JP6995661B2 - Clamp sensor and measuring device - Google Patents

Description

The present invention relates to a clamp sensor provided with a pair of clamp portions to detect a measured amount, and a measuring device provided with the clamp sensor to measure a measured amount.

As this type of clamp sensor, the clamp sensor disclosed by the applicant in Patent Document 1 below is known. The clamp sensor comprises a pair of sensors each having a magnetic core and a cover covering the magnetic core. Further, on the tip surface of one of the sensors, a detection element for detecting a magnetic field generated around the measurement target is arranged in a state of being mounted on a flexible substrate.

Japanese Unexamined Patent Publication No. 2016-70771 (Page 5, Fig. 1)

However, the above-mentioned clamp sensor has the following problems to be improved. Specifically, in this clamp sensor, a detection element mounted on a flexible substrate is arranged on the tip surface of one of the sensors. In this case, in this clamp sensor, the location where the detection element is arranged on the flexible substrate is located on the front end surface of the magnetic core, and double-sided tape or the like is applied to the front end surface and inner peripheral surface of the magnetic core and the back surface of the flexible substrate. A configuration is adopted in which it is bonded and fixed by using. In this case, in order to detect the magnetic field with high accuracy, it is necessary to accurately align the tip surface of the magnetic core and the detection element in a predetermined state. However, in addition to the difficulty of bonding the tip surface of the magnetic core and the detection element while aligning them, this type of magnetic core generally has variations in dimensions, so that it is different from the tip surface of the magnetic core. It is difficult to accurately align the detection element with the detection element. Therefore, the conventional clamp sensor has a problem that the detection accuracy of the magnetic field may be lowered due to the positional deviation between the tip surface of the magnetic core and the detection element.

In addition, the influence of the change in the magnetic flux density of the magnetic core due to the change in the distance between the measurement target and each sensor when the measurement target is clamped by two sensors is reduced, and the magnetic field generated around the measurement target is accurately measured. For this purpose, it is preferable to arrange the detection element at an intermediate position of each tip surface in each magnetic core of each sensor. However, in the conventional clamp sensor, the flexible substrate on which the detection element is mounted is adhered and fixed to the tip surface of one of the magnetic cores. That is, the detection element is arranged at a position biased toward the tip end surface side of one of the magnetic cores. Therefore, in this clamp sensor, the detection accuracy of the magnetic field may decrease due to the influence of the change in the magnetic flux density of the magnetic core due to the change in the distance between the detection element and each sensor. There are also challenges.

The present invention has been made in view of the problem to be improved, and an object of the present invention is to provide a clamp sensor and a measuring device capable of improving the detection accuracy of the detected amount.

In order to achieve the above object, the clamp sensor according to claim 1 has a case portion and a magnetic core housed in the accommodating portion in the case portion, and at least one of them rotates so that the respective tip portions open and close. A pair of clamps that can be configured to clamp the measurement target in a state where the tips are in contact with each other, and an inner peripheral surface and an outer circumference of the magnetic core housed in one of the clamps. The clamp portion is housed in the case portion of at least one of the surfaces and the clamp portion of one of the clamp portions in a state of being arranged so as to extend along the distal end surface of the magnetic core, and the facing portion facing the distal end surface is described. A clamp sensor provided with a strip-shaped flexible substrate on which a detection element for detecting an amount to be detected for a measurement target is mounted. The case portion of one of the clamp portions is formed on the tip end side of the accommodating portion of the case portion, and the cover is attached to the case portion. It is provided with a holding portion configured to be able to accommodate the facing portion of the flexible substrate and to hold the facing portion in a state where the detection element is separated from the tip surface of the magnetic core toward the tip portion side. There is.

Further, the clamp sensor according to claim 2 is the clamp sensor according to claim 1, wherein the cover is configured to have an insulating property.

Further, the clamp sensor according to claim 3 is the clamp sensor according to claim 1, wherein the cover is formed in a flat bag shape having an opening portion on one end side, and the flexibility from the opening portion. One end of the substrate is configured to be insertable along the length direction of the flexible substrate.

Further, the clamp sensor according to claim 4 is the clamp sensor according to any one of claims 1 to 3, wherein the holding portion has the magnetic feature in a state where the tip portions of the clamp portions are in contact with each other. The facing portion of the flexible substrate can be held so that the central portion of the detection element is located at the central portion between the front end surfaces of the core.

