while being connected between the pair of electrode members 10, 10. The entirety of the alloy member 20A, including the alloy member 30, is formed so as to be disposed in a space 90 (see FIG. 6 described below) sandwiched between the opposed end surfaces 15, 15 of the pair of electrode members 10, 10.
According to such a configuration, the area of the current-carrying region can be adjusted with high sensitivity by the size (depth) of the concave portion 35.

Hereinafter, a method for manufacturing the shunt resistor 1 according to the present embodiment will be described.
As shown in FIG. 6, in the manufacturing method, a pair of conductive members 10A and 10A forming the pair of electrode plates 10 and 10 and an alloy member 20A forming the resistance alloy plate 20 are prepared. There is a step of connecting the pair of conductive members 10A and 10A by 20A to form a resistor pre-assembly.

Here, the ridge portion 30 is previously formed on the surface of the alloy member 20A by wire drawing or rolling.
The alloy member 20A is connected to the pair of conductive members 10A, 10A (the pair of electrode members 10, 10) by the alloy member 20A. The resistance value (initial resistance value) between the pair of electrode plates 10, 10) has a resistance value smaller than a desired resistance value desired in a 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 entirety of the alloy member 20A including the ridge 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, the upper end of the ridge portion 30 is arranged so as to be disposed in the space 90 sandwiched between the end surfaces 15 and 15. The bottom surface 22 of the alloy member 20A is flush with the upper surfaces 11, 11 of the pair of electrode members 10, 10 or lower than the upper surfaces 11, 11, and the bottom surface 12, 12 of the pair of electrode members 10, 10 is flush with the bottom surfaces 12, 12. One or more side surfaces 23 of the alloy member 20 </ b> A are located above the bottom surfaces 12, 12 and the corresponding side surfaces 13, 13 of the pair of electrode members 10, 10 or the side surfaces 1. Can to be located inward than 13, forming the alloy member.

  Next, in the manufacturing method, a step of measuring a resistance value between the pair of conductive members 10A and 10A (the pair of electrode plate materials 10 and 10) in the resistor pre-assembly as an initial resistance value; 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 the resistance value from the initial resistance value by the resistance value to be adjusted by forming a concave portion 35 in the ridge portion 30 of the alloy member 20A (the resistance alloy plate material 20). Have been.

  Specifically, the manufacturing method determines the size and the number of the recesses 35 to be formed in the ridge portion 30 so that the resistance value of the resistance alloy plate 20 increases by the resistance value to be adjusted. It has a determining step and a concave part forming step of forming the concave parts 35 of the size and the number determined in the concave part determining step in the ridge part 30.

  Here, the rise resistance information relating to how much the resistance value of the alloy member 20A (the resistance alloy plate 20) increases depending on the size (depth) of the recess 35 formed by the recess forming member 50 is determined in advance by an experiment. And the like.

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

  For example, the rise resistance value information includes the size (depth) of the recess 35 formed in the first ridge (for example, the ridge 30 (2)) of the plurality of ridges 30 and the rise resistance. The relationship and the size of the recesses 35 sequentially formed in the remaining ridges in a state where the recesses 35 having an upper limit size (depth) are formed in the first ridge (for example, the ridge 30 (2)). It may include the relationship between (depth) and the rising resistance value.

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

Instead, the rise resistance value information indicates the size (depth) of the recess 35 and the rise resistance when the recess 35 having the same size (depth) is formed in each of the plurality of ridges 30. It can include a relationship to a value.
In this case, in the recess determining step, the size (depth) of the recess 35 formed in each of the plurality of ridges 30 is determined.

  In the recess forming step, the recesses 35 having the number and the size (depth) determined in the recess determining step are formed in the ridge portion 30.

In the present embodiment, in the recess forming step, the recess 35 is formed by the recess forming member 50 (see FIG. 7) which is pushed in a direction orthogonal to the ridge 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 according to the present embodiment, a desired resistance value can be obtained without causing generation of unnecessary objects such as shavings and punched pieces during a manufacturing process and without causing local strength deterioration in a final form. The shunt resistor 1 can be easily manufactured.

That is, a shunt resistor having a desired resistance value is formed by forming a slit that opens 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 slit. In the conventional configuration for manufacturing the shunt resistor, the strength of the slit forming portion, particularly the bending strength in the direction perpendicular to the plate surface, is weakened, and the vibration or bending stress that can be added in the use state of the shunt resistor causes breakage or damage. May be caused.
In addition, since the slit is open outward in a plan view, the edge of the slit is liable to come into contact with an external peripheral member, thereby causing a problem that the slit is easily damaged or damaged.
Further, there is a problem that shavings are generated when the slit is formed by laser trimming, and it is necessary to remove the shavings in a subsequent 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 punching and forming a shunt resistor across 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 is opened outward in a plan view, so the strength of the notch forming portion, particularly in a direction orthogonal to the plate surface. The bending strength of the shunt resistor is weakened, and vibration or bending stress that may be applied in the use state of the shunt resistor may cause breakage or damage.
In addition, there is a problem that the edge portion of the notch is likely to come into contact with an external peripheral member, which also causes breakage or damage.
Furthermore, when forming the resistance value adjusting hole by the punch, a punched piece is generated, and there is a problem that the punched piece needs to be removed in a later process.

