JP4887979B2 - Induction heating roller device - Google Patents

Description

  The present invention relates to an induction heating roller device that heats an object such as synthetic fiber in contact with a roller surface, such as used in a drawing heating process of a synthetic fiber manufacturing process.

Among heating roller devices that heat an object in contact with the roller surface, a device that uses an induction heating method as its heating method is called an induction heating roller device.
The induction heating roller device is used, for example, in a drawing heating process of a synthetic fiber manufacturing process. When used in the drawing heating process of the synthetic fiber manufacturing process, for example, by providing two adjacent rotating rollers in the induction heating roller device, the synthetic fibers are fed between the rollers, and the rotating rollers are provided. Then, the synthetic fiber is drawn and heated.

A mechanism for heating one rotating roller of such an induction heating roller device is described in the following two patent documents.
One shows a configuration in which two heating coils are disposed close to the outer peripheral surface of the rotating drum. In this case, the rotating drum is induction-heated by the two heating coils. In addition, a configuration in which a heating coil is cylindrically wound around the outer peripheral circle of the fixed drum via a core is also shown. In this configuration, since the heating coil is disposed inside the rotating drum, the rotating drum is induction-heated from the inside (see Patent Document 1).

Other one, the fixed core consisting of cylindrical member of non-magnetic material and fixed to an inner periphery of the fixed position of the row La body, and, on top of the fixed core, winding density in accordance with induction coils to the roller axis direction The structure which winds by changing is shown. When high frequency is applied to the Yi Sunda transfection coil of that row La is induction heating, further, to equalize the row La surface temperature in the low-La-axis direction. (See Patent Document 2).
JP-A-4-212283 (paragraphs “0005”, “0025”, “0030”, FIG. 1, FIG. 5, FIG. 6, FIG. 10) JP-A-8-296142 (paragraphs “0011”-“0013”, FIG. 1)

  In the induction heating roller device, conventionally, the heating of the roller is performed by arranging a heating coil on the outer peripheral side of the roller as described above or by arranging a heating coil on the inner peripheral side of the roller. It was.

The latter roller having a heating coil disposed on the inner peripheral side employs a method in which the roller is induction-heated by, for example, winding a heating coil around a fixed core made of a cylindrical member.
However, in this configuration, since a mechanism such as a fixed core and a coil must be provided on the inner peripheral side of the roller, for example, the support structure of the roller becomes complicated. In addition, the weight increases to ensure strength. For this reason, there are problems such as difficulty in securing the bearing strength and increase in motor capacity.

  On the other hand, in the case where the heating coil is arranged on the outer peripheral side of the former roller, the above problems are reduced. However, since the heating coil is only disposed on the outer peripheral side of the roller, there is a problem that the magnetic flux generated from the coil is not efficiently guided to the roller and consumes a large current for heating the coil. Further, in this configuration, since the heating coil is disposed close to the outer periphery of the roller, for example, workability when winding resin-based yarns around the roller is a problem.

  Therefore, the present invention has been made in view of the above problems, and provides an induction heating roller device having high heating efficiency from the coil to the roller even when the heating coil is arranged on the outer peripheral side of the roller. Objective.

  The present invention that solves the above-described problems is an induction heating roller device that inductively heats a roller by passing an alternating current through a coil wound in a racetrack shape. In the induction heating roller device, a fixed core and a racetrack shape are provided outside the roller. An end portion of the coil that has a wound coil and protrudes from the fixed core on the side where the structure other than the heating target is adjacent is bent vertically from the end of the fixed core to the opposite side of the heating target. It is the induction heating roller apparatus characterized by having.

Further, the present invention for solving the above-mentioned problems has a driving means for rotating the roller, and the roller is cantilevered by the driving means, and the end of the coil protruding from the fixed core on the driving means side. The portion is bent vertically from the end of the fixed core to the opposite side of the object to be heated.

In the present invention, since the fixed core and the coil are not formed inside the roller, the support structure of the roller, which is complicated by being inside the roller, can be simplified. At the same time, since the demand for ensuring strength is also alleviated, the total weight of the induction heating low la apparatus also becomes possible to suppress. Therefore, it is easy to secure the bearing strength, and the motor capacity can be kept low.