The clamp sensor according to claim 5 is the clamp sensor according to any one of claims 1 to 4, wherein the holding portion is the center of the tip surface of the magnetic core in one of the clamp portions and the said. The flexible substrate is configured to be able to hold the facing portion so as to face the center of the facing surface facing the tip surface of the detection element.

Further, the measuring device according to claim 6 measures the measured amount for the measurement target based on the clamp sensor according to any one of claims 1 to 5 and the detected amount detected by the clamp sensor. It is equipped with a measuring unit.

According to the clamp sensor according to claim 1 and the measuring device according to claim 6, a flexible cover for covering the facing portion of the flexible substrate and the tip of the clamp portion rather than the accommodating portion of the case portion of the clamp portion. A holding portion that accommodates the facing portion of the flexible substrate formed on the portion side and has the cover attached, and can hold the facing portion while the detection element is separated from the tip surface of the magnetic core toward the tip side. By providing the above, the facing portion can be reliably held with the detection element positioned at the specified position by a simple operation of accommodating the facing portion with the cover attached in the holding portion of the case portion. .. Therefore, according to this clamp sensor and the measuring device, the tip surface of the magnetic core in the state of being accommodated and held in the accommodating portion can be accurately aligned with the detection element. Therefore, according to this clamp sensor and the measuring device, it is possible to prevent a decrease in the detection accuracy of the magnetic field due to the positional deviation between the tip surface of the case portion and the detection element, and to sufficiently improve the detection accuracy of the magnetic field. ..

Further, according to the clamp sensor according to claim 2 and the measuring device according to claim 6, the cover has an insulating property, so that, for example, when the measurement target is clamped, the tip portion of the clamp portion is measured. Even if the tip of the case is damaged due to contact with the object and the insulating function of the case deteriorates, the detection element can be reliably insulated to detect the magnetic field.

Further, according to the clamp sensor according to claim 3 and the measuring device according to claim 6, one end portion of the flexible substrate is opened by forming a flat bag-shaped cover having an opening portion on one end side. Although it is an easy operation to insert the flexible substrate from the portion along the length direction, the cover can be reliably attached to the facing portion, so that the assembly efficiency can be sufficiently improved.

Further, in the clamp sensor according to claim 4 and the measuring device according to claim 6, the detection element is located at the center between the tip surfaces of each magnetic core in a state where the tips of each clamp are in contact with each other. The holding portion is configured so that the facing portion of the flexible substrate can be held so that the central portion is located. Therefore, according to this clamp sensor and the measuring device, the measurement target is each clamp portion as compared with the conventional configuration in which the facing portion of the flexible substrate is adhered and fixed to the tip surface of one of the magnetic cores. It is possible to sufficiently suppress the influence of the change in the magnetic flux density of each magnetic core due to the change in the distance between the measurement target and each clamp portion when clamped with. Therefore, according to this clamp sensor and the measuring device, it is possible to prevent the detection accuracy from being lowered due to the influence of the change in the magnetic flux density of each magnetic core, and to sufficiently improve the detection accuracy of the magnetic field generated in the measurement target.

Further, according to the clamp sensor according to claim 5 and the measuring device according to claim 6, the center of the tip surface of the magnetic core and the center of the facing surface of the detection element detection element facing the tip surface face each other. By configuring the holding portion so that the facing portion of the flexible substrate can be held, the detection accuracy of the magnetic field is further improved as compared with the configuration in which the center of the tip surface and the center of the facing surface of the detection element do not face each other. Can be improved.

It is a perspective view of the clamp meter 1. It is a perspective view of the clamp meter 1 when the clamp portions 11a and 11b are in an open state. It is a block diagram which shows the structure of the clamp meter 1. It is a front view of the clamp sensor 2. It is an exploded perspective view of a clamp sensor 2. It is explanatory drawing explaining the internal structure of a clamp sensor 2. It is 1st explanatory drawing explaining the assembly method of a clamp sensor 2. It is a perspective view which shows the structure of the tip portion 23a and the cap 24 of a flexible substrate 23. It is a 2nd explanatory drawing explaining the assembly method of a clamp sensor 2. It is a 3rd explanatory diagram explaining the assembly method of a clamp sensor 2. It is a 4th explanatory drawing explaining the assembly method of a clamp sensor 2. It is a 5th explanatory drawing explaining the assembly method of a clamp sensor 2. It is a sixth explanatory drawing explaining the assembly method of the clamp sensor 2. It is a 7th explanatory drawing explaining the assembly method of a clamp sensor 2. It is the 8th explanatory drawing explaining the assembly method of the clamp sensor 2. It is 9th explanatory drawing explaining the assembly method of a clamp sensor 2.

