JP2021141011A - Insulation electric cable, coil, motor for vehicle and production method of insulation electric cable - Google Patents

Abstract

To provide an insulation electric cable which can be made thin, has high coupling property with a conductor, and uses an element wire having coating hard to peel away as a divided conductor.SOLUTION: An insulation electric cable 10 includes a conductive part 1 having a plurality of element wire parts 11, and an insulation layer 2 covering a periphery of the conductive part 1. Each of the element wire parts 11 comprises an element wire 11a, and a coating 11b formed on a periphery of the element wire 11a, the element wire 11a being formed of an electrically conductive body and the coating 11b being an organosilane film. The organosilane film contains a condensation product of a silane coupling agent. The conductive part (core part) 1 of the insulation electric cable 10 is divided by the element wire 11a, and on each element wire 11a and the organosilane film is formed as the coating 11b, so that thinning of the insulation electric cable is possible and a space factor of the insulation electric cable can be improved. In addition, such an organosilane film has high coupling property with the conductor and is hard to peel away, so that it can easily conform to extension or processing of the insulation electric cable 10 to maintain insulation property.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing an insulated electric wire, a coil, a vehicle motor, and an insulated electric wire.

As a component of a coil used in a vehicle motor, an insulated electric wire in which a wire made of a conductor is coated with an insulating layer made of enamel is used. In this insulated wire, a round wire to a flat wire (insulated wire having a substantially rectangular cross section) is used in order to increase the space factor.

Further, in recent years, motors for electric vehicles such as hybrid vehicles are often driven by high-frequency alternating current generated by an inverter as the current flowing through the motor is increasing in order to increase the output. ..

However, there is a problem that the eddy current loss increases due to the increase in the current, and the current flowing through the conductor is concentrated near the surface of the conductor wire due to the skin effect to increase the AC resistance.

Therefore, in order to suppress the eddy current loss and reduce the AC resistance due to the skin effect, an insulated wire using a split conductor structure has been studied.

For example, Patent Document 1 discloses an aggregate conductor formed by integrating a plurality of conductor strands coated with a resin.

Further, Patent Document 2 discloses an insulated electric wire in which an insulating layer is provided on an aggregate of a plurality of strands made of a conductor having a copper oxide film formed therein.

JP-A-2007-227265 JP-A-59-96605

The present inventor is considering adopting a split conductor as an insulated wire for a vehicle motor.

For example, when a film made of resin is used as the insulation between the strands as in Patent Document 1, the layer made of resin tends to be thick and the space factor is lowered. Further, when a copper oxide film is used as the insulation between the wires as in Patent Document 2, it can be formed thin, but it is difficult to be deformed according to the shape of the electric wire, and in particular, it is processed into a bent shape. If this is the case, peeling of the coating film is likely to occur.

Therefore, one object of the present invention is to provide an insulated wire using a wire having a coating film that can be thinned, has high bondability with a conductor, and is difficult to peel off as a split conductor.

The insulated wire according to one aspect of the present invention has a conductive portion having a plurality of strands and an insulating layer covering the outer periphery of the conductive portion, and the plurality of strands have the strands and the wires, respectively. It has a film formed on the outer periphery of the wire, the wire is made of a conductor, and the film is an organic silane film.

In the method for producing an insulated wire according to one aspect of the present invention, (a) a liquid containing a silane coupling agent is applied to a wire, and an organic silane film containing a condensate of the silane coupling agent is formed on the outer periphery of the wire. It includes a step of forming (b) a step of forming an insulating layer on the outer periphery of a conductive portion in which a plurality of strands on which the organic silane film is formed are bundled.

According to the insulated wire of the present invention, it is possible to provide an insulated wire using a wire having a coating film that can be thinned, has high bondability with a conductor, and is difficult to peel off as a split conductor.

Further, according to the method for manufacturing an insulated wire of the present invention, there is provided a method for manufacturing an insulated wire using a wire having a coating film that can be thinned, has high bondability with a conductor, and is difficult to peel off as a split conductor. be able to.

