JP2001126917A - Magnet coil and motor for hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form surely insulation of a magnet wire and obtain a motor for a compressor which has the degree of freedom concerning the volume resistivity of refrigerator oil. SOLUTION: A magnet coil 3 is formed by winding a magnet wire 1 with an insulation coating film, and dipped in electrolyte 4 containing polymerizable monomar. By using the magnet wire 1 as an electrode, electrolytic polymerization is performed, and a coating film is formed in the defective part of the magnet wire insulation coating film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet used for a transformer or a motor, that is, a magnet coil, and a motor for a hermetic compressor using the same.

[0002]

2. Description of the Related Art In recent years, with the miniaturization and high performance of electronic equipment, it has been desired to reduce the size and efficiency of the magnet coil itself, which is a component of the equipment, and to provide a large amount of insulation in a limited space. Magnet wires, which are coated electric wires, are being introduced. For this reason, a magnet wire having a thinner insulating film is required. In addition, when a large number of electric wires are packed in a limited space, the magnet wire is liable to be damaged by an insulating film by a needle or the like of an automatic winding machine.

[0003] With respect to the magnet wire, several μm to
A magnet wire formed with an insulating film of about 0 μm has been proposed and used. Usually, a magnet wire is manufactured by applying and baking an insulating varnish to a metal conductor stretched linearly.

As a material used for the insulating film of the magnet wire, it is necessary to withstand the process of applying stress such as tension or friction to the electric wire such as the winding process as described above, and to secure the insulating property. The conductive resin is provided in a single layer or multiple layers.

As a method of forming a thin insulating film on a metal conductor, a method of forming a thin polymer film of an electrically insulating polymer on the metal conductor by using an electrolytic polymerization method with the metal conductor as an electrode is considered. . As a literature on a method for forming an electrically insulating polymer thin film on a conductor by electrolytic polymerization, see, for example, Electrokina Acta, Vol. 22, pp. 451-457, 19
77 years (E1 electrochimica Acta, 2
2, 451-457 (1977)), and Journal of Applied Electrochemistry, Vol. 9, pp. 483-493, 1979 (Jorna 1 of).
App1edE1electrochemistry,
9, 483-493 (1979)).

[0006] With respect to hermetic compressor motors, leakage current is likely to occur due to the presence of refrigerant and refrigerating machine oil inside the compressor, and the motor is used together with refrigerating machine oil having a high volume resistivity, or a varnish for coating a magnet coil. The coating process has been performed.

[0007]

As described above, in order to reduce the size and increase the efficiency of the magnet coil, many magnet wires have been packed in a limited space. There is a need for thinner magnet wires.

Further, there is a problem that the magnet wire is easily damaged by the insulating film due to the molding process of packing many electric wires in a limited space, and the yield of the magnet coil is reduced.

In the case of a hermetic compressor motor, an insulating defect exists in the insulating film of the magnet wire, and a leakage current is generated between magnet wires having different polarities or between a ground electrode such as an iron core and a casing. Characteristics in terms of fluidity and compatibility with the refrigerant are preferable, but the volume resistivity is 10 ¹³
There is a problem that a refrigerating machine oil of less than Ωcm cannot be used.

[0010]

In order to solve the above-mentioned problems, a first aspect of the present invention is a magnet coil formed by winding a magnet wire with an insulating film, wherein the electrolytic solution contains a polymerizable monomer. Is a motor magnet in which a film is formed on a defective portion of a magnet wire insulating film by performing electrolytic polymerization using a magnet wire as an electrode by dipping in a magnet wire.

A second aspect of the present invention is a magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core, wherein after the inserting step, a polymerizable monomer is formed. A magnet coil in which a polymer film is formed on the surface of an iron core by immersing it in an electrolytic solution to perform electrolytic polymerization using the iron core as an electrode.

A third aspect of the present invention is a magnet coil configured by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core, wherein after the inserting step, a polymerizable monomer is formed. This is a motor for a hermetic compressor having a magnet coil formed by immersing in a contained electrolytic solution and performing electropolymerization using a magnet wire as an electrode and forming a film on a defective portion of a magnet wire insulating film.