Hereinafter, embodiments of the clamp sensor and the measuring device will be described with reference to the accompanying drawings.

First, the configuration of the clamp meter 1 will be described. The clamp meter 1 shown in FIGS. 1 to 3 is an example of a measuring device, and for example, the current value of the current flowing through the electric wire 100 as the measurement target shown in FIG. 4 (an example of the measured quantity) is non-contact (non-metal). It is configured to be measurable by contact). Specifically, as shown in FIGS. 1 to 3, the clamp meter 1 includes a clamp sensor 2 and a main body portion 3.

As shown in FIGS. 1, 2, and 4, the clamp sensor 2 includes a pair of clamp portions 11a and 11b (hereinafter, also referred to as "clamp portions 11" when not distinguished), and as shown in FIG. 4, each clamp portion. The electric wire 100 is configured to be able to be clamped (surrounded) by each clamp portion 11 in a state where the tip portions 111a and 111b of 11 (hereinafter, also referred to as "tip portion 111" when not distinguished) are in contact with each other. A magnetic field as a detection amount generated around the electric wire 100 when a current is flowing through the wire 100 is detected in a non-contact manner. In this example, the clamp portion 11a corresponds to "one of the clamp portions".

As shown in FIGS. 1 and 2, the clamp portion 11a is fixed to the main body case 64 of the main body portion 3 in a non-rotating state.

Further, as shown in FIG. 5, the clamp portion 11a includes a case portion 21a, a magnetic core 22a, a flexible substrate 23, and a cap 24.

As shown in FIG. 4, the case portion 21a is formed so that the tip portion 41a side has a plan-view arc shape. Further, as shown in FIG. 5, the case portion 21a includes half bodies 31a and 32a manufactured by resin molding (injection molding).

Further, the half bodies 31a and 32a are configured so as to be able to be fitted to each other, and in the fitted state, the intermediate portion 23c of the magnetic core 22a and the flexible substrate 23 (the tip portion 23a corresponding to the facing portion and the base end portion 23b) are formed. Intervening part: (see FIG. 5) is formed to accommodate the accommodating portion 43a (see FIG. 6). Further, the half bodies 31a and 32a form a holding portion 44a (see FIG. 6) located closer to the tip portion 41a than the accommodating portion 43a in the fitted state.

As shown in FIG. 10, the holding portion 44a is configured to accommodate the tip portion 23a of the flexible substrate 23 with the cap 24 attached, and the magnetic detection element 20 mounted on the tip portion 23a (FIG. 10). 8) is configured to be able to hold the tip portion 23a of the flexible substrate 23 in a state where the tip surface 51a of the magnetic core 22a is separated from the tip portion 41a side of the case portion 21a (the tip portion 111a side of the clamp portion 11a). There is.

Further, as shown in FIG. 6, the holding portion 44a has the tip surface 51a of the magnetic core 22a and the magnetic core 22b described later in the clamp portion 11b in a state where the tip portions 111a and 111b of the clamp portions 11a and 11b are in contact with each other. (Hereinafter, when the magnetic cores 22a and 22b are not distinguished, it is also referred to as "magnetic core 22") and the central portion between the tip surface 51b (hereinafter, also referred to as "tip surface 51" when the tip surfaces 51a and 51b are not distinguished). It is configured to hold the tip portion 23a in a state where the central portion of the magnetic detection element 20 is located. In this case, the central portion between the tip surface 51a and the tip surface 51b has a center position separated from each tip surface 51 by an equal distance and a position slightly biased toward either one of the tip surfaces 51 from the center position. Both shall be included. Further, as shown in FIG. 9, the inner surface of the holding portion 44a (the surface on the back side of the paper surface in the figure) protrudes from the inner surface (projects toward the front side of the paper surface in the figure) and the tip portion of the flexible substrate 23. A support projection 45a is formed to support the widthwise end of the 23a. In this case, the height (projection amount) of the support projection 45a is such that the central portion of the tip surface 51a of the magnetic core 22a and the central portion of the facing surface facing the tip surface 51a of the magnetic detection element 20 face each other. It is stipulated.