It is sectional drawing of the insulated wire which concerns on Embodiment 1. FIG. It is a figure which shows the general formula of the silane coupling agent, and the structure of a coating film. It is a figure (table) which shows the specific example of a silane coupling agent. It is a figure (table) which shows the specific example of a silane coupling agent. It is a figure which shows the general formula of the silane coupling agent which has a long chain spacer. It is sectional drawing of the insulated wire which concerns on application example 2. FIG. It is a cross-sectional view of the insulated wire of the comparative example. It is a graph which shows the result of the loss simulation in each structure. It is a figure which shows the manufacturing line of the insulated wire of Embodiment 2. It is a figure which shows the other production line of the insulated wire of Embodiment 2. It is a figure which shows the structure of the segment coil used for the vehicle motor of Embodiment 3. It is a figure which shows the structure of the stator (coil) of the vehicle motor of Embodiment 3.

(Embodiment 1)
FIG. 1 is a cross-sectional view of an insulated wire according to the present embodiment. The insulated wire 10 according to the present embodiment has a conductive portion 1 and an insulating layer 2 coated on the outer periphery of the conductive portion 1. The conductive portion (also referred to as a divided conductive portion or a core portion) 1 is composed of a plurality of strands 11. The wire portion 11 has a wire 11a and a coating film 11b that covers the wire. Here, two flat wire portions 11 are laminated in the thickness direction thereof.

The material of the wire 11a is not particularly limited as long as it is used for an insulated wire, but a conductive material (conductor) such as a metal material, specifically, for example, a copper wire or copper. Alloy wire can be used. Further, the surface of such a metal material may be plated with a metal such as nickel. Further, here, a flat wire having a substantially rectangular cross-sectional shape is used as the strand 11a, but a line having another shape, for example, a round wire or a wire having a different shape may be used. However, as described above, it is preferable to use a flat line in order to increase the space factor. The thickness of the strand 11a is, for example, about 1 mm to 2 mm in thickness and about 3 mm to 5 mm in width. In addition, in this specification, A to B indicate A or more and B or less in principle.

The material of the coating film 11b is an organic silane (organosilicon compound). That is, the film 11b is an organic silane film. Such a film (organic silane film, silane coat) can be formed by using a silane coupling agent. FIG. 2 is a diagram showing a general formula of a silane coupling agent and a structure of a coating film, and FIGS. 3 and 4 are diagrams (tables) showing specific examples of the silane coupling agent. As shown in FIG. 2 (A), the silane coupling agent contains a reactive group (-OR) that chemically reacts with an inorganic material (here, a wire 11a) and a functional group (-X, organic) that constitutes a main coating film. Group) and. That is, the silane coupling agent is a compound in which a reactive group (-OR) and a functional group (-X, organic group) are bonded to Si. For example, by allowing a silane coupling agent to act on the surface of a copper wire (wire 11a), an organic silane film (coating film) can be formed on the surface of the copper wire. In this case, the surface of the copper wire adsorbs water molecules in the air to form a hydroxyl group on the surface, and this hydroxyl group (-OH) reacts with the reactive group (-OR) of the silane coupling agent (-OR). Condensation (condensation, dehydration condensation) is carried out, and an organic silane film (film, −Si—X) is formed on the surface of the copper wire (FIG. 2 (B)). In other words, a condensate (-O-Si-X) of a silane coupling agent is formed on the surface of the copper wire. At the time of this condensation, the silane coupling molecules bonded to the surface of the copper wire may be condensed with each other, and the Sis may be connected via O (oxygen).

According to such an organic silane film, the thin film can be thinned, the space factor of the insulated wire can be improved, and the current density of the coil mounted in the slot can be increased. Further, such an organic silane film has high bondability with a conductor, has flexibility and flexibility, easily follows the elongation and processing of an insulated wire, and is used during the elongation and processing of an insulated wire. The peeling of the coating film can be suppressed, and the long-term reliability of the insulating characteristics of the insulated wire can be improved.

The film thickness of the organic silane film is, for example, about 0.1 μm to 10 μm. As a method of allowing the silane coupling agent to act, there is a method of applying a liquid containing the silane coupling agent. As the coating method, for example, a dip coating method or a spray coating method can be used.

