JP5337972B2 - Lubricating insulated wire and motor using the same - Google Patents

Abstract

Disclosed is a lubricating insulated electric wire comprising a lubricating agent coated onto an insulated electric wire comprising a conductor and an insulating layer covering the conductor. The lubricating insulated electric wire is characterized in that the lubricating agent is formed of an aliphatic acid ester which has an ester group in its molecule and is liquid at room temperature. The lubricating insulated electric wire is excellent in surface slipperiness and fixation to varnish. There is also provided a motor comprising a coil and the lubricating insulated electric wire wound around the coil. The motor can simultaneously realize excellent reliability of insulating properties and excellent fixation between the insulated electric wire and varnish.

Description

  The present invention relates to a lubricated insulated wire and a motor using the same. More specifically, for example, the present invention relates to a lubricating insulated wire that can be suitably used for an air conditioner, a compressor motor used in a refrigerator, a transformer, and the like, and a motor having a coil around which it is wound.

  An insulated wire is composed of a conductor and an insulating layer covering the conductor, and when this insulating layer is damaged, there is a risk of causing a layer failure or a grounding failure. Therefore, for example, in a distributed winding motor, when the coil around which the insulated wire is wound is inserted into the core of the status lot, the insulating layer of the insulated wire is damaged by rubbing, resulting in a layer failure or a ground failure. In order to avoid this, slipping is imparted to the insulated wire by applying a lubricant to the insulated wire. Conventionally, it has been proposed to use, for example, liquid paraffin, which is an organic lubricating oil that is liquid at room temperature, as a lubricant for imparting slipperiness to an insulated wire (for example, column 4 34 to 39 of Patent Document 1). See line etc.). Moreover, the method of improving the slipperiness of an insulated wire by making lubricating components, such as paraffins and wax, contain in an insulating layer is also taken (for example, refer patent document 2).

Japanese Examined Patent Publication No. 7-73008 Japanese Patent No. 36866576

  However, when the slip of an insulated wire is improved, when the coil made of the insulated wire is impregnated with varnish, the wettability of the varnish to the insulated wire is reduced, so the adhesion between the insulated wire and the varnish is reduced. To do. On the other hand, if the slip of the insulated wire is reduced in order to improve the wettability of the varnish to the insulated wire, the dynamic friction coefficient when inserting the coil into the core of the status lot increases and the insertion pressure increases, There is a risk that workability may be reduced, or the insulating layer of the insulated wire may be damaged by rubbing when the coil is inserted into the core, resulting in poor insulation.

  This invention is made | formed in view of the said prior art, and makes it a subject to provide the lubricity insulated wire excellent in both surface slipperiness | sticking property and adhesiveness with a varnish. In the present invention, the reliability of the insulation performance is enhanced by making the insulation layer of the insulated wire less susceptible to damage by sliding when the coil is inserted into the core of the status lot at the time of manufacture. It is another object of the present invention to provide a motor having excellent adhesion between an insulated wire and a varnish.

  The present invention relates to a lubricated insulated wire obtained by applying a lubricant to an insulated wire comprising a conductor and an insulating layer covering the conductor, wherein the lubricant has an ester group in the molecule and is a fatty acid ester that is liquid at room temperature The present invention relates to a lubricated insulated wire comprising Since the lubricating insulated wire of the present invention has the above-described configuration, it has excellent surface slipperiness and a low coefficient of dynamic friction when the coil is inserted into the core of the status lot. In addition to improving the properties, it is not easily damaged by rubbing when the coil is inserted into the core, and also has excellent adhesion to the varnish.

  When the fatty acid ester is a fatty acid triester having three ester groups in the molecule, the lubricating insulated wire of the present invention has excellent surface slipperiness and the coil is inserted into the core of the status lot. Since the dynamic friction coefficient at the time is small, the insertion pressure is low, the workability is improved, and the coil is less likely to be damaged by rubbing when inserted into the core, and has excellent adhesion to the varnish. .

In the lubricating insulated wire of the present invention, the fatty acid triester is represented by the formula (I):
R ¹ —C (CH ₂ OOC—R ² ) ₃ (I)
(Wherein R ¹ represents an alkyl group having 1 to 4 carbon atoms, and R ² represents an alkyl group having 8 to 12 carbon atoms)
In the case of the fatty acid triester represented by the formula (1), the surface slipperiness can be further improved and the adhesion to the varnish is excellent.

