JPS6139407A - Self-adhesive insulated wire and sealed compressor motor using same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a self-adhesive insulated wire J3 having particularly excellent Freon resistance and an electric motor 1 for a hermetic compressor (hereinafter referred to as a "hermetic motor") using the same. It is something.

[Prior art and its problems]

BACKGROUND ART In recent years, technological advances have been remarkable as demand for various types of refrigeration equipment, including air conditioners and refrigerators, has increased significantly and their applications have expanded. The hermetic motors used in these refrigerators are operated under severe load fluctuations in an environment where refrigerant such as Freon and refrigerator oil coexist.

On the other hand, with the advancement of technology, the demand for equipment to be smaller and lighter, to have higher performance and higher reliability is becoming higher and higher. As mentioned above, a hermetic motor is built into a compressor and operates in the coexistence of refrigerant and refrigeration oil, so the organic insulating materials used in the motor, such as magnet wires, are not attacked by these refrigerants and refrigeration oil and deteriorate. An important requirement is not to do so. In particular, the refrigerant Freon, such as R-22, is chemically stable in itself and has extremely strong dissolving power as a solvent.Moreover, the motor is subject to large load fluctuations, and as a result, once the pressure is Because rapid changes are constantly repeated, materials that can withstand these external factors and can be used stably over long periods of time are needed.

Therefore, in order to obtain a highly reliable hermetic motor, the magnet wire used therein must have the following characteristics in addition to the characteristics required for a general-purpose motor.

(1) It is difficult to extract, soften, swell, or absorb refrigerant under conditions where the refrigerant is weak.

(2) Maintain sufficient dielectric strength and high insulation resistance of 11N in an environment where refrigerant and frozen oil coexist.

(3) Must have blister resistance and overload resistance.

(4) It has heat resistance that can withstand temperature increases caused by short-term restricted operation.

(5) It must have a strong insulating film that does not deform due to electromagnetic vibration, mechanical vibration, etc. in the refrigerant.

Such properties are particularly important for providing high reliability to the insulation system of hermetic motors.

Furthermore, in order to provide a hermetic motor with even higher reliability, it is necessary to suppress magnetostrictive vibration of the magnet wire. For this reason, magnet wires have conventionally been fixed with epoxy resin-based impregnated varnish. However, this method has the disadvantage that the impregnated varnish adheres to the entire stator of the motor, resulting in an unbalanced clearance between the stator and rotor and uneven adhesion of the wires.

Therefore, attempts have been made to use self-adhesive insulated wires in order to solve these drawbacks, improve the working environment during the varnish impregnation process, and streamline the impregnation process.

However, although self-adhesive insulated wires are generally used in small transformers and some general-purpose rotating machines, they have only been used in stationary equipment such as transformers as oil-immersed equipment. This is because when conventional self-adhesive insulated wires are used in hermetic motors, the adhesive layer of the self-adhesive insulated wires is attacked by a refrigerant such as Freon, which has strong dissolving power, and some of the resin in the adhesive layer is stained by Freon. This melted material adheres to the pipes and kits from the compressor to the condenser and evaporator, eventually causing clogging, or adhering to the piston, rotor, or cylinder of the compressor and causing burnout. This is because they have drawbacks such as sticking and wear.

[Experiment] Therefore, the present inventors conducted a detailed study on the characteristics required of the adhesive layer of a self-adhesive insulated wire that can be suitably used in a Hermedec motor.