As the silane coupling agent used for forming the organic silane film, for example, those shown in FIGS. 3 and 4 can be used.

Further, since the organic silane film is a thin film, the liquid containing the silane coupling agent (also referred to as an organic silane solution) used for its formation may have a low concentration. For example, a liquid containing 0.5% by weight to 5% by weight of a silane coupling agent can be used. Further, an ultra-thin film may be laminated to form a film by repeating application and drying of a liquid containing a silane coupling agent.

As the insulating layer 2, a polyimide-based, polyamide-imide-based, polyester-based, polyurethane-based, polyvinylformal-based, or polyphenylene sulfide (PPS) -based resin can be used. For example, the insulating layer 2 can be formed by coating the periphery of the conductive portion (core portion) 1 in which a plurality of strands 11 are bundled with the resin. For example, the insulating layer 2 can be formed by applying the resin material (precursor) around a core in which a plurality of strands 11 are bundled and then heating the resin material (precursor). Further, the insulating layer 2 can be formed by extruding the resin melted by an extruder or the like to the outer periphery of the conductive portion (core portion) 1. The film thickness of the insulating layer 2 is, for example, about 5 μm to 50 μm. As a coating method, a dip coating method, a spray coating method, or the like can be used.

(Application example 1)
Instead of the silane coupling agent shown in FIGS. 2 to 4, a silane coupling agent having a long chain spacer may be used. FIG. 5 is a diagram showing a general formula of a silane coupling agent having a long chain spacer. As shown in FIG. 5, the silane coupling agent having a long-chain spacer has a structure in which a reactive group (-OR) and a functional group (-X, an organic group) are bonded to Si, and Si and a functional group (-X). A long-chain spacer is incorporated between X and the organic group). The long chain spacer is, for example, −C _n H _2n −, n is 4 or more, more preferably 8 or more. The silane coupling agent having a long-chain spacer, e.g., FIG. 3, between the Si and the functional group of the silane coupling agent shown in FIG. 4 (-X, organic _{group), -C n H 2n -,} n Can be used in which 4 or more, more preferably 8 or more long chain spacers are bonded. Further, as the functional group (-X, organic group), one to which an epoxy group, a methacryl group, an amino group or the like is bonded can be used.

(Application example 2)
In the insulated wire shown in FIG. 1, a sleeve may be provided on the outer periphery of the conductive portion 1 and then covered with an insulating layer 2. FIG. 6 is a cross-sectional view of an insulated wire according to this application example. The insulated wire 10 according to this application example has a conductive portion 1, a sleeve 3 that covers the outer periphery of the conductive portion 1, and an insulating layer 2 that covers the outer periphery of the sleeve 3.

The conductive portion (also referred to as a divided conductive portion or a core portion) 1 is composed of a plurality of strands 11. The wire portion 11 has a wire 11a and a coating film 11b that covers the wire. Here, two flat wire portions 11 are laminated in the thickness direction thereof.

The materials, configurations, manufacturing methods, etc. of the strands 11a, the coating 11b, and the insulating layer 2 are as described above.

As the material of the sleeve 3, for example, a metal material such as copper or a copper alloy can be used. For example, a thin film (tape-like) metal material is wound around the outer circumference of a bundle of strands (conductive portion 1) by horizontal winding with 1/2 wrap, and wound in the extending direction of the bundle of strands (conductive portion 1). The sleeve 3 can be formed by spot welding at intervals of 1/2 of the pitch. In addition, a thin-film metal material is arranged (vertically attached) along the extending direction of the bundle of strands (conductive portion 1), wound, and then the butt portion of the end portion of the adjacent metal material is welded. May form the sleeve 3. Further, the sleeve 3 can be formed by extruding a metal material into a cylindrical shape on the outer circumference of a bundle of strands (conductive portion 1). The thickness of the sleeve 3 is, for example, about 0.1 mm to 0.2 mm. By providing such a sleeve 3, it is possible to prevent the wire from shifting, so that it is possible to improve the strength of the insulated wire against bending when processing the insulated wire into a substantially U-shaped segment coil. can.