As shown in FIG. 5, the magnetic core 22a is formed in a plan view arc shape by a magnetic material, and is housed in the housing portion 43a of the case portion 21a as shown in FIG. The magnetic core 22a, together with the magnetic core 22b of the clamp portion 11b, induces a magnetic flux when a current flows through the electric wire 100 in the clamped state and a magnetic field is generated around the electric wire 100.

The flexible substrate 23 corresponds to a flexible substrate and is formed in a band shape as shown in FIG. Further, as shown in FIG. 8, a magnetic detection element 20 is mounted on the tip portion 23a of the flexible substrate 23. In this case, as an example, the magnetic detection element 20 is composed of a Hall element, and is a detected amount generated in the electric wire 100 when a current is flowing through the electric wire 100 in a state where the electric wire 100 is clamped by the clamp portions 11a and 11b. Detects the magnetic field of and outputs the detection signal.

Further, as shown in FIG. 10, in the flexible substrate 23, the tip portion 23a with the cap 24 attached is housed in the holding portion 44a of the case portion 21a and held by the holding portion 44a, except for the tip portion 23a. Is accommodated in the accommodating portion 43a of the case portion 21a so as to extend along the tip surface 51a and the inner peripheral surface 53a (at least one of the inner peripheral surface and the outer peripheral surface) of the magnetic core 22a. .. The tip portion 23a of the flexible substrate 23 corresponds to a facing portion facing the tip surface 51a of the magnetic core 22a in a state of being housed in the holding portion 44a.

The cap 24 is an example of a cover and is made of a material having insulating properties and flexibility (for example, silicone rubber). Further, as shown in FIG. 8, the cap 24 has a rectangular flat bag shape having an opening portion 24a on one side (an example of one end side, in this example, one side of the short side). It is formed so that the tip portion 23a (one end portion) of the flexible substrate 23 can be attached to the tip portion 23a so as to cover the tip portion 23a by inserting the tip portion 23a (one end portion) of the flexible substrate 23 from the open portion 24a along the length direction of the flexible substrate 23. Has been done. In this case, when the cap 24 is attached to the holding portion 44a of the case portion 21a while being attached to the tip portion 23a, the cap 24 is deformed into the shape of the holding portion 44a due to its flexibility and the inner surface of the holding portion 44a. Contact with, thereby restricting the movement of the tip 23a.

In the clamp portion 11b (an example of at least one of the clamp portions 11), the tip portions 111 of each clamp portion 11 are opened and closed (pushed in and released) in response to an operation (pushing in and released) with respect to the lever 44b (see FIG. 4). It is configured to be rotatable around the support shaft 25 (see the figure) so as to be in contact with each other. In the following description, the state in which the tip portions 111 of each clamp portion 11 are closed (the state shown in FIG. 1) is also referred to as a “closed state”, and the state in which the tip portions 111 are open (shown in FIG. 2). The state) is also called "open state". Further, the clamp portion 11b is urged in a direction in which each clamp portion 11 is closed by the elastic force of the spring 13 (see FIG. 5).

Further, as shown in FIG. 5, the clamp portion 11b includes a case portion 21b and a magnetic core 22b.

As shown in FIG. 4, the case portion 21b is formed so that the tip portion 41b side has a plan-view arc shape. Further, as shown in FIG. 5, the case portion 21b includes half bodies 31b and 32b manufactured by resin molding (injection molding).

Further, the half bodies 31b and 32b are configured to be fitable to each other, and form a housing portion 43b (see FIG. 6) capable of accommodating the magnetic core 22b in the fitted state.

As shown in FIG. 5, the magnetic core 22b is formed in a plan view arc shape by a magnetic material, and is housed in a housing portion 43b of a case portion 21b as shown in FIG. The magnetic core 22b, together with the magnetic core 22a of the clamp portion 11a, induces a magnetic flux when a current flows through the electric wire 100 in the clamped state and a magnetic field is generated around the electric wire 100.

As shown in FIG. 3, the main body 3 includes a display unit 61, an operation unit 62, a processing unit 63, and a main body case 64 (see FIGS. 1 and 2).

The display unit 61 is composed of, for example, a liquid crystal panel, and is arranged on the front panel of the half body 64a constituting the main body case 64, as shown in FIGS. 1 and 2. Further, the display unit 61 displays the current direct current measured by the processing unit 63, etc., according to the control of the processing unit 63.

