JP6876731B2 - Shunt resistor - Google Patents

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JP6876731B2
JP6876731B2 JP2019008898A JP2019008898A JP6876731B2 JP 6876731 B2 JP6876731 B2 JP 6876731B2 JP 2019008898 A JP2019008898 A JP 2019008898A JP 2019008898 A JP2019008898 A JP 2019008898A JP 6876731 B2 JP6876731 B2 JP 6876731B2
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resistance value
alloy plate
resistance
character string
shunt resistor
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建二 村上
建二 村上
浩也 小早川
浩也 小早川
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Suncall Corp
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Description

本発明は、電流値検出用に用いられるシャント抵抗器に関する。 The present invention relates to a shunt resistor used for current value detection.

シャント抵抗器は、電流値の検出対象となる電気回路に直列接続され、当該シャント抵抗器を挟んだ両側の電圧値を測定することによって、前記回路の電流値を検出する際に利用される部材であり、回転電動機におけるバスリング(バスバー)等の種々の分野において広く利用されている。 The shunt resistor is connected in series to an electric circuit whose current value is to be detected, and is a member used when detecting the current value of the circuit by measuring the voltage values on both sides of the shunt resistor. It is widely used in various fields such as bus rings (bus bars) in rotary electric motors.

例えば、下記特許文献1には、所定厚み及び幅を有するCu等の金属板材から一対の電極部と前記一対の電極部を連結する連結部とを一体的に有する中間体を形成し、前記一対の電極部に跨がるようにCu−Mn系合金、Ni−Cr系合金又はCu−Ni合金等の抵抗合金板材を前記一対の電極部に接合し、その後に、前記連結部を切断除去するシャント抵抗器の製造方法が提案されている。 For example, in Patent Document 1 below, an intermediate body integrally having a pair of electrode portions and a connecting portion connecting the pair of electrode portions is formed from a metal plate material such as Cu having a predetermined thickness and width, and the pair is formed. A resistance alloy plate material such as a Cu—Mn alloy, a Ni—Cr alloy, or a Cu—Ni alloy is joined to the pair of electrode portions so as to straddle the electrode portions of the above, and then the connecting portion is cut and removed. A method for manufacturing a shunt resistor has been proposed.

また、下記特許文献2には、絶縁基板上で対向配置された一対の電極導体を接続するように厚膜抵抗体を前記一対の電極導体に接合させると共に、前記厚膜抵抗体をレーザトリミングすることで所定の抵抗値を得る方法が提案されている。 Further, in Patent Document 2 below, 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 laser trimmed. Therefore, a method of obtaining a predetermined resistance value has been proposed.

前記特許文献1に記載の製造方法は、抵抗合金板材の一対の電極部に対する取付姿勢の安定化を図り得る点において有用である。
また、前記特許文献2に記載の方法は、抵抗値を高精度に調整できる点において有用である。
The manufacturing method described in Patent Document 1 is useful in that it is possible to stabilize the mounting posture of the resistance alloy plate material with respect to the pair of electrode portions.
Further, the method described in Patent Document 2 is useful in that the resistance value can be adjusted with high accuracy.

ところで、一般的に、種々の抵抗値のシャント抵抗器が製造され、電流値の検出対象となる電気回路の仕様に応じて、適切な抵抗値のシャント抵抗器が利用される。 By the way, in general, shunt resistors having various resistance values are manufactured, and shunt resistors having appropriate resistance values are used according to the specifications of the electric circuit for which the current value is detected.

この際、シャント抵抗器は、抵抗値毎に管理されているが、一のシャント抵抗器の抵抗値を直ちに確認することができれば、一のシャント抵抗器を電気回路に取り付ける際の作業に際しシャント抵抗器の選択ミスを可及的に防止することができる。 At this time, the shunt resistor is managed for each resistance value, but if the resistance value of one shunt resistor can be confirmed immediately, the shunt resistance is used when attaching the one shunt resistor to the electric circuit. It is possible to prevent mistakes in the selection of the vessel as much as possible.

しかしながら、前記特許文献1及び2を含み、斯かる観点に着目した先行技術は見当たらない。 However, there is no prior art that includes the above-mentioned Patent Documents 1 and 2 and pays attention to such a viewpoint.

