JP2003115368A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease coil resistance to the high frequency current of heating coil by lessening influence of the outer skin effect and the proximity action. SOLUTION: In what carries out induction heating of a heated body by passing high frequency current in the heating coil, which is constituted by winding the coil conductor wires, a rightly twisted assembled wire 6 and a lefty twisted assembled wire 7 are formed using two or more strands or assembled wires of the coil wires in a 1st stage, the assembled wire 8 of a 2nd stage is formed by bundling 3 bundles of the rightly twisted assembled wire 6 and 4 bundles of lefty twisted assembled wire 7 in the 2nd stage, and further, it is made to have multi-stage piling twist structure, which makes 5 bundles of the assembled wire 8 of the 2nd stage bundle to be the assembled wire 9 of a 3rd stage. Since directions of the high frequency current become irregular even if many fine wires are used in order to prevent the outer skin effect, the heating coil using this coil wires of this structure can reduce the influence of the proximity action, and can decrease the coil resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker, and more particularly, to a coil wire used for a heating coil for passing a high frequency current.

[0002]

2. Description of the Related Art Conventionally, an iron pot having a high magnetic permeability has been used as a pot used for an induction heating cooker. However, in recent years, there has been an increasing demand to use copper pans and aluminum pans in addition to iron pans. By the way, in order to induction-heat a copper pan or an aluminum pan, the magnetic permeability is low, which is suitable for an iron pan and is about 40 to about 100 kHz higher than about 20 to about 30 kHz.
A high frequency current of z must be passed through the heating coil.
However, as the frequency increases, the effective resistance increases remarkably because the high frequency current flows only near the surface of the conductor due to the so-called skin effect. Therefore, as a method of increasing the surface area and effectively reducing the resistance, a method of making the diameter of the conductive wire thin and bundling several to several tens of copper wires having a diameter of 0.1 mm has been used. However, in this method, although the effective resistance due to the skin effect can be reduced, the resistance cannot always be sufficiently reduced due to the proximity action because a large number of conducting wires are used. The proximity action mentioned here is a phenomenon in which, when currents flow in adjacent conductors, they influence each other via a magnetic field to cause a bias in the current distribution, which effectively increases the resistance of the conductor surface. The proximity effect becomes greater as the directions of the high-frequency current are aligned between the conductors and the spacing between the conductors is smaller.

As a method for solving the above problems, for example, there is a method described in Japanese Examined Patent Publication No. 7-118377. According to the publication, the coil conducting wire of the heating coil has a multi-stage assembly structure in which the assembly wires in which the element wires are bundled are further assembled, and at least one assembly wire is formed by braiding, so that the orientation of the assembly wire is In addition to being non-uniform, they are not in close contact with each other, which can suppress the proximity effect and reduce the coil resistance of the heating coil with respect to the high-frequency current.

[0004]

However, in the above-mentioned conventional structure, the coil resistance of the heating coil with respect to the high-frequency current can be reduced, but in order to further improve the efficiency of induction heating, the coil resistance is further reduced. Had to do.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide an induction heating cooker in which the effects of the skin effect and the proximity effect are reduced and the coil resistance of the heating coil to high-frequency current is reduced. And

[0006]

In order to solve the above-mentioned conventional problems, the induction heating cooker of the present invention is provided with a heating coil composed of an assembly wire in which a right-handed twisted assembly wire and a left-handed twisted assembly wire are mixed. And With this configuration, even if a large number of thin wires are used to reduce the influence of the skin effect, the influence of the proximity action can be reduced. That is, since the heating coil of the present invention is wound around the assembly wire, the bending radii are different between the inner wire and the outer wire, so that the directions of the currents are not uniform, and further,
Since the directions of the electric currents of the right-handed twisted assembly wire and the left-handed twisted assembly wire are uneven, the current becomes more uneven and the proximity effect can be reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 is provided with a heating coil composed of a wire assembly in which a right-handed twisted assembly wire and a left-handed twisted assembly wire are mixed. Thereby, even if a large number of thin lines are used to reduce the influence of the skin effect, the influence of the proximity effect can be reduced. That is, since the heating coil of the present invention is wound around the assembly wire, the bending radii are different between the inner wire and the outer wire, so that the directions of the currents are uneven,
Furthermore, the directions of the electric currents of the right-handed twisted assembly wire and the left-handed twisted assembly wire are not uniform, so that they are more uneven. Therefore, the heating coil using this coil conductor prevents an increase in coil resistance due to the effects of skin effect and proximity effect,
The efficiency of induction heating can be improved.