In addition, since the fixed core is provided, it is possible to suppress the leakage magnetic flux, and it is possible to suppress the influence of the magnetic field on the neighboring peripheral structures.
On the other hand, the magnetic field can be efficiently guided to the roller surface side so that the loop trajectory of the magnetic field lines around the coil is linked more with the roller surface. This leads to reaching the conventional heating power of the roller with a small current, that is, improving the heating efficiency.

  Moreover, since the magnetic field of the coil is controlled to be directed toward the roller surface without leakage more than before, the arrangement of the coil can be moved away from the roller surface. In this case, for example, workability at the time of winding resin-based yarns around the roller is remarkably improved.

  In addition, by providing a coil on the outside of the roller, the outer surface of the roller used for drawing and heating such as plastic and synthetic fiber can be directly heated, and the responsiveness such as the rise time of the surface temperature of the roller is good. Become. Further, the heat dissipation is excellent, and it is not necessary to take measures for cooling the coil as in the case where the coil is provided inside the roller.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view of an induction heating roller device of the present invention.

Fig.1 (a) is the figure which showed the induction heating roller apparatus of this invention from the side. FIG. 1B is a cross-sectional view taken along the line AA ′ in FIG.
The induction heating roller device 1 shown in FIG. 1 includes, for example, a roller 10 for stretching and heating synthetic fibers and plastics, induction heating control means 12 for induction heating the roller 10, and roller driving for rotating the roller 10. Means 14.

  In this configuration, the roller driving means 14 has one end face 142-1 of the motor 142 fixed to the support base 140, and further supports a rotating shaft 144 connected to an output shaft (not shown) of the motor 142. It is configured to pass through the base 140 and protrude to the opposite side.

  The roller 10 is made of, for example, a steel material formed into a hollow cylindrical shape with a bottom. In this configuration, a jacket (or heat pipe) 102 is further provided on the roller 10 in order to make the temperature distribution in the axial direction of the roller 10 uniform. The jacket (or heat pipe) 102 is disposed near the surface of the roller 10 (close to the inside of the roller 10 in this configuration) from the one end surface 10-1 to the other end surface 10-2 in the direction of the rotating shaft 144. Has been. In FIG. 1A, the roller surface is partially omitted to show the internal configuration in an easy-to-understand manner, and the internal configuration is shown in a sectional view at the center of the rotation axis.

  The roller 10 is cantilevered internally by a rotating shaft 144 of the motor 142, and the motor 142 is centered on an axis of the cylindrical body (this axis coincides with the central axis of the rotating shaft 144). And the rotation shaft 144 of the first rotation.

An induction heating control unit 12 is configured outside the roller 10.
The induction heating control means 12 includes a coil 120 wound in a racetrack shape, an AC power supply means 122 such as an inverter for supplying an alternating current to the coil 120, and a fixed core 124 for controlling the magnetic field generated by the coil 122. It is configured. The coil 120 and the stationary core 124 of at least this is configured outside of the row La 10.

  The coil 120 of the same figure wound in the shape of a race track is disposed with its coil surface (first coil surface) facing the surface of the roller 10. The coil 120 may be a one-turn coil or an N-turn coil wound in a racetrack shape. Furthermore, a plurality of the N winding coils may be laminated toward the roller surface.

  The fixed core 124 is a laminated core or a ferrite core of a magnetic steel plate. When the fixed core 124 is defined such that the coil surface (first coil surface) facing the surface of the roller 10 is the front surface and the opposite coil surface (second coil surface) is called the back surface, It is good to arrange | position to the coil surface side of a back as shown by. In the cross-sectional view of FIG. 1B, as an example, a cross section of the coil when the coil is a single-layer five-winding coil is shown, and the locus of the lines of magnetic force is indicated by an elliptical broken line. In addition, the direction of the current flowing through the coil at a certain time is also displayed as a symbol on the coil cross section. As a precaution, the symbol on the right side of the figure is a symbol indicating the direction from the paper surface side, and the symbol on the left side of the figure is a symbol indicating the direction toward the paper surface side.

  In the configuration in which the induction heating control means 12 is arranged outside the roller 10 as described above, when an alternating current (for example, a high frequency alternating current of 20 to 30 kHz) is passed through the coil 120, the direction of the current is changed. Thus, the direction of the lines of magnetic force generated from the coil 120 changes. Then, an alternating magnetic field is generated on the roller surface due to the change in the magnetic lines of force, and an eddy current is generated on the roller surface. At that time, when the roller 10 rotates, the circumferential roller surface is exposed to the magnetic field of the coil 120, and the roller surface generates heat by the eddy current.

