JPS60206113A - Coil for electromagnet - Google Patents

Abstract

PURPOSE:To obtain the titled coil having a coated layer on which cracks and breakages are hardly generated even when temperature and surroundings are changed by a method wherein a coil winding is provided on the outer circumference of a coil bobbin, and a plurality of resin-coated layers are formed on the coil to be used for an electromagnet whereon the outer circumference of the coil winding is coated by resin. CONSTITUTION:The outer circumference of a coil winding 3 is insulated using a resin layer 4. The resin coated layer consists of a plurality (two layers) of layers 41 and 42. In order to form a coated layer, the material whereon a coil winding is performed on the outer circumference of a coil bobbin 2 is supported by a pair if rotary shafts 11 and 12 held by a frame 10, and the above is rotated at the prescribed speed using a motor 13. Then, a prescribed quantity of liquid resin material is pushed out toward the outer circumference of the coil winding from a coating device 14, it is uniformly coated thereon and subsequently, the coil is moved to a hardening device together with the frame, the resin is hardened, and the first layer of a coated layer 41 is formed. Then, the second layer of a coated layer 42 is formed in the same manner as above.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electromagnetic coil in which the outer periphery of a coil winding is coated with a plurality of layers of resin material.

(b) Prior Art As a material for insulating the outer periphery of an electromagnet coil, a resin material is excellent due to its characteristics. For this reason, it has been conventionally practiced to insulate only the outer periphery of the coil winding or the outer periphery of the coil winding and the coil bobbin with a resin material.

However, as shown in Fig. 1, in the conventional coil, there was only one layer of resin coating layer C around the coil winding formed around the outer periphery of the coil bobbin a, so the temperature may increase due to the use of an electromagnet or due to the surrounding environment. There was a problem that the coating layer of the resin material could be cracked or damaged due to the change. Furthermore, in the environment in which a solenoid valve using an electromagnet is used, there is a risk that it may be scratched or cracked by an external impact, leading to electrical leakage.

One possible way to prevent this is to cover it with a metal case, but there are problems with insulation between the coil and the metal case, and there is an air gap created around the inner circumference of the metal case due to the structure. However, although the coating was formed by resin molding, there were still problems with temperature changes, the environment, shrinkage due to the temperature of the coil wire, and the heat radiation of the resin itself. .

(c) Purpose of the Invention The present invention has been developed in view of the problems of conventional coils, and its purpose is to have a covering layer that is resistant to cracking and damage even in the temperature change environment. The point is to get the coil.

B) Structure of the Invention The present invention is an electromagnetic coil in which a coil winding is provided on the outer periphery of a coil bobbin, and at least the outer periphery of the coil winding is coated with a resin material, and is configured with a plurality of coating layers of the resin material. .

(E) Embodiments Hereinafter, embodiments of the electromagnetic coil according to the present invention will be described with reference to the drawings.

In FIG. 2, an electromagnetic coil 1 according to a Jth embodiment is shown. In the figure, 2 is a coil bobbin in which a body 21 and flanges 22 at both ends are integrally formed, and 3 is a coil winding formed by winding a coil wire around the outer periphery of the body 21.

The outer periphery of the coil winding 3 is insulated with a layer 4 of resin material. There are a plurality of resin coating layers (two layers in this example)41.
It's now 42. The resin shells forming the plurality of coating layers may have the same properties, but preferably have temperature resistance properties,
Insulating properties.

It is better to use materials that have different properties.

In order to form the plurality of coating layers, for example, as shown in FIG.
12 and rotated by a motor 13 at a predetermined speed. The coating device 14 also pushes out a predetermined amount of liquid resin material toward the outer periphery of the coil winding and uniformly coats it there.
Thereafter, while the coil itself is being rotated, the entire frame is moved to the next curing device and cured, thereby forming the first coating layer 41. Thereafter, in the same manner as described above, the second coating layer 42 is
form.

If it is desired to further form a third or higher coating layer, the same steps may be repeated.

Another embodiment 1 of the electromagnetic coil of the present invention is shown in FIG.
a is shown. In this embodiment, a counterbore 23a is formed on the inner side, that is, on the body side, of the outer periphery of the flange 22a of the coil bobbin 2α, and the counterbore is simultaneously covered with coating layers 414 and 42a. The position of the bottom surface 24α of the counterbore portion 23a is preferably formed at approximately the same radial position (centered on the axis of the coil) as the position of the outer periphery of the coil winding 3.

The bottom surface 24a of the counterbore 23a is formed of two conical surfaces centered on the central axis of the coil, such that the beheads form two straight lines that intersect diagonally. Molding of the coating layer of the coil in this embodiment. This can also be done by the same molding method as in the previous embodiment.

(to) Effect According to the present invention, the following effects can be achieved.

(1) Since the coating layer is multilayered, it can be made strong against cracks, etc.

(11) Furthermore, by making the plurality of covering layers different from each other, for example, the first layer can be made to have a rubbery property and damage can be prevented.

011) Since it is applied while rotating, it can be applied thinly and uniformly, and even if the coating layer is made of multiple layers, the overall thickness can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional electromagnetic coil, FIG. 2 is a cross-sectional view of an embodiment of the electromagnetic coil according to the present invention, and FIG. 3 is a cross-sectional view of a second coating layer of the electromagnetic coil according to the present invention. FIG. 4, a diagram illustrating the method, is a cross-sectional view of another embodiment of a coil according to the invention. 1.14: Coil 2.2a: Coil bobbin 3.3. Z: Coil winding 41.41a+ 42.42a: Covering layer #l Figure a Hata 2 Figure 3 Figure 2/a

Claims (1)

[Claims] J. An electromagnet coil in which a coil winding is provided on the outer periphery of a coil bobbin, and at least the outer periphery of the coil winding is covered with a resin material, and the electromagnet has a plurality of coating layers of the resin material. 2. The electromagnetic coil according to claim 1, wherein the plurality of coating layers are formed of resin materials having mutually different properties. 3. A counterbore is formed inside the outer periphery of the flange of the coil bobbin, and the counterbore is also covered with a layer of resin material along with the outer periphery of the coil winding.
Coil for electromagnet described in.