JP3668260B2 - Eddy current convergence type heating device in electromagnetic induction heating - Google Patents

Eddy current convergence type heating device in electromagnetic induction heating Download PDF

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Publication number
JP3668260B2
JP3668260B2 JP13602694A JP13602694A JP3668260B2 JP 3668260 B2 JP3668260 B2 JP 3668260B2 JP 13602694 A JP13602694 A JP 13602694A JP 13602694 A JP13602694 A JP 13602694A JP 3668260 B2 JP3668260 B2 JP 3668260B2
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Japan
Prior art keywords
electromagnetic induction
induction heating
winding
magnetic flux
eddy current
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JP13602694A
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JPH088052A (en
Inventor
正人 榎園
龍吉郎 福田
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Fujimak Corp
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Fujimak Corp
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1227—Cooking devices induction cooking plates or the like and devices to be used in combination with them for wok pans and wok pans supports for induction cooking plates

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  • Electromagnetism (AREA)
  • Cookers (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は調理用電磁誘導加熱における渦電流収束型加熱装置に関するものである。
【０００２】
【従来の技術】
従来、調理用に用いられる電磁誘導加熱では巻線が集中した部分に磁束が集中し、集中部分に渦電流が集中してその部分の温度が上昇し、平鍋、中華鍋（円弧形鍋）にしろ熱が巻線部分の密集部に集中し、その部分の食材のみ食材が焦げついたり、中心部の温度が低いという問題があった。
【０００３】
そのため図６(イ) 図の状態から図７、図８又は図９に示すように巻線を分割して磁束及び熱の集中を避ける方法が講ぜられた。しかし図１２〜図１５に示すように磁束の分散はあまり講ぜられていない。又図１８、図２１に示すようにドーナツ状に熱が集中しているのを大して改善できないという問題があった。
【０００４】
【発明が解決しようとする課題】
本発明は中心部から外周に至るスリットを有する円形導体板の内外周に渦電流が集中し、それによって該渦電流に基く磁束の集中も上記円形導体板の内外周に集中すること（特公平４−８２１６２号）に鑑み、巻線の集中による磁束の集中を分散又は均等化して鍋による被加熱物の温度分布を調整することを目的とする。
【０００５】
【課題を解決するための手段】
上記の目的を達成するため本発明は
電磁誘導加熱において、中心部から外周に至るスリットを有する縦断面溝形非磁性円形導体板によって形成される磁束収束板を電磁誘導加熱用巻線に同心円に用い、上記円形導体板の溝内に巻線を収容して被加熱物の温度分布を調整してなる電磁誘導加熱における渦電流収束型加熱装置
電磁誘導加熱用巻線の中央部に磁束収束板を用いた上記発明記載の電磁誘導加熱における渦電流収束型加熱装置
電磁誘導加熱用巻線の中央部と外周部との中間部に磁束収束板を用いる上記第１又は第２発明記載の電磁誘導加熱における渦電流収束型加熱装置
