JP2009257906A - Resistance measuring device and resistance measuring method of group conductive wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resistance measuring device and a resistance measuring method of group conductive wires for precisely measuring the resistance of group conductive wires such as pair wires and the like. <P>SOLUTION: A resistance measuring device 100 which is a resistance measuring device with four-terminal method includes a probe 2, having flexibility, of a voltage measuring system and a probe 3, also having flexibility, of a current measuring system, and both probes are wound up to a lead 12a of a coil which is an inspection body from the opposite directions respectively. Under such a state, the probe 2 and the probe 3 are moved in a direction opposite to each other so as to pull the probe 2 and the probe 3 with each other. Then a voltage value and a current value are measured while the probe 2 and the probe 3 pull the lead 12a with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resistance measuring device and a resistance measuring method for an assembled conductor composed of at least two conductors. More specifically, the present invention relates to a resistance measuring apparatus and a resistance measuring method for an assembled wire that performs resistance measurement by a four-terminal method.

  In recent years, hybrid vehicles, electric vehicles, etc. have attracted attention from the viewpoint of low pollution. Since a vehicle drive motor mounted on a hybrid vehicle or the like requires high-performance performance characteristics with high current and high voltage, various performance inspections are performed on the components of the motor.

  For example, the four-terminal method is applied to the resistance measurement of the conducting wire that constitutes the motor coil. In the measurement by the 4-terminal method, a measurement system that applies a direct current to both ends of the conducting wire to be measured and a measurement system that measures the voltage drop of the conducting wire due to this direct current are arranged. Based on the voltage and current values between the ends of the conductor fixed to the terminal, the electrical resistance between the ends of the conductor is measured.

For measuring the resistance of a conducting wire by the four-terminal method, for example, Patent Document 1 discloses a measuring terminal for winding and fixing a binding wire having conductivity around an object to be measured. In the measurement terminal of Patent Document 1, a wide contact area is formed between the object to be measured and the bind wire by winding the bind wire, and the electrical connection is ensured and the measurement can be performed with high accuracy.
Japanese Utility Model Publication No. 6-60070

  However, the conventional resistance measurement described above has the following problems. That is, as the conducting wire constituting the coil, an assembled conducting wire composed of two or more conducting wires is often adopted. In order to measure the resistance between both ends of such an assembly conductor, as shown in FIG. 9, the conductors 93 and 94 are held together by the probes 91 and 92 which become measurement terminals. In the four-terminal method, one probe 91 serves as a current measurement system, and the other probe 92 serves as a voltage measurement system measurement terminal. When fixing a plurality of conducting wires with such a measurement terminal, if the wire diameters of the conducting wires 93 and 94 are slightly different, the probes 91 and 92 are difficult to contact the conducting wire having a small diameter (the conducting wire 94 in FIG. 9). Therefore, accurate measurement cannot be performed.

  The measurement terminal disclosed in Patent Document 1 describes the fixing of a stranded wire object to be measured. However, when this measurement terminal is applied to the four-terminal method, it is necessary to tighten the object to be measured using dedicated measurement terminals for all four terminals. Therefore, it takes time to install the measurement terminals.

  The present invention has been made to solve the problems of the conventional resistance measurement described above. That is, an object of the present invention is to provide a resistance measuring device and a resistance measuring method for an assembled wire capable of measuring the resistance of an assembled wire such as a paired wire with high accuracy.

  A resistance measuring device for solving this problem is a resistance measuring device for a combined conductor composed of at least two conductors, a first conductor probe electrically connected to a first measuring system, and a second conductor measuring instrument. The first conductor probe and the second conductor in a state in which the second conductor probe electrically connected to the measurement system, the first conductor probe and the second conductor probe are wound around the assembled conductor of the subject from opposite directions. A moving means for moving at least one of the probe in a direction away from the other is provided.

  The resistance measurement apparatus of the present invention includes at least two types of measurement systems, that is, a first measurement system and a second measurement system, the first conductor probe is connected to the first measurement system, and the second conductor probe is the first measurement system. 2 is connected to the measurement system. An example of a resistance measuring device including a plurality of measuring systems is a resistance measuring device based on a four-terminal method including a current measuring system and a voltage measuring system. The first conductor probe and the second conductor probe are provided so as to be movable in a direction away from each other by the moving means. In this movement, both conductor probes may move away from each other, or only one conductor probe may move away from the other conductor probe.