In the fatty acid triester represented by the above formula (I), the lubricated insulated wire of the present invention has its surface when R ¹ is an ethyl group and R ² is an alkyl group having 9 to 11 carbon atoms. Excellent slipperiness and adhesion to varnish.

  When the outermost layer of the insulating insulated wire of the present invention contains at least one resin selected from the group consisting of polyamideimide, polyesterimide, polyimide, polyamide, polyester and polyurethane, Excellent adhesion.

  When the outermost layer of the insulating layer is a self-bonding layer, the lubricating insulated wire of the present invention is excellent in the adhesion of the self-bonding layer and the surface slipperiness.

  Since the motor of the present invention has a coil wound with the lubricating insulated wire, the insulating layer of the insulated wire is damaged by sliding when the coil is inserted into the core of the status lot. Therefore, not only is the insulation performance reliable, but also the insulation between the insulated wire and the varnish is excellent.

  The lubricating insulated wire of the present invention is excellent in both surface slipperiness and adhesion to a varnish. Further, the motor of the present invention is excellent in reliability of insulation performance because the insulation layer of the insulated wire is not easily damaged by sliding when the coil is inserted into the core of the status lot at the time of manufacture. In addition, the adhesiveness between the insulated wire and the varnish is excellent.

  The lubricating insulated wire of the present invention is obtained by applying a lubricant to an insulated wire comprising a conductor and an insulating layer covering the conductor. In the present invention, the lubricant contains a fatty acid ester (hereinafter, simply referred to as “fatty acid ester”) which is liquid at normal temperature and has an ester group in the molecule. Since the lubricant containing the fatty acid ester is applied to the lubricating insulated wire of the present invention, it has excellent surface slipperiness and excellent adhesion to varnish.

  In the present specification, the lubricant containing a fatty acid ester contains a fatty acid ester as an essential component, but may contain other lubricants within a range that does not impair the object of the present invention. means.

Among the fatty acid esters, a fatty acid triester having three ester groups in the molecule is preferable from the viewpoint of improving the slipperiness of the surface and the adhesion between the insulated wire and the varnish, and the formula (I):
R ¹ —C (CH ₂ OOC—R ² ) ₃ (I)
(Wherein R ¹ represents an alkyl group having 1 to 4 carbon atoms, and R ² represents an alkyl group having 8 to 12 carbon atoms)
The fatty acid triester represented by these is more preferable.

In the formula (I), R ¹ represents an alkyl group having 1 to 4 carbon atoms. Specific examples of the alkyl group having 1 to 4 carbon atoms include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group and tert-butyl group. Among these, a methyl group and an ethyl group are preferred, and an ethyl group is more preferred from the viewpoint of improving the slipperiness of the surface of the lubricated insulated wire and the adhesion between the lubricated insulated wire and the varnish.

In the formula (I), R ² represents an alkyl group having 8 to 12 carbon atoms. Among the alkyl groups having 8 to 12 carbon atoms, an alkyl group having 9 to 11 carbon atoms is preferable from the viewpoint of improving the slipperiness of the surface of the lubricated insulated wire and the adhesion between the lubricated insulated wire and the varnish. Groups are more preferred.

  The lubricant containing the fatty acid ester may contain other lubricants such as liquid paraffin, spindle oil, velocite, refrigerating machine oil, and machine oil as long as the object of the present invention is not hindered. First, a surfactant, an aggregation inhibitor, an antifoaming agent, a leveling agent, an anti-settling agent, a wetting agent, a dispersing agent and the like may be contained.

  The insulated wire used in the present invention may be either a round wire or a flat wire. Moreover, the kind of conductor used for an insulated wire, its diameter, the kind of insulating layer, etc. should just be the same as what is generally used for the insulated wire.