(Application example 3)
The loss simulation of the insulated wire shown in FIGS. 1 and 6 will be described. Note that FIG. 7 is a cross-sectional view of the insulated wire of the comparative example. The insulated wire of this comparative example has a conductor (1) having a cross-sectional area about twice that of the above-mentioned strand, and an insulating layer (enamel paint) 2 on the outer periphery thereof. The loss was simulated by assuming a motor in which the insulated wire shown in FIG. 1 is structure 1, the insulated wire shown in FIG. 6 is structure 2, and the insulated wire shown in FIG. 7 is structure 3, and these are used as coils. FIG. 8 is a graph showing the results of loss simulation in each structure. As a combination of current (A), frequency (Hz) and rotation speed (rpm), condition A (150A, 266.6Hz, 4000rpm), condition B (240A, 266.6Hz, 4000rpm), condition C (40A, 1333. Loss was simulated for 3 Hz, 20000 rpm).

As shown in FIG. 8A, it was found that in the case of the condition A, the losses in the structure 1 and the structure 2 can be reduced by 15% and 11%, respectively, as compared with the case of the comparative example (structure 3). Further, as shown in FIG. 8B, it was found that in the case of the condition B, the losses in the structure 1 and the structure 2 can be reduced by 13% and 9%, respectively, as compared with the case of the comparative example (structure 3). .. Further, as shown in FIG. 8C, it was found that in the case of the condition C, the losses in the structure 1 and the structure 2 can be reduced by 53% and 38%, respectively, as compared with the case of the comparative example (structure 3). ..

(Application example 4)
In the insulated wire shown in FIG. 1 and the like, two flat square wires are laminated, but the number of laminated wires may be three or more. Further, the conductive portion (core portion) 1 may be formed by bundling the strands having a substantially rectangular cross section arranged in 2 rows and 2 columns. As described above, there are various combinations of the wires of the conductive portion (core portion) 1, but according to the study of the present inventor, in the configuration in which the flat wire is laminated, the loss is small and the characteristics are good. Met.

(Example A)
As the wire (11a), a copper flat wire of 1.9 × 3.45 mm and 20 cm was prepared, a silane coupling agent was applied, dried, and then heated (fired). As the silane coupling agent, 3-methacryloxypropyltriethoxysilane (KBE-503) manufactured by Shin-Etsu Chemical Co., Ltd. was used, which was diluted with a mixed solvent of water and alcohol to prepare a 1% by weight organic silane solution. Created.

After immersing the copper flat wire in the organic silane solution, it was dried. After repeating such a dipping and drying step 5 times, a heat treatment (110 ° C., 60 minutes) was performed to form an organic silane film on the outer periphery of the copper flat wire. This is referred to as sample A.

(Example B)
As the silane coupling agent for the long-chain spacer, a silane coupling agent for the long-chain spacer in which the -C ₃ H _6- portion of _{KBE-503 is -C 8} H _16- is used, as in the case of Example A. An organic silane solution was prepared in the above, and an organic silane film was formed on the outer periphery of the copper flat wire. This is referred to as sample B.

(Comparative Example 1)
As the strand (11a), a copper flat wire of 1.9 x 3.45 mm and 20 cm is prepared and heat-treated in air (450 ° C. for 30 minutes) to form a copper oxide film on the outer circumference of the copper flat wire. Formed. This is referred to as sample C1.

(Comparative Example 2)
As the strand (11a), a sample of 20 cm prepared by extruding and coating a PPS resin at 340 ° C. on a copper flat wire of 1.9 × 3.45 mm was prepared. This is referred to as sample C2.

(Other Examples)
As a silane coupling agent, 3-glycidoxypropyltrimethoxysilane (KBM-403), 3-methacryloxypropyltrimethoxysilane (KBM-503), 3-mercaptopropyltrimethoxysilane manufactured by Shin-Etsu Chemical Industry Co., Ltd. (KBM-803) was used respectively. Three kinds of organic silane solutions were prepared in the same manner as in Example A, and three different kinds of organic silane films were formed on the outer circumferences of the three copper flat wires.