As shown in FIGS. 1 and 2, the operation unit 62 is configured to include various switches 62a, dials 62b, and the like arranged on the front panel of the half body 64a constituting the main body case 64, and responds to these operations. Outputs the operation signal.

The processing unit 63 controls each unit constituting the main body unit 3 according to the operation signal output from the operation unit 62. Further, the processing unit 63 functions as a measuring unit, measures the current value (measured quantity) of the current flowing through the electric wire 100 based on the detection signal output from the clamp sensor 2 (magnetic detection element 20), and displays the display unit. It is displayed on 61.

As shown in FIGS. 1 and 2, the main body case 64 includes half bodies 64a and 64b manufactured by resin molding (injection molding) and formed so as to be fitted to each other, and accommodates or accommodates each part constituting the main body portion 3. It is configured so that it can be arranged and the clamp sensor 2 can be attached.

Next, the method of assembling the clamp meter 1 will be described with reference to the drawings.

First, the clamp sensor 2 is assembled. Specifically, as shown in FIG. 7, the magnetic core 22a is formed at the forming portion of the accommodating portion 43a (the portion forming the accommodating portion 43a together with the half body 32a) in the half body 31a constituting the case portion 21a of the clamp portion 11a. Insert the half (the half on the back side of the paper in the figure).

Next, the cap 24 is attached to the tip portion 23a of the flexible substrate 23. In this case, as shown in FIG. 8, the cap 24 is formed in a flat bag shape having an open portion 24a on one side. Therefore, as shown in the figure, the cap 24 is simply inserted into the cap 24 from the open portion 24a of the cap 24 along the length direction of the flexible substrate 23 by inserting the tip portion 23a of the flexible substrate 23 into the cap 24. Can be easily attached.

Subsequently, as shown in FIG. 9, the flexible substrate 23 is bent along the inner peripheral surface of the case portion 21a. Next, as shown in FIGS. 9 and 10, the tip portion 23a of the flexible substrate 23 in a state where the cap 24 is attached to the forming portion of the holding portion 44a in the half body 31a (the portion forming the holding portion 44a together with the half body 32a). Half of the middle portion 23c (half of the back side of the paper surface in the figure) between the tip portion 23a and the base end portion 23b of the flexible substrate 23 is fitted with the magnetic core. It is fitted between the inner peripheral surface 53a of the magnetic core 22a and the inner peripheral surface of the accommodating portion 43a so as to be along the inner peripheral surface 53a of the 22a. In this case, since the cap 24 has flexibility, it can be easily fitted by deforming the cap 24.

Subsequently, as shown in FIG. 11, the flexible substrate 23 in which the cap 24 is attached to the forming portion of the holding portion 44a (the portion forming the holding portion 44a together with the half body 31a) in the half body 32a constituting the case portion 21a. Half of the tip portion 23a (half of the front side of the paper surface in the figure) is fitted, and half of the intermediate portion 23c of the flexible substrate 23 and half of the magnetic core 22a (half of the front side of the paper surface in the figure) are fitted into the accommodating portion 43a. The half body 31a and the half body 32a are fitted while being fitted. As a result, as shown in FIG. 12, the clamp portion 11a is assembled.

Here, in the conventional configuration in which the tip portion 23a of the flexible substrate 23 is adhered and fixed to the tip surface 51a of the magnetic core 22a, the magnetism mounted on the tip surface 51a of the magnetic core 22a and the tip portion 23a of the flexible substrate 23. In addition to the difficulty of adhering the detection element 20 while aligning it, the dimensions of the magnetic core 22a vary, so that the tip surface 51a of the magnetic core 22a and the magnetic detection element 20 are accurately aligned. It is difficult to do. On the other hand, in this clamp sensor 2, a configuration is adopted in which the tip portion 23a with the cap 24 attached is held by the holding portion 44a formed in the case portion 21a. In this case, since the case portion 21a is manufactured by resin molding (injection molding), the holding portion 44a is formed with accurate dimensions. Further, since the cap 24 has flexibility, the cap 24 is deformed into the shape of the holding portion 44a and comes into contact with the inner surface of the holding portion 44a, thereby restricting the movement of the tip portion 23a. Therefore, in this clamp sensor 2, the magnetic detection element 20 is positioned at a specified position by a simple operation of accommodating (fitting) the tip portion 23a with the cap 24 attached in the holding portion 44a of the case portion 21a. It can be reliably held in the state of being clamped. Further, even if the dimensions of the magnetic core 22a vary slightly, the tip surface 51a of the magnetic core 22a is set to the specified position (almost the specified position) in the state where the magnetic core 22a is accommodated and held in the accommodating portion 43a. Can be positioned. Therefore, in this clamp sensor 2, the tip surface 51a of the magnetic core 22a and the magnetic detection element 20 can be accurately aligned.

