JPH099576A - Method and apparatus for measuring resistance value of coil - Google Patents

Abstract

PURPOSE: To provide a method and an apparatus for measuring the resistance value of a coil capable of judging the propriety of the coil in the case of manufacturing the coil and improving the production efficiency by reducing the fraction defective at the time of manufacturing an armature. CONSTITUTION: A lead wire is wound on an insulating member 14 wound on a winding jig 12. The wire is coated with adhesive made of thermoplastic resin. Then, when a power source 26 is connected to the wire and the wire is conducted to be heated, the adhesive is melted and the wound lead is impregnated with the adhesive. Compressed air is discharged to the wire by compressed air nozzles 18a, 18b to cool the wire. When the fact that the wire is cooled to a predetermined temperature is detected by a temperature sensor 16, the resistance value of the wound wire is measured by a resistance value measuring unit 28. The coil judged to be non-defective from the measured result of the resistance value is assembled with an armature. On the other hand, the coil judged to be defective is regenerated or discarded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring a resistance value of a coil when manufacturing the coil.

[0002]

2. Description of the Related Art Conventionally, when measuring a resistance value of a coil mounted on an armature of an electric motor, a plurality of coils are mounted on an iron core, and terminals of each coil are connected to a substrate or the like to manufacture an armature. Then, the resistance value of the coil is measured by connecting the resistance value measuring means to the measuring terminal of the substrate or the like. If the resistance value is within a predetermined range, the armature is determined to be a non-defective product, and if it deviates from the predetermined range, the armature is determined to be a defective product and a process such as disposal is performed.

[0003]

However, in the method for measuring the resistance value of the coil according to the above-mentioned prior art, since the resistance value is measured in a state where all the coils are attached to the armature in advance, Of the coils attached to the child,
It is difficult to determine which coil is defective. That is, even if a coil that is a good product is included, when the relevant armature is determined to be a defective product, the coil that is a good product is also discarded, so that the defective rate of the armature can be reduced. Was difficult.

The present invention has been made to solve the above problems, and determines the quality of individual coils when manufacturing the coils, and consequently reduces the defective rate of parts such as armatures. At the same time, it is an object of the present invention to provide a method for measuring a resistance value of a coil and a device therefor capable of achieving cost reduction.

[0005]

In order to achieve the above-mentioned object, the present invention provides a method for measuring the resistance value of a coil, in which a current is passed through the coil to generate heat to fix the coil. Of melting an adhesive made of a thermoplastic resin into a coil to permeate the coil, cooling the coil heated by the energization, and measuring a resistance value of the coil when the coil is cooled to a predetermined temperature. And a process.

Further, according to the present invention, a conductive wire is wound around a winding jig to form a coil, and an adhesive agent made of a thermoplastic resin is supplied to the coil to solidify the coil and the resistance to the coil is fixed. In the device for measuring the value,
A power supply device that heats the coil by supplying a current to the coil, a temperature measuring unit that measures a temperature of the coil, and a resistance value measuring unit that measures a resistance value of the coil, and a temperature detected by the temperature measuring unit. Is a predetermined temperature, the resistance value measuring means is energized to measure the resistance value of the coil at the predetermined temperature to judge the quality of the coil.

[0007]

According to the present invention, a wire is wound around a winding jig to form a coil, and an adhesive made of a thermoplastic resin is supplied to the coil. Next, by connecting a power supply device to the coil and energizing the power supply device, a predetermined current is applied to the coil. As a result, the coil made of a thin conductive wire generates heat, the adhesive melts, penetrates between the conductive wires forming the coil, and the shape of the coil is fixed. Next, when the temperature of the coil reaches a predetermined temperature by the temperature measuring means, the resistance value measuring means is connected to the coil to measure the resistance value. Then, when the resistance value is within a predetermined range, this coil is determined as a non-defective product, and when it deviates from the predetermined range, it is determined as a defective product.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for measuring the resistance value of a coil according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to preferred embodiments in relation to an apparatus for carrying out the method.

In FIG. 1, reference numeral 10 indicates a coil measuring apparatus according to this embodiment. This measuring device 10
Basically, the winding jig 12, the insulating member 14 mounted on the winding jig 12, and the winding jig 12 are provided so as to be close to and away from the winding jig 12, and the temperature of the wound conductor wire is measured. Temperature sensor 16, compressed air nozzles 18a and 18b for cooling the wound conductor wire, an adhesive nozzle 20 for applying an adhesive made of a thermoplastic resin, and the wound conductor wire electrically connected to each other. The electrode 22 configured as possible, the power supply device 26 connected to the electrode 22 via the changeover switch 24, and the resistance value measuring device 28 are provided.