特許第5374732号公報Japanese Patent No. 5374732 特開平10−032110号公報Japanese Unexamined Patent Publication No. 10-032110

本発明は、斯かる従来技術に鑑みなされたものであり、設定抵抗値を使用者に確実に知らしめることができるシャント抵抗器の提供を目的とする。 The present invention has been made in view of such prior art, and an object of the present invention is to provide a shunt resistor capable of surely informing the user of a set resistance value.

本発明は、前記目的を達成するために、互いに対して板面方向に離間された一対の電極板材と前記一対の電極板材を連結し且つ所定の設定抵抗値を有する抵抗合金板材とを備えたシャント抵抗器であって、前記抵抗合金板材の表面には、レーザー加工によって形成され且つ前記抵抗合金板材の設定抵抗値を示す視認可能な文字列パターンが前記一対の電極板材間の電流流れ方向に直交する当該抵抗合金板材の幅方向全域に亘って設けられ、前記抵抗合金板材の抵抗値初期抵抗値から前記設定抵抗値まで上昇するように前記文字列パターンの表面積及び削り取り深さが設定されているシャント抵抗器を提供する。
In order to achieve the above object, the present invention includes a pair of electrode plate materials separated from each other in the plate surface direction and a resistance alloy plate material connecting the pair of electrode plate materials and having a predetermined set resistance value. In the shunt resistor, on the surface of the resistance alloy plate material, a visible character string pattern formed by laser processing and indicating the set resistance value of the resistance alloy plate material is formed in the current flow direction between the pair of electrode plate materials. The surface area and scraping depth of the character string pattern are set so as to be provided over the entire width direction of the orthogonal resistance alloy plate material and the resistance value of the resistance alloy plate material increases from the initial resistance value to the set resistance value. Provides a shunt resistor that is.

本発明に係るシャント抵抗器によれば、一対の電極板材間を連結する抵抗合金板材の表面に、レーザー加工によって形成され且つ前記抵抗合金板材の設定抵抗値を示す視認可能な文字列パターンが前記一対の電極板材間の電流流れ方向に直交する当該抵抗合金板材の幅方向全域に亘って設けられ、前記抵抗合金板材の抵抗値初期抵抗値から前記設定抵抗値まで上昇するように前記文字列パターンの表面積及び削り取り深さが設定されているので、使用者に抵抗合金板材の設定抵抗値を確実に知らしめることができる。
According to shunt resistor according to the present invention, the surface of the resistive alloy sheet for connecting the pair of electrodes plate members are formed by laser processing and the visible character string pattern indicating the set resistance value of the resistor alloy sheet wherein The character string is provided over the entire width direction of the resistance alloy plate material orthogonal to the current flow direction between the pair of electrode plates so that the resistance value of the resistance alloy plate material rises from the initial resistance value to the set resistance value. Since the surface area and the scraping depth of the pattern are set, the user can be surely notified of the set resistance value of the resistance alloy plate material.

図1は、本発明の一実施の形態に係るシャント抵抗器の平面図である。FIG. 1 is a plan view of a shunt resistor according to an embodiment of the present invention. 図2は、図1におけるII-II線に沿った断面図である。FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

以下、本発明に係るシャント抵抗器の一実施の形態について、添付図面を参照しつつ説明する。
図1に、本実施の形態に係るシャント抵抗器1の平面図を示す。
又、図2に、図1におけるII-II線に沿った前記シャント抵抗器1の断面図を示す。
Hereinafter, an embodiment of the shunt resistor according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a plan view of the shunt resistor 1 according to the present embodiment.
Further, FIG. 2 shows a cross-sectional view of the shunt resistor 1 along the line II-II in FIG.

図1及び図2に示すように、前記シャント抵抗器1は、互いに対して板面方向に離間された一対の電極板材10、10と、前記一対の電極板材10、10を連結する抵抗合金板材20とを備えている。 As shown in FIGS. 1 and 2, the shunt resistor 1 is a resistance alloy plate material connecting a pair of electrode plate materials 10 and 10 separated from each other in the plate surface direction and the pair of electrode plate materials 10 and 10. It has 20 and.