According to a second aspect of the present invention, in which a high frequency current is passed through a heating coil formed by winding a coil conductor to inductively heat an object to be heated, the coil conductor uses a plurality of strands or aggregates. By forming a right-handed twisted assembly line and a left-handed twisted bundled wire, and using at least one bundle of the right-handed twisted bundled wire and the left-handed twisted bundled wire, respectively By the same operation as that described in claim 1, it is possible to reduce the influence of the skin effect and the proximity effect, and to provide a heating coil with high efficiency of induction heating.

According to the third aspect of the present invention, the coil wire has a configuration in which the same number of right-handed twisted wires and left-handed twisted twisted wires are used for at least one step of twisting. It can be further reduced.

According to a fourth aspect of the present invention, the coil conductor is a heating coil using a bundled wire in which a bundle of right-handed strands and a bundle of left-handed strands are twisted in at least one stage of twisting in advance. With this structure, the portions where the directions of current flow are not uniform can be provided uniformly.

According to a fifth aspect of the present invention, a high-frequency current is passed through a heating coil formed by winding a coil conductor to inductively heat an object to be heated, wherein the coil conductor is a plurality of strands or bundled wires. Then, two or more kinds of aggregated wires having different twist pitch dimensions are formed, and at least a plurality of aggregated wires having different twist pitch dimensions are used to form a multi-stage lap twist structure composed of a superordinate aggregated wire. Since the bending degree of the strands differs depending on the twist pitch, when strands having different pitches are gathered, the directions of the currents of the strands are different. Therefore, the directions of the electric currents are not uniform, and the influence of the proximity action is small. Therefore, when a heating coil is manufactured using this coil conductor, the efficiency of induction heating is improved.

According to the invention of claim 6, since the coil conductors are configured such that the ratio of different pitch dimensions is not an integral multiple, the same state is not repeated even when the aggregated wire is used. The directions of the currents in the portions are also uneven, and the influence of the proximity action can be further reduced.

According to a seventh aspect of the present invention, in which a high frequency current is passed through the heating coil to inductively heat the object to be heated, the heating coil is formed by winding strands or aggregated wires at an irregular pitch. With this configuration, even if the wound coil conductors come into contact with each other, the direction of the current in those parts is uneven, so it is possible to reduce the effects of proximity effects and improve the induction heating efficiency of the heating coil. Can be made.

According to an eighth aspect of the present invention, in which a high frequency current is passed through a heating coil formed by winding a coil conductor to inductively heat an object to be heated, the coil conductor uses a plurality of strands or aggregates. It is possible to reduce the influence of proximity action by adopting the configuration of the assembly line formed by mixing the right-handed circular-tube-shaped spiral portion of the right-handed spiral and the left-handed circular-tube-shaped portion of the left-handed spiral. .

According to a ninth aspect of the present invention, the coil wire is formed by separately dividing the right spiral portion and the left spiral portion, and the other spiral portion is provided close to the inside of one of the spiral portions. By reducing the influence of proximity action, the distance between the object to be heated and the right spiral part becomes equal to the distance between the object to be heated and the left spiral part, and the current flowing in the right spiral part and the left spiral part By reducing the bias of (1), the loss of the heating coil is reduced.

According to the tenth aspect of the present invention, the coil conductor is configured such that the inner and outer relations of the circular spiral right spiral portion and the left spiral portion are alternately switched every time the strand wire or the assembly wire intersects. The influence of the proximity effect can be reduced, and the current flowing through the right spiral portion and the left spiral portion becomes the same, so that the loss of the heating coil is reduced.

In the eleventh aspect of the present invention, the coil conducting wire is configured such that the inner and outer relationships of the circular spiral right spiral portion and the left spiral portion are exchanged at predetermined intervals, thereby reducing the influence of proximity action. In addition to being able to obtain the effect of claim 10, in the manufacture of this coil, the work of exchanging the right spiral part and the left spiral part is facilitated, the productivity is improved, and the cost is reduced.