[0013] A fourth aspect of the present invention is a magnet coil configured by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core. This is a motor for a hermetic compressor having a magnet coil in which a polymer film is formed on the surface of an iron core by immersing in an electrolytic solution to perform electrolytic polymerization using the iron core as an electrode.

In one embodiment of the present invention, the above-mentioned electrolytic solution contains a mono- or di-substituted alkyl or arylamine and sodium hydroxide, potassium hydroxide or an alkali metal alcoholate as an electrolyte, and the polymerizable monomer has a 4-position. Includes phenols or thiophenols that are unsubstituted and substituted or unsubstituted at other positions.

In one embodiment of the present invention, the electrolyte contains a mono- or di-substituted alkyl or aryl amine and sodium hydroxide or potassium hydroxide as an electrolyte, and the polymerizable monomer contains a substituted or unsubstituted pyrrole. .

According to one embodiment of the present invention, there is provided a magnet coil configured to be inserted into an iron core, wherein a film is formed on a defective portion of a magnet wire insulating film generated at the time of insertion after the inserting step. A magnet coil characterized in that:

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnet coil according to the present invention will be specifically described.

First, a first aspect of the present invention is a magnet coil formed by winding a magnet wire with an insulating film, which is immersed in an electrolytic solution containing a polymerizable monomer to perform electrolytic polymerization using the magnet wire as an electrode. A description will be given of a motor magnet in which a film is formed on a defective portion of a magnet wire insulating film.

The magnet wire is made of an electrically insulating polymer material such as an epoxy resin, a polyimide resin, a polyamide resin, a polyester resin, an acrylic resin, a vinyl ester resin, a polyvinyl formal resin, a fluororesin, etc. Are deposited by a method such as electrodeposition to cover these films. By winding this, a magnet coil is formed.

The metal constituting the metal wire is not particularly limited, but copper or a material containing copper as a main component is often selected from the viewpoints of conductivity, workability, and cost.

Since the magnetic force of the electromagnet is improved by providing a structure having an iron core inside the inner diameter of the magnet coil, when forming the coil, the magnet coil may be wound directly on the iron core or via an insulating paper. It is formed by inserting a magnet wire wound around a slot formed like a gap in an iron core directly or through an insulating paper.

In the above-mentioned winding step, the winding density is increased per unit volume by winding while applying tension to the magnet wire, and a highly efficient magnet coil is formed. Due to the nature, the stress on the insulating film may be excessive, or the insulating film may have a defect due to damage due to contact with the end face of the iron core or the needle of the winding machine.

The magnet coil is immersed in an electrolytic solution containing a polymerizable monomer with respect to the damaged portion of the insulating film as described above, and electrolytic polymerization is performed using the magnet wire as an electrode to cover the defective portion of the magnet wire insulating film. Is formed.

Examples of the polymerizable monomer include an aliphatic compound having a non-aromatic carbon-carbon double bond and an aromatic compound in which a nucleophilic substitution reaction occurs.

Preferably, phenol, thiophenol, aniline, thiophene, pyrrole, benzene, xylene, carbazole, indole, or a derivative thereof, in which polymerization proceeds by a stoichiometric electrochemical reaction that is easy to control in the electrolytic polymerization reaction. Are preferred.

In a further preferred embodiment, the electrolyte contains a mono- or di-substituted alkyl or arylamine and sodium hydroxide or potassium hydroxide as an electrolyte, and the polymerizable monomer is unsubstituted at the 4-position and the other is substituted at the other position. Examples include substituted or unsubstituted phenols or thiophenols.

A phenol derivative which is unsubstituted at position 4 and substituted or unsubstituted at positions 2, 3, 5, and 6 is represented by 2,
The substituents at positions 3, 5, and 6 are not particularly limited,
For example, having 1 to 12 carbon atoms, preferably 1 to 7 carbon atoms
A saturated or unsaturated aliphatic hydrocarbon group, or an aromatic hydrocarbon group having 6 to 12 carbon atoms, or an alkoxy group (RO-), an alkoxyalkyl group (ROR-), an acyl group (RCO-), or an alkoxycarbonyl group. Group (ROCO
-), An amide group (RCONH-), a carbamoylalkyl group (H2NCOR-), a hydroxyalkyl group (HO
R-) can be used. Here, R represents a monovalent or divalent alkyl group having 1 to 12 carbon atoms, preferably 1 to 7 carbon atoms.

