JPH0219599B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a heating coil for use in an electromagnetic cooker, and more specifically, a method for manufacturing a heating coil used in an electromagnetic cooker, and more specifically, a method for manufacturing a heating coil for use in an electromagnetic cooker. The present invention also relates to a method of manufacturing a heating coil used in an electromagnetic cooker.

(Prior art) A heating coil used in an electromagnetic cooker is generally made by winding a wire 3 made of stranded enamelled wire in a spiral shape and fixing it onto a coil support base 2 made of plastic, for example, by adhering it with impregnated varnish. (See Figure 9).

To manufacture this coil, the coil winding frame 1 is opposed to the coil support 2 and fixed to the shaft 4 of the coil winding machine. The most common method was to involve 3. This method required fewer processing steps and was a manufacturing method with good mass productivity.

(Problems to be Solved by the Invention) However, in heating coils made by conventional methods, the winding density is uniform and dense throughout. Therefore, when such a coil is used as a heating coil, the magnetic flux density becomes high at the intermediate portion between the inner diameter and the outer diameter of the coil, and the corresponding portion of the object to be heated, such as a pot, is heated significantly. This phenomenon causes uneven cooking, especially in grilled dishes.

In order to eliminate this uneven heating, a method has been developed in which the winding intervals of the coil are made sparse on the inside and dense on the outside (for example, Japanese Patent Application Laid-Open No. 56-56743). This requires a special wedge-shaped spacer, which increases costs, and furthermore, the spacer and wire are coiled at the same time, resulting in low productivity.

In view of the above, it is an object of the present invention to provide a highly productive manufacturing method that provides a gap near the middle of the coil windings.

(Means for Solving the Problems) That is, in the method of manufacturing a heating coil for an electromagnetic cooker according to the present invention, a flat coil support base 2 and a flat coil winding frame 1 are fixed to a coil winding machine main shaft 4 while facing each other, In the manufacturing method in which the coil 3 is wound in the coil winding notch 7 of the coil support between the coil support and the coil winding frame, the coil support and/or the coil winding frame are For the stand, the coil winding is placed near the middle between the outer and inner circumferences of the coil winding in the coil winding notch, and for the coil winding frame, the coil winding is placed in the coil winding notch in the coil support. A convex portion 8 is provided at a position corresponding to the middle between the outer circumference and the inner circumference of the coil winding, and this convex portion maintains a gap near the middle between the outer circumference and the inner circumference of the coil winding. It is something.

(Function) In the above case, as will be understood from the explanation of the drawings of the embodiments described below, the protrusion provided on the coil support and/or coil winding frame creates an opening near the middle between the outer circumference and the inner circumference of the coil winding. The gap can be maintained and its deformation can be prevented.

The manufacturing method of the present invention will be explained in detail below based on drawings of examples.

FIG. 1 shows a specific example of a coil support stand and a winding frame used in the manufacturing method of the present invention, and shows a notch 7 for coil winding in a flat coil support stand 2 such as a disk shape.
A convex portion 8 is provided near the middle between the outer periphery and the inner periphery. This convex portion 8 facilitates the formation of the gap G in the intermediate portion of the coil 3, as will be explained in FIGS. 3 and 4 below. FIG. 2 is a perspective view of the manufactured product.

Now, the coil winding process is as follows.

FIG. 3 shows a state in which the coil support stand 2 and the winding frame 1 are attached to the coil winding machine during coil winding work. FIG. 4 is a perspective view thereof (the winding frame 1 is not shown).

As the coil winding machine main shaft 4 rotates, the coil support 2 and the winding frame 1 also rotate, and the wire is wound into the winding notch 7 between the coil support and the winding frame, forming a spiral coil 3. It is formed. After a predetermined number of turns is completed, a plurality of spacers 6 arranged concentrically on the disk 5 on the main shaft of the coil winding machine are pushed out together with the disk 5 toward the coil side. Thereafter, when the coil winding machine is rotated again, the wire is wound around the spacer, and a spiral coil is formed on the outside of the spacer.
By such a method, it is possible to manufacture a coil in which a gap G is provided near the middle between the inner circumference and the outer circumference of the spiral coil.

The coil wound by the above manufacturing method includes the coil 3, the coil support 2, and the winding frame 1.
Generally, the coil is fixed with screws, etc., then removed from the coil winding machine, and then an adhesive such as impregnated varnish is applied to adhesively fix the coil and the coil support.

However, when the coil, coil support stand, and winding frame are removed from the coil winding machine, the spacer 6 to create a gap near the middle of the coil is removed at the same time.
is also removed through the gap between the coils. Therefore, during the post-process work, the cross line B in the gap part fluctuated as shown in Figure 5 (see arrow) due to the spring back of the wire itself, making it difficult to maintain a constant shape (Figure 5). (This phenomenon occurs when the winding frame is attached.) Therefore, as shown in Figures 1 and 2, if a protrusion 8 is provided on the coil support stand so as to be in contact with the outer periphery of the gap, this protrusion can prevent the wire from fluctuating due to springback. , it becomes possible to mass produce coils with gaps in a fixed shape.