According to the twelfth aspect of the present invention, the heating is performed with a heating coil in which a coil wire having a circular tubular spiral portion is pressed and wound in a flat shape to reduce the influence of proximity action. The coil can be miniaturized.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) The feature of this embodiment is that when a stranded wire is prepared by using a plurality of strands or assembled wires, the assembled wire is formed by mixing right stranded wires and left stranded wires. It is a point. In this configuration, the current of the right twisted wire flows slowly while rotating to the right, and the current of the left twisted wire flows while slowly rotating to the left. Therefore, since the directions of the currents are different, that is, the directions of the currents do not match and become uneven, it is possible to prevent an increase in resistance due to the proximity action. The term "slowly" means that the coil is stretched. This will be described below with reference to the drawings. First,
A schematic configuration of the induction heating cooker will be described with reference to FIG. Reference numeral 1 is a main body that constitutes the outer shell of an induction heating cooker, 2 is a top plate provided on the main body 1, 3 is a heating coil manufactured by using the coil conductor wire according to the present invention, and 4 is a control unit that controls the heating coil 3. 5 is an object to be heated placed on the heating portion provided on the top plate 2 corresponding to the heating coil 3. In this configuration, when a high-frequency current is passed through the heating coil 3, a magnetic flux is generated, and the object 5 to be heated is heated by the heat generated by the eddy current loss of the magnetic flux.

The structure of the coil conductor in this embodiment will be described below with reference to FIG. It should be noted that, in this embodiment, about 4 which is suitable for induction heating a copper pan or an aluminum pan.
It is premised that a high frequency current of 0 kHz to about 100 kHz is passed. Moreover, in order to reduce the skin effect, a copper element wire having a diameter of about 0.1 mm was used as a conductive wire. In addition,
A particularly optimum heating frequency is about 60 kHz to about 80 kHz. This means that the higher the heating frequency is, the smaller the current flowing in the heating coil is. On the other hand, the higher the heating frequency is, the more the resistance against the high frequency current of the heating coil is increased. Therefore, when the heating frequency is balanced, the heating frequency is about 60 kHz to about 80 kHz.
The optimum frequency is kHz. Further, the number of wires or the diameter of the heating coil is determined by the design.

The coil conductor in this embodiment has a three-stage lap twist structure. In the figure, as the first stage,
The right-handed twisted bundled wire 6 and the left-handed twisted bundled wire 7 are formed by using a plurality of strands or bundled wires. Next, as a second step, centering on the left twisted assembly wire 7, and on the outside thereof, 3 bundles of the right twisted assembly wire 6 and 3 bundles of the left twisted assembly wire 7 are alternately assembled, and a new assembly of the second step is newly formed. Form line 8. Therefore, in the second-stage assembled wire, 3 bundles of right-handed twisted wires 6 and 4 bundles of left-handed twisted wires 7 are used.
A total of 7 bundles will be formed.

The number of bundles of the assembly lines 8 in the second stage is not limited to the number of bundles, and may be two or more. Further, the ratio of the number of bundles of the right-handed twisted bundled wire 6 and the left-handed twisted bundled wire 7 is not limited to the above, and it is sufficient if at least one of the bundles includes at least one bundle. For example, the right twisted aggregated wire 6 may be provided in the center, and the left twisted aggregated wire 7 may be arranged in 6 bundles around it. Further, in the present embodiment, the right twist assembly line 6 and the left twist assembly line 7 are alternately arranged around the center assembly line, but the arrangement is not necessarily limited to this configuration and they are arranged randomly. It may be configured. However, by arranging them alternately as will be described later, it becomes difficult to align the directions of the currents between the bundles, so that the effect of reducing the proximity action becomes large. Further, in the production of the second-stage assembled wire 8, two bundles or more of the first-stage assembled wire may be twisted as a set into a right-handed twisted assembly wire and a left-handed twisted assembly wire, and these may be bundled. .

Next, as the third stage, the assembly line 8 of the second stage
5 bundles are bundled into a third-stage assembly line 9. At this time, as described in connection with the production of the second-stage assembly wire 8, the second-stage assembly wire 8 may be bundled as it is, or may be bundled by being twisted into right twist and left twist. In addition,
Five bundles of the second-stage gathering lines 8 are used to form the third-stage gathering lines 9, but the number of bundles is determined by the design as described above. The assembly line 9 of the third stage is used as the winding of the heating coil 3. Of course, it is also possible to prepare a multi-stage assembly line that is equal to or larger than the third-stage assembly line and use it as the winding of the heating coil 3.