  Examples of the resin suitable for the insulating layer include polyamideimide, polyesterimide, polyimide, polyamide, polyester, polyurethane, polyvinyl chloride, polyethylene, epoxy resin, phenoxy resin, and the like. Among these, polyamideimide, polyesterimide, and polyimide are preferable from the viewpoint of improving the heat resistance, chemical resistance, oil resistance, and the like of the lubricating insulated wire of the present invention. The resin used for the outermost layer of the insulating layer is selected from the group consisting of polyamideimide, polyesterimide, polyimide, polyamide, polyester, and polyurethane from the viewpoint of enhancing the adhesion between the insulating layer and the varnish of the lubricating insulated wire of the present invention. Preferably, at least one selected from the above is used. In order to improve the slipperiness of the insulated wire, the resin used for the outermost layer of the insulating layer may contain a lubricating component such as paraffins and wax. By using such a lubricating resin layer and a lubricant together, it is possible to further improve the slipperiness of the insulated wire.

  In the present invention, by using a fatty acid ester having an ester group in the molecule at room temperature as a lubricant, the slipperiness can be maintained even if the amount of the lubricating component added to the lubricating resin layer is reduced. In addition, an insulated wire that can achieve both adhesion to the varnish and slipperiness can be obtained.

  Further, the outermost layer of the insulating layer may be a self-bonding layer. When an insulated wire having a self-bonding layer is heated after coiling, the self-bonding layer is softened and the insulated wires can be fixed to each other by fusion between the fusion films. By using a fatty acid ester that has an ester group in the molecule and is liquid at room temperature for such an insulated wire, the surface slipperiness can be improved while maintaining the fixing force of the self-bonding layer. Suitable resins used for the self-bonding layer include, for example, thermosetting resins such as thermosetting polyamides, epoxy resins, phenoxy resins, and unsaturated polyesters, or thermoplastic resins.

  When manufacturing an insulated wire, resin which forms an insulating layer is normally used as a resin varnish. An insulated wire can be manufactured, for example, by applying a resin varnish to the surface of a conductor and baking it using a hot air circulating furnace.

  As a method of applying a lubricant containing a fatty acid ester to the surface of an insulated wire, for example, a tank containing a lubricant containing a fatty acid ester is impregnated with a part of the roll, and the roll is rotated while the roll is rotated. A method in which an insulated wire is brought into contact with an upper surface not impregnated with a lubricant containing a fatty acid ester, and the lubricating wire contains excess fatty acid ester after passing the insulated wire through a lubricant containing a fatty acid ester. Examples thereof include a method of removing the agent with felt and a method of passing an insulated wire over a felt impregnated with a lubricant containing a fatty acid ester. However, the present invention is not limited to such a method.

  The temperature of the lubricant containing the fatty acid ester when the lubricant containing the fatty acid ester is attached to the insulated wire is not particularly limited, and is usually about room temperature to 40 ° C. Moreover, the adhesion amount of the lubricant containing the fatty acid ester in the insulated wire is not particularly limited, and usually the amount by which the lubricant containing the fatty acid ester is uniformly adhered to the surface of the insulated wire is selected.

  Thus, the lubrication insulated wire of the present invention is obtained by applying the lubricant containing fatty acid ester on the surface of the insulated wire.

  Since the lubricating insulated wire of the present invention uses a fatty acid ester as a lubricant, it has excellent surface slipperiness. Therefore, for example, when a coil wound with the lubricating insulated wire of the present invention is inserted into the core of the status lot of the distributed winding motor, the dynamic friction coefficient between the coil and the core is small, so the coil is inserted into the core with a low insertion pressure. Therefore, there are advantages that the workability of insertion is improved and that the coil is not easily damaged by sliding when the coil is inserted into the core.

  Furthermore, the lubricating insulated wire of the present invention is also excellent in adhesion to a varnish used in, for example, a distributed winding motor. Therefore, the lubricating insulated wire of the present invention can be suitably used for a distributed winding motor in which a coil is inserted into the core of a status lot of the distributed winding motor and then subjected to a varnish impregnation treatment.

  Examples of the varnish used in the impregnation treatment at the time of manufacturing the distributed winding motor include polystyrene resins, epoxy resins, phenoxy resins, and the like, but the present invention is not limited to such examples. Further, the method for impregnating the varnish is not particularly limited, and a usual method can be employed.

  The motor of this invention has the coil which wound the said lubricous insulated wire. Therefore, the motor of the present invention is excellent in the reliability of the insulation performance because the insulation layer of the insulated wire is not easily damaged by the sliding when the coil is inserted into the core of the status lot at the time of manufacture. Furthermore, since the insulation between the insulated wire and the varnish is excellent, it can be suitably used for a compressor motor used in, for example, an air conditioner or a refrigerator.