In addition, in the above, the protrusion 8 is provided on the coil support base.
However, as shown in FIG. 7, the coil winding frame 1 is provided with a convex portion 8, or as shown in FIG. A similar effect can be obtained by Note that 3 in Figures 7 and 8 is a coil.

Furthermore, in Fig. 1, a plurality of convex portions are attached to the coil support base, but the effect can be achieved even if the convex portion is provided at one location at the root of the crossover line (the effect of maintaining the gap shape is greater when there are multiple convex portions). In the example, a spacer is used to create a gap, but the gap can also be created in the same way without using a spacer by changing the back tension applied to the wire on the supply side.

That is, when winding the coil, the back tension is strengthened at the beginning of the winding, so that the stranded wire is deformed, passes inside the convex portion, comes into close contact with the center of the coil support, and winds a spiral coil. If the back tension is weakened midway through, the stranded wires will deform and will no longer be able to cross over the convex portion and pass inward.After that, the stranded wires will be guided outward along the convex portions of the coil support and/or the coil winding frame to the designated outside. It is wound up to the diameter. Also, the back tension is changed during winding.

FIG. 6 shows the temperature distribution of the coil for an electromagnetic cooker obtained in the example of the present invention, where 9 is the temperature distribution of the conventional coil, 10 is the temperature distribution of the coil according to the present invention, and 10 is the temperature distribution of the coil according to the present invention. The coil for an electromagnetic cooker with a gap manufactured by the manufacturing method shown in FIG. 1 has a significantly uniform temperature distribution and is excellent.

(Effects of the Invention) The method of manufacturing a coil for an electromagnetic sulfur regulator of the present invention as described above has the following effects. By using a coil support stand and/or a coil winding frame provided with a convex portion, a gap can be maintained near the middle between the outer circumference and the inner circumference of the winding, and deformation thereof can be prevented. Further, it is possible to easily manufacture a coil for an electromagnetic cooker in which the shape of the gap provided between the inner circumference and the outer circumference of the coil is constant.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the coil for an electromagnetic cooker of the present invention, Fig. 2 is a perspective view of the coil of Fig. 1, Fig. 3 is a sectional view of the coil of Fig. 1 during coil winding work, and Fig. 4 is a sectional view of the coil for an electromagnetic cooker of the present invention. FIG. 5 is a diagram illustrating the deformation of the coil when no convex portion is provided on the coil support, and FIG. 6 is a diagram illustrating the features of the coil for an electromagnetic cooker obtained by the manufacturing method of the present invention. , Fig. 7 is a cross-sectional view of the case where the convex part is provided on the coil winding frame, Fig. 8 is a cross-sectional view of the case where the convex part is provided on both the coil support stand and the coil winding frame, and Fig. 9 is a sectional view of the case where the convex part is provided on both the coil support stand and the coil winding frame. A cross-sectional view of each is shown as an example. 1... Coil winding frame, 2... Coil support stand, 3...
... Coil, 4 ... Coil winding machine main shaft, 5 ... Disc,
6...Spacer, 7...Notch, 8...Protrusion, G...Gap, B...Spanning line.

Claims (1)

[Claims] 1. Flat coil support 2 and flat coil winding frame 1
In the manufacturing method, the coil 3 is fixed to the coil winding machine main shaft 4 facing each other, and the coil 3 is wound in the coil winding notch 7 of the coil support between the coil support and the coil winding frame. On the coil support stand and/or coil winding frame, in the case of the coil support stand, place the coil at a position near the middle between the outer circumference and the inner circumference of the coil winding in the above-mentioned coil winding notch, and in the case of the coil winding frame, the coil A protrusion 8 is provided at a position corresponding to the middle between the outer circumference and the inner circumference of the coil winding in the coil winding notch of the support base. A method for manufacturing a heating coil for an electromagnetic cooker, characterized in that a gap is maintained near the middle of the heating coil. 2 Using a coil support stand and/or a coil winding frame with a convex part, start winding the coil from the inner circumferential side inside the convex part, and rotate in synchronization with the main shaft of the coil winding machine in the middle of winding. Insert the spacer 6 at the same radial position as the convex portion of the coil support and/or the coil winding frame and in a direction perpendicular to the coil support and the coil winding frame, and insert the spacer 6 for subsequent windings. and/or wind the coil along the outside of the convex part of the coil winding frame to a predetermined winding outer circumference;
2. The method of manufacturing a heating coil for an electromagnetic cooker according to claim 1, wherein a gap is provided near the middle between the outer periphery and the inner periphery of the coil winding, and this gap is maintained by the convex portion. 3 Using a coil support stand and/or a coil winding frame with a convex part, start winding the coil from the inner circumferential side inside the convex part, weaken the back tension in the middle of winding, and then Claim 1: The coil is wound along the outside to a predetermined outer circumference of the coil, a gap is provided near the middle between the outer circumference and the inner circumference of the coil winding, and this gap is maintained by the protrusion. The method for manufacturing the heating coil for an electromagnetic cooker as described above. 4. The method for manufacturing a heating coil for an electromagnetic cooker according to claim 1, wherein the flat coil support is a disk coil support.