JP2815956B2 - Lubricating enamel wire for cooling - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lubricating enamel wire for cooling. More specifically, the present invention can exhibit excellent lubricity when winding a cooling electric device coil, and exhibit excellent durability when operating a cooling electric device obtained by the winding. The present invention relates to a lubricating enamel wire for cooling.

[Related Art] In recent years, there has been a remarkable progress in miniaturization of electric equipment and high-speed mechanical winding of coil winding work. As a result, enameled wires used in electric equipment are required to have excellent coil winding properties.

In other words, coil winding work for general-purpose electrical equipment is performed by a mechanical winding machine, and this mechanical winding machine has many guide members and the like, and the enamel wire passes through these guide members smoothly and a little. It is required to be free from trauma.

The coil winding property of an enameled wire depends on the following factors.

Finished outer diameter of enameled wire (Improved as the length becomes thinner) Softness of the conductor (Improved as it becomes softer) Surface slipperiness (Improved as the slipperiness increases) In particular, the surface slipperiness of the enameled wire greatly affects coil winding properties. . For this reason, enameled wires with improved surface slipperiness (hereinafter referred to as self-lubricating enameled wires) reduce the occurrence of trauma during high-speed machine winding work, improve the coil occupation rate in the stator slot, and reduce the number of coil ends. It is widely used as a magnet wire for general-purpose electrical equipment because it is effective for miniaturization and the like.

On the other hand, in order to respond to demands for improving the reliability and miniaturization of cooling electric equipment, for example, cooling motors, improvement of coil winding properties has become an important issue, and the application of self-lubricating enameled wire has been demanded. It had been.

At present, the following method is used as a method for lubricating a self-lubricating enameled wire.

(Method A): solid paraffin on the outer surface of the enameled wire
A method of applying a low melting point lubricant such as beeswax.

(Method B): Low molecular weight polyolefin (low molecular weight polyethylene, low molecular weight polypropylene, etc.) on the outer surface of the enameled wire
Method of applying and baking paint.

(Method C): A method of repeatedly applying and baking a lubricating polymer blend enamel paint obtained by blending an appropriate amount of a low-molecular-weight polyolefin, tetrafluoroethylene, or the like onto a conductive wire in the same manner as a general enameled wire.

(Method D): A lubricating polymer blend enamel paint obtained by blending an appropriate amount of a lubricating polymer, for example, low molecular weight polyolefin, tetrafluoroethylene, or the like, on the outer peripheral surface of the enameled wire is thinly applied (thickness: 3 to 5 μm) and baked. how to.

[Problems to be Solved by the Invention] However, these methods have the following problems and cannot be applied to electric appliances for cooling.

(Method A): The self-lubricating enameled wire of this method has a low melting point, so that the lubricant dissolves in the insulating varnish when the insulating varnish is thermally cured after coil winding, and as a result, the self-lubricating property is obtained. The adhesion between the enamel wire and the insulating varnish is large,
Further, there is a feature that the insulation performance is equivalent to that of a general enamel wire.

On the other hand, in the production of a self-lubricating enameled wire by this method, it is difficult to control the amount of the solid paraffin, beeswax, etc. applied, and as a result, an excessively applied amount of the self-lubricating enameled wire is often generated. Excessive solid paraffin, beeswax, and the like can clog the capillaries of the refrigerator and deteriorate the cooling effect of the cooling electric device.

(Method B): The self-lubricating enameled wire of method B has a high melting point of 90-150 ° C, which is applied to the low-molecular-weight polyolefin in the varnish during heat curing of the insulating varnish treatment after coil winding. It does not dissolve, and as a result, there is a problem that the adhesive force between the self-lubricating enameled wire and the insulating varnish is reduced. In addition, the low-molecular-weight polyolefin is extracted by the chlorofluorocarbon during the operation of the cooling electric device and clogs the capillary of the refrigerator, thereby deteriorating the cooling efficiency of the cooling electric device.

(Method C): The self-lubricating enameled wire of the method C has a drawback that the low molecular weight polyolefin and tetrafluoroethylene weaken the adhesion to the insulating varnish.

Further, the self-lubricating enameled wire obtained by the method C is inferior in appearance and various properties and has a large amount of chlorofluorocarbon extraction, and further has the disadvantage that blisters are easily generated when heated at a high temperature after immersion in chlorofluorocarbon.

(Method D): The self-lubricating enameled wire of Method D has a drawback that the blended low molecular weight polyolefin, tetrafluoroethylene, weakens the adhesion to the insulating varnish.

The self-lubricating enameled wire of Method D has better appearance and various characteristics than the self-lubricating enameled wire of Method C.