(Consideration work) Conventional self-adhesive insulated wires that simply use thermoplastic resins such as polyvinyl butyral resin, polyamide resin, polyester resin, polysulfone resin, polyethernalphone resin, epoxy resin, and phenoxy resin for the adhesive layer are as follows:
The temperature dependence of the adhesion force after each coil molding is large. The adhesion force is particularly weak at high temperatures (over 100°C), and if electromagnetic vibration or mechanical vibration is applied to the coil at 8 degrees, as in the case of B and F class general-purpose rotary u1, the formed coil will break into pieces. Sometimes. Particularly when applied to hermetic motors, since Freon and the like with strong dissolving power are present, the adhesive layer may swell, soften, be extracted, and be dissolved. After all, the connection of self-adhesive insulated wires used in hermetic motors
The layer needs to have sufficient resistance to the coil hardening force at high temperatures, electromagnetic imaging force, and mechanical vibration force, and must not swell or dissolve in the coolant at high temperatures. Therefore, the adhesive layer needs to have a chemically crosslinked three-dimensional structure.

(Study ■) By the way, the adhesive layer of self-adhesive insulated wires already used in oil-immersed transformers has a cross-linked three-dimensional structure, and its resin composition is, for example, 80 parts by weight of phenoxy resin and epoxy resin. Generally, it consists of 20 mold parts and 30 parts by weight of melamine resin. Therefore, we investigated the stability of a self-adhesive insulated wire having an adhesive layer of this composition in Freon by comparing it with a conventional insulated wire treated with an epoxy-based impregnated varnish.

First, it was immersed in Freon (R-22) at 80°C for over 100 days, and the extraction rate was examined. As a result, a frame of the above composition, I
The n-type adhesive layer has more extraction valves than epoxy-based impregnated varnish, and the amount is about 0.8% after 50 days of immersion, making it unsuitable for use as a self-adhesive insulated wire for hermetic motors.

On the other hand, although the epoxy resin of epoxy-based impregnated varnish generally has excellent chemical resistance and has fewer extraction ports than the above-mentioned self-adhesive insulated wire, it is still not satisfactory for use in hermetic motors.

When the extract obtained in the above extraction test was analyzed, it was found to be a polymer with a small molecular weight.

Therefore, as the base polymer for the adhesive layer of the self-adhesive insulation for Hermedec motors, it is important to select a polymer with a high m@ degree that is difficult to swell, extract, and dissolve in Freon.

On the other hand, in the manufacturing process of epoxy resin, HCf is produced as a by-product, so this l-1cf is neutralized with Fb2COx, etc., and N
It is removed as i+Cj. However, minute N
aCj inevitably remains in the resin. If such an electrolyte is contained in the resin, albeit in a small amount, the electrolyte will be eluted into the refrigerant from the adhesive layer formed using the electrolyte, causing corrosion of copper piping, etc. Also,
Cu ions generated by corrosion are chemically plated on the motor rotor shaft, etc., and reduce the operating efficiency of the motor. Therefore, the resin that forms the adhesive layer contains Nacf. It is also necessary to avoid containing such electrolytes as much as possible.

Furthermore, when the extract extracted in the above extraction test was analyzed, it was found to be a polymer with a small molecule.

Therefore, as a base polymer for the adhesive layer of self-adhesive insulated wire for hermetic motors, swellable, extracted, and
It is important to select a polymer with a high degree of polymerization that is difficult to dissolve.

(Study ■) - Blister cycle test and adhesion test in Freon - During operation, a hermetic motor is repeatedly subjected to pressure changes under the thermal history of the refrigerant. 1. Therefore, the blister cycle test, which is thought to facilitate this situation, is important as a means of evaluating the refrigerant resistance of self-adhesive insulated wires. Therefore, the dielectric breakdown voltage after the blister cycle was measured for the above-mentioned conventional crosslinked self-adhesive insulated wire and the epoxy-impregnated varnish-treated insulated wire. As a result, the conventional cross-linked self-adhesive insulated wire still has a higher W after blister cycle than the epoxy-based impregnated varnish-treated insulated wire. It was found that the edge breakdown voltage was inferior.

Another important requirement for a self-adhesive insulated wire for a Hermeboot motor is that it has adhesive strength sufficient to withstand magnetostrictive imaging in high-temperature Freon. For this purpose, we immersed the wound coil in Freon (R-22) with a weight attached, changed the iS2 degree of Freon, determined the load at which the coil would split, and measured the adhesive strength in Freon. did. This result also shows that conventional cross-linked self-adhesive insulated wires have considerably lower adhesive strength than insulated wires treated with epoxy-based impregnated varnish.