As can be understood from the above description, the right-handed twisted assembly wire and the left-handed twisted assembly wire may be produced at any stage, or after the right-handed twisted assembly wire and the left-handed twisted assembly wire are bundled,
Needless to say, the right-handed twisted assembly wire and the left-handed twisted assembly wire may be repeatedly manufactured and bundled in the next stage.

As described above, according to this embodiment, since the thin wire having the diameter of 0.1 mm is used as the element wire,
It is possible to prevent an increase in resistance due to the skin effect when a high-frequency current is applied, and to bundle the right-handed twisted assembly wire and the left-handed twisted assembly wire into a coil conductor to make the current directions uneven. Therefore, the bias of the current (charge) due to the proximity effect can be reduced and the increase of the resistance can be prevented.

Further, the structure of the coil conductor may be as shown in the sectional view of FIG. That is, in the figure, two bundles of the right-hand twisted bundled wire 6 and the left-handed twisted bundled wire 7 in the first stage,
The second stage assembly line 10 is manufactured using a total of four bundles.
In FIG. 3, in order to make the effect even larger, the right twisted assembly line 6
And the left twisted assembly line 7 are arranged alternately. With this configuration, the directions of the currents between the adjacent bundles become uneven, and the influence of the proximity action can be reduced. Further, seven bundles of the second-stage assembly lines 10 are bundled into a third-stage assembly line 11, and the second-stage assembly line 11 is used as the winding of the heating coil 3. This can increase the induction heating efficiency of the heating coil.

It should be noted that the right-handed twisted bundle and the left-handed twisted bundle may be bundled in the same amount at any stage, but the first stage as much as possible, that is, the first stage, makes the uneven portion of the current flow uniform. It is effective.

As the second-stage assembled wire, the right twisted assembled wire 6 and the left twisted assembled wire 7 are twisted one by one in advance as shown in FIG. 4 to form a basic assembled wire 12 shown in FIG. A plurality of basic assembly wires 12 may be used and bundled by twisting or the like to form a second-stage assembly wire 13. With this configuration, as in the case described with reference to FIG. 3, the directions of the currents between the adjacent bundles become uneven, and the influence of the proximity action can be reduced.

It should be noted that it is possible to bundle the right-handed twisted assembly line and the left-handed twisted bundled wire into a basic assembly line at any stage. And is effective.

(Embodiment 2) The feature of this embodiment is that a plurality of wire bundles having different twist pitch dimensions are formed by twisting a plurality of strands or aggregate wires, and at least twist wires having different twist pitch dimensions are formed. The point is that a multi-stage lap-twist structure is formed by using a plurality of wires and further twisting a super-assembled wire. This will be described below with reference to the drawings.

FIG. 6 shows, as a first step, using a strand or an aggregated wire, an aggregated wire 14 having a twist pitch of 25 mm, an aggregate wire 15 having a twist pitch of 30 mm and an aggregate wire 1 having a twist pitch of 35 mm.
6 was produced, these three types of assembly lines were bundled to produce a second-stage assembly line 17, and further, three bundles of the second-stage assembly line 17 were used to produce a third-stage assembly line 18. Is. Here, the twist pitch is the interval from one twisted portion to the next twisted portion in the same state. If the twisting pitches are different, the twisting condition of the strands is different. Therefore, when the assembly wires having different twisting pitches are stacked as in this embodiment, the direction of current flow is not constant. That is, since the directions of the electric currents are not uniform, the influence of the proximity action can be reduced.

Further, when using the assembly wires having different twist pitches, it is preferable that the ratio of the twist pitch dimensions does not become an integral multiple of each other. This is because the same state is repeated when there is an assembly line having an integral multiple, and the number of portions where the directions of the currents are not uniform is reduced as a whole.

In the above embodiment, the case where three kinds of aggregate wires having different twist pitches are used has been described, but the present invention is not limited to this and may be two kinds or more. good.

Further, the step of bundling different twist pitches may be performed at any step, and the point is to use a wire assembly having different twist pitches and having a coil structure in which the directions of the currents are uneven.

Of course, the assembly line may be produced by combining the first embodiment and this embodiment.

Further, the multi-stage lap winding has been described as having three stages, but the present invention is not limited to this and it is not limited to this.
Needless to say, the number of stages may be more than that.