  That is, the resistance measuring device of the present invention places the first conductor probe and the second conductor probe around the assembled wire of the subject from opposite directions at the time of resistance measurement. The term “wrapped” as used herein means that at least a part of the assembly wire is wound and hooked. For example, a belt-shaped probe may be wound, or a probe having a hook-shaped tip may be hooked. In this state, at least one of the first conductor probe and the second conductor probe is moved in a direction away from the other so that the first conductor probe and the second conductor probe pull the assembly wire in opposite directions from both sides. By pulling the first conductor probe and the second conductor probe, each conductor probe comes into contact with at least one of the conductors constituting the assembly conductor. Furthermore, the conducting wires constituting the assembled conducting wire are surely brought into contact with each other. As a result, each conductor probe is in reliable electrical contact with all conductors. Therefore, accurate resistance measurement can be performed.

  In the resistance measuring apparatus of the present invention, the first conductor probe and the second conductor probe are combined and fixed to the assembly wire. Therefore, it is possible to fix the two terminals to the assembly wire by a single mounting operation. Therefore, it is less time-consuming to install than measuring terminals fixed to assembly wires.

  Further, the resistance measuring device of the present invention further includes an insulating member that is disposed between the first conductor probe and the second conductor probe and electrically insulates between the first conductor probe and the second conductor probe. Good. That is, if a short circuit occurs between the first conductor probe and the second conductor probe, accurate resistance measurement cannot be performed. Therefore, by placing an insulating member between the first conductor probe and the second conductor probe, it is possible to perform resistance measurement with higher reliability.

  In addition, it is better that the insulating member is attached to at least one of the first conductor probe and the second conductor probe. That is, since the insulating member is integrally provided on at least one of the first conductor probe and the second conductor probe, it is possible to perform highly reliable resistance measurement with a simple configuration.

  In addition, the resistance measuring device according to the present invention is preferably provided with a first guide member that is positioned downstream of the first conductor probe and the second conductor probe and surrounds the assembly conductor as viewed from the insertion direction of the assembly conductor. In addition, the resistance measuring device of the present invention preferably includes a second guide member that is positioned upstream of the first conductor probe and the second conductor probe and surrounds the assembly conductor as viewed from the insertion direction of the assembly conductor. That is, the first guide member or the second guide member surrounding the assembly wire receives a reaction force when the two conductor probes are pulled together and suppresses deformation of the assembly wire.

  The present invention is a resistance measuring method for a set of conductors composed of at least two conductors, the first conductor probe being electrically connected to the first measurement system, and being electrically connected to the second measurement system. The first conductor probe and the second conductor so that the first conductor probe and the second conductor probe pull the assembly wire in opposite directions in a state where the second conductor probe is wound around the assembly conductor of the subject. A resistance measurement method is provided, wherein each measurement system measures electrical characteristics in a state in which at least one of the probes is moved and the first conductor probe and the second conductor probe pull the assembled conductor. .

  ADVANTAGE OF THE INVENTION According to this invention, the resistance measuring apparatus and resistance measuring method of an assembly wire which can perform resistance measurement of assembly wires, such as a pair line, with high precision are implement | achieved.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In the present embodiment, the present invention is applied to a cassette coil resistance inspection device used for a vehicle drive motor.

[Configuration of coil]
First, a configuration example of a cassette coil as a subject will be briefly described. FIG. 1 is a perspective view showing an appearance of a cassette coil. As shown in FIG. 1, the cassette coil 10 is formed by winding a coiled wire 12 around a coil bobbin 11 to form a coil. The assembled conducting wire 12 of this embodiment is composed of two conducting wires 123 and 124. The coil bobbin 11 has a cylindrical body 14 around which the assembly conductor 12 is wound, and a pair of flange portions 15 and 16 located at both ends of the cylindrical body 14.

  In the cassette coil 10, a lead 12 a that is a winding start portion of the assembly conductor 12 and a lead 12 b that is a winding end portion are taken out from the flange portion 15. The leads 12a and 12b are gripped by the flange 15 in a non-contact manner. The insulating coatings 120a and 120b are peeled off at the tips of the leads 12a and 12b, and the conductor portions are exposed (hereinafter, the exposed portions of the conductors of the leads 12a and 12b are referred to as “film peeling portions 121a and 121b”). . The leads 12a and 12b are formed in advance for caulking with the bus bar module 18 described later.