(Inspection N'f IV.

To reduce Freon extraction of the adhesive layer, af
In addition to using a polymer of f degree, its crosslinking density also plays an important role.

Therefore, when we determined the crosslink density of the conventional cross-linked self-adhesive insulated wire and the epoxy-impregnated varnish-treated insulated wire using the gel fraction in chloroform (80°C, 24 hours), we found that the conventional cross-linked self-adhesive insulated wire It was 90% for electric wires and 95% for insulated wires treated with epoxy impregnated varnish.

From this, it can be seen that for a self-adhesive insulated wire for a hermetic motor, it is necessary to increase the crosslinking density to at least about 95% of that of the epoxy-based impregnated varnish treatment.

In addition to increasing the crosslinking density, an increase in the crosslinking speed is also an important requirement. In other words, the current manufacturing process for hermetic motors is mainly a so-called batch process, but in the future, automatic assembly conveyor lines, etc. will naturally be introduced! A significant improvement in manufacturing speed is expected. Therefore, it is expected that a reduction in the crosslinking time of the adhesive layer of the self-adhesive insulated wire will be required. Therefore, the contact layer needs to be cross-linked to AlJi in the dark for a short time, but conventional cross-linked self-adhesive insulated wires do not reach this required level.

Thus, it has been found that in order to put self-adhesive insulated wires into practical use as winding wires for Hermedec motors, the various requirements mentioned above must be satisfied.

[Objectives and Structure of the Invention] The present invention has been made based on the above findings, and the present invention is based on the above findings, and is based on the fact that when immersed in cold noodles such as fried noodles or refrigerator oil at high temperature for a long period of time, the adhesive layer is attacked by the refrigerant, etc. A self-adhesive insulated wire suitable for a hermetic motor, which does not cause any inconvenience as a refrigerator, such as smearing or melting, and a hermetic motor obtained by winding this self-adhesive insulated wire as a stator coil. It is intended to provide a sodium chloride content of 5 pl).
1 or less, 100 parts by weight of a phenoxy resin and/or epoxy resin having an ultimate clay of 0.440 or more as determined using tetrahydrofuran as a solvent and 25°C, and 20 to 100 parts by weight of a lobetylated melamine resin, added as necessary. Phenol of 1,8-diaza-bicyclo[5,4,0]undecene-7 as a crosslinking density improver 10.1~
A Freon-resistant self-adhesive insulated wire is provided on a conductor via an insulating layer using a mixture consisting of 5 parts by weight as an adhesive layer, and this self-adhesive #8 edge wire is wound around a stator coil. This is a Hermedec motor.

The base polymer of the mixture constituting the adhesive layer of this self-adhesive insulated wire is phenoxy (H resin) or epoxy resin obtained by condensing epichlorohydrin and bisphenol A, and mixtures thereof.

These phenoxy resins and epoxy resins are
Both are interval C! Used is one in which the m content is 5 ppn+ or less and the intrinsic viscosity determined from the specific viscosity measured at a measurement temperature of 25° C. using tetrahydrofuran as a solvent is 0.440 or more.

As mentioned earlier, the reason why the NaCl content was set to 5 ppn+ or less was to prevent problems such as NaCl in the adhesive layer leaching into the refrigerant and corroding copper piping. The upper limit was set at 5 ppm.

The NaCl content in these resins can be reduced to 5 ppn+ or less by purifying the resins using a hot water washing method using ultrasonic waves or the like.