(evaluation)
1. 1. Whether or not thinning is possible After polishing the cross section of each sample, SEM observation was performed to measure the film thickness of the outer periphery of the copper flat wire. When the film thickness was 10 μm or less, it was judged that the film could be thinned, and it was evaluated as “◯”.
2. Peeling resistance Each sample is stretched at 10 mm / min, and the state of the film on the outer circumference of the copper flat wire is judged with a microscope at elongations of 10%, 15%, 20%, 25%, and 30%, and the presence or absence of peeling is confirmed. bottom. Those in which peeling was confirmed at 10% elongation were marked with "x", those in which peeling was not confirmed at 10% elongation and peeling was confirmed at 15% were marked with "○", and the elongations were 20%, 25%, and 30%. Those in which no peeling was confirmed in any of them were marked with "◎".
3. 3. Scratch resistance (rubbing off)
# 60 sandpaper (3 mm × 3 mm) was placed on each sample, and 10 reciprocations of 5 cm were performed while applying a load of 10 gf, and the state of the film on the outer periphery of the copper flat wire was visually judged. Those without peeling are marked with "◎", those with some streaky scratches but do not affect the insulation are marked with "○", and those with a size that affects the insulation are marked with "○". × ”.

The results are shown in Table 1.

As shown in Table 1, in the case of Comparative Example 1 (copper oxide film), a thin film can be formed and a film having a film thickness of about 5 μm can be formed, but peeling due to elongation occurs and scratch resistance occurs. The sex was also bad. Therefore, when such an oxide film is applied to the outer circumference of the wire for insulation between the wires, the oxide film is peeled off during processing of the insulated wire, and the insulation between the wires is ensured. However, the loss due to eddy current etc. becomes large.

Further, in the case of Comparative Example 2 (resin film), peeling due to elongation did not occur and the scratch resistance was good, but it was difficult to thin the film. The film thickness in this case was 50 μm to 100 μm. When such a thick film is applied to the outer periphery of the strands for insulation between the strands, the space factor decreases.

On the other hand, in Example A (Sample A), a thin film could be formed and a film having a film thickness of about 5 μm could be formed. In addition, peeling due to elongation of about 10% did not occur, and scratch resistance was also good. Here, the silane coupling agent shown in FIGS. 3 and 4 is referred to as a "normal product (normal type)". In this case, for example, the carbon chain of the spacer is 3 or less ( _{n of} "C n H _2n " is 3 or less).
Further, in Example B (Sample B) using the silane coupling agent of the long chain spacer, it was possible to make a thin film, and it was possible to form a film having a film thickness of about 5 μm. Further, peeling did not occur even when the elongation was 20% or more, and the scratch resistance was also very good.

In addition, as a silane coupling agent, 3-glycidoxypropyltrimethoxysilane (KBM-403), 3-methacryloxypropyltrimethoxysilane (KBM-503), 3-mercaptopropyl manufactured by Shin-Etsu Chemical Co., Ltd. Using trimethoxysilane (KBM-803), the organic silane solution was prepared in the same manner as in Example A, and the three samples in which an organic silane film was formed on the outer circumference of the copper flat wire were also equivalent to sample A. Good results were obtained.

As described above, according to the present embodiment, as confirmed in the above embodiment, the conductive portion (core portion) 1 of the insulated wire is divided by the strands, and an organic silane film is formed on each strand as a coating film. Therefore, the thin film can be thinned, and the space factor of the insulated wire can be improved. In addition, such an organic silane film has high bondability with a conductor, is difficult to peel off, easily follows the elongation and processing of an insulated wire, and can maintain the insulating property. As described above, according to the present embodiment, the characteristics of the insulated wire can be improved. Further, the concentration of the silane coupling agent in the organic silane solution can be lowered, and a film can be formed at low cost.

(Embodiment 2)
In the present embodiment, a production line for an insulated electric wire will be described. FIG. 9 is a diagram showing a production line for the insulated electric wire of the present embodiment.

