JP2003151819A - Waterproof coil and method of forming waterproofing insulating layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof coil using a waterproofing insulating layer that has a fixed thin thickness and can be manufactured inexpensively. SOLUTION: This waterproof coil 1 is constituted by coating the whole surface of a coil 2 with the waterproofing insulating layer composed of a thin urethane resin film 3 having a softening temperature lower than the heat- resisting temperature of the insulating coating film of the coil 2 and higher than an ordinary temperature and a waterproofing property. Then the lead-out wire 5 of this coil 1 is led out through a lead-out wire holder 4 fixed to the thin urethane resin film 3. Since the waterproof coil 1 is thus constituted, the external form of the coil 1 becomes compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof coil and a method for forming a waterproof insulating layer used in a linear motor or the like, and more particularly to a method for forming a waterproof coil and a waterproof insulating layer which are required to have insulation and waterproof properties.

[0002]

2. Description of the Related Art For example, a coil incorporated in a linear motor or the like is used at room temperature, and in order to efficiently increase the thrust of the linear motor, it is necessary to increase the amount of current supplied to the coil. Desired. When the amount of heat generated by the coil increases due to an increase in the amount of current, a method of cooling the coil is adopted as a measure for suppressing the temperature rise of the coil. The coil is formed by winding an insulating coating wire, and Fluorinert is used as a non-conductive medium for cooling that does not deteriorate the insulating property of the coil even if the insulating coating (silicon) is directly touched. This Fluorinert is superior to the water cooling method in terms of the cooling effect and is advantageous in that it is an insulating medium.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention In the coil used by being incorporated in the above-mentioned conventional linear motor or the like,
Fluorinert is used as a cooling medium for cooling the coil in order to increase the amount of current flowing through the coil and improve thrust, etc. It is one of the factors that cause environmental damage by reducing ozone in the area.

As a cooling medium replacing Fluorinert, there is a method called water cooling in which water is used as a natural medium that does not adversely affect the natural environment. However, water is electrically conductive, and a minute pin is used as an insulating coating for coil conductors. Because there is a hall,
It is necessary to improve the insulation of the coil. Therefore, a waterproof coil in which the entire coil is covered with a waterproof insulating layer is required.
However, in order to conduct well the heat generated by the coil,
It has not been possible to realize a waterproof coil that is thin, has a constant thickness, and can be manufactured at low cost.

An object of the present invention is to provide a waterproof coil and a method for forming a waterproof insulating layer which are thin and have a constant thickness and which can be manufactured at low cost.

[0006]

In order to solve the above problems, the present invention provides the following means.

(1) In a waterproof coil obtained by coating a coil of an insulating coated wire with a waterproof insulating layer, the insulating layer is softened at a temperature lower than the heat resistant temperature of the insulating coating of the coil and higher than room temperature. The waterproof coil is made of insulating sheets that adhere to each other.

(2) The waterproof coil according to item (1), wherein the insulating layer is made of urethane resin.

(3) In a method of forming a waterproof insulating layer that adheres closely to a coil of an insulating coated wire and covers the coil to prevent water from touching the coil, the temperature is lower than the heat resistant temperature of the insulating coating of the coil, and A first step of winding an insulating sheet made of a waterproof material, which is softened at a temperature higher than room temperature and which adheres to each other in the softened state, around the coil and covers the entire surface of the coil with the insulating sheet; A second step of accommodating the coil covered with the insulating sheet in a molding jig for molding the outer shape of the insulating sheet, and accommodating the molding jig in a decompression container, The third step of decompressing the internal space and exhausting the air in the molding jig to the outside, and placing the decompression container containing the molding jig in a heating and pressurizing container, together with the decompression container, the molding jig Add And a fourth step of softening the insulating sheet, and a waterproof property of covering the entire surface of the coil by pressurizing the inner space of the heating / pressurizing container and bringing the insulating sheet into close contact with the surface of the coil. A fifth step of forming an insulating layer, the method comprising the step of forming a waterproof insulating layer.

(4) In step 4, when bubbles are generated from the softened insulating sheet, the bubbles are depressurized in the internal space of the decompression container and the bubbles are extracted from the insulating sheet. The method for forming a waterproof insulating layer according to (3) above.

(5) The method for forming a waterproof insulating layer according to item (3) or (4), wherein the insulating sheet is made of urethane resin.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described more specifically with reference to the embodiments of the present invention. The waterproof insulating layer that covers the surface of the waterproof coil that is the embodiment of the present invention,
The softening temperature is lower than the heat resistant temperature of the insulating coating of the coil and higher than normal temperature, and is formed by a thin film layer of a waterproof material. With this configuration, the cooling effect of the waterproof coil is improved, and the efficiency of the motor incorporating the waterproof coil is improved.