The winding jig 12 is made of a metallic material, and as shown in FIGS. 2a to 2d, a first side plate 32 defining a rectangular hole 30 and an inward projection. And a second side plate 36 having a protrusion 34. The first side plate 32 and the second side plate 36 are provided with inclined portions 38a and 38b, respectively, which are partially bent, so that the first side plate 32 and the second side plate 3 are provided.
One end of 6 is formed so as to be gradually narrowed, and hook portions 40a and 40b are formed near the ends of the inclined portions 38a and 38b so that the ends of the conductors engage with each other. The width W ₁ and the height H ₁ of the end portion 42 of the protrusion 34 are equal to the width W _{2 of} the hole portion 30,
The size is the same as the height H ₂ or slightly smaller.
A winding portion 46 is formed via a step portion 44 directed from the end portion 42 toward the main body side of the second side plate 36. As can be seen from the figure, the winding portion 46 is formed so as to be larger in width and height than the protrusion portion 34. In this case, the end portion 42 is inserted into the hole portion 30 of the first side plate 32. Then, the hole 3
The edge portion forming 0 engages with the step portion 44, and the first side plate 3
2 is detachably attached to the protrusion 34 (see FIG. 3).
The protrusion 34 is attached to a jig (not shown) that is connected to a rotary drive source (not shown), and when the rotary drive source is energized, the winding jig 12 is entirely centered around the protrusion 34. It is configured to rotate.

The insulating member 14 is a substantially rectangular plate-like body in which a thermoplastic resin film 48 and a PET film 50 are bonded together (see FIG. 4a). A protrusion 52 is formed at one end of the insulating member 14, and a hole 54 is formed at the other end for inserting the protrusion 52 (see FIG. 4B). Folding curves 56a and 56b are provided in parallel with the longitudinal direction of the insulating member 14, and the folding line 5
Folding curves 58a to 58c are provided at right angles to 6a and 56b. At this time, the distance between the folding curve 56a and the folding curve 56b is formed to be the same as the distance between the first side plate 32 and the second side plate 36 of the winding jig 12. Further, along the folding lines 58a to 58c, the folding lines 56a, 56b
Cutting portions 60a to 60f are formed by cutting out to the intersections of 56b and the folding curves 58a to 58c.

In the insulating member 14 thus formed,
The folding lines 58a to 58c are bent so that the surface of the thermoplastic resin film 48 is on the outside, and the protrusion 52 is inserted into the hole 54 (see FIG. 4c). Furthermore, the curve 5
6a and 56b are bent at right angles so that the surface of the thermoplastic resin film 48 faces inward, and the flange portions 62a and 62b.
Is formed.

The adhesive nozzle 20 is connected to an adhesive supply source (not shown), can approach and separate from the winding jig 12, and can move in the longitudinal direction of the protrusion 34 of the winding jig 12. It is possible (see FIG. 1).

The temperature sensor 16 can approach and separate from the winding jig 12, and detects the temperature of the conductive wire wound when approaching the winding jig 12.

On the other hand, bent metal plates 64a and 64b are arranged on the electrode 22 with a predetermined gap therebetween, and a plate-shaped insulating plate 66 is sandwiched between the metal plates 64a and 64b (see FIG. 5a), electrical insulation between the metal plate 64a and the metal plate 64b is achieved. The metal plate 64a,
V-shaped blades 68a, 68 at the tip of 64b
b is provided (see FIGS. 5a-5c).

A power supply device 26 and a resistance value measuring device 28 are connected to the electrode 22 via a changeover switch 24, and the power supply device 2 is switched by switching the changeover switch 24.
6 or the resistance value measuring device 28 is electrically connected to the metal plates 64a and 64b of the electrode 22 (see FIG. 1).
reference).

The compressed air nozzles 18a and 18b are configured to be able to approach and separate from the winding jig 12, and communicate with a compressed air supply source (not shown).

The coil measuring apparatus 10 according to this embodiment is basically constructed as described above, and its operation will be described below in connection with the measuring method according to this embodiment.

First, when the end 42 of the protrusion 34 of the second side plate 36 is inserted into the hole 30 of the first side plate 32, the hole 3
The first side plate 32 is mounted by engaging the step portion 44 at the edge portion forming 0, and the first side plate 32 and the second side plate 36 are arranged at a predetermined distance from each other and face each other (FIGS. 2d,
(See FIG. 3).