As shown in FIG. 9A, the wire 11a sent out from the transmitter 30 is immersed in the organic silane solution in the processing tank 40 and dried to form a coating film 11b, which is then wound around the winder 50. take. The wire 11a to which the coating liquid drawn from the treatment tank 40 is attached may be passed through a drying / heating furnace (not shown) and then wound on a winding machine 50. Further, the wire 11a to which the coating liquid is attached may be passed through a drying oven (not shown) and then immersed in the organic silane solution again by the route of the broken line to thicken the coating film. Moreover, you may heat (fire) the laminated dry film at a time.

The organic silane solution is a mixed solution of a silane coupling agent and a solvent, and the concentration of the silane coupling agent is about 0.5% by weight to 5% by weight. The drying temperature is about 80 ° C. to 150 ° C., and the drying time is about 1 minute to 5 minutes. The heating (firing) temperature is about 120 ° C. to 180 ° C., and the heating (firing) time is about 2 minutes to 5 minutes. When laminating the coating film, the number of times of immersion in the organic silane solution (number of times of application) is about 5 to 10 times.

Next, as shown in FIG. 9B, the wire 11b (wire portion 11) on which the coating film 11b is formed is sent out from the transmitters 32a and 32b, respectively, and in a laminated state, the resin material (the resin material) is used by the coater 42a. After applying the precursor), the insulating layer 2 is formed by passing it through a heating furnace 42b. Reference numeral 42c is a mouthpiece for removing excess coating liquid. Further, the resin material (precursor) may be applied again by the route of the broken line to thicken the insulating layer 2. Moreover, you may heat (fire) the laminated dry resin material at a time. The heating (firing) temperature is about 300 ° C. to 500 ° C., and the heating (firing) time is about 3 minutes to 30 minutes.

FIG. 10 is a diagram showing another production line of the insulated wire of the present embodiment. The production line for the insulated wire having the sleeve 3 described with reference to FIG. 6 will be described with reference to FIG.

As shown in FIG. 10A, the wire 11a sent out from the transmitter 30 is immersed in the organic silane solution in the processing tank 40 and dried to form a coating film 11b, which is then wound around the winder 50. take. The wire 11a to which the coating liquid drawn from the treatment tank 40 is attached may be passed through a drying / heating furnace (not shown) and then wound on a winding machine 50. Further, the wire 11a to which the coating liquid is attached may be passed through a drying oven (not shown) and then immersed in the organic silane solution again by the route of the broken line to thicken the coating film. Moreover, you may heat (fire) the laminated dry film at a time.

As described above, the organic silane solution is a mixed solution of a silane coupling agent and a solvent, and the concentration of the silane coupling agent, drying conditions, heating (baking) conditions, and the number of immersions (number of coatings) are shown in FIG. 9 (A). ) Is the same.

Next, as shown in FIG. 10B, the wire 11a (wire portion 11) on which the coating film 11b is formed is sent out from the transmitters 31a and 31b, respectively, and in a laminated state, passed through the sleeve forming machine 41a. After coating the laminate with a metal material to form the sleeve 3, the sleeve-coated laminate having a desired cross section is formed by passing it through a stretching machine 41b.

Next, as shown in FIG. 10C, the sleeve-coated laminate is sent out from the transmitter 32, the resin material (precursor) is applied by the coater 42a, and then the sleeve-coated laminate is passed through the heating furnace 42b. The insulating layer 2 is formed on the outer periphery of the. Reference numeral 42c is a mouthpiece for removing excess coating liquid. Further, the resin material (precursor) may be applied again by the route of the broken line to thicken the insulating layer 2. Moreover, you may heat (fire) the laminated dry resin material at a time. The heating (firing) conditions are the same as in the case of FIG. 9B.

Here, the thickness (cross section) of the wire (here, the sleeve-coated laminate) can be adjusted by the stretching treatment using the stretching machine or the like. However, in the stretching treatment after the coating 11b is formed, it is preferable to adjust the elongation of the line to be treated in the range of less than 20%, more preferably less than 10%. In the step of FIG. 9 described above, the stretching treatment after the formation of the coating film 11b may be performed, but in this case as well, the elongation of the line to be treated is adjusted within the range of less than 20%, more preferably less than 10%. It is preferable to do so.