The mono- or di-substituted alkyl or arylamine is not particularly limited, and examples of the arylamine include aniline, N-methylaniline, N-ethylaniline, diphenylamine, phenylenediamine and the like.

As the alkylamine, a mono- or dialkylamine having an alkyl group having 1 to 4 carbon atoms is preferably used. For example, methylamine, ethylamine, n-propylamine, isopropylamine,
n-butylamine, isobutylamine, t-butylamine, dimethylamine, diethylamine, di (n-propyl) amine, di (isopropyl) amine, di (n-butyl) amine, di (isobutyl) amine, di (t-butyl) Examples include amine, trimethylamine, triethylamine, tri (n-propyl) amine, tri (isopropyl) amine, tri (n-butyl) amine, tri (isobutyl) amine and tri (t-butyl) amine. Furthermore, mono-, di-, and alkyl groups each having 5 or more carbon atoms.
Alternatively, a trialkylamine or a substituted alkylamine such as ethanolamine, diethanolamine, and triethanolamine can be used.

The solvent of the electrolytic solution is not particularly limited as long as it is a solvent that dissolves sodium hydroxide, potassium hydroxide or an alkali metal alcoholate as a supporting electrolyte. Propylene carbonate, acetonitrile, methanol, ethylene glycol, Although water and the like can be used, in the present embodiment, methanol, ethanol, 1-propanol, 2
-Propanol, 1-butanol, 2-butanol, t
Mix alcohols such as -butyl alcohol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol and ethylene glycol, and polar solvents such as acetonitrile, dimethylformamide, dimethylsulfoxide, N-methylpyrrolidone (NMP) and propylene carbonate. Electrolytic polymerization can be easily carried out even in an aqueous solvent which has been used, which is preferable from the viewpoint of reducing environmental load.

The concentration of the phenol or thiophenol derivative in which the 4-position is unsubstituted and the other positions are substituted or unsubstituted is 0.01 to 10 mol / 1, preferably 0.1 to 2 mol / l.
Mol / 1.

The concentration of the mono- or di-substituted alkyl or aryl amine is 0.05-1 mol / 1, preferably 0.1-0.6 mol / 1. The concentration of sodium hydroxide, potassium hydroxide, or the alkali metal alcoholate is 0.1 mol in a molar amount relative to the phenol derivative which is unsubstituted at the 4-position and substituted or unsubstituted at the 2, 3, 5, and 6-positions. The amount is 5-2 times, preferably 0.5-1.2 times.

At the time of the electrolytic polymerization reaction, iron,
Various materials such as stainless steel, aluminum, palladium, platinum, gold, and carbon can be used.

The electrode potential of the working electrode in the electrolytic polymerization reaction depends on conditions such as the chemical structure of phenol or thiophenol in which the 4-position used is unsubstituted and the other position is substituted or unsubstituted, or an alkaline aqueous solution. is there. At this time, the voltage applied between the electrodes is not particularly limited, but is preferably 0.5 to 5 V, for example.

By the above-described electrolytic polymerization, an insulating polymer film is formed on the defective portion of the magnet wire insulating film, and the insulating defects are reduced or eliminated. A magnet coil having an excellent dielectric strength can be obtained.

In another preferred embodiment, the electrolyte contains a mono- or di-substituted alkyl or aryl amine and sodium or potassium hydroxide or an alkali metal alcoholate as an electrolyte, and the polymerizable monomer is substituted or unsubstituted. Of pyrrole.

The substituted or unsubstituted pyrrole is not particularly restricted but includes, for example, a saturated or unsaturated aliphatic hydrocarbon group having 1 to 12 carbon atoms, preferably 1 to 4 carbon atoms, or 6 carbon atoms. To 12 aromatic hydrocarbon groups, or an alkoxy group (RO-), an alkoxyalkyl group (ROR-), an acyl group (RCO-), an alkoxycarbonyl group (ROCO-), an amide group (RCONH)
-), A pyrrole derivative in which a hydroxyalkyl group (HOR-) or the like is substituted at the 2- or 5-position and pyrrole can be used.