Next, the insulating member 14 is bent to surround the winding portion 46 of the protrusion 34, and the protrusion 5 of the insulating member 14 is formed.
2 into the hole 54 to attach the insulating member 14 to the winding jig 1
Wind around 2. In this case, the bent line 56a and the bent line 56b
Since the distance between the first side plate 32 and the second side plate 36 is substantially the same as the distance between the first side plate 32 and the second side plate 36, the flange portions 62a and 62b of the insulating member 14 contact the first side plate 32 and the second side plate 36, respectively. Become.

Next, one end of the conductor wire 70 is attached to the winding jig 1.
2 is engaged with the hook portion 40b of the second side plate 36 (see FIG. 6).
reference). When the protrusion 34 is rotated by urging a rotating device (not shown), the winding jig 12 rotates in the direction of arrow A, and the conductor 7 is attached to the insulating member 14 wound around the protrusion 34.
0 is wound. At this time, since the winding jig 12 is made of a metallic material, the tension applied to the conductor wire 70 can be increased. Further, since the winding of the conductive wire 70 is restricted by the first side plate 32 and the second side plate 36, the conductive wire 70 is wound and laminated inside the flange portions 62a and 62b of the insulating member 14.

After the winding jig 12 has rotated a predetermined number of times, the rotating device is stopped and the other end of the conductor 70 is hooked on the hook portion 40.
a and the other end side of the conducting wire 70 is connected to the hook portion 4
Cut so as to project slightly outward from 0a (see FIG. 7).

Next, the adhesive nozzle 20 is attached to the winding jig 1.
2 and the rotating device (not shown) is operated to bring the tip of the adhesive nozzle 20 close to the corner portion of the wound conducting wire 70 (see FIG. 8). The adhesive nozzle 2
0 is moved in the longitudinal direction of the protrusion 34 to urge an adhesive supply source (not shown), and the thermoplastic resin is applied in the width direction of the wound conductor wire 70, preferably at the four corners of the protrusion 34. Apply an adhesive consisting of.

Next, the hook portions 40a, 4 of the winding jig 12
A rotating device (not shown) is slightly actuated so that 0b is directed to the electrode 22 to bring the electrode 22 close to the winding jig 12 (see FIG. 9). Then, the blade portions 68a of the electrode 22 are attached to both ends of the conductor wire 70 protruding outward from the hook portions 40a and 40b.
68b engages with each other, and a part of the insulating coating 72 of the conducting wire 70 is peeled off by the blades 68a, 68b, so that the metal plates 64a, 64
b and the conductor wire 70 are in a state in which they can be electrically conducted (FIG. 5).
b, see FIG. 5c). At the same time, the temperature sensor 16 is brought close to the winding jig 12 to start measuring the temperature of the conductive wire 70 wound.

Next, when the changeover switch 24 is switched to electrically connect the electrode 22 and the power supply device 26 to energize the power supply device 26, an electric current is passed through the wound conducting wire 70 so that the conducting wire 70 is energized. 70 heats up.

As shown in FIG. 10, the adhesive made of the thermoplastic resin tends to melt and increase the adhesive strength when the temperature rises to about 140 ° C. Therefore, the adhesive made of the thermoplastic resin near this temperature. Conductive wire 7 that is melted and wound
Penetrate into the 0 gap. As a result, the thermoplastic resin film 48 of the insulating member 14 is melted and the insulating member 14 and the wound conducting wire 70 are integrated. At this time, since the wound conductor wire 70 and the winding jig 12 are separated by the insulating member 14, there is no concern that the conductor wire 70 and the winding jig 12 are bonded. When the temperature sensor 16 detects that the temperature of the wound conducting wire 70 has risen to 140 ° C.,
The supply of current from the power supply device 26 is stopped.

As described above, when it is confirmed that the adhesive made of the thermoplastic resin has melted and penetrated between the conductors 70, the changeover switch 24 is connected to the electrode 22 and the resistance value measuring device 28.
Are operated so as to be electrically connected to each other, and the compressed air nozzles 18a and 18b are brought close to the winding jig 12 (see FIG. 11).
reference). Therefore, when a compressed air supply source (not shown) is energized, compressed air is discharged to the conductive wire 70 that has generated heat, and the conductive wire 70
Is cooled and the adhesive made of a thermoplastic resin is solidified, and the wound conducting wire 70 is fixed by the adhesive.