  The cassette coil 10 is assembled to the stator core 13 as shown in FIG. Specifically, the cassette coil 10 is inserted into each tooth 17 provided on the inner diameter of the stator core 13. Then, the film peeling part 121a of the lead 12a of the cassette coil 10 and the film peeling part 121b of the lead 12b are caulked and connected to the terminals 18a and 18b of the bus bar module 18, respectively. Further, an insulating paper (insulator) 19 is provided between the cassette coils 10 and 10 in order to insulate the cassette coils 10 and 10 from each other. A concentrated winding motor for driving a vehicle is configured by arranging the rotor at the center of the stator configured as described above.

[Configuration of resistance measuring device]
[Electrical connection configuration of resistance measuring device]
Next, the coil resistance measuring apparatus 100 will be described. In the resistance measurement apparatus 100 of this embodiment, the cassette coil 10 shown in FIG. 1 is used as a subject (test work).

  The resistance measuring device 100 of this embodiment is a device that performs resistance measurement by a four-terminal method, and includes a voltage measuring system and a current measuring system. More specifically, as shown in FIG. 3, the resistance measuring apparatus 100 includes a probe 2 which is a connection terminal of the voltage measurement system, a probe 3 which is a connection terminal of the current measurement system, and a power source, and a current value and And a resistance measuring unit 8 that calculates a resistance value based on the voltage value.

[Configuration of connection terminals]
First, the structure of the connection terminal of the resistance measuring apparatus 100 attached to each lead 12a, 12b of the assembly wire 12 of the cassette coil 10 will be described.

  As shown in FIG. 4, the resistance measuring apparatus 100 includes a probe 2 for current measurement system, a probe 3 for voltage measurement system, an upstream guide member 4, and a downstream guide member 5, and includes a lead 12a. The upstream guide member 4, the probe 2, the probe 3, and the downstream guide member 5 are arranged in this order in the insertion direction (the arrow direction in FIG. 4). Each member has an annular shape and is overlapped to form one through hole. The film peeling part 121a of the lead 12a is inserted so as to penetrate the through hole. The configuration of the connection terminal connected to the lead 12b is the same.

  The probe 2 is covered with an insulating rubber 21 at a portion facing the probe 3. On the other hand, the portion of the probe 3 facing the probe 2 is covered with an insulating rubber 31. That is, the insulating rubbers 21 and 31 prevent a short circuit between the probes 2 and 3.

  The probe 2 is made of a metal having flexibility, and as shown in FIG. 5, the probe 2 is curved in a U shape, and both ends thereof are supported by a support rod 22 having rigidity. The probe 3 has the same configuration as that of the probe 2, is curved in a U shape, and both ends thereof are supported by a support bar 32 having rigidity. Then, the film peeling portion 121a of the lead 12a is inserted into the annular region 25 formed by overlapping the probe 2 and the probe 3.

  The support rods 22 and 32 for supporting the probes 2 and 3 are provided so as to be movable in a direction orthogonal to the insertion direction of the lead 12a. That is, as shown in FIG. 6A, the support rods 22 and 32 are moved in a direction approaching each other, so that the annular region 25 is expanded and the assembly wire 12 can be inserted into the annular region 25. On the other hand, as shown in FIG. 6B, the support rods 22 and 32 are moved away from each other, thereby narrowing the annular region 25 so that the two conductors 123 and 124 can be held together.

  The upstream guide member 4 is disposed upstream of the probe 2 in the insertion direction of the lead 12a. The upstream guide member 4 is a cylinder made of an insulating material, and the lead 12a penetrates the inside thereof. The upstream guide member 4 surrounds the lead 12a, receives a reaction force accompanying the movement of the probe 2, and suppresses deformation of the lead 12a. Further, it also serves as a guide function for introducing the tip of the lead 12a into the annular region 25 formed by the probes 2 and 3.

  The downstream guide member 5 is disposed on the downstream side of the probe 3 in the insertion direction of the lead 12a. The downstream guide member 5 has the same configuration as the upstream guide member 4 and is a cylindrical body made of an insulating material, and the lead 12a penetrates through the inside thereof. The downstream guide member 5 surrounds the lead 12a, receives a reaction force accompanying the movement of the probe 3, and suppresses deformation of the lead 12a. Note that the guide member 5 does not necessarily have to penetrate the tip of the lead 12a, and may completely cover the tip of the lead 12a.