Next, as shown in FIG. 13, half of the magnetic core 22b (the same) is formed at the forming portion of the accommodating portion 43b (the portion forming the accommodating portion 43b together with the half body 32b) in the half body 31b constituting the case portion 21b of the clamp portion 11b. Insert (half of the back side of the paper in the figure).

Subsequently, as shown in FIG. 14, half of the magnetic core 22b (in the same figure) is formed at the forming portion of the accommodating portion 43b (the portion forming the accommodating portion 43b together with the half body 31b) in the half body 32b constituting the case portion 21b. The half body 31b and the half body 32b are fitted while fitting (the half in front of the paper surface). As a result, as shown in FIG. 15, the clamp portion 11b is assembled.

Next, as shown in FIG. 16, the base end portion 112a of the clamp portion 11a and the base end portion 112b of the clamp portion 11b are fitted to each other, and subsequently, an insertion hole formed in the base end portion 112a of the clamp portion 11a. The support shaft 25 (see FIG. 5) is inserted through the insertion hole 113b formed in the base end portion 112 of the 113a and the clamp portion 11b to connect the base end portions 112a and 112b. As a result, the clamp sensor 2 is assembled as shown in FIG.

Next, the clamp sensor 2 is attached to the half body 64a (see FIG. 1) constituting the main body case 64 of the main body portion 3, and then the half body 64b (see the figure) constituting the main body case 64 is fitted into the half body 64a. Match and fix. With the above, the assembly of the clamp meter 1 is completed.

Next, the usage of the clamp meter 1 will be described with reference to the drawings.

For example, when measuring the current value of the current flowing through the electric wire 100 shown in FIG. 4, the dial 62b (see FIG. 1) in the operation unit 62 of the main body unit 3 is operated to turn on the power. Next, the electric wire 100 is clamped by the clamp sensor 2 (each clamp portion 11). Specifically, as shown in FIG. 2, the lever 44b of the clamp portion 11b in the clamp sensor 2 is pushed in. At this time, as shown in the figure, the clamp portion 11a rotates about the support shaft 25 (see FIG. 4), and the tip portion 111b of the clamp portion 11b separates from the tip portion 111a of the clamp portion 11a. As a result, the clamp sensor 2 is opened.

Subsequently, the electric wire 100 is passed through the gap between the tip portions 111 of each clamp portion 11, and then the clamp sensor 2 is brought into contact with each tip portion 111 of each clamp portion 11 by releasing the pushing of the lever 44b. Is closed. As a result, as shown in FIG. 4, the electric wire 100 is clamped (surrounded) by each clamp portion 11.

In this case, in this clamp sensor 2, the cap 24 attached to the tip portion 23a of the flexible substrate 23 has an insulating property. Therefore, for example, when the electric wire 100 is clamped, the tip portion 111a of the clamp portion 11a and the electric wire 100 come into contact with each other to damage the tip portion 41a of the case portion 21a, which deteriorates the insulating function of the case portion 21a. Even so, the magnetic detection element 20 can be insulated by the cap 24.

On the other hand, when a current is flowing through the electric wire 100, a magnetic field is generated around the electric wire 100, and the magnetic detection element 20 detects the magnetic flux induced in the magnetic cores 22a and 22b by the magnetic field and outputs a detection signal.

Here, in this clamp sensor 2, as described above, the tip surface 51a of the magnetic core 22a and the magnetic detection element 20 can be accurately aligned. Therefore, in this clamp sensor 2, the deterioration of the magnetic field detection accuracy due to the positional deviation between the tip surface 51a of the case portion 21a and the magnetic detection element 20 is prevented, and the magnetic field detection accuracy can be sufficiently improved. It is possible. Further, in the clamp sensor 2, the central portion of the magnetic detection element 20 is located at the central portion between the distal end surfaces 51 of each magnetic core 22 in a state where the distal end portions 111 of each clamp portion 11 are in contact with each other. The tip portion 23a of the flexible substrate 23 is held by the holding portion 44a. Therefore, in this clamp sensor 2, the electric wire 100 is clamped by each clamp portion 11 as compared with the conventional configuration in which the tip portion 23a of the flexible substrate 23 is adhered and fixed to the tip surface 51 of the magnetic core 22. It is possible to detect the magnetic field generated in the electric wire 100 in a state where the influence of the change in the magnetic flux density of each magnetic core 22 due to the change in the distance between the electric wire 100 and each clamp portion 11 is sufficiently suppressed.