Furthermore, since the fixed core is provided in this configuration, the magnetic field generated from the coil is controlled so as not to spread beyond the fixed core. In particular, when the fixed core is arranged on the back coil surface side, the magnetic field lines generated on the back coil surface side are controlled so as not to spread far away as shown in FIG. . In contrast, the magnetic field lines generated in the coil side of the table is pushed into the low la surface. Therefore, the number of rows la surface interlinked magnetic lines increases relatively.

  That is, since the fixed core is provided, it is possible to efficiently guide the magnetic field to the roller surface side so that the loop locus of the magnetic force lines around the coil is more linked to the roller surface. This leads to reaching the conventional heating power of the roller with a small current, that is, improving the heating efficiency.

  In addition, by providing a coil on the outside of the roller, the outer surface of the roller used for drawing and heating such as plastic and synthetic fiber can be directly heated, and the responsiveness such as the rise time of the surface temperature of the roller is good. Become. Further, the heat dissipation is excellent, and it is not necessary to take measures for cooling the coil as in the case where the coil is provided inside the roller.

In addition, the fixed core makes it possible to suppress the leakage magnetic flux and to suppress the influence of the magnetic field on the neighboring peripheral structures.
Moreover, since the magnetic field of the coil is controlled to be directed toward the roller surface without leakage more than before, the arrangement of the coil can be moved away from the roller surface. In this case, for example, workability at the time of winding resin-based yarns around the roller is remarkably improved.

Further, in this configuration, since the fixed core and the coil are not configured inside the roller, it leads to simplification of the support structure of the roller which is complicated by being inside the roller. At the same time, since the demand for ensuring strength is also alleviated, the total weight of the induction heating low la apparatus also becomes possible to suppress. Therefore, it is easy to secure the bearing strength, and the motor capacity can be kept low.

In the above, a hollow cylindrical roller is shown, but the shape is only an example. Hereinafter any and to show examples using this configuration, the present invention is not limited to the shape of the row La.

Hereinafter, specific structures of the fixed core 124, the coil 120, and the like will be shown, and respective functions and effects when configured in the induction heating roller device will be described.
Example 1
FIG. 2 is a structural diagram of a fixed core in the first embodiment.

In the figure, an outline view of the fixed core drawn from the oblique direction and an outline view of the roller 10 are shown with the fixed core in order to show a positional relationship with the roller 10.
The fixed core 200 of the first embodiment includes a curved body 200-1 that follows the roller surface so that the distance from the roller surface in the outer circumferential direction of the roller 10 is substantially constant. In the first embodiment, the fixed core 200 further includes protrusions (200-2 to 200-4) protruding toward the roller surface at the center and both ends of the main body 200-1.

In Example 1, the protrusions (200-2 to 200-4) are provided across both ends of the main body 200-1 in the direction of the rotation axis of the roller 10.
FIG. 3 is a structural diagram (part 1) of a coil arranged with respect to the fixed core 200 of the first embodiment.

Fig.3 (a) is a bottom view of the fixed core and coil which were drawn from the B direction of FIG.
FIG. 3B is a square cross-sectional view of the fixed core and the coil at the position of the line CC ′ in FIG.

FIG. 3C is a side sectional view of the fixed core and the coil at the position of the line DD ′ in FIG.
In each figure, the direction of the current flowing in the coil at a certain point in time is shown using the same symbols as in FIG.

  The coil 250 in this structural diagram (part 1) is disposed on the bottom surface of the fixed core 200 (the surface on the side facing the surface of the roller 10 in FIG. 2). The coil 250 is wound outwardly in a racetrack shape along the curved surface of the main body 200-1 around the central protrusion 200-2 of the fixed core main body 200-1. The coil 250 is rewound to the inside of the main body 200-1 so as to protrude outward from the main body 200-1 of the fixed core at both ends in the rotation axis direction of the main body 200-1. And the winding terminal of the winding start and the end of the coil is connected to an inverter (not shown) (AC current supply means 122 in FIG. 1), and a high frequency current of 20 to 30 kHz, for example, is supplied.