[Probe installation procedure]
Next, a procedure for attaching the probes 2 and 3 to the lead 12a of the coil resistance measurement apparatus 100 will be described.

  First, the support rods 22 and 32 are moved toward each other to widen the annular region 25 into which the lead 12a is inserted. Then, as shown in FIG. 4, the lead 12 a is inserted from the upstream guide member 4, and the tip of the lead 12 a is protruded from the lower guide member 5. As a result, the probe 2 and the probe 3 are wound around the lead 12a as the subject from opposite directions.

  Next, as shown in FIG. 7, the support bar 22 and the support bar 32 are moved away from each other. As a result, the probe 2 and the probe 3 pull the lead 12a (two conducting wires 123 and 124) in the opposite direction. At this time, the probe 2 and the probe 3 are in contact with at least one of the conductive wires 123 and 124 to hold the conductive wires 123 and 124 together, and the probe 2 and the probe 3 are simultaneously fixed to the lead 12a. Also, the probe 2 and the probe 3 pressurize the lead wires 123 and 124 by pulling the lead 12a in opposite directions from both sides, so that the film peeling portion 121a of the lead wire 123 and the film peeling portion 121a of the lead wire 124 are reliably in contact with each other. To do. Thus, if each probe 2 and 3 is in contact with at least one of the conductive wires 123 and 124, it is electrically connected to both the conductive wires 123 and 124.

  Further, when the lead 12 a is pulled by the probes 2 and 3, the lead 12 a is surrounded by the upper guide member 4 and the lower guide member 5. For this reason, the upper guide member 4 and the lower guide member 5 receive a reaction force accompanying pulling, and the deformation of the lead 12a is suppressed. By suppressing the deformation of the lead 12a, the reworking of the lead 12a is reduced and the caulking with the terminal 18a of the module 18 (see FIG. 2) is facilitated.

  Thereafter, an inspection voltage is applied between the leads 12a and 12b, and a current value and a voltage value between the leads 12a and 12b are detected. Based on the detected current value and voltage value, the electrical resistance between the leads 12a and 12b is calculated.

  FIG. 8 shows an image of the connection state of the resistance measuring apparatus 100. The resistance measurement unit 8 includes a connection terminal of a current measurement system (solid line in FIG. 8) and a connection terminal of a voltage measurement system (broken line in FIG. 8). , Connect the terminals of the current measurement system to the probe 3. Insulating rubbers 21 and 31 are arranged between the probes 2 and 3, and the contact between the probe 2 and the probe 3 is suppressed. The resistance measurement unit 8 has a built-in power supply and detects a current value and a voltage value between the leads 12a and 12b. The resistance measuring apparatus 100 calculates the electrical resistance between the leads 12a and 12b based on the detected current value and voltage value.

  As described above in detail, the resistance measuring apparatus 100 according to the present embodiment is a resistance measuring apparatus based on the four-terminal method, and includes a flexible voltage measuring probe 2 and a flexible current measuring system. The probe 3 is wound around the lead 12a from opposite directions. In this state, the probe 2 and the probe 3 move the leads 12a in opposite directions so as to pull each other from both sides. As a result, each of the probes 2 and 3 comes into contact with at least one of the conducting wires 123 and 124 constituting the assembled conducting wire 12. Furthermore, the probe 2 and the probe 3 are pulled together, so that the conducting wires 123 and 124 constituting the assembly conducting wire 12 are surely brought into contact with each other. As a result, the probes 2 and 3 are surely in electrical contact with both the conductive wires 123 and 124. Therefore, accurate resistance measurement can be performed.

  In the resistance measuring device 100, the probe 2 and the probe 3 are combined and attached to the assembly wire 12. Therefore, it is possible to fix the two terminals to the lead 12a by a single mounting operation. Therefore, it is less time-consuming to install than measuring terminals fixed to assembly wires.

  The probes 2 and 3 are flexible and bend according to the wire diameters of the conducting wires 123 and 124 to come into contact with these conducting wires. Therefore, the contact area between each probe and the conductor is large, and the measurement is more stable. Further, the present invention can also be applied to various assembled wires having different wire diameters and numbers of wires.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in the present embodiment, the subject is a pair wire composed of two conducting wires, but the present invention is not limited to this. That is, even three or more assembled conductors are applicable.