As is well known, the intrinsic viscosity t, 5 represents the viscosity average molecule M of a polymer, so when measured under the same conditions, the larger the value, the higher the molecular weight, and the smaller the value, the lower the molecular weight. Therefore, since it is known that a resin with a high molecular weight m is required to improve the Freon resistance as described above, a resin with a large intrinsic viscosity is desirable. The inventors
Regarding various phenoxy resins Jj and epoxy resins,
We determined the intrinsic viscosity at 25°C in Tetrahyde Nichinolan and examined the freon resistance of these resins, and found that sufficient freon resistance could be obtained if the intrinsic viscosity under the above measurement conditions was 0.440 or higher. I learned.

Furthermore, in order to further improve Freon resistance, it is also desirable to measure the molecular weight distribution of the phenolic resin and epoxy resin by gel permeation chromatography or the like, and select a resin with a low low molecular weight M content. FIG. 1 shows the molecular Φ distributions of two types of phenoxy resins measured by gel permeation chromatography, and the phenoxy resins shown by ■ in FIG. 1 are preferred. In the case of phenoxy resin (2), it may be treated with a mixed solvent of methyl ethyl ketone, a good solvent, and toluene, a poor solvent, to selectively remove the lower molecular weight portions.

By mixing epoxy resin with phenoxy resin,
Phenoxy resin itself has excellent chemical resistance, adhesion, and 1♀ resistance.
In addition to the depletion properties, the number of reactive groups involved in the crosslinking reaction increases,
In addition, the epoxy group in the epoxy resin supplements the 1-1 cf generated by the reaction between Freon and refrigerating machine oil, which contributes to improving the crosslinking density and crosslinking speed, and prevents corrosion of metal parts such as motors and compressors. It has the effect of preventing When using a mixture of phenoxy resin and epoxy resin, the mixing ratio is 70 to 90% of phenoxy resin.
wt%, and the epoxy resin is about 30 to 10 wt%.

In addition, the n-butylated melamine resin used as a crosslinking agent for the resin described in IyI has an amino group in its molecule, and when inserted into the base polymer phenoxy resin and epoxy resin, the n-butylated melamine resin has a good crosslinking reaction. It also has the effect of preventing corrosion by similarly supplementing I-I CI produced by the reaction between the oil and the refrigerating machine oil.

The n-butylated melamine resin is added in an amount of 20 to 100 parts by weight based on 100 parts by weight of the base polymer. If the amount of m added is less than 20 parts by weight, the base polymer cannot be sufficiently crosslinked, and the desired properties such as adhesive strength at high temperatures cannot be obtained, and if it exceeds 100 parts by weight, crosslinking reaction occurs. If the adhesive varnish progresses too much, the adhesive layer after curing becomes brittle and its mechanical strength decreases, and there is a risk that a crosslinking reaction will proceed during the coating and baking process as an adhesive varnish.

Furthermore, in order to further improve the crosslinking density of the tp'i adhesive layer, 1,8-diaza-bicyclo[
5,4,O] The phenol salt of Lourensen-7 is added. This compound functions as a crosslinking density improver, and during the crosslinking reaction between the base polymer and n-butylated melamine B4 fat, it promotes the crosslinking reaction by promoting polarization of the reactive groups of both, and This is done so as not to leave any unreacted reactive groups.The amount of addition of this compound is in the range of 0.1 to 5 parts by weight per 100 parts by weight of the base polymer, and 0.1 parts by weight. If it is less than 1 part of 5 mff, the pot life (pot life) when used as an adhesive varnish or an adhesive layer of a self-adhesive insulated wire will be shortened.
This causes practical inconvenience.

Then, the mixture consisting of the base polymer, n-butylated melamine resin, and crosslinking density improver is dissolved in a solvent such as cyclohexanone or cellosolove, and the solid content is 10.
~2wt% adhesive varnish, and it does not apply to conductors.
It is applied and baked through 1 sheet to form adhesive H. The above-mentioned insulating layer is not particularly limited, but considering the heat resistance and chemical resistance of the resulting self-adhesive insulated wire as a whole, polyesterimide paint, polyamideimide paint, polyesteramideimide paint, polyester paint t [Which insulating paint is applied and baked to form an insulating layer is preferable, but since the motor windings must be wound around the stator core while the adhesive layer is semi-hardened, it is generally not possible to use an adhesive layer. Compared to insulated wires, motor IJN performance is generally worse. This is because the coating hardness of the adhesive layer is softer than that of conventional insulated wires, so the outermost adhesive layer is easily damaged by jigs and tools when inserting motor windings and forming end coils.