The present invention has been made in view of such a point, and aims at solving the above-mentioned disadvantages of the prior art and achieving excellent coil winding properties and Freon resistance as a magnet wire of a cooling electric device. An object of the present invention is to provide a lubricating enamel wire for cooling that can be exhibited.

[Means for Solving the Problems] The gist of the present invention is to focus on the above-mentioned Method A and apply a very small amount of a specific lubricant blended lubricating oil to an outer peripheral surface of a refrigerant resistant enamel wire. Lubricating enamel wire for cooling.

That is, the gist of the present invention is to provide a lubricant blended lubricating oil obtained by blending 1 to 50 parts by weight of a lubricant having a melting point of 90 ° C. or less with respect to 100 parts by weight of refrigerating machine oil, on the outer peripheral surface of the refrigerant-resistant enameled wire. A lubricating enamel wire for cooling, characterized by being coated with 0.001 to 0.5 mg / cm ² on a lubricating enamelled wire for cooling.

In the present invention, the refrigerating machine oil is used as the base oil of the lubricating oil because the lubricating oil has a good compatibility with the lubricant and a good slipperiness after the compatibilization, and a compatibility with the refrigerating machine oil used for electric appliances for cooling. Because it is good.

The refrigerating machine oil used here includes mineral refrigerating machine oil (naphthene refrigerating machine oil, paraffin refrigerating machine oil, etc.) and synthetic oil refrigerating machine oil (alkylbenzene refrigerating machine oil, poly-
α-olefin refrigerating machine oil) or a mixed refrigerating machine oil thereof can be used. JIS-
There is a grade of K-2211.

As the lubricant used in the present invention, one having a melting point of 90 ° C. or less and preferably having good compatibility with the insulating varnish of the coil is suitable.

The reason for limiting the melting point of the lubricant to 90 ° C or less here is that the lubricant at 90 ° C or higher does not melt at the time of heat curing of the insulating varnish treatment,
As a result, there is a problem that a large amount of the lubricant remains on the outer peripheral surface of the refrigerant-resistant enamel wire and weakens the adhesive strength between the refrigerant-resistant enamel wire and the insulating varnish.

In the present invention, the melting point is 90 with respect to 100 parts by weight of refrigerating machine oil.
The reason for limiting the blending of the lubricant at a temperature of not more than 1 ° C. to 1 to 50 parts by weight is that a synergistic improvement effect of the sliding property with the refrigerating machine oil cannot be exerted at a content of 1 part by weight or less. In other words, the synergistic improvement effect of the slip property is caused by the mutual slip between the liquid refrigerating machine oil and the semisolid lubricant having a melting point of 90 ° C. or less. If the amount is less than 1 part by weight, the mutual slip cannot be exhibited. It is.

Conversely, if the lubricant is 50 parts by weight or more, the improvement in slipperiness in proportion to the blending amount cannot be obtained, and when operating as an electric device for cooling, the lubricant precipitates and clogs the capillary,
This is to reduce the cooling efficiency.

Specific refrigerant-resistant enamel wires used in the present invention include a polyimide wire, a polyamide imide wire, a tris-2-hydroxyethyl isocyanurate-modified polyester imide wire, a tris-2 hydroxyethyl isocyanurate-modified polyester amide imide wire, and a tris-2. Hydroxyethyl isocyanurate-modified polyester wire, polyamide imide overcoat tris-2hydroxyethyl isocyanurate-modified polyester imide wire, polyamide imide overcoat tris-2 hydroxyethyl isocyanurate-modified polyester amide imide wire,
Polyamide imide overcoat Tris-2 hydroxyethyl isocyanurate-modified polyester wire, polyhydantoin 1000, polyparabanic acid wire, polyamide imide undercoat polyester imide wire, polyamide imide undercoat formal wire and the like.

[Function] The lubricating enamel wire for cooling of the present invention uses a blend of 1 to 50 parts by weight of a lubricant having a melting point of 90 ° C. or less with respect to 100 parts by weight of refrigerating machine oil as a lubricating oil applied to the outer peripheral surface thereof. Ensures that the lubricant blend lubricating oil with poor adhesion dissolves and diffuses into the insulating varnish when the coil is treated with the insulating varnish, thereby effectively improving the adhesion between the surface of the lubricating enameled wire for cooling and the insulating varnish. To do that.

Further, the lubricant blended lubricant oil, by 0.001 to 0.5 mg / cm ² applied to the outer peripheral surface of the refrigerant resistance enameled wire, excellent excess with ensuring the sliding property to avoid the application of the lubricant blended lubricants of lubricant This is because precipitation is completely suppressed, and as a result, clogging of the capillary by the precipitated lubricant is completely suppressed.