The structure of the waterproof coil according to one embodiment of the present invention will be described below with reference to the drawings. Figure 1
FIG. 1 (a) is an external view showing the structure of the waterproof coil.
Is a plan view, and FIG. 1B is A in the plan view of FIG.
FIG. 3 is a cross-sectional view taken along arrow A. This waterproof coil is applied to a linear motor. The coil 2 is formed by winding a conductive wire coated with silicon or the like (insulating coated conductive wire) many times. As shown in FIG. 1, in the waterproof coil 1, a urethane resin thin film 3 is used as a waterproof insulating layer that covers the coil 2. The urethane resin thin film 3 has a softening temperature of the coil 2
Lower than the heat resistant temperature of the insulation coating and higher than room temperature,
It is also excellent in waterproofness. The lead wire 5 of the winding of the coil 2 is drawn to the outside through a lead wire holder 4 fixed to the urethane resin thin film 3.

Next, a method of forming the waterproof insulating layer according to the embodiment of the present invention will be described. In the present embodiment, a waterproof insulating sheet is wound on the surface of the coil, the coil housed in a predetermined molding jig is heated to soften the insulating sheet, and this is softened by pressing. The insulating sheet is brought into close contact with the coil surface to form a waterproof insulating layer.

FIG. 2 shows a coil 2 according to the present embodiment.
FIG. 4 is a view showing a flow chart of a procedure for forming the urethane resin thin film 3 as a waterproof insulating layer on the above, and FIG. 3 is a sectional conceptual view of the waterproof coil in each manufacturing process when the urethane resin thin film 3 is formed. In FIG. 2, first in FIG.
As shown in (a), the urethane resin sheet 6 is wound around the surface of the coil 2 (step S21). Figure 3 (a)
Then, when the urethane resin sheet 6 is wound around the surface of the coil 2, a slight gap 13 formed between the coil 2 and the urethane resin sheet 6 is schematically shown. The coil 2 around which the urethane resin sheet 6 is wound is housed inside a molding jig 7 for forming the outer shape of the waterproof coil (also the outer shape of the waterproof insulating layer), as shown in FIG. 3B. (Step S22). At this time, the coil 2 wound with the urethane resin sheet 6 is set at a predetermined position of the molding jig 7 by the positioning spacer 8. The molding jig 7 is composed of a molding jig body portion 7a and a molding jig lid portion 7b. Next, as shown in FIG. 3C, the coil 2 set on the molding jig 7 is attached to the pressure reducing sheet container 9 made of heat-resistant resin.
The air inside the molding jig 7 is exhausted to the outside through the vacuum decompression action of the decompression sheet container 9 (step S23). Reference numeral 9a indicates the mouth of the decompression sheet container 9. Next, as shown in FIG. 3 (d), the molding jig 7 containing the coil 2 is inserted into the depressurization sheet container 9 and the inside of the heating / pressurizing container 10 (pressurizing oven). Is heated to soften the urethane resin sheet 6 (step S24). Reference numeral 12 indicates a table on which the decompression sheet container 9 is placed. next,
After confirming that air bubbles come out from the softened urethane resin sheet 6, the air is removed through the vacuum pressure reducing action of the pressure reducing sheet container 9 (step S25). Reference numeral 11 indicates a tube for venting air, which is connected to the opening 9a of the pressure reducing sheet container. After defoaming, the pressure in the internal space of the heating / pressurizing container 10 is increased, the depressurizing sheet container 9 is contracted, and the softened urethane resin sheet 6 on the surface of the coil 2 is pressed, so that the urethane resin sheet 6 is coiled. The urethane resin thin film 3 is formed as a waterproof insulating layer on the winding of the coil 2 by closely contacting it with the surface of the coil 2 (step S26). The urethane resin sheet 6 adhered to the surface of the coil 2 returns the internal temperature of the heating / pressurizing container 10 to room temperature, or removes the depressurizing sheet container 9 from the heating / pressurizing container 10 to the atmosphere and returns it to room temperature. Harden. At this time, the void 13 in FIG.
Disappears, the urethane resin sheet 6 comes into close contact with the surface of the coil 2, and as shown in FIG.
Becomes Thus, the waterproof coil 1 shown in FIG. 1 was produced by the method of the procedure of FIG.

In step S25, if bubbles have not come out from the softened urethane resin sheet 6, it is not necessary to remove bubbles.