In FIG. 3B and FIG. 3C, the lines of magnetic force generated from the coil in this configuration are indicated by broken lines.
As described above, in Example 1, the main body 200-1 of the fixed core has a curved shape in which the distance from the roller surface in the outer circumferential direction of the roller 10 is substantially constant. And the protrusion part (200-2 to 200-4) which protruded to the roller surface side in the center and both ends of the main body 200-1 was provided. Therefore, the lines of magnetic force generated from the coil wound along this bottom surface are, as shown in FIG. Is controlled to follow the curved surface shape of the main body 200-1, that is, to be parallel to the roller surface. Second, the protrusions (200-2 to 200-4) are controlled so that the lines of magnetic force that wrap around from the back coil surface to the front coil surface are directed toward the roller surface side. In addition, the front coil The lines of magnetic force that run from the surface to the back coil surface are also controlled.

With this structure (part 1), the total number of lines of magnetic force linked to the roller increases, and heat is uniformly generated in the range of the fixed core in the outer peripheral direction of the roller surface.
FIG. 3C is a diagram showing lines of magnetic force generated from the coil wires protruding from both ends of the fixed core. As shown in the figure, the lines of magnetic force generated from the coil wire protruding from the fixed core spread to the periphery because they are hardly controlled by the fixed core.

Since surrounding structures are heated by induction current due to the influence of magnetic flux leaking from the coil, it is necessary to take measures such as providing a magnetic shielding plate on the coil or structure.
When there is no only set the magnetic shielding plate, in order that not affected by the leakage flux, it is necessary to place away as possible the coil from the surrounding structures (for example, a motor support base, etc.).

FIG. 4 is a structural diagram (No. 2) of a coil arranged with respect to the fixed core 200 of the first embodiment.
This structural diagram (Part 2) also shows a bottom view, a square cross-sectional view, and a side cross-sectional view in the same manner as the above-described structural diagram (Part 1). Each figure shows the current flowing through the coil at a certain point in time. The direction is shown using symbols similar to those in FIG.

Below, a different point from a structure (the 1) is demonstrated.
The coil 280 of this structure (No. 2) fixes the coil wire protruding from the fixed core body on the side adjacent to the other structure (in this example, the motor support) in the coil 250 of the structure (No. 1). The structure is bent vertically from the end of the core body.

In this structure (part 2), as shown in FIG. 4C, the influence of the magnetic lines of force generated from the coil wire vertically raised on other structures is suppressed.
Therefore, the structure (part 2) can arrange the coil at a position closer to the other structure than the structure (part 1).

(Example 2)
FIG. 5 is a structural diagram of a fixed core in the second embodiment.
In the same figure, in the same manner as in the first embodiment, an outline view of the fixed core drawn from the oblique direction and an outline view of the roller 10 are shown with the fixed core to show the positional relationship with the roller 10. ing.

Hereinafter, differences from the first embodiment will be described.
The fixed core 300 of the second embodiment is different in the structure of the protrusion 200-2 provided at the center of the main body of the fixed core 200 of the first embodiment.

  The protruding portion 300-2 at the center of the main body of the fixed core 300 according to the second embodiment is provided with notches for folding the coil wire at both ends in the rotation axis direction of the main body 200-1 and in the inner region in the vicinity thereof. . That is, the protrusion is not configured in this region.

  FIG. 6 is a structural diagram (No. 3) of coils arranged with respect to the fixed core 300 according to the second embodiment. This structural diagram (No. 3) is also similar to the above-described structural diagrams (No. 1 and No. 2), and shows a bottom view, a square sectional view, and a side sectional view. The direction of the flowing current is shown using symbols similar to those in FIG.

Hereinafter, the difference from the configuration (No. 1) will be described. The coil 350 in the present structural diagram (No. 3) is a curved surface of the main body 200-1 around the central protrusion 350-2 of the fixed core main body 200-1. It is wound outward in a racetrack shape along. The coil 350 is housed inside the main body 200-1 so as not to protrude outward from the main body 200-1 of the fixed core at both ends in the rotation axis direction of the main body 200-1.

  FIG. 6C is a diagram showing lines of magnetic force generated from coil folding lines at both ends of the fixed core. As shown in the figure, since the coil wire is housed in the fixed core, the magnetic field lines generated from the coil are also controlled by the fixed core at the folded portion of the coil, and spread to other structures. Suppress.

  For this reason, in the case of this structure (No. 3), other structures (for example, a motor support base) are hardly affected by the lines of magnetic force, so that the coil is disposed adjacent to the other structures. be able to.