  The manufacturing method according to the present embodiment can easily manufacture a shunt resistor having a desired resistance value while preventing such disadvantages in the related art.

In the shunt resistor 1 manufactured by the manufacturing method according to the present embodiment, the size (depth) and / or quantity of the concave portion 35 formed in the ridge portion 30 in the resistance alloy plate 20 is determined. By confirming, the adjusted resistance value can be reliably recognized.
Therefore, when the initial resistance value is known, the resistance value of the shunt resistor 1 can be reliably recognized by checking the size (depth) and / or quantity of the concave portion 35.

REFERENCE SIGNS LIST 1 shunt resistor 10 electrode plate 15 facing end surface 20 resistance alloy plate 20A alloy member 30 ridge 35 recess 90 space

Claims (5)

A shunt resistor, comprising: a pair of electrode plates separated from each other in a plate surface direction; and a resistance alloy plate connecting the pair of electrode plates, wherein a resistance value between the pair of electrode plates is adjusted to a desired resistance value. A method of manufacturing a vessel,
An alloy member forming the resistance alloy plate material, having a ridge portion that forms a convex portion in a cross section along a direction perpendicular to the plate surface and extends in a conduction direction from one of the pair of electrode plate materials to the other. A step of preparing an alloy member having a resistance such that the resistance between the pair of electrode plates is smaller than the desired resistance in a state where the pair of electrode plates are connected,
A resistor pre assembly formed by connecting the pair of electrodes plate by said alloy member, the whole of the alloy member including the ridge portion is positioned in a space sandwiched between the opposed end faces of said pair of electrodes plate Forming a resistor pre-assembly ,
Measuring the resistance between the pair of electrode plates in the resistor pre-assembly as an initial resistance,
Calculating a difference between the desired resistance value and the initial resistance value as a resistance value to be adjusted;
A concave portion determining step of determining the size and the number of concave portions to be formed in the ridge portion so that the resistance value of the resistance alloy plate material increases by the resistance value to be adjusted,
Forming a recess having the size and the number of recesses determined in the recess determining step in the ridge. The method according to claim 1, wherein the alloy member has a plurality of the ridges parallel to each other. The step of determining the concave portion includes a relationship between the size of the concave portion formed in one of the plurality of ridge portions and the rising resistance value, and a state in which a concave portion having an upper limit size is formed in the one ridge portion. 3. The method according to claim 2 , wherein the number and the size of the concave portions to be formed are determined based on rising resistance value information including a relationship between the size of the concave portions sequentially formed in the remaining ridge portions and the rising resistance value. A method for manufacturing the shunt resistor according to the above. The concave portion determining step, when forming a concave portion of the same size in each of the plurality of ridges, based on rising resistance value information including a relationship between the size of the concave portion and the rising resistance value, the plurality of ridges 3. The method for manufacturing a shunt resistor according to claim 2 , wherein the size of the concave portion to be formed in each of the above is determined. A shunt resistor comprising a pair of electrode plates separated from each other in a plate surface direction and a resistance alloy plate connecting the pair of electrode plates, wherein a resistance value between the pair of electrode plates is adjusted to a desired resistance value. A method of manufacturing a vessel,
An alloy member forming the resistance alloy plate material, forming a convex portion in a cross section along a direction perpendicular to the plate surface, and with respect to each other in a state along an energizing direction from one of the pair of electrode plate materials to the other. An alloy member having a resistance value such that the resistance value between the pair of electrode plate members is smaller than the desired resistance value in a state where the pair of electrode plate members are connected to each other. The process of preparing,
Forming a resistor pre-assembly by connecting the pair of electrode plates by the alloy member;
A step of measuring a resistance value between the pair of electrode plate members in the resistor pre-assembly as an initial resistance value,
Calculating a difference between the desired resistance value and the initial resistance value as a resistance value to be adjusted;
A concave portion determining step of determining the size and the number of concave portions to be formed in the ridge portion so that the resistance value of the resistance alloy plate material is increased by the resistance value to be adjusted,
A recess forming step of forming a recess of the size and the number determined by the recess determining step in the ridge portion,
The step of determining the concave portion includes a relationship between the size of the concave portion formed in one of the plurality of ridge portions and the rising resistance value, and a state in which a concave portion having an upper limit size is formed in the one ridge portion. in the remainder of the basis of the rising resistance value information including the relationship between the size and increase the resistance values of the recessed portion to be sequentially formed ridge, recess quantity and size characteristics and to Resid Yanto resistance to determine to be made form Method of manufacturing the vessel.

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