前記電極板材10は導電性部材とされ、例えば、Cuの金属板材が好適に利用される。
図1及び図2に示すように、前記一対の電極板材10、10には、両者の間を連結する前記抵抗合金板材20の近傍に位置するように一対の検出用端子15、15が設けられている。
なお、図1及び図2中の符号18は、前記シャント抵抗器を所定位置に固定する為に用いられる締結用の貫通孔である。
The electrode plate material 10 is a conductive member, and for example, a Cu metal plate material is preferably used.
As shown in FIGS. 1 and 2, the pair of electrode plates 10 and 10 are provided with a pair of detection terminals 15 and 15 so as to be located in the vicinity of the resistance alloy plate 20 connecting the two. ing.
Reference numeral 18 in FIGS. 1 and 2 is a through hole for fastening used for fixing the shunt resistor at a predetermined position.

前記抵抗合金板材20は、所定の設定抵抗値を有するものとされる。
前記抵抗合金板材20は、例えば、Cu−Mn系合金、Ni−Cr系合金、Cu−Ni系合金が好適に利用される。
The resistance alloy plate material 20 is assumed to have a predetermined set resistance value.
As the resistance alloy plate material 20, for example, Cu—Mn-based alloys, Ni—Cr-based alloys, and Cu—Ni-based alloys are preferably used.

本実施の形態においては、図1に示すように、前記抵抗合金板材20の表面には、レーザー加工によって形成された文字列パターン25であって、当該抵抗合金板材20の設定抵抗値を示す視認可能な文字列パターン25が設けられている。 In the present embodiment, as shown in FIG. 1, the surface of the resistance alloy plate 20 is a character string pattern 25 formed by laser processing, and is visually recognized to indicate the set resistance value of the resistance alloy plate 20. A possible character string pattern 25 is provided.

図示の形態においては、前記抵抗合金板材20は抵抗値が0.1mΩとされており、その為、文字列パターン25として「0.1mΩ」がレーザー加工によって形成されている。 In the illustrated form, the resistance alloy plate 20 has a resistance value of 0.1 mΩ, and therefore, “0.1 mΩ” is formed as a character string pattern 25 by laser processing.

詳しくは、前記文字列パターン25の表面積及び削り取り深さを調整することによって、前記抵抗合金板材20の抵抗値が初期抵抗値(レーザー加工前の状態の抵抗値)から設定抵抗値へ調整されている。 Specifically, by adjusting the surface area and the scraping depth of the character string pattern 25, the resistance value of the resistance alloy plate material 20 is adjusted from the initial resistance value (resistance value in the state before laser machining) to the set resistance value. There is.

即ち、所定表面積を有する前記文字列パターン25をレーザー加工によって所定深さだけ削り取ることによって、前記抵抗合金板材20の断面積が減少し、この断面積の減少に応じて前記抵抗合金板材20の抵抗値が初期抵抗値から設定抵抗値まで上昇することになる。 That is, by scraping the character string pattern 25 having a predetermined surface area by a predetermined depth by laser processing, the cross-sectional area of the resistance alloy plate 20 is reduced, and the resistance of the resistance alloy plate 20 is reduced according to the reduction of the cross-sectional area. The value will increase from the initial resistance value to the set resistance value.

斯かる構成の前記シャント抵抗器1によれば、前記文字列パターン25の表面積及び削り取り深さを調整することによって、前記抵抗合金板材20の抵抗値を所望の設定抵抗値に一致させるように構成されているので、製造コストの高騰を招くこと無く前記シャント抵抗器1を所望の設定抵抗値に調整させることができ、さらに、前記抵抗合金板材20の設定抵抗値を使用者に確実に知らしめることができる。 According to the shunt resistor 1 having such a configuration, the resistance value of the resistance alloy plate 20 is configured to match a desired set resistance value by adjusting the surface area and the scraping depth of the character string pattern 25. Therefore, the shunt resistor 1 can be adjusted to a desired set resistance value without causing an increase in manufacturing cost, and the set resistance value of the resistance alloy plate 20 is surely notified to the user. be able to.