In the present invention, the base enameled wire is defined as a specific refrigerant-resistant enameled wire because these refrigerant-resistant enameled wires have good compatibility with the lubricant blended lubricating oil and have good refrigerant-resistant properties, so that the coil wound This is because when the wire is used, it exhibits excellent slipperiness, and when operated as a cooling electric device, effectively prevents clogging of the capillaries due to the enamel wire film extract due to chlorofluorocarbon.

Example Next, an example of a lubricating enamel wire for cooling according to the present invention will be described together with a comparative example.

Here, the base enamel wire used in Examples and Comparative Examples was a polyamide imide overcoat polyester amide imide wire (hereinafter AI / E) having a conductor diameter of 0.950 mmφ and a coating thickness of 0.045 mm.
AIW).

Table 1 shows the test results of Examples and Comparative Examples of the lubricating enamel wire for cooling of the present invention.

(Comparative Example 1) AI / EAIW itself to which no lubricant blend lubricating oil was applied.

(Comparative Example 2) A lubricant blended lubricating oil obtained by heating and dissolving 0.5 g of beeswax in 100 g of refrigerating machine oil (Suniso 3GSD, naphthenic mineral oil of Nippon Sun Oil) on the outer peripheral surface of AI / EAIW while heating to 70 ° C.
It is a self-lubricating enameled wire coated with 022 mg / cm ² (0.11 mg / 1 g of enameled wire).

(Comparative Example 3) A self-lubricating enameled wire manufactured in the same manner as the enameled wire of Comparative Example 1 except that the amount of beeswax blended was 60 g.

(Comparative Example 4) A self-lubricating enameled wire manufactured in the same manner as the enameled wire of Comparative Example 1 except that the application amount of the blended lubricating oil was 0.022 mg / cm ² .

(Comparative Example 5) A self-lubricating enameled wire manufactured in the same manner as the enameled wire of Comparative Example 1 except that the application amount of the blended lubricating oil was 0.6 mg / cm ² .

Comparative Example 6 70 ° C. of wax alone with melting point of 60 ° C. on the outer surface of AI / EAIW
Is a self-lubricating enameled wire formed by applying 0.022 mg / cm ² (0.11 mg / g of enameled wire) while heating.

(Example 1) A lubricant blended lubricating oil obtained by heating and dissolving 1 g of beeswax in 100 g of refrigerating machine oil (Suniso 3GSD, naphthenic mineral oil of Nippon San Oil) on the outer periphery of the surface of AI / EAIW was heated to 70 ° C while heating to 0.02.
This is a lubricating enamel wire for cooling that is coated by ² mg / cm ² (0.11 mg / 1 g of enamel wire).

(Examples 2 to 4) A lubricating enamel wire for cooling was produced in the same manner as in Example 1 except that the blended amount of beeswax was changed.

(Examples 5 to 7) Example 1 except that the application amount of the lubricant blended lubricating oil was changed.
A lubricating enamel wire for cooling is produced in the same manner as in the above.

 The test method is as follows.

(Lubricant Blend Lubricating Oil) The amount of application was obtained by weighing an enameled wire of a predetermined length before and after application with an analytical balance and dividing the weight difference by the surface area of the enameled wire.

(Static Friction Coefficient) The static friction coefficient was measured by a wire and wire method (a test method of a static friction coefficient between enameled wires).

(Deterioration test of refrigerator oil) In the deterioration test of refrigerator oil, a test enameled wire was sampled in an amount approximately 1.4 times the amount used for one cooling motor, and a sample of the test enameled wire was subjected to 180 ° C Freon-22. -It was immersed in refrigerator oil for 24 hours, and the deterioration degree of the refrigerator oil after 24 hours was evaluated.

Indication of appearance ：: Transparent and no abnormality Δ: Slight turbidity generated X: Turbidity generated Pour point Tested according to JIS-K-2269.

Flock point Temperature at which wax precipitates in refrigerating machine oil measured by ANSI / ASHRAE-86-1983.

Felix load resistance test Lubricity of refrigerating machine oil measured by ANSI / ASTM-D3233-73. (The larger the value, the better the lubricity.) Total acid value Tested according to JIS-K-2501-1980. Mg of potassium hydroxide required to neutralize free fatty acids contained in 1 g of refrigerator oil. The lower the value, the smaller the thermal deterioration of the refrigerating machine oil.

(Adhesion with insulating varnish) First, create a model coil using NEMA-MW-1000, and then attach the model coil to WF.
-292 (Hydraulic insulating varnish manufactured by Hitachi Chemical Co., Ltd.), immersion treatment, take out, suspend and drop, and then 135 ° C
It was dried for 1 hour, further immersed in WF-292 again, suspended and dropped in the same manner, and then dried at 135 ° C. for 1 hour.