However, by using polyamide-imide for the insulating layer in contact with the adhesive layer, it is possible to have a significant difference in the mechanical strength of the film between the adhesive layer and the adhesive layer. By sacrificing the adhesive layer with mechanical pressure and friction sawing, it becomes possible to protect the insulating layer.

For example, when polyester imide, polyester, etc. are used for the insulating layer, it is difficult to prevent mechanical processing deterioration (jergic scratches) that is applied to the adhesive layer during motor manufacturing using the adhesive layer alone. The aggravating factor is that: L affects the insulating layer.

However, using polyamide-imide as a combination of the insulating layer in contact with the adhesive layer is optimal from the standpoint of maintaining the heat resistance of the contact layer after the adhesive layer has hardened, and is primarily used to prevent damage during motor manufacturing. It has a remarkable effect. and,
It is desirable that the thickness of the polyamide-imide film in the insulating layer in contact with the contact M layer is 5 μm or more, and in order to reduce the material cost of the insulating layer, a polyester material is used as the insulating layer below the polyamide-imide layer. and the insulating layer to 21
A single structure is extremely practical.

The above adhesive varnish is applied and baked using general enamel Ta1.
! It can be carried out using a J manufacturing equipment, and the concentration in the baking furnace is set at 250℃.
Set it to a certain level. The finished thickness of the adhesive layer is 5 to 50
It is selected as appropriate depending on the application within a range of approximately 15 μm, but when used for a hermetic motor, it is usually approximately 15 μm. .

The Freon-resistant self-adhesive insulated wire of the present invention obtained as described above is also wound around a stator coil to form a hermetic motor of the present invention. This is generally done on a laminated core made of silicon steel plate; two self-adhesive insulated wires are wound to form a main coil and an auxiliary coil, followed by interphase insulation, coil molding, lead wire connection, coil binding, molding, surge stabilization, and annealing. After passing through each process, for example, the coil is sent to a curing furnace, and the coil is heated together with the core to thermally crosslink the adhesive layer. Heating conditions are 120-25
It is said that it is about 5 minutes to 30 hours at 0°C.

In this way, the adhesive layer of the self-adhesive insulated wire wound into a coil is once melted, and the spaces between each wire are filled with molten resin, making the wire continuous. Then, a crosslinking reaction begins, and the adhesive layer hardens.
The wires are bonded to each other by a hardened adhesive layer to form an integrated stator coil. The stator thus obtained is combined with a separately manufactured rotor to form the intended hermetic motor, which is then incorporated into a compressor.

The stator coil of the hermetic motor obtained in this way has a specific phenoxy resin and/or epoxy resin and n-butylated melamine resin added to the adhesive layer of the self-adhesive insulated wire forming the coil, and further contains, if necessary, 1°8-diaza-bicyclo[5,4,O
] Since the adhesive layer is cross-linked and cured with a cross-linking agent consisting of a phenol salt of Launssen-7, the adhesive layer becomes a state in which the high-molecular weight base polymer is cross-linked with a high cross-link density.
It does not swell or dissolve in the refrigerant Freon, etc., and has extremely high Freon resistance.

Therefore, the Hermedec motor with this stator coil also has excellent resistance to freon, and can operate stably for a long period of time in the presence of freon, while also preventing various problems from occurring in the compressor, piping system, capillary, etc. inside the refrigerator. Nor.

[Example] Hereinafter, the effects of the present invention will be specifically explained with reference to Examples.