従って、前記シャント抵抗器を抵抗値毎に管理する際の管理作業を効率良く行うことができ、さらに、前記シャント抵抗器を電気回路に連結させる際の前記シャント抵抗器の選択ミスを可及的に防止することができる。 Therefore, it is possible to efficiently perform the management work when managing the shunt resistor for each resistance value, and further, it is possible to make a mistake in selecting the shunt resistor when connecting the shunt resistor to the electric circuit. Can be prevented.

次に、前記シャント抵抗器1の製造方法について説明する。
まず、第1の製造方法について説明する。
第1の製造方法は、前記一対の電極板材10、10が前記抵抗合金板材20によって連結されてなる抵抗器素材を用意する工程と、前記抵抗合金板材20の初期抵抗値を測定する工程と、前記設定抵抗値を示す視認可能な文字列パターン25(例えば、0.1mΩ)が形成されるように前記抵抗合金板材20の表面のうち文字列パターン25を形成する領域を削り取るレーザー加工であって、削り取り深さが所定の基準深さとなるようなレーザー出力値でレーザー加工を行う基準出力レーザー加工工程と、前記基準出力レーザー加工を行うことによって前記文字列パターン25が基準深さを有する状態とされた前記抵抗合金板材20の抵抗値(文字列パターン基準深さ状態抵抗値)を測定する工程と、前記初期抵抗値及び前記文字列パターン基準深さ状態抵抗値に基づき、1回の基準出力レーザー加工によって変化する抵抗合金板材の基準変化抵抗値を算出する工程と、文字列パターン基準深さ状態抵抗値及び設定抵抗値の差違と基準変化抵抗値とに基づいて算出される必要回数だけ基準深さレーザー加工を行う工程とを含むものとされる。
Next, a method of manufacturing the shunt resistor 1 will be described.
First, the first manufacturing method will be described.
The first manufacturing method includes a step of preparing a resistor material in which the pair of electrode plate members 10 and 10 are connected by the resistance alloy plate material 20, and a step of measuring the initial resistance value of the resistance alloy plate material 20. Laser processing that scrapes off the region of the surface of the resistance alloy plate 20 that forms the character string pattern 25 so that the visible character string pattern 25 (for example, 0.1 mΩ) indicating the set resistance value is formed. A reference output laser processing step in which laser processing is performed at a laser output value such that the scraping depth becomes a predetermined reference depth, and a state in which the character string pattern 25 has a reference depth by performing the reference output laser processing. One reference output based on the step of measuring the resistance value (character string pattern reference depth state resistance value) of the resistance alloy plate material 20 and the initial resistance value and the character string pattern reference depth state resistance value. The standard change resistance value of the resistance alloy plate material that changes due to laser processing is calculated, and the required number of times is calculated based on the difference between the character string pattern reference depth state resistance value and the set resistance value and the reference change resistance value. It includes a step of performing depth laser processing.

例えば、前記設定抵抗値が0.100mΩである場合において、前記抵抗器素材の初期抵抗値(レーザー加工を行う前の状態の抵抗値)が0.05mΩであり、前記文字列パターン基準深さ状態抵抗値が0.06mΩであったとする。 For example, when the set resistance value is 0.100 mΩ, the initial resistance value (resistance value in the state before laser processing) of the resistor material is 0.05 mΩ, and the character string pattern reference depth state. It is assumed that the resistance value is 0.06 mΩ.

この場合には、前記基準変化抵抗値は0.01mΩ(=0.06mΩ−0.05mΩ)となり、文字列パターン基準深さ状態抵抗値(0.06mΩ)及び設定抵抗値(0.100mΩ)の差違(0.04mΩ)と基準変化抵抗値(0.01mΩ)とに基づいて算出される必要回数である4回だけ前記基準深さレーザー加工を行うことで、前記抵抗合金板材20の抵抗値を設定抵抗値である0.100mΩとすることができる。 In this case, the reference change resistance value is 0.01 mΩ (= 0.06 mΩ-0.05 mΩ), which is the character string pattern reference depth state resistance value (0.06 mΩ) and the set resistance value (0.100 mΩ). The resistance value of the resistance alloy plate 20 is increased by performing the reference depth laser processing only four times, which is the required number of times calculated based on the difference (0.04 mΩ) and the reference change resistance value (0.01 mΩ). The set resistance value can be 0.100 mΩ.