Subsequently, the processing unit 63 measures the current value (measured quantity) of the current flowing through the electric wire 100 based on the detection signal (measured quantity detected by the clamp sensor 2) output from the magnetic detection element 20. Next, the processing unit 63 causes the display unit 61 to display the measured current value.

As described above, according to the clamp sensor 2 and the clamp meter 1, the cap 24 having the flexibility to cover the tip portion 23a of the flexible substrate 23 and the clamp portion 11a rather than the accommodating portion 43a of the case portion 21a of the clamp portion 11a. The tip of the flexible substrate 23 formed on the tip 111a side and to which the cap 24 is attached is accommodated, and the magnetic detection element 20 is separated from the tip surface 51a of the magnetic core 22a toward the tip 111a. By providing the holding portion 44a capable of holding the portion 23a, the magnetic detection element 20 is defined by a simple operation of accommodating the tip portion 23a with the cap 24 attached in the holding portion 44a of the case portion 21a. The tip portion 23a can be reliably held in the state of being positioned at the position. Therefore, according to the clamp sensor 2 and the clamp meter 1, the tip surface 51a of the magnetic core 22a in a state of being accommodated and held in the accommodating portion 43a can be accurately aligned with the magnetic detection element 20. Therefore, according to the clamp sensor 2 and the clamp meter 1, the magnetic field detection accuracy is sufficiently improved by preventing the magnetic field detection accuracy from being lowered due to the positional deviation between the tip surface 51a of the case portion 21a and the magnetic detection element 20. Can be improved.

Further, according to the clamp sensor 2 and the clamp meter 1, the cap 24 has an insulating property, so that, for example, when the electric wire 100 is clamped, the tip portion 111a of the clamp portion 11a and the electric wire 100 come into contact with each other. Even if the tip portion 41a of the case portion 21a is damaged and the insulating function of the case portion 21a deteriorates, the magnetic detection element 20 can be reliably insulated to detect the magnetic field.

Further, according to the clamp sensor 2 and the clamp meter 1, the tip portion 23a of the flexible substrate 23 is separated from the opening portion 24a by forming the cap 24 in the shape of a flat bag having a rectangular flat bag shape in a plan view having an opening portion 24a on one side. Although the work of inserting the flexible substrate 23 along the length direction is easy, the cap 24 can be reliably attached to the tip portion 23a, so that the assembly efficiency can be sufficiently improved.

Further, in the clamp sensor 2 and the clamp meter 1, the central portion of the magnetic detection element 20 is located at the central portion between the distal end surfaces 51 of each magnetic core 22 in a state where the distal end portions 111 of each clamp portion 11 are in contact with each other. The holding portion 44a is configured so that the tip portion 23a of the flexible substrate 23 can be held so as to be positioned. Therefore, according to the clamp sensor 2 and the clamp meter 1, the electric wire 100 is compared with the conventional configuration in which the tip portion 23a of the flexible substrate 23 is adhered and fixed to the tip surface 51 of one of the magnetic cores 22. It is possible to sufficiently suppress the influence of the change in the magnetic flux density of each magnetic core 22 due to the change in the distance between the electric wire 100 and each clamp portion 11 when the wire 100 is clamped by each clamp portion 11. Therefore, according to the clamp sensor 2 and the clamp meter 1, the detection accuracy of the magnetic field generated in the electric wire 100 is sufficiently improved by preventing the detection accuracy from being lowered due to the influence of the change in the magnetic flux density of each magnetic core 22. Can be done.

Further, according to the clamp sensor 2 and the clamp meter 1, the tip of the flexible substrate 23 faces the center of the tip surface 51a of the magnetic core 22a and the center of the facing surface facing the tip surface 51a of the magnetic detection element 20. By configuring the holding portion 44a so that the portion 23a can be held, the magnetic field detection accuracy can be further improved as compared with the configuration in which the center of the tip surface 51a and the center of the magnetic detection element 20 do not face each other. ..