Example 1 First, resin compositions constituting the adhesive layer shown in the formulation examples in Table 1 are prepared, and these compositions are dissolved in cyclohexanone to prepare an adhesive varnish having a solid content of 17 wt%.

In Table 1, the phenoxy resin (I) has a -02 compound of 500 ppm and an intrinsic viscosity (25°C, tetrahydrofuran) of 0.332, and the phenoxy resin (If) has a lI&
1 cI content 31) l) 11, intrinsic viscosity (25°C, tetrahydrofuran > 0.450, epoxy resin (1
) has a Naci content of 5QQppl and an intrinsic viscosity (25℃,
Tetrahydrofuran) is 0.332, and epoxy resin (II) has a NaCl content of 31) Ellll intrinsic viscosity (
25°C, tetrahydrofuran) 0.450. In addition, n-butylated melamine resin is Kneepan 208
E (manufactured by Mitsui Toatsu Chemical Co., Ltd.), and the phenol salt of 1,8-diaza-bicyclo[5,4,0]undecene-7 as a crosslinking density improver is (No CAT, 5AN6).
．． ．． 1 (manufactured by Sanabot 1-Co., Ltd.) was used.

Then i! 1.0+n+n annealed copper wire coated with polyesterimide 1 and baked to form a primary insulation layer with a thickness of 40 μm, and a polyamide-imide paint coated and baked to form a 10 μm thick secondary insulation layer. 1. To the insulated wire installed. A self-adhesive insulated wire was manufactured by applying the adhesive varnish described above and introducing it into a baking furnace set at a temperature of 250°C and baking it to form an adhesive layer with a thickness of 15 μm. Adhesive f1 insulated wire at 180℃ 0.5
The adhesive layer was cured by heating for a period of time and used as a sample for the next test.

Freon resistance of these samples was examined using the test items shown in Table 2. The results are shown in Table 2. Table 2 shows a conventional example in which epoxy-based impregnated varnish (Bear Gree-923
The results are also shown for samples prepared by coating and baking a coating material (manufactured by B.D. George).

As is clear from Table 2, the adhesive layer of the self-adhesive insulated wire of the present invention has the same amount of n-butylated melamine resin as well as the conventional self-adhesive insulated wire (comparative formulations 1 to 4). is a self-adhesive insulated wire outside the scope of the present invention (comparative formulation 5).
~10) It can be seen that the freon resistance is significantly improved compared to the conventional epoxy-impregnated varnish-treated insulated wire that has a proven track record in hermetic motors. Furthermore, the present invention compounded products No. 1 to 15 and comparative compounded product N in Table 1.

5 to 10, polyesterimide insulation F4 (20μ) and polyimide amide insulation layer (
A self-adhesive insulated wire was prepared by sequentially applying and baking 10 μm of adhesive to form a 10 μm thick adhesive layer on the baked film.

Next, we investigated the flexibility of this self-adhesive insulated wire. The results are shown in Table 3.

The evaluation of flexibility was expressed by the number of cracks in three samples.

As is clear from Table 3, 20 to 100 parts by weight, especially 20 to 100 parts by weight of n-butylated melamine resin is added to 100 parts by weight of phenoxy resin (IF) or epoxy resin (II).
It can be seen that the contact Mr made of the composition containing 60 parts by weight has excellent flexibility. Therefore, the amount of 11-butylated melamine resin added is the same as that of phenoxy resin (II) and/or
or 2 parts per 100 parts fM of epoxy resin (II)
It can be seen that a range of 0 to 100 mff 1 part is good.

Example 2 Self-adhesive insulated wires (hereinafter referred to as invention wires 2 and 8) having adhesive layers having the compositions of Invention Formulation Examples 2 and 8 in Table 1 and epoxy-based impregnated varnish-treated insulated wires ( ) and the conventional self-adhesive insulated wire (hereinafter referred to as conventional wire) shown in Comparative Mixing Example 3 in Table 1. Extraction characteristics according to R-22) ■Electrical strength after 2-17 Lister cycle test 2-21 Adhesion strength after Lister cycle ■Adhesion strength in R-22 was compared.