Next, the obtained insulating varnish-treated model coil was NEMA-
An adhesion test was performed using MW-1000. The evaluation of the adhesiveness is marked with a circle when the adhesive strength is 15 kg or more, and marked with a triangle when 14 to 10 kg, and 10 kg.
The following are indicated by crosses.

As is clear from Table 1, the AI / EAIW of Comparative Example 1 has a large static friction coefficient of 0.22, that is, the slipperiness is considerably poor. Further, the AI / EAIW of Comparative Example 1 has a small Pharex load capacity.

In the self-lubricating enameled wire of Comparative Example 2, since the blending amount of the beeswax was too small, a remarkable improvement in the slipperiness was not seen.

In the self-lubricating enameled wire of Comparative Example 3, since the amount of beeswax blended is too large, the self-lubricating enameled wire has a large tendency to deteriorate the refrigerating machine oil used in the refrigerating machine. That is, the refrigerating machine oil after the test had the disadvantage that the appearance became cloudy and the floc point increased. The refrigerating machine oil having the appearance turbidity and the increased floc point causes the refrigerating machine capillary of the electric appliance for cooling to be clogged, resulting in a decrease in cooling efficiency and a failure.

In the self-lubricating enameled wire of Comparative Example 4, since the amount of the lubricant blended lubricating oil applied was too small, the improvement in the slipperiness was hardly observed.

The self-lubricating enameled wire of Comparative Example 5 had disadvantages such as turbidity of the refrigerating machine oil, an increase in the floc point, an increase in the acid value, etc. because the amount of the lubricant blended lubricating oil applied was too large.

Since the self-lubricating enameled wire of Comparative Example 6 was a single beeswax lubricating oil, the refrigerating machine oil deteriorated severely and the adhesion to the insulating varnish also deteriorated.

On the other hand, the lubricating enamel wires for cooling of Examples 1 to 9 all have a good appearance and exhibit excellent slipperiness, and do not deteriorate the refrigerating machine oil even when they coexist with the refrigerating machine oil, and further provide insulation. The results showed strong adhesion when treated with varnish.

[Effect of the Invention] The lubricating enamel wire for cooling of the present invention exhibits excellent slipperiness when winding an electric device coil, and strongly adheres to the insulating varnish when subjected to an insulating varnish treatment after winding. When it is operated as electrical equipment for use, it can completely prevent clogging of the refrigerator capillary and can exhibit excellent operation efficiency, and is industrially useful.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10M 159: 04 159: 06) C10N 20:00 40:32 (72) Inventor Yoshiyuki Tetsu 1500 No.1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable Inside the Toyoura Plant, Ltd. (72) Inventor Sadami Itonaga 1500, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable Inside the Toyoura Plant Co., Ltd. (72) Inventor Shinichi Okada 1500, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable, Ltd. 72) Inventor Keisuke Yamanaka 7-1-1, Higashi-Narashino, Narashino-shi, Chiba Pref. 56) References JP-A-60-158507 (JP, A) JP-A-61-269808 (JP, A) JP-A-58-16411 (JP, A) 120025 (JP, U) JP-B 63-51193 (JP, B2)

Claims (4)

(57) [Claims] 1. A lubricant blended lubricating oil obtained by blending 1 to 50 parts by weight of lubricating oil having a melting point of 90 ° C. or less with respect to 100 parts by weight of a refrigerating machine oil on the outer peripheral surface of a refrigerant-resistant enameled wire.
A lubricating enamel wire for cooling, characterized by being coated in mg / cm ² . 2. The lubricating enamel wire for a cooling machine according to claim 1, wherein the lubricant is waxy only at a melting point of 90 ° C. or less. 3. The lubricating enamel wire for a cooling machine according to claim 1, wherein the lubricant is solid paraffin having a melting point of 90 ° C. or less. 4. The refrigerant-resistant enameled wire is a polyimide wire, a polyamide imide wire, a tris-2-hydroxyethyl isocyanurate-modified polyester imide wire, a tris-2-hydroxyethyl isocyanurate-modified polyester amide imide wire, and a tris-2 hydroxyethyl isocyanurate. Modified polyester wire, polyamide imide overcoat tris-2 hydroxyethyl isocyanurate modified polyester imide wire, polyamide imide overcoat tris-2 hydroxyethyl isocyanurate modified polyester amide imide wire, polyamide imide overcoat tris-2 hydroxyethyl isocyanurate modified polyester Wire, polyhydantoin wire, polyparabanic acid wire, polyamide imide undercoat polyester imide wire, polyamide wire Cooling lubricating enameled wire according to claim 1, characterized in that the one selected from among de undercoat formal line.