The concentration of the substituted or unsubstituted pyrrole is
0.01-10 mol / 1, preferably 0.1-2 mol /
It is one.

The same applies to mono- or di-substituted alkyl or aryl amines and electrolytes.

Since the electrolytic solution contains mono- or di-substituted alkyl or aryl amine and sodium hydroxide, potassium hydroxide, or alkali metal alcoholate as the electrolyte, the copper surface exposed to the insulation defect existing in the magnet wire is not affected. A stable electropolymerization is possible because the mono- or di-substituted alkyl or arylamine dissolves the passive phase and forms an active surface of copper during electrolysis while forming the active phase.

Further, since the polymer of pyrrole has conductivity, the progress of electrolytic polymerization continues and a thick film can be formed.

After the electrolytic polymerization, undoping is performed by performing electrolysis in a reverse electric field in an acidic or neutral electrolyte solution, or chemical immersion is performed by immersing in an aqueous solution such as sodium sulfite as a reducing solution. By performing the de-doping, it can be changed to an electrical insulating property.

In the magnet wire thus formed, an insulating polymer film is formed on a defective portion of the magnet wire insulating film, and the insulating defects are reduced or eliminated.
Due to the high winding density, a magnet coil having high efficiency and sufficient dielectric strength can be obtained.

Next, a second aspect of the present invention is a magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core. A magnet coil in which a polymer film is formed on the surface of an iron core by immersing in an electrolytic solution containing a conductive monomer and performing electrolytic polymerization using the iron core as an electrode will be described.

Examples of the polymerizable monomer include an aliphatic compound having a non-aromatic carbon-carbon double bond and an aromatic compound in which a nucleophilic substitution reaction occurs.

The aromatic compound in which the nucleophilic substitution reaction occurs is the first compound.
It is the same as the aspect. Examples of the polymerizable monomer having a non-aromatic carbon-carbon unsaturated bond include, but are not particularly limited to, acrylamide, methacrylamide, hydroxyalkyl acrylate (for example, hydroxyethyl acrylate), and hydroxyalkyl methacrylate (for example, hydroxyethyl). (Methacrylate), acrylic acid, methacrylic acid, polyalkylene glycol (di) acrylate (for example, polyethylene glycol (di) acrylate), polyalkylene glycol (di) methacrylate (for example, polyethylene glycol (di) methacrylate), dialkylaminoalkyl acrylate, Dialkylaminoalkyl methacrylate, acryloyloxyalkyltrialkylammonium chloride, methacryloyloxyalkyl Carbon such trialkyl ammonium chloride - can be used a polymerizable monomer having a carbon-carbon unsaturated bond.

The concentration of the polymerizable monomer is 0.01-10
Mol / l, preferably 0.1-2 mol / l.

Since the iron core is often electrically grounded, since the magnet coil and the iron core are adjacent to each other, if a defect exists in the magnet coil insulating film, insulation failure occurs between the iron core and the magnet coil. Will be.

By performing electrolytic polymerization using the iron core as an electrode, an insulating polymer film is formed on the surface of the iron core, so that insulation between the iron core and the magnet coil can be ensured.

The supporting electrolyte of the electrolytic solution is not particularly limited, but it is preferable that the electrolytic solution is basic in order to prevent oxidation of iron.

Others can be performed in the same manner as the first aspect of the present invention.

Next, a third aspect of the present invention is a magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core. A description will be given of a motor for a hermetic compressor having a magnet coil in which a magnet wire having a film formed on a defective portion of a magnet wire insulating film by performing immersion in an electrolytic solution containing a conductive monomer and performing electropolymerization using a magnet wire as an electrode.

In the hermetic compressor motor having the magnet coil formed in the same manner as in the first aspect, since the insulation between the magnet coils can be ensured, the circuit in which the working medium including the refrigerant and the refrigerating machine oil is sealed is provided. When applied as a compressor motor for a refrigeration cycle used in a refrigeration cycle, there is no leakage of current that may cause a problem such as electric shock, and furthermore, the electric insulation is not extremely high, for example, a volume of about 10 ¹⁰ -10 ¹² Ωcm Refrigeration oil having a specific resistance can be used.