First, FIG. 2 shows the results of the extraction characteristics of R-22 at high temperature (80° C.). The electric wire 2.8 of the present invention has R- even at high temperatures.
22 is difficult to extract. This is considered to be due to the specific molecular weight of the base polymer and the effect of the n-butylated melamine resin.

The blister cycle test is a test that reproduces and promotes the situation in which a hermetic motor undergoes repeated pressure changes due to the thermal history of the refrigerant during operation, and is an important judgment item when planning the refrigerant resistance of insulated wires. becomes. Here, one cycle consists of refrigerant immersion at 90°C x 72 hours, heating at 150°C x 10
It was set as 1 minute. The refrigerant is R-22. Then, the residual rate (%) of dielectric breakdown voltage after blister cycle and adhesive strength (k
a) was measured. Adhesive force measurement is performed using NEMA MW
-- According to 1000. The results are shown in FIGS. 3 and 4.

Judging the contact force in a refrigerant is a criterion for determining whether or not it can withstand magnetostrictive vibration when used as a hermetic motor, and the coil is made by tightly winding the sample wire and heat-treating it. refrigerant R-2, and give a review on it.
The whole was immersed in a container filled with R-22, and the temperature of R-22 was gradually raised to determine the temperature and load at which the coil splits. The results are shown in FIG. 5 as the 1 μm, 1 degree dependence of the adhesive force.

As is clear from the graphs in Figures 2 to 5, it can be determined that the insulated wire of the present invention has superior properties compared to the conventional wire and the comparative wire. The hermetic motor made by rotation molding is the best!
It is expected that the vehicle will be operated with a high degree of reliability over the following years.

Example 3 Next, using the insulated wires 2 and 8 of the present invention, 3.
10 75KW-3 phase-200■ hermetic motors
The stand was assembled and an accelerated life test was conducted in a refrigeration cycle as shown in the wfG diagram.

For comparison, insulation i! is made by sequentially applying and baking polyesterimide and polyamideimide. Similar tests were conducted on a motor in which the stator coil was wound with wire and a motor in which the stator coil was fixed in a conventional epoxy-based impregnated varnish for 8 tlf.

FIG. 6 shows the hermetic motor accelerated life test device used in this experiment. Test motor 1 is cold*
The electromagnetic contactor 3 is placed in a container 2 filled with R-22.
It is connected to the test power supply 4 via. Also container 2
The R-22 contained therein is sent to a cooler 6 through a pipe 5, where it is cooled and liquefied, and sent to the container 2 again through a pipe 7 and a solenoid valve 8 in a shuttle.

Another refrigerant cooled by the refrigeration unit 119 is sent to the refrigerant 7J] vessel 6, and the refrigerant R-22 in a vaporized state from the container 2 is cooled and liquefied.

FF1R with a 0N10FF cycle of 6/234 seconds is applied to test motor 1, and the rotor of motor 1 is locked (fixed).
Then, the severest electromagnetic vibration condition was reproduced by increasing the overcurrent load, and the lifespan of the motor 1 was compared relative to the number of 0N10FF cycles until the motor 1 was burnt out. 4th result
Shown in the table.

As is clear from Table 4, the hermetic motor using the self-adhesive insulated wire of the present invention has a superior lifespan compared to the conventional hermetic motor using the insulated wire treated with epoxy impregnated varnish. It can be seen that η is right and that there is little variation in the lifespan.

[Effects of the Invention] As explained above, the present invention uses a high molecular weight phenoxy resin and/or epoxy resin as a base polymer with a low content of sodium chloride, and a specific m of n.
- Adhesive layer made of a composition using butylated melamine resin as a crosslinking agent and a phenol salt of 1,8-diaza-bicyclo[5,4,O]unde-un-7 added as needed as a crosslinking density improver. A hermetic motor uses the self-adhesive insulated wire, which is freon-resistant, and the self-adhesive insulated wire as a stator coil.