前記第1の製造方法によれば、所望の設定抵抗値を有し且つ当該設定抵抗値を使用者に確実に知らしめることができる前記シャント抵抗器1を確実に且つ効率良く製造することができる。 According to the first manufacturing method, the shunt resistor 1 having a desired set resistance value and capable of surely informing the user of the set resistance value can be manufactured reliably and efficiently. ..

前記第1の製造方法に代えて、下記構成の第2の製造方法によっても前記シャント抵抗器1を製造することができる。 The shunt resistor 1 can be manufactured by a second manufacturing method having the following configuration instead of the first manufacturing method.

前記第2の製造方法は、前記抵抗器素材を用意する工程と前記抵抗合金板材の初期抵抗値を測定する工程とを有し、これらの工程の後に、想定される複数の設定抵抗値毎に用意された変化抵抗値/レーザー出力に関するデータを用いて、レーザー加工する際のレーザー出力値を算出し、前記レーザー出力値のレーザーを用いて前記文字列パターン25を形成するレーザー加工工程を備えるものとされる。 The second manufacturing method includes a step of preparing the resistor material and a step of measuring the initial resistance value of the resistance alloy plate material, and after these steps, for each of a plurality of assumed set resistance values. It is provided with a laser processing step of calculating a laser output value at the time of laser processing using the prepared data on the change resistance value / laser output and forming the character string pattern 25 using the laser of the laser output value. It is said that.

前記変化抵抗値/レーザー出力に関するデータは、設定抵抗値を示す視認可能な所定表面積の文字列パターン25が形成されるように前記抵抗合金板材20の表面のうち前記文字列パターン25を形成する領域を削り取るレーザー加工を行うことによって変化する抵抗合金板材の変化抵抗値の大きさとレーザー出力の大きさとの関係を示すデータであり、予め実験等によって得られている。 The data on the change resistance value / laser output is a region of the surface of the resistance alloy plate material 20 that forms the character string pattern 25 so that a character string pattern 25 having a visible predetermined surface area indicating the set resistance value is formed. This is data showing the relationship between the magnitude of the change resistance value of the resistance alloy plate material and the magnitude of the laser output, which are changed by performing laser processing, and have been obtained in advance by experiments and the like.

前記第2の製造方法における前記レーザー加工工程においては、初期設定値と設定抵抗値との差違に基づき得られる変化させるべき抵抗値と前記変化抵抗値/レーザー出力に関するデータとに応じて後続するレーザー加工時において必要とされるレーザー出力値を算出し、前記レーザー出力値のレーザーで前記文字列パターン25を形成する領域に対してレーザー加工を行う。 In the laser processing step in the second manufacturing method, a laser that follows according to the resistance value to be changed obtained based on the difference between the initial set value and the set resistance value and the data related to the changed resistance value / laser output. The laser output value required at the time of processing is calculated, and laser processing is performed on the region forming the character string pattern 25 with the laser of the laser output value.

前記第2の製造方法においても、所望の設定抵抗値を有し且つ当該設定抵抗値を使用者に確実に知らしめることができる前記シャント抵抗器1を確実に且つ効率良く製造することができる。 Also in the second manufacturing method, the shunt resistor 1 having a desired set resistance value and capable of surely informing the user of the set resistance value can be manufactured reliably and efficiently.

前記第1及び第2の製造方法に代えて、下記構成の第3の製造方法によっても前記シャント抵抗器1を製造することができる。 Instead of the first and second manufacturing methods, the shunt resistor 1 can also be manufactured by a third manufacturing method having the following configuration.