  Next, the present invention will be described in more detail based on examples. However, the present invention is not limited to such examples.

Preparation Example 1
In a 1 L flask equipped with a thermometer, a cooling tube, a calcium chloride filled tube, a stirrer, and a nitrogen blowing tube, while flowing 150 mL of nitrogen gas from the nitrogen blowing tube per minute, 176.9 g of trimellitic anhydride, 1.95 g of trimellitic acid and 233.2 g of methylene diisocyanate (manufactured by Mitsui Takeda Chemical Co., Ltd., trade name: Cosmonate PH) were added.

  Next, 536 g of N-methyl-2-pyrrolidone was added to the flask as a solvent, heated for 3 hours at 80 ° C. while stirring with a stirrer, and then the temperature in the system was increased to 120 ° C. over about 4 hours. The temperature was raised and heated at the same temperature for 3 hours. Thereafter, the heating was stopped, 134 g of xylene was added to the flask to dilute the content liquid, and then allowed to cool to obtain a polyamideimide resin varnish (hereinafter referred to as general-purpose PAI) having a nonvolatile content of 35% by weight.

Preparation Example 2
By mixing the general-purpose PAI and polyethylene wax at a ratio of 1.5 parts by weight of polyethylene wax to 100 parts by weight of the solid content of the general-purpose PAI obtained in Preparation Example 1, a polyamide-imide resin varnish [hereinafter, highly lubricated PAI (1)] was obtained.

Preparation Example 3
By mixing general-purpose PAI and polyethylene wax at a ratio of 1.0 part by weight of polyethylene wax to 100 parts by weight of solid content of general-purpose PAI obtained in Preparation Example 1, a polyamide-imide resin varnish [hereinafter, highly lubricated PAI (2)].

Production Example 1 (Production of insulated wire A)
Using a hot air circulating furnace with a furnace temperature of 500 ° C., a mixed PAI (1) in which a highly lubricated PAI (1) and a general-purpose PAI were mixed at a weight ratio of 70:30 on a copper wire having a diameter of 1.0 mm was repeated several times. By applying and baking, an insulated wire (H-type insulation defined in JIS C 4003) having an insulating layer thickness of about 30 μm was manufactured. Hereinafter, the manufactured insulated wire is referred to as insulated wire A.

Production Example 2 (Production of insulated wire B)
In Production Example 1, instead of Mixed PAI (1), Mixed PAI (2) obtained by mixing highly lubricated PAI (1) and general-purpose PAI at a weight ratio of 50:50 was used. Similarly, an insulated wire was manufactured. Hereinafter, the manufactured insulated wire is referred to as insulated wire B.

Production Example 3 (Manufacture of insulated wire C)
In Production Example 1, an insulated wire was produced in the same manner as in Production Example 1, except that highly lubricated PAI (2) was used instead of mixed PAI (1). Hereinafter, the manufactured insulated wire is referred to as insulated wire C.

Production Example 4 (Production of insulated wire D)
In Production Example 1, an insulated wire was produced in the same manner as in Production Example 1 except that highly lubricated PAI (1) was used instead of mixed PAI (1). Hereinafter, the manufactured insulated wire is referred to as insulated wire D.

Example 1
Impregnating a lower part of a roll having a felt surface into a tank (liquid temperature: 25 ° C.) containing a fatty acid triester (in formula (I), wherein R ¹ is an ethyl group and R ² is a nonyl group); While rotating the roll, the insulated wire is brought into contact with the upper surface of the roll not impregnated with the fatty acid triester, and the fatty acid triester is applied to each surface of the insulated wires A to D obtained in Production Examples 1 to 4. It was applied evenly to produce a lubricated insulated wire.

Comparative Example 1
In Example 1, a lubricated insulated wire was produced in the same manner as in Example 1 except that liquid paraffin [manufactured by Nippon San Oil Co., Ltd., trade name: Sniso 4GS] was used instead of the fatty acid triester. .

  Next, the physical properties of the lubricating insulated wires obtained in Example 1 and Comparative Example 1 were examined by the following method.