Therefore, the adhesive layer of a coil formed by winding this self-adhesive insulated wire or a stator coil of a hermetic motor exhibits extremely high stability against Freon refrigerants such as R-22, and in fact almost never becomes Freon refrigerant. No longer dissolves. Therefore, resin may adhere to the pipes and capillaries from the compressor of the refrigerator to the condenser and evaporator, causing clogging.
In addition, there is no risk of leakage to the piston or cylinder of the compressor, causing seizure or wear. In addition, since sodium chloride is eluted into the fluorocarbon and becomes 4[, corrosion of copper piping due to this is prevented, chemical plating phenomenon on the motor shaft etc. due to the elution of copper ions is prevented, and the operating efficiency of the motor is improved. There is no decline.

Furthermore, since the adhesive layer has a high adhesive strength and does not deteriorate much even at high temperatures, the fixing strength of the coils is also high, and these coils can sufficiently withstand electromagnetic vibration A5 mechanical vibration. Furthermore, the epoxy group of the epoxy resin of the base polymer and the amino group of the n-butylated melamine resin capture hydrochloric acid generated by the reaction between Freon and refrigeration oil.1. It has the effect of suppressing this reaction, and prevents corrosion of metal parts within the freezing zone caused by this hydrochloric acid.

Furthermore, in the case where a crosslinking density improver was added, the degree of crosslinking was improved and the amount of freon-induced extractables was reduced.

(The hermetic motor of the present invention is
Incorporated into the J1 type refrigerated ~ I unit, refrigerant such as )
1 Even when operated in the presence of oil and under severe load fluctuations,
Much more reliable over a long period of time than conventional products1
Stably with 1), the circumference of the pressure machine, etc. 111jJI
There is no problem when turning to Z. In addition, manufacturing time for this hermetic motor is shorter than conventional impregnated varnish, etc., improving work efficiency and reducing the number of strokes required.

[Brief explanation of the drawing]

Figure 1 is a graph showing the molecular weight distribution of two types of phenoxy resins, Figure S52 is a graph showing the extraction rate of the adhesive layer of a self-adhesive insulated wire by Freon (R-22), and Figure 3 is a graph showing the extraction rate of adhesive layers of self-adhesive insulated wires after blister cycle. A graph showing the residual dielectric breakdown voltage (? rate), Figure 4 is a graph showing the adhesive force after the blister cycle, and Figure 5 is a graph showing the temperature dependence of the adhesive force in R-22. FIG. 6 is a schematic configuration diagram showing an accelerated life test apparatus for a hermetic motor.

Claims (2)

[Claims] (1) The sodium chloride content is 5 ppm or less, and the intrinsic viscosity determined at 25°C using tetrahydrofuran as a solvent is 0.
440 or higher phenoxy resin and/or 100 parts by weight of epoxy resin, and 20 to 1 part of n-butylated melamine resin.
00 parts by weight and 0.1 to 5 parts by weight of a phenol salt of 1,8-diaza-bicyclo(5,4,0)undecene-7, which is added as necessary, is used as an adhesive layer and an insulating layer is interposed therebetween. A self-adhesive insulated wire with freon resistance, which is provided on a conductor. (2) The sodium chloride content is 5 ppm or less, and the intrinsic viscosity determined at 25°C using tetrahydrofuran as a solvent is 0.
440 or higher phenoxy resin and/or 100 parts by weight of epoxy resin, and 20 to 1 part of n-butylated melamine resin.
00 parts by weight and 0.1 to 5 parts by weight of a phenol salt of 1,8-diaza-bicyclo(5,4,0)undecene-7, which is added as necessary, is used as an adhesive layer and an insulating layer is interposed therebetween. A motor for a hermetic compressor that uses a self-adhesive insulated wire provided on a conductor as a stator coil.