前記第3の製造方法は、前記抵抗器素材を用意する工程と前記抵抗合金板材20の初期抵抗値を測定する工程とを有し、これらの工程の後に、想定される複数の設定抵抗値毎に用意された変化抵抗値/文字列パターン表面積に関するデータを用いて後続する所定基準出力値のレーザーによるレーザー加工を行う際にレーザー加工すべき文字列パターンの表面積を算出し、前記表面積を有するように前記基準出力値のレーザーによって前記文字列パターン25を形成するレーザー加工工程を備えるものとされる。 The third manufacturing method includes a step of preparing the resistor material and a step of measuring the initial resistance value of the resistance alloy plate material 20, and after these steps, each of a plurality of assumed set resistance values. Using the data on the change resistance value / character string pattern surface area prepared in the above, the surface area of the character string pattern to be laser-processed when performing the subsequent laser processing with a predetermined reference output value laser is calculated so as to have the surface area. Is provided with a laser processing step of forming the character string pattern 25 by the laser having the reference output value.

前記変化抵抗値/文字列パターン表面積に関するデータは、設定抵抗値を示す視認可能な文字列パターン25を形成する為に前記抵抗合金板材20の表面のうち前記文字列パターン25を形成する領域を前記基準出力値のレーザーによって削り取る際の前記文字列パターン25の表面積とこのレーザー加工によって変化する抵抗合金板材の変化抵抗値の大きさとの関係を示すデータであり、予め実験等によって得られている。 The data on the change resistance value / character string pattern surface area includes the region of the surface of the resistance alloy plate 20 on which the character string pattern 25 is formed in order to form a visible character string pattern 25 indicating the set resistance value. This data shows the relationship between the surface area of the character string pattern 25 when scraped by a laser having a reference output value and the magnitude of the change resistance value of the resistance alloy plate material that changes due to this laser processing, and has been obtained in advance by experiments or the like.

前記第3の製造方法における前記レーザー加工工程においては、初期設定値と設定抵抗値との差違に基づき得られる変化させるべき抵抗値と前記変化抵抗値/文字列パターン表面積に関するデータとに応じて、レーザー加工を行うべき文字列パターンの表面積を算出し、前記表面積を有するように前記基準出力値のレーザーによって前記文字列パターン25が形成される。 In the laser processing step in the third manufacturing method, the resistance value to be changed obtained based on the difference between the initial set value and the set resistance value and the data on the changed resistance value / character string pattern surface area are obtained. The surface area of the character string pattern to be laser-processed is calculated, and the character string pattern 25 is formed by the laser having the reference output value so as to have the surface area.

前記第3の製造方法においても、所望の設定抵抗値を有し且つ当該設定抵抗値を使用者に確実に知らしめることができる前記シャント抵抗器1を確実に且つ効率良く製造することができる。 Also in the third manufacturing method, the shunt resistor 1 having a desired set resistance value and capable of surely informing the user of the set resistance value can be manufactured reliably and efficiently.

1 シャント抵抗器
10 電極板材
20 抵抗合金板材
25 文字列パターン
1 Shunt resistor 10 Electrode plate material 20 Resistance alloy plate material 25 Character string pattern

Claims (1)

互いに対して板面方向に離間された一対の電極板材と前記一対の電極板材を連結し且つ所定の設定抵抗値を有する抵抗合金板材とを備えたシャント抵抗器であって、
前記抵抗合金板材の表面には、レーザー加工によって形成され且つ前記抵抗合金板材の設定抵抗値を示す視認可能な文字列パターンが前記一対の電極板材間の電流流れ方向に直交する当該抵抗合金板材の幅方向全域に亘って設けられ、
前記抵抗合金板材の抵抗値初期抵抗値から前記設定抵抗値まで上昇するように前記文字列パターンの表面積及び削り取り深さが設定されていることを特徴とするシャント抵抗器。
A shunt resistor comprising a pair of electrode plates separated from each other in the plate surface direction and a resistance alloy plate that connects the pair of electrode plates and has a predetermined set resistance value.
On the surface of the resistance alloy plate material, a visible character string pattern formed by laser processing and indicating the set resistance value of the resistance alloy plate material is orthogonal to the current flow direction between the pair of electrode plate materials. It is provided over the entire width direction and is provided.
A shunt resistor characterized in that the surface area and scraping depth of the character string pattern are set so that the resistance value of the resistance alloy plate material rises from the initial resistance value to the set resistance value.
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