The configuration of the clamp sensor and the measuring device is not limited to the above configuration. For example, the example applied to the configuration in which the flexible substrate 23 is housed in the clamp portion 11a as one of the clamp portions 11 has been described above, but the flexible substrate 23 is mounted on the clamp portion 11b as one of the clamp portions 11. It can also be applied to containment configurations.

Further, the example applied to the configuration in which the flexible substrate 23 is arranged so as to extend along the tip surface 51a and the inner peripheral surface 53a of the magnetic core 22a has been described above, but the tip surface 51a and the outer peripheral surface 54a of the magnetic core 22a ( It can also be applied to a configuration in which the flexible substrate 23 is arranged so as to extend along (see FIGS. 9 and 10). Further, it can be applied to a configuration in which the flexible substrate 23 is arranged so as to extend along the tip surface 51a, the inner peripheral surface 53a, and the outer peripheral surface 54a of the magnetic core 22a.

Further, the configuration example in which the clamp portion 11b is rotatable and the clamp portion 11a is fixed in a non-rotating state has been described above, but the clamp portion 11a is rotatable and the clamp portion 11b is fixed in a non-rotating state. It is also possible to adopt the configuration that has been adopted. Further, it is also possible to adopt a configuration in which both the clamp portions 11a and 11b are rotatable.

Further, as an example of the cover, an example using a cap 24 formed in a flat bag shape having a rectangular flat view having an open portion 24a on one side (one end side) of the short side has been described above, but one side of the long side. A cap formed in a rectangular flat bag shape in a plan view having an open portion (on one end side) can also be used as a cover. When this cap is used, the cap 24 can be reliably and easily attached to the tip portion 23a by inserting the tip portion 23a of the flexible substrate 23 from the open portion along the width direction of the flexible substrate 23. Further, it is possible to adopt a configuration in which the tip portion 23a is covered with the sheet-shaped cover (mounted so as to wrap the tip portion 23a) by using the cover formed in the shape of a sheet.

1 Clamp meter 2 Clamp sensor 11a, 11b Clamp part 20 Magnetic detection element 21a, 21b Case part 22a, 22b Magnetic core 23 Flexible substrate 23a Tip part 24 Cap 24a Open part 41a, 41b Tip part 43a Accommodation part 44a Holding part 45a Support protrusion 51a Tip surface 53a Inner peripheral surface 54a Outer surface surface 63 Processing unit 100 Wires 111a, 111b Tip

Claims (6)

A state in which at least one of the case portion and the magnetic core housed in the accommodating portion in the case portion is rotatably configured so that the respective tip portions can be opened and closed, and the respective tip portions are in contact with each other. A pair of clamp portions capable of clamping the measurement target, at least one of the inner peripheral surface and the outer peripheral surface of the magnetic core housed in any one of the clamp portions, and extending along the tip surface of the magnetic core. A detection element for detecting the amount to be detected for the measurement target is mounted on the opposite portion facing the tip surface while being housed in the case portion of one of the clamp portions in a state of being arranged so as to exist. A clamp sensor with a strip-shaped flexible substrate.
A cover that is configured to be mountable on the flexible substrate and has flexibility to cover the facing portion in the mounted state is provided.
The case portion of any one of the clamp portions can accommodate the facing portion of the flexible substrate formed on the tip end side of the accommodating portion of the case portion and to which the cover is attached. A clamp sensor having a holding portion configured to hold the facing portion in a state where the detection element is separated from the tip surface of the magnetic core toward the tip portion side. The clamp sensor according to claim 1, wherein the cover is configured to have an insulating property. The cover is formed in a flat bag shape having an opening portion on one end side, and is configured so that one end portion of the flexible substrate can be inserted from the opening portion along the length direction of the flexible substrate. The clamp sensor according to claim 1 or 2. The holding portion is flexible so that the central portion of the detection element is located at the central portion between the distal end surfaces of the magnetic cores in a state where the distal end portions of the clamp portions are in contact with each other. The clamp sensor according to any one of claims 1 to 3, which is configured to be able to hold the facing portion of the substrate. The holding portion is the flexible substrate so that the center of the tip surface of the magnetic core in one of the clamp portions and the center of the facing surface facing the tip surface of the detection element face each other. The clamp sensor according to any one of claims 1 to 4, which is configured to be able to hold the facing portion. A measuring device including the clamp sensor according to any one of claims 1 to 5 and a measuring unit that measures a measured amount for the measurement target based on the detected amount detected by the clamp sensor.

Images