Therefore, even if it has been arranged as far as possible from the structure in consideration of the influence on the surrounding structure, the influence on the surrounding structure is considered by adopting this structure (Part 3). it not, it becomes possible to place the coil on the best place for heating the low-La surfaces.

  In the above description of the structure (No. 3), the figure is shown in which the coil is housed in the fixed core so that the outermost folded portion of the coil coincides with the end of the fixed core. A structure in which the main body of the fixed core protrudes outside the outermost outer periphery of the coil may be used as long as it is inside the fixed core.

(Example 3)
FIG. 7 is a structural diagram of a fixed core in the third embodiment.
In the same figure, in the same manner as in the first embodiment, an outline view of the fixed core drawn from the oblique direction and an outline view of the roller 10 are shown with the fixed core to show the positional relationship with the roller 10. ing.

Hereinafter, differences from the first embodiment will be described.
The fixed core 400 of the third embodiment is different in the structure of the protrusion 200-2 provided at the center of the main body of the fixed core 200 of the first embodiment.

  The protrusion 400-2 at the center of the main body of the fixed core 400 according to the third embodiment includes a coil at an end in the rotation axis direction of the main body 200-1 (an end on the side where there is another structure) and an inner region in the vicinity thereof. A notch for folding the line is provided. That is, the protrusion is not configured in this region.

  FIG. 7 is a structural diagram (No. 4) of coils arranged with respect to the fixed core 400 of the third embodiment. This structural diagram (No. 4) also shows a bottom view, a square cross-sectional view, and a side cross-sectional view in the same manner as the above-described structural diagrams (No. 1, No. 2 and No. 3). The direction of the current flowing through the coil is shown using symbols similar to those in FIG.

Hereinafter, the difference from the configuration (No. 1) will be described. The coil 450 in the present structural diagram (No. 4) has a curved surface of the main body 200-1 around the central protrusion 450-2 of the fixed core main body 200-1. It is wound outward in a racetrack shape along. The coil 450 does not protrude from the main body 200-1 of the fixed core at the end in the rotation axis direction of the main body 200-1 (in this example, the end where the motor support base is configured). It is housed inside the main body 200-1.

  FIG. 8C is a diagram showing lines of magnetic force generated from the coil folding line at the end of the fixed core. As shown in the figure, since the coil wire is housed in the fixed core, the magnetic field lines generated from the coil are also controlled by the fixed core at the folded portion of the coil, and spread to other structures. Suppress.

  For this reason, in the case of this structure (No. 4), other structures (for example, a motor support stand) are hardly affected by the magnetic lines of force, so that the coil is disposed adjacent to the other structures. be able to.

Therefore, so far even in the case which has been arranged as much as possible away from the structure in consideration of the influence of the surrounding structure, the present structure (the four) coils best place for heating the low-La surface Can be placed. Moreover, since it is not necessary to house the coil in the fixed core at the fixed core end on the side where there is no other structure, the material of the fixed core can be reduced accordingly.

  In the above description of the structure (No. 4), the figure is shown in which the coil is housed in the fixed core so that the outermost folded portion of the coil coincides with the end of the fixed core. A structure in which the main body of the fixed core protrudes outside the outermost outer periphery of the coil may be used as long as it is inside the fixed core.

  As described above, the configurations shown in the first to third embodiments are examples. For this reason, you may implement this invention, combining the structure shown in each Example, respectively, or combining a structure to others.

  As described above, in this embodiment, the fixed core and the coil are provided outside the roller of the induction heating roller device. Since there is a fixed core, it is possible to control the magnetic field of the coil that is generated when an alternating current flows. In particular, when the first coil surface is disposed parallel to the surface of the roller and the fixed core is disposed on the second coil surface side, the magnetic field spreading on the second coil surface side causes the fixed core to Deter the spread beyond.

Also, increasing the total number of interlinked magnetic force lines on the outer peripheral surface of the low LA. Furthermore, if there is a protrusion as described above in that fixed core can be controlled to direct the trajectory of the magnetic field lines around the coil on the outer circumferential surface of the low la, the outer peripheral surface of the low-La interlinked magnetic lines The total number further increases.