(Embodiment 3) FIG. 7 is a top view of the heating coil portion of this embodiment. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, a coil conductor 19 is a strand or a bundle of strands that are twisted together at an irregular twist pitch. The coil conductor is wound to produce the heating coil 3. When the heating coil 3 is wound by using the assembly wire twisted with such an irregular twist pitch, the n-th winding of the heating coil 3 is the (n-1) -th winding inside thereof. At the outside, the windings 19 come into contact with the n + 1th winding, respectively, but at this time, since the winding wire 19 is twisted at an irregular twisting pitch, there is almost no place where the strands of the assembly wire have the same direction at the contact portion. Absent. Therefore, the directions of the currents are uneven, and the increase in resistance due to the proximity effect can be suppressed.

(Embodiment 4) FIG. 8 is a plan view showing the structure of a coil conductor wire in this embodiment, and FIG. 9 is a sectional view of the coil conductor wire. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, the coil conducting wire 20 is formed by using a strand or a gathering wire to separately form a right-handed circular tube-shaped spiral portion 21 formed of a clockwise spiral and a left-handed circular spiral portion 22 formed of a left-handed spiral, Left spiral 22
The right spiral portion 21 is provided close to the inside of the. In this configuration, as compared to the circular tubular coil conductor consisting of spirals only in the same direction, the right spiral portion 21 and the left spiral portion 22 are divided into the circular tubular coil conductor wires, so that the strands of wire or aggregate wires are close to each other. Even in the portion where the current flows, the direction of the current is different, unlike the case where the conductor wire is formed of a spiral in only the same direction, and thus the influence of the proximity action can be reduced. When an object to be heated such as a pan is induction heated, an eddy current is generated in the object to be heated in the direction opposite to the heating coil current, and the proximity effect of the eddy current draws the current flowing in the heating coil to the object to be heated. However, by bringing the right spiral portion 21 and the left spiral portion 22 close to each other, the distance between the object to be heated and the right spiral portion 21 becomes equal to the distance between the heated portion and the left spiral portion 22, and Spiral part 21
The bias of the current flowing between the left spiral portion 22 and the left spiral portion 22 is reduced, and the loss of the heating coil is reduced.

In the above embodiment, the right spiral portion 21 is provided inside the left spiral portion 22. However, on the contrary, the left spiral portion 22 may be provided inside the right spiral portion 21 without any problem.

Further, instead of superposing the right spiral portion 21 and the left spiral portion 22 as described above, in manufacturing the coil conductor 23 as shown in FIG. 10, a clockwise spiral and a counterclockwise spiral are formed inside and outside. Even if the relations are alternately changed, the direction of the current is different at the portion where the clockwise spiral portion and the counterclockwise spiral portion are close to each other, so that the influence of the proximity action can be reduced as in the previous example. it can. Further, the distance between the object to be heated and the right spiral portion 21 and the distance between the heated portion and the left spiral portion 22 are the same, the currents flowing through the right spiral portion 21 and the left spiral portion 22 are the same, and the heating coil Loss is reduced.

In addition, as shown in FIG.
In manufacturing, the internal / external relationship between the right spiral portion 21 and the left spiral portion 22 may be switched for each predetermined length. That is, in a certain range, the left spiral portion 22 forms the outer side of the coil conductor 24 as shown in FIG. 8, and in the next range, the right spiral portion 21 forms the inner side of the coil conductor 24. To do. Then, the inside / outside replacement is repeated for each predetermined range. At this time, the linear portion 25 is provided,
If you change the internal and external relations in this part, you can easily change the relationship. Also in this case, the influence of the proximity effect can be reduced and the loss of the heating coil can be reduced as in the previous example. Further, the right spiral portion 21 and the left spiral portion 22 can be easily exchanged with each other, so that workability is improved, productivity is improved, and cost is reduced.

Further, the circular tubular coil conductor having the right spiral portion and the left spiral portion obtained in this embodiment is pressed to make the circular tubular flat shape and newly wound as a coil conductor, as shown in FIG.
The heating coil 26 may be manufactured as shown in FIG. The heating coil 26 thus obtained is substantially the same as the heating coil manufactured by using the assembly lines having different current directions, and the increase in resistance due to the bias of the current due to the proximity action is reduced. In addition, the induction heating efficiency can be improved. In each embodiment, the heating coil has a diameter of 0.
Although a wire having a diameter of 1 mm was used, the action does not particularly differ depending on the diameter of the wire, and the same effect can be obtained with a thin wire such as a wire having a diameter of 0.04 to 0.06 mm.