(1) Static friction coefficient and dynamic friction coefficient (autograph method)
The coefficient of static friction and the coefficient of dynamic friction were used as indicators of the slipperiness of the lubricated insulated wire. Extend each of the four lubricated insulated wires by 1%, cross each lubricated insulated wire at right angles in a cross-beam shape, place a weight of 200g on the center, and determine the tensile strength with an autograph of a tensile tester. The average value was obtained by measuring three times, and this was used as the coefficient of friction. The static friction coefficient was determined by measuring the rising friction coefficient at the time of measuring the dynamic friction coefficient, and setting this as the static friction coefficient. Table 1 shows the measurement results of the static friction coefficient and the dynamic friction coefficient of the lubricated insulated wire.
In addition, AD in each table | surface shows the lubricated insulated wire AD in order, respectively.

  From the results shown in Table 1, the lubricated insulated wires obtained in Example 1 were all compared with the lubricated insulated wires in which conventional liquid paraffin was used (Comparative Example 1). From the fact that the coefficient of dynamic friction is very small, it can be seen that the sliding property of the surface is excellent.

  Therefore, the lubricated insulated wire obtained in Example 1 was compared with the lubricated insulated wire using the conventional liquid paraffin (Comparative Example 1), and the coil wound with the lubricated insulated wire was used as the motor status. Since the insertion pressure when inserting into the core of the lot is reduced, the workability during motor manufacturing is improved, and the insulating layer of the insulated wire is not damaged by the friction when inserting the coil into the core. It turns out that it is something to knock.

(2) Load at the time of inserting a coil When a coil wound with each of the lubricated insulated wires obtained in Example 1 and Comparative Example 1 is manufactured and inserted into the core of a status lot of a motor having a predetermined shape The required load was measured three times, and the average value was obtained. In addition, the space factor at the time of inserting a coil was 72%. The results are shown in Table 2.

  From the results shown in Table 2, all of the lubricated insulated wires obtained in Example 1 were compared with the lubricated insulated wires using conventional liquid paraffin (Comparative Example 1), when the coil was inserted. It can be seen that the load of is very small. Especially, since the lubrication insulated electric wire C uses highly lubricated PAI (2) as a varnish, it turns out that the load at the time of coil insertion is reduced significantly.

  Therefore, the lubricated insulated wire obtained in Example 1 is different from the conventional lubricated insulated wire (Comparative Example 1) in which liquid paraffin is used when the coil is inserted into the core of the status lot. It can be seen that since the insertion pressure is reduced, the workability is improved and the insulating layer of the insulated wire is not easily damaged by the friction when the coil is inserted into the core.

(3) Fixing force of varnish 30 samples of each of the lubricating insulated wires (length: 8 cm) obtained in Example 1 and Comparative Example 1 were bundled to prepare a sample. The obtained sample was mixed with a mixed resin of xylene and butyl cellosolve acetate (xylene / butyl cellosolve acetate (weight ratio)) to a phenol resin varnish at room temperature (manufactured by Altana Co., product number: PED923-50, solid concentration: 50% by weight). : 3/1] was added, and the solid content was adjusted to 12.5% by weight. After being immersed for about 5 minutes, the sample was taken out and heated in an atmosphere at 160 ° C. for 2 hours to heat-treat the sample. And cooled to room temperature.

  Next, this sample was set horizontally on a tensile tester, the maximum load when bending was measured, and the average value was obtained. The results are shown in Table 3.

  From the results shown in Table 3, all of the lubricated insulated wires obtained in Example 1 were compared with the lubricated insulated wires (Comparative Example 1) using liquid paraffin with strong varnish adhesion. Thus, it can be seen that the varnish has an inferior strength.

  Therefore, after inserting the coil which consists of a lubricous insulated wire in a core, since the varnish layer with strong adhering force can be formed in an insulated wire, it turns out that the reliability of a motor is improved.