(Embodiment 3)
In the present embodiment, application examples of the insulated electric wires described in the first and second embodiments will be described. The application example of the insulated wire described in the first and second embodiments is not limited, but can be applied to the coil of the vehicle motor shown below. That is, the insulated wire described in the first and second embodiments can be used as the insulated wire for the coil of the vehicle motor.

FIG. 11 is a diagram showing a configuration of a segment coil used in the vehicle motor of the present embodiment, and FIG. 12 is a diagram showing a configuration of a stator (coil) of the vehicle motor of the present embodiment.

As shown in FIG. 11A, the insulated wire 10 described in the first embodiment has a conductive portion 1 and an insulating layer 2 coated on the outer periphery of the conductive portion 1. The conductive portion (also referred to as a divided conductive portion or a core portion) 1 is composed of a plurality of strands 11. The strand portion 11 has a strand 11a and a coating film 11b made of an organic silane film that covers the strands.

Then, the insulated wire 10 is cut to a predetermined length and processed into a substantially U-shaped segment coil (divided insulated wire 10) shown in FIG. 11 (B). This segment coil has a curved portion and two ends. A coil is formed by connecting a plurality of such segment coils.

For example, segment coils are mounted in the plurality of slots of the stator 20 shown in FIG. For example, as shown in FIG. 12, the segment coil is inserted into the slot of the stator so that the curved portion is on the upper side. Then, by welding the end portion (not shown) of each segment coil protruding from the lower end of the stator so as to connect with the adjacent segment coil, the coil is formed along the outer periphery of the cylindrical stator.

A motor having such a stator is used as a motor for driving an electric vehicle (xEV) such as a hybrid vehicle or an electric vehicle.

Such a motor has a cylindrical stator, a coil attached to the stator as described above, and a rotor rotatably arranged at a distance from the inner peripheral wall of the stator. .. Then, a driving force can be obtained by rotating the rotor based on the magnetic field generated in the coil.

As described above, the motor of such an electric vehicle is often driven by high-frequency alternating current, and loss due to eddy current or the like is likely to occur. Therefore, the insulated wire described in detail in the first embodiment or the like is used. Is suitable.

Although the vehicle motor has been described here as an example, the insulated wire described in the first embodiment and the like can be applied to other motors.

The structures and sizes of the insulated wires, coils, and vehicle motors described in the above embodiments and examples are examples, and are not limited to the above.

As described above, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made without departing from the gist thereof.

1 Conductive part (core part)
2 Insulation layer 3 Sleeve 10 Insulated wire 11 Wire part 11a Wire 11b Coating 20 Stator 30 Sender 31a Sender 31b Sender 32 Sender 32a Sender 32b Sender 40 Processing tank 41a Sleeve forming machine 41b Stretcher 42a Coater 42b Heating furnace 42c Mouthpiece 50 Winding machine 51 Winding machine 52 Winding machine

Claims (7)

Conductive parts with multiple strands and
It has an insulating layer that covers the outer periphery of the conductive portion.
Each of the plurality of strands has a strand and a coating formed on the outer periphery of the strand.
The wire is made of a conductor and is made of a conductor.
The coating film is an insulated electric wire which is an organic silane film. In the insulated wire according to claim 1,
The organic silane film is an insulated wire containing a condensate of a silane coupling agent. In the insulated wire according to claim 1,
An insulated wire that is located between the conductive portion and the insulating layer and has a sleeve that covers the outer periphery of the conductive portion. A coil having an insulated wire according to any one of claims 1 to 3. A vehicle motor having the coil according to claim 4. (A) A step of applying a liquid containing a silane coupling agent to a wire and forming an organic silane film containing a condensate of the silane coupling agent on the outer periphery of the wire.
(B) A method for manufacturing an insulated electric wire, comprising a step of forming an insulating layer on the outer periphery of a conductive portion in which a plurality of strands on which the organic silane film is formed are bundled. In the method for manufacturing an insulated wire according to claim 6,
Between the step (a) and the step (b)
(C) The step of forming a sleeve on the outer periphery of a conductive portion in which a plurality of strands on which the organic silane film is formed is bundled is provided.
The step (b) is a step of forming the insulating layer on the outer periphery of the sleeve, which is a method of manufacturing an insulated electric wire.

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