Next, when the temperature sensor 16 detects 80 ° C. which is the upper limit value of the operating temperature range of the coil, the resistance value of the conducting wire 70 wound by the resistance value measuring device 28 is measured. At this time, the relationship between the resistance value and the temperature is in a proportional relationship as shown in FIG. 12, and the resistance value increases when the temperature is high and the resistance value decreases when the temperature is low. When this coil is at 80 ° C, the normal resistance value of the coil is about 10
mΩ, the allowable range is ± 5% of normal resistance value of 10 mΩ
If the measured resistance value is within a predetermined range, for example, within the range of 9.5 to 10.5 mΩ, it is determined that the coil is a good product, and if it is outside this range, it is determined as a defective product. .

After determining the quality of the coil in this way, the first side plate 32 is removed from the protrusion 34 of the second side plate 36, and the conducting wire 70 wound around the insulating member 14 is taken out.
The coil 74 is obtained (see FIG. 13).

The coil 74 determined to be a non-defective product is incorporated into an armature or the like based on the resistance value measurement result, and the coil 74 determined to be a defective product is recycled or discarded.

[0031]

According to the method for measuring the resistance value of the coil and the apparatus therefor according to the present invention, the following effects and advantages can be obtained.

When manufacturing a coil, it becomes possible to measure the resistance value of the coil to judge the quality of the coil, and the coil judged to be defective is not used for manufacturing an armature or the like. . Therefore, the defective rate of the parts at the time of manufacturing the armature and the like is reduced, and since only the parts judged to be good are used, waste is eliminated, cost reduction is achieved, and production efficiency is improved. Further, there is an effect that the quality of the defective coil can be confirmed and the cause thereof can be easily determined.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing a relationship between a measuring device and a winding jig according to an embodiment of the present invention.

FIG. 2a is a first view of the winding jig shown in FIG.
FIG. 2b is a side view of the side plate, FIG. 2b is a side view of the second side plate forming the winding jig, FIG. 2c is a plan view of the second side plate forming the winding jig, and FIG. It is a front view of the 2nd side plate which comprises.

FIG. 3 is a plan view of a winding jig.

FIG. 4a is a partial cross-sectional view of an insulating member forming a winding jig, FIG. 4b is a developed view of an insulating member forming a winding jig, and FIG. 4c is a winding jig. It is a perspective view which shows the usage method of the insulating member.

FIG. 5a is a perspective view of electrodes constituting a measuring device,
FIG. 5b is a side view of the metal plate forming the electrode, with some parts omitted, and FIG. 5c is a cross-sectional view showing the relationship between the metal plate forming the electrode and the conductor.

FIG. 6 is a partially omitted perspective view showing a method of using the winding jig.

FIG. 7 is a partially omitted perspective view showing a method of using the winding jig.

FIG. 8 is a partially omitted perspective view showing a state in which an adhesive is applied to a conductive wire wound around a winding jig.

FIG. 9 is a partially omitted perspective view showing a method of using the measuring device and the winding jig.

FIG. 10 is a graph showing the relationship between the adhesive temperature and the adhesive strength.

FIG. 11 is a partially omitted perspective view of the measuring device and a state in which the adhesive on the conducting wire wound around the winding jig is being cooled.

FIG. 12 is a graph showing the relationship between coil temperature and resistance value.

FIG. 13 is a perspective view showing a coil manufactured by the measuring method according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Measuring device 12 ... Winding jig 14 ... Insulating member 16 ... Temperature sensor 18a, 18b ... Compressed air nozzle 20 ... Adhesive nozzle 22 ... Electrode 24 ... Changeover switch 26 ... Power supply device 28 ... Resistance value measuring device 70 … Conductor 74… Coil

Claims (3)

[Claims] 1. A method for measuring a resistance value to a coil, the method comprising: applying an electric current to the coil to generate heat, melting an adhesive made of a thermoplastic resin for fixing the coil and permeating the coil. And a step of cooling the coil that has been heated by the energization, and a step of measuring a resistance value of the coil when the coil is cooled to a predetermined temperature, a method of measuring a resistance value of the coil. . 2. The method for measuring the resistance value of a coil according to claim 1, wherein the predetermined temperature is a temperature when the coil is in use. 3. A resistance value is measured for a coil whose shape is fixed by winding a conductive wire around a winding jig to form a coil, and supplying an adhesive made of a thermoplastic resin to the coil to solidify the coil. In the device, a power supply device for supplying a current to the coil to generate heat, a temperature measuring unit for measuring a temperature of the coil, and a resistance value measuring unit for measuring a resistance value of the coil, When the temperature detected by the measuring means is a predetermined temperature, the resistance value measuring means is energized to measure the resistance value of the coil at the predetermined temperature to judge the quality of the coil. Measuring device for resistance value of coil.