Examples 2-4
In place of the fatty acid triester used in Example 1, a fatty acid ester A represented by the formula: C ₁₇ H ₃₃ COOC ₁₈ H ₃₅ (manufactured by Takemoto Yushi Co., Ltd., trade name: Pionin E-1717) (Example) 2), formula:

(In the formula, ^{three of} R ¹ , R ² , R ³ and R ⁴ represent a C ₁₇ H ₃₃ C (O) — group, and the other represents a hydrogen atom)
A fatty acid ester B [sorbitan trioleate, molecular weight: 958, manufactured by Takemoto Yushi Co., Ltd., trade name: Pionine D-935-T] (used in Example 3) or a formula: R ³ COOCH ₂ —CH ( OOCR ³ ) —CH ₂ (OOCR ³ ) (wherein R ³ represents a formula: C ₆ H ₁₃ CH (OH) CH ₂ CH═CHC ₇ H ₁₄ — group) (Examples) 4) and using the insulated wire B obtained in Production Example 2 as an insulated wire, a lubricated insulated wire was produced in the same manner as in Example 1.

  Next, the physical properties of the resulting lubricated insulated wire were examined in the same manner as in Example 1. The results are shown in Table 4. In Comparative Example 1, the measurement results of physical properties when using the insulated wire B are also shown in Table 4.

  From the results shown in Table 4, all of the lubricated insulated wires obtained in Examples 2 to 4 were compared with the conventional lubricated insulated wire using Comparative Liquid Paraffin (Comparative Example 1), and the static friction. Since the coefficient and the dynamic friction coefficient are very small, it can be seen that the surface is excellent in slipperiness. From this, the lubricated insulated wire obtained in Examples 2 to 4 is a coil in which the lubricated insulated wire is wound as compared with the lubricated insulated wire using the conventional liquid paraffin (Comparative Example 1). The insertion pressure when inserting the motor into the core of the motor status lot is reduced, so that the workability during motor manufacture is improved and the insulation layer of the insulated wire is formed by rubbing when the coil is inserted into the core. It turns out that it is hard to be damaged.

  In addition, all the lubricated insulated wires obtained in Examples 2 to 4 have a smaller load when inserting the coil as compared with the lubricated insulated wires using the conventional liquid paraffin (Comparative Example 1). I understand. Thus, the lubricated insulated wires obtained in Examples 2 to 4 were compared with the lubricated insulated wires in which conventional liquid paraffin was used (Comparative Example 1), and the coil was placed in the core of the status lot. Since the insertion pressure at the time of insertion is reduced, the workability is improved, and it can be seen that the insulating layer of the insulated wire is not easily damaged by sliding friction when the coil is inserted into the core.

  Furthermore, all of the lubricating insulated wires obtained in Examples 2 to 4 have a strong varnish fixing force as compared with the conventional lubricating insulated wires using liquid paraffin (Comparative Example 1). Recognize. From this, it can be seen that the reliability of the motor can be improved because a varnish layer having a strong adhering force can be formed on the insulated wire after the coil made of the lubricated insulated wire is inserted into the core.

  From the above results, it can be seen that the lubricated insulated wire of the present invention is excellent in surface slipperiness and also excellent in adhesion to varnish.

  Therefore, since the motor of the present invention has a coil wound with the above-mentioned lubricated insulated wire, the insulating layer of the insulated wire is damaged by rubbing when the coil is inserted into the core of the status lot during manufacture. Therefore, the reliability of the insulation performance is improved, and the adhesiveness between the insulated wire and the varnish is excellent.

  The embodiments disclosed above should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Claims (6)

A lubricating insulated wire formed by coating a lubricant on the insulated wire made of an insulating layer covering the conductor and conductor, together with the lubricant having three ester groups in the molecule, is liquid at room temperature fatty tri A lubricating insulated wire characterized by containing an ester. The fatty acid triester has the formula (I):
R ¹ —C (CH ₂ OOC—R ² ) ₃ (I)
(Wherein R ¹ represents an alkyl group having 1 to 4 carbon atoms, and R ² represents an alkyl group having 8 to 12 carbon atoms)
The lubricating insulated wire according to claim 1 , which is a fatty acid triester represented by: The lubricating insulated wire according to claim 2 , wherein in the fatty acid triester represented by the formula (I), R ¹ is an ethyl group and R ² is an alkyl group having 9 to 11 carbon atoms.   The lubricating insulated wire according to claim 1, wherein the outermost layer of the insulating layer contains at least one resin selected from the group consisting of polyamideimide, polyesterimide, polyimide, polyamide, polyester, and polyurethane.   The lubricated insulated wire according to claim 1, wherein the outermost layer of the insulating layer is a self-bonding layer. Motor having coils wound lubricating insulated wire according to any one of claims 1-5.