As described above, the urethane resin sheet 6 having a softening temperature lower than the heat resistant temperature of the coil 2 and having a waterproof property is wound around the entire surface of the coil 2, and a predetermined forming jig 7 is formed.
It is housed and set inside, and the urethane resin sheet 6 is heated to be softened, and the softened urethane resin sheet 6 is pressed to be tightly adhered to the winding of the coil 2 so that the thickness is about 0.5 mm. The urethane resin thin film 3 is formed as a stable waterproof insulating layer having a high withstand voltage and no bubbles in the insulating layer. The urethane resin thin film 3 is thin, has excellent thermal conductivity, has a constant thickness, and has stable quality. A large-scale apparatus is not required for forming the urethane resin thin film 3 and the manufacturing process of the urethane resin thin film 3 is simple. Therefore, the waterproof coil can be manufactured at low cost by this method. The waterproof coil 1 coated with the urethane resin thin film 3 in this manner is placed in cooling water, and by utilizing the cooling effect, it is possible to contribute to the improvement of the working efficiency of the incorporated motor. .

[0018]

As described above, according to the present invention,
It is possible to provide a method for forming a waterproof coil and a waterproof insulating layer which are thin and have a constant thickness and can be manufactured at low cost. If the present invention is applied to a coil used by being incorporated in a motor or the like,
A waterproof coil in which bubbles are eliminated and a stable thin film waterproof insulating layer is formed on the surface of the coil can be easily obtained, and the cooling effect obtained by placing this waterproof coil in cooling water impairs the natural environment. It is possible to improve the actual working efficiency of the motor and the like.

[Brief description of drawings]

FIG. 1 is an external view showing a structure of an embodiment of a waterproof coil of the present invention.

FIG. 2 is a diagram showing a flowchart of a method for forming a waterproof insulating layer of the present invention.

[FIG. 3] In each manufacturing process for forming a waterproof insulating layer,
It is a cross-sectional conceptual diagram which shows the form of a waterproof coil.

[Explanation of symbols]

1 waterproof coil 2 coils 3 Urethane resin thin film 4 Lead wire holder 5 Leader line 6 Urethane resin sheet 7 Molding jig 7a Molding jig body 7b Molding jig lid 8 Positioning spacer 9 Decompression sheet container 9a Decompression sheet container mouth 10 Heat and pressure container 11 tubes 12 units 13 void

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 15/12 H02K 15/12 C 41/02 41/02 AZ (72) Inventor Takashi Nakahara Shibuya, Tokyo 1-21-21 Dogenzaka Ward, Nihon Aviation Electronics Industry Limited (72) Inventor Minoru Tanaka 1-21-2 Dogenzaka, Shibuya-ku, Tokyo Nihon Aviation Electronics Industry Co., Ltd. F-term (reference) 5E044 CA02 CA03 CB03 5H604 BB01 BB11 CC04 CC20 DA23 DA25 DB03 DB26 PE01 PE06 5H615 AA01 BB01 PP17 QQ02 RR02 SS03 SS15 SS24 TT26 TT32 5H641 GG07 GG11 GG12 JB05

Claims (5)

[Claims] 1. A waterproof coil obtained by coating a coil of an insulating coated wire with a waterproof insulating layer, wherein the insulating layer is softened at a temperature lower than the heat resistant temperature of the insulating coating of the coil and higher than room temperature. , A waterproof coil, which is made of insulating sheets that adhere to each other. 2. The waterproof coil according to claim 1, wherein the insulating layer is made of urethane resin. 3. A method for forming a waterproof insulating layer, which is in close contact with a coil of an insulation-coated conductor and covers the coil to prevent water from touching the coil, wherein the temperature is lower than a heat-resistant temperature of the insulation coating of the coil and at room temperature. A first step of winding an insulating sheet made of a waterproof material, which is softened at a higher temperature and adheres to each other in a softened state, around the coil, and covers the entire surface of the coil with the insulating sheet; A second step of accommodating the sheet-covered coil in a molding jig for molding the outer shape of the insulating sheet; and accommodating the molding jig in a decompression container, the inside of the decompression container. The third step of decompressing the space and exhausting the air in the molding jig to the outside, and putting the decompression container accommodating the molding jig into a heating / pressurizing container, and forming the molding jig together with the decompression container. Heating A fourth step of softening the insulating sheet, and a waterproof insulation covering the entire surface of the coil by pressurizing the inner space of the heating and pressurizing container to bring the insulating sheet into close contact with the surface of the coil. A fifth step of forming a layer, and a method of forming a waterproof insulating layer, comprising: 4. In the step 4, when bubbles are generated from the softened insulating sheet, the bubbles are depressurized in the internal space of the decompression container, and the bubbles are extracted from the insulating sheet. Item 4. A method for forming a waterproof insulating layer according to Item 3. 5. The method for forming a waterproof insulating layer according to claim 3, wherein the insulating sheet is made of urethane resin.