Although the volume resistivity is not sufficiently high, the solubility of the flammable hydrocarbon refrigerant is very low, and the refrigerating cycle requires a small amount of refrigerant to be charged. To make things possible.

Next, according to a fourth aspect of the present invention, there is provided a magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core. A motor for a hermetic compressor having a magnet coil having a polymer film formed on the surface of an iron core by performing immersion in an electrolytic solution containing a conductive monomer to perform electrolytic polymerization using an iron core as an electrode will be described.

In the hermetic compressor motor having the magnet coil formed in the same manner as in the second aspect, since the insulation between the magnet coils can be secured, the circuit in which the working medium composed of the refrigerant and the refrigerating machine oil is sealed. When applied as a compressor motor for a refrigeration cycle used in a refrigeration cycle, there is no leakage of current that may cause a problem such as electric shock, and furthermore, the electric insulation is not extremely high, for example, a volume of about 10 ¹⁰ -10 ¹² Ωcm Refrigeration oil having a specific resistance can be used.

Although the volume resistivity is not sufficiently high, the solubility of the flammable hydrocarbon refrigerant is very low, and the refrigerating cycle uses a polar oil which requires a small amount of refrigerant to be used as the refrigerating machine oil. To make things possible.

[0058]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples unless it exceeds the gist.

(Example 1) As shown in FIG.
A magnet coil 3 formed by winding a magnet wire 1 formed by winding a copper wire having a polyester insulating film of 0.5 mm and having a wire diameter of 0.5 mm into an iron core 2 was heated to 0.7 mol / l of 2-allylphenol and hydroxylated. Potassium 0.7mol /
1 of water: methanol = 75: 25% by volume of an aqueous alkaline solution as an electrolytic solution 4 is immersed so that the magnet wire 1 is completely immersed therein, and a lead wire 6 from the magnet wire and a platinum electrode which is a counter electrode are immersed. A voltage was applied so that the potential between the two electrodes was 3 V using the magnet wire as an anode during 7, and electrolysis was performed for 10 minutes. After the electrolysis, remove the magnet coil, wash it with water, and
Drying was performed for 2 hours.

The magnet coil thus obtained was immersed in a 0.1 mol / l saline solution, and the conduction between the magnet wires was examined.

Example 2 As shown in FIG. 1, a magnet wire 1 formed by winding a 0.5 mm-diameter copper wire having a 7 μm-thick polyester-based insulating film and being inserted into an iron core 2 was formed. Coil 3 with pyrrole 0.3mo
1 / l, potassium hydroxide 0.1 mol / l, diethylamine 0.3 mol / l, water: methanol = 75: 25 vol. And electrolysis was performed for 10 minutes by applying a voltage between the lead wire 6 from the magnet wire and the platinum electrode 7 as a counter electrode so that the potential between the two electrodes was 3 V using the magnet wire as an anode. . After the electrolysis, the magnet coil was taken out and washed with water.

Subsequently, the substrate was immersed in an aqueous solution of sodium hydrosulfite 0.1 mol / l for 10 seconds, washed with water and dried.

The magnet coil thus obtained was subjected to a pressure test between the iron cores of the magnet wires.
It had a withstand voltage of 0 kV or more.

(Embodiment 3) As shown in FIG.
A magnet coil 3 formed by inserting a magnet wire 1 formed by winding a copper wire having a polyester insulation film of 0.5 mm in wire diameter into an iron core 2 to form a 2,6-dimethylphenol 0.5 mol / l, 0.2m of diethylamine
ol / l, potassium hydroxide 0.5 mol / l water: methanol = 75: 25 volume% alkaline aqueous solution is immersed in an electrolytic tank 5 storing as an electrolytic solution 4 so that the magnet wire 1 is completely immersed in the iron core. Electrolysis was performed for 3 minutes by applying a voltage between the attached magnet type terminal 8 and the platinum electrode 7 as a counter electrode with the iron core 2 as an anode so that the potential between the two electrodes was 3 V. After the electrolysis, the magnet coil was taken out, washed with water, and dried.

The magnet coil thus obtained was immersed in a 0.1 mol / l saline solution, and the conduction between each phase of the magnet wire and the iron core was examined. All the coils were insulated.