[0044]

As described above, according to the first to twelfth aspects of the present invention, the effects of the skin effect and the proximity effect are reduced, the coil resistance to the high frequency current of the heating coil is reduced, and the efficiency of induction heating is improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a coil conductor wire of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the induction heating cooker.

FIG. 3 is a sectional view showing another configuration of the coil conductor of the induction heating cooker.

FIG. 4 is a configuration diagram of a stranded wire of the induction heating cooker.

FIG. 5 is another sectional view of a coil wire of the induction heating cooker.

FIG. 6 is a sectional view of a coil wire of an induction heating cooker according to a second embodiment of the present invention.

FIG. 7 is a plan view of a heating coil unit of an induction heating cooker according to a third embodiment of the present invention.

FIG. 8 is a plan view showing a configuration of a coil conductor wire of an induction heating cooker according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a coil wire of the induction heating cooker.

FIG. 10 is a plan view showing another configuration of the coil wire of the induction heating cooker.

FIG. 11 is a plan view showing another configuration of the coil conductor of the induction heating cooker.

FIG. 12 is a sectional view of a heating coil of the induction heating cooker.

[Explanation of symbols]

3,26 heating coil 6 right twisted assembly line 7 Left twisted assembly line 19, 20, 23, 24 Coil conductors 21 Right spiral part 22 Left spiral part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuyoshi Makio             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3K051 AA08 AD25 CD43

Claims (12)

[Claims] 1. An induction heating cooker provided with a heating coil comprising a wire assembly in which right-handed twisted wire and left-handed twisted wire are mixed. 2. In a heating coil formed by winding a coil conductor, by applying a high-frequency current to induction-heat an object to be heated, the coil conductor uses a plurality of strands or aggregates of right twisted aggregated wire and left twisted aggregated wire. An induction heating cooker having a multi-stage lap twist structure formed by forming a twisted aggregate wire and further twisting at least one bundle of right twisted aggregate wires and one bundle of left twisted aggregate wires and further twisting them. 3. The induction heating cooker according to claim 2, wherein the coiled wire has a configuration in which the same number of right-handed twisted wires and left-handed twisted twisted wires are used for at least one step of twisting. 4. The induction heating according to claim 2, wherein the coil conductor has a configuration in which a bundle of right-hand twisted wires and a bundle of left-hand twisted wires are pre-twisted in a bundle for at least one stage of twisting. Cooking device. 5. A method for inductively heating an object to be heated by passing a high-frequency current through a heating coil formed by winding a coil conductor, wherein the coil conductor is formed by twisting a plurality of strands or aggregates of two or more kinds. An induction heating cooker having a multi-stage lap twist structure in which a plurality of aggregate wires having different pitch dimensions are formed, and at least a plurality of aggregate wires having different twist pitch dimensions are further twisted to form a superordinate aggregate wire. 6. The induction heating cooker according to claim 5, wherein the coil wire is a bundle of assembly wires in which the ratio of different pitch dimensions is not an integral multiple. 7. An induction heating cooker in which a high-frequency current is passed through a heating coil to induction-heat an object to be heated, in which the heating coil is provided by twisting strands or aggregated wires at irregular pitches and winding them. . 8. A method for inductively heating an object to be heated by passing a high-frequency current through a heating coil formed by winding a coil conductor wire, wherein the coil conductor wire is formed by using a plurality of element wires or aggregate wires, An induction heating cooker configured by a gathering line in which a circular tubular right spiral portion made of a spiral and a circular tubular left spiral portion made of a counterclockwise spiral are mixed. 9. The coil conductor according to claim 8, wherein the right spiral part and the left spiral part are separately formed, and the other spiral part is provided in proximity to the inside of one of the spiral parts. Induction cooker. 10. The induction heating cooker according to claim 8, wherein the coil wire is configured such that the inner and outer relations of the right and left spiral portions having a circular tubular shape are alternately switched each time the strands or the assembly lines intersect. . 11. The induction heating cooker according to claim 8, wherein the coil wire is configured such that the inner and outer relations of the right spiral portion and the left spiral portion having a circular tubular shape are switched for each predetermined length. 12. The induction heating cooker according to claim 8, further comprising a heating coil in which a coil wire having a circular tubular spiral portion is pressed and wound in a flat shape.