  In this embodiment, the probe 2 and the probe 3 are configured to move with respect to each other and pull the lead. However, one probe is fixed and only the other probe moves to pull the lead. You may comprise so that it may fit.

  Further, in the embodiment, the probe 2 and 3 bent on the U-shape are wound around the assembly wire, but the method of setting the wound state is not limited to this. That is, it is sufficient that at least a part of the assembly wire is wound and hooked. For example, a wire-like probe may be wound, or a probe having a hook-like tip may be hooked.

  In this embodiment, the vehicle drive motor is inspected, but the present invention is not limited to this. That is, you may apply this invention to the test | inspection of the motor for household appliances.

It is a figure which shows schematic structure of a cassette coil. It is a figure which shows schematic structure of the stator which mounted | wore with the cassette coil. It is a figure which shows the electrical structure of a resistance measuring apparatus. It is a figure (after probe insertion) which shows schematic structure of the connecting terminal of a resistance measuring device. It is a figure which shows schematic structure of a probe. It is a figure which shows the movement outline of a probe. It is a figure (after a probe movement) which shows schematic structure of the connecting terminal of a resistance measuring device. It is a figure which shows the image of the connection state of a resistance measuring apparatus. It is a figure which shows schematic structure of the probe head of the resistance measuring apparatus concerning the conventional form.

Explanation of symbols

2 Probe 3 Probe 4 Upstream guide member 5 Downstream guide member 8 Resistance measurement unit 10 Cassette coil 12 Assembly wire 21 Insulation rubber 22 Support rod 31 Insulation rubber 32 Support rod 100 Resistance measurement device

Claims (9)

In a resistance measuring device for a combined conductor consisting of at least two conductors,
A first conductor probe electrically connected to the first measurement system;
A second conductor probe electrically connected to the second measurement system;
A direction in which at least one of the first conductor probe and the second conductor probe is separated from the other in a state where the first conductor probe and the second conductor probe are wound around the assembly conductor of the subject from opposite directions. A resistance measuring apparatus comprising: a moving means for moving the resistance. In the assembly wire resistance measuring device according to claim 1,
A resistance measuring apparatus, comprising: an insulating member disposed between the first conductor probe and the second conductor probe, and electrically insulating between the first conductor probe and the second conductor probe. . In the assembly wire resistance measuring device according to claim 2,
The resistance measuring apparatus, wherein the insulating member is attached to at least one of the first conductor probe and the second conductor probe. In the resistance measuring apparatus of the assembly wire as described in any one of Claims 1-3,
A resistance measuring apparatus comprising a first guide member positioned downstream of the first conductor probe and the second conductor probe as viewed from the insertion direction of the assembly conductor and surrounding the assembly conductor. In the resistance measuring apparatus of the assembly wire as described in any one of Claims 1-4,
A resistance measuring device comprising a second guide member positioned upstream of the first conductor probe and the second conductor probe and surrounding the assembly wire as viewed from the insertion direction of the assembly wire. In a method for measuring resistance of an assembled wire consisting of at least two wires,
In a state where a first conductor probe electrically connected to the first measurement system and a second conductor probe electrically connected to the second measurement system are wound around the assembly wire of the subject, the first conductor Moving at least one of the first conductor probe and the second conductor probe so that the probe and the second conductor probe pull the assembly wire in opposite directions;
A resistance measuring method, wherein each measurement system measures an electrical characteristic in a state where the first conductor probe and the second conductor probe pull the assembly wire. In the method for measuring resistance of a conductive wire according to claim 6,
A resistance measuring method, comprising: disposing an insulating member between the first conductor probe and the second conductor probe. In the method for measuring resistance of the assembled wire according to claim 6 or 7,
A first guide member is disposed downstream of the first conductor probe and the second conductor probe when viewed from the insertion direction of the assembly conductor, and the assembly wire is surrounded by the first guide member. How to measure resistance. In the method for measuring resistance of an assembled wire according to any one of claims 6 to 8,
A second guide member is disposed upstream of the first conductor probe and the second conductor probe when viewed from the insertion direction of the assembly conductor, and the assembly wire is surrounded by the second guide member. How to measure resistance.

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