Example 4 A sealed compressor was manufactured by using the magnet coils formed in Examples 1 and 3 as a stator and a rotor for a hermetic compressor in combination with a rotor using a permanent magnet. . Further, using these, propane as a refrigerant and a volume resistivity of 1 as a refrigerating machine oil are used.
A refrigeration cycle filled with a carbonate oil of 0 ¹² Ωcm was constructed, and the leakage current between each phase and the iron core when a commercial power supply was applied was measured. In any case, the leakage current was about 0.7 mA, which was a level having no practical problem.

(Comparative Example 1) A magnet coil formed by winding a 0.5 mm-diameter copper wire having a 10 μm-thick polyester-based insulating film into a steel core was inserted into an iron core to form a stator. Was used as a hermetic compressor motor in combination with a rotor using the same, and a hermetic compressor was manufactured using these motors. Further, using these, propane as a refrigerant and a volume resistivity of 10 as a refrigerating machine oil are used.
A refrigeration cycle filled with a carbonate oil of ¹² Ωcm was constructed, and the leakage current between each phase and between the iron core and a commercial power supply was measured. The leakage current is 1.3-1.6 during any time
It was as large as about mA, and had a problem in practical use.

[0068]

According to the present invention, a magnet coil having sufficiently high insulation between the coils or between the coil and the iron core can be obtained.

With respect to the hermetic compressor motor, it is possible to obtain a hermetic compressor motor that can use refrigerating machine oil having a volume resistivity of less than 10 ¹³ Ωcm.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a process of forming a magnet coil according to first and second embodiments of the present invention.

FIG. 2 is a diagram illustrating a process of forming a magnet coil according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet wire 2 Iron core 3 Magnet coil 4 Electrolyte 5 Electrolyte bath 6 Lead wire 7 Counter electrode 8 Magnet type terminal

Claims (8)

[Claims] 1. A magnet coil formed by winding a magnet wire with an insulating film, wherein the magnet coil is immersed in an electrolytic solution containing a polymerizable monomer to perform electrolytic polymerization using the magnet wire as an electrode, and a defective portion of the magnet wire insulating film. Magnet coil with a film formed on it. 2. An electrolyte comprising a mono- or di-substituted alkyl or arylamine and sodium hydroxide as an electrolyte,
2. The magnet coil according to claim 1, comprising potassium hydroxide or an alkali metal alcoholate, wherein the polymerizable monomer contains phenol or thiophenol in which the 4-position is unsubstituted and the other positions are substituted or unsubstituted. 3. An electrolyte comprising a mono- or di-substituted alkyl or arylamine and sodium hydroxide as an electrolyte.
2. The magnet coil according to claim 1, wherein the polymerizable monomer contains potassium hydroxide or an alkali metal alcoholate, and the polymerizable monomer contains a substituted or unsubstituted pyrrole. 4. A magnet coil configured to be inserted into an iron core, wherein a film is formed on a defective portion of a magnet wire insulating film generated at the time of insertion after the inserting step. 1 magnet coil. 5. A magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core, and immersing the magnet coil in an electrolytic solution containing a polymerizable monomer after the inserting step. A magnet coil with a polymer film formed on the surface of the iron core by performing electrolytic polymerization using the iron core as an electrode. 6. A magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core, wherein the magnet coil is immersed in an electrolytic solution containing a polymerizable monomer after the inserting step. A motor for a hermetic compressor having a magnet coil with a film formed on a defective portion of a magnet wire insulating film by performing electrolytic polymerization using a magnet wire as an electrode. 7. The electrolyte according to claim 6, wherein the electrolyte contains sodium hydroxide or potassium hydroxide as an electrolyte, and the polymerizable monomer is a substituted or unsubstituted pyrrole.
A hermetic compressor motor as described in the above. 8. A magnet coil formed by inserting a magnet coil formed by winding a magnet wire with an insulating film into an iron core, wherein the magnet coil is immersed in an electrolytic solution containing a polymerizable monomer after the inserting step. A motor for a hermetic compressor having a magnet coil having a polymer film formed on the surface of an iron core by performing electrolytic polymerization using an iron core as an electrode.