In addition, when at least each surface facing the surface of the roller on the coil and the fixed core is bent so that the distance from the surface is substantially constant in the outer circumferential direction of the surface of the roller. since the distance interlinkage magnetic force lines on the outer peripheral surface of the low-La penetrates the outer circumferential direction of the row La is longer, the effect of the induction heating in a wider range of the outer peripheral direction of the row La is obtained.

Since the fixed core and the coil are not formed inside the roller, the support structure for the roller, which is complicated by being inside the roller, can be simplified. At the same time, since the demand for ensuring strength is also alleviated, the total weight of the induction heating low la apparatus also becomes possible to suppress. Therefore, it is easy to secure the bearing strength, and the motor capacity can be kept low.

In addition, since the fixed core is provided, it is possible to suppress the leakage magnetic flux, and it is possible to suppress the influence of the magnetic field on the neighboring peripheral structures.
On the other hand, the magnetic field can be efficiently guided to the roller surface side so that the loop trajectory of the magnetic field lines around the coil is linked more with the roller surface. This leads to reaching the conventional heating power of the roller with a small current, that is, improving the heating efficiency.

  Moreover, since the magnetic field of the coil is controlled to be directed toward the roller surface without leakage more than before, the arrangement of the coil can be moved away from the roller surface. In this case, for example, workability at the time of winding resin-based yarns around the roller is remarkably improved.

In the above embodiment, a high frequency current is used. For this reason, since the number of coil turns, which is several hundred turns at the commercial frequency, is about ten turns, the coil can be miniaturized.
In addition, since the number of coil turns is small, the structure is simple and the manufacturing cost can be reduced.

In addition, the use of an inverter power supply enables a reduction in running cost during operation because the thermal efficiency and power factor are good.
Further, since the coil is provided outside the roller, the roller structure and the roller support structure can be simplified, and the cost for the rotating shaft, the bearing, and the motor can be reduced.

  Even when there is not enough space for arranging the coils, if the coils are divided and arranged, it is possible to install the coils without hindering workability.

It is a schematic diagram of the induction heating roller apparatus of this invention. . 3 is a structural diagram of a fixed core in Example 1. FIG. . In the structure figure (the 1) of the coil arrange | positioned with respect to the fixed core 200 of Example 1. FIG. 6 is a structural diagram (No. 2) of coils arranged with respect to the fixed core 200 according to the first embodiment. 6 is a structural diagram of a fixed core in Example 2. FIG. FIG. 10 is a structural diagram (No. 3) of coils arranged with respect to the fixed core 300 according to the second embodiment. 6 is a structural diagram of a fixed core in Example 3. FIG. FIG. 6 is a structural diagram (No. 4) of coils arranged with respect to the fixed core 400 of the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Induction heating roller apparatus 10 Roller 12 Induction heating control means 14 Roller drive means 102 Jacket (or heat pipe)
120 Coil 122 AC power supply means 124 Fixed core
140 Motor 142 Support stand 144 Rotating shaft

Claims (6)

In an induction heating roller device for inductively heating a roller by passing an alternating current through a coil wound in a racetrack shape,
Outside the roller, it has a fixed core and a coil wound in the racetrack shape,
The induction heating is characterized in that the end of the coil protruding from the fixed core on the side adjacent to the structure other than the heating target is bent vertically from the end of the fixed core to the opposite side of the heating target. Roller device. Drive means for rotating the roller;
The roller is cantilevered by the driving means,
2. The induction heating according to claim 1, wherein an end portion of the coil protruding from the fixed core on the driving means side is bent vertically from an end portion of the fixed core to an opposite side to a heating target. Roller device. The coil wound in the shape of the racetrack is arranged such that the first coil surface faces the surface of the roller parallel to the surface of the roller,
The fixed core is disposed on the second coil surface side opposite to the first coil surface,
The induction heating roller device according to claim 1 or 2 , characterized in that. The fixed core is
The second are arranged face to face on the coil surface of the second parallel to the coil plane, and, ridge protruding surface side of the row La inside the range of the innermost coil of said coil Having
The induction heating roller device according to claim 3 . The stationary core further comprises a ridge protruding surface side of the row La outside the range of the outermost coils of the racetrack shape wound coil,
The induction heating roller device according to claim 4 . Each surface on the coil and the fixed core that faces at least the surface of the roller is bent so that the distance from the surface is substantially constant in the outer circumferential direction of the surface of the roller.
The induction heating roller device according to any one of claims 1 to 5 , wherein