上記巻線の外周部に磁束収束板を用いる上記第１、第２、又は第３発明記載の電磁誘導加熱における渦電流収束型加熱装置
によって構成される。
【０００６】
【作用】
本発明では調理用電磁誘導加熱装置における電磁誘導加熱用巻線の中央部の空間、中央部と外周部との中間部に形成した空間又は外周部に、中心部から外周に至るスリットを有する円形導体板を上記巻線と同心円に配置する。
【０００７】
そして上記巻線に交流を導通することによって生じる磁束が上記円形導体板のスリットの対向面から該導体板の内外周に沿って渦電流を生じる。
【０００８】
この渦電流はそれぞれ磁束を発生し調理用発熱板内に渦電流を生じるため上記巻線による調理用発熱板内の渦電流は円形導体板の上記渦電流による磁束によって分散されることになる。
【０００９】
【実施例】
平底鍋６、中華鍋、ステーキ・お好み焼用等平鉄板又は家庭用電磁調理器の加熱平板５の下部に、セラミックプレート７を介して電磁誘導加熱用巻線４、４を配置して調理用電磁誘導加熱装置を形成する。
【００１０】
上記巻線４、４は中央部ｃ及び中央部ｃと外周部ｅとの中間部ｎに空間ｓが設けられる。中央部空間ｓには図１実線及び図１０に示すように中心部に中心透孔８を穿設し、該透孔８から外周に至るスリット１を有する非磁性円形導体板２によって形成される磁束収束板３を図１、図２、図４、図５に示すように巻線４、４と同心円に配置する。
【００１１】
又図３に示すように外周にのみ配置し、或は図２、図５に示すように中央部空間ｓ及び該空間ｓと外周ｅとの中間に形成した空間ｓに配置することができる。上記非磁性円形導体板２は上記図１〜図５に示すように縦断面溝形となっていて溝内に巻線４を収容するようになっている。
【００１２】
（実験例）
図６〜図９は従来形の実験コイル図であって図６は通常の１本の巻線４（ＣＡＳＥ１）、図７は直列巻線４（ＣＡＳＥ２）であり、図８は並列巻線４（ＣＡＳＥ３）、図９は同一並列巻線４で外側巻線４には導通せずに内側巻線４だけの導通もできるようなっている。図９で内側巻線にだけ導通させたものをＣＡＳＥ４とする。
【００１３】
このようにすると従来形のＣＡＳＥ１、２、３、４即ち図６〜図９では磁束１０が図１２〜図１５に示されるように集中し、かつ鍋の温度分布は図１８〜図２１に示すように鍋の中心から径方向に５０〜１００ｍｍ（直径１００〜２００ｍｍ）のところに熱が集中する。
【００１４】
ところが図５の場合或は図１１(イ) 図の場合は図１６に示すように中央部空間ｓ及び中間部空間ｓに設けた円形導体板２、２に磁束１０が発生して全体的に磁束１０の分散が計られていることがわかるし、中心部の加熱が従来のものに比べ強くなっていることがわかる。又図２２に示すように鍋中心から１００〜１５０ｍｍ程度の範囲で温度が平均化されている。これをＣＡＳＥ５とする。さらに図４の場合或は図１１(ロ) 図では図２３に示すように鍋表面の中心から１００ｍｍ程度の範囲で温度が均されていることがわかる。これをＣＡＳＥ６とする。
【００１５】
又図２４及び図２５では横軸にＣＡＳＥ１〜６におけるコイル電流及び消費電力を縦軸に示す。尚図１０中１１は軽量化用透孔、ａは渦電流の導通矢印、又、図１８〜図２３中右上小４角枠内の１０、２０、３０、４０なる数字は加熱スタートからの経過時間であって、その右側に経過時間に対応する符号を示す。
【００１６】
巻線の外周直径を約４００ｍｍのものとし６種類の巻線方法で実験を行い、それぞれをＣＡＳＥ１からＣＡＳＥ６までとした。
ＣＡＳＥ１〜４は従来形の実験図で図６〜図９であって、
ＣＡＳＥ１は図６に示したもので通常の１本の巻線４
ＣＡＳＥ２は図７に示したもので直列巻線４
ＣＡＳＥ３は図８に示したもので並列巻線４
ＣＡＳＥ４は図９(ロ) 図に示したものでＣＡＳＥ３と同じく並列巻線４でスイッチ９、９を開いて外部巻線４には導通せずに内側巻線４だけの導通もできるようになっている。内側巻線だけに導通させた場合をＣＡＳＥ４とする。
【００１７】
このように従来形のＣＡＳＥ１〜ＣＡＳＥ４では磁束１０が図１２〜図１５に示されるように集中し、かつ鍋の温度分布は図１８〜図２１に示すように鍋底の中心から半径５０〜１００ｍｍ（直径１００〜２００ｍｍ）のところに熱が集中する。
【００１８】
次にＣＡＳＥ５は図５に示したもの、即ち図１１(イ) 図の場合は図１６に示すように中央部空間ｓ及び中間部空間ｓに設けた円形導体板２、２に磁束１０が発生して全体的に磁束１０の分散が計られていることがわかるし、中心部の加熱が従来のものに比べ強くなっていることがわかる。又図２２に示すように鍋底中心から半径１００〜１５０ｍｍ程度の範囲で温度が平均化されている。
【００１９】
又ＣＡＳＥ６として図４に示したもので、即ち図１１(ロ) 図では図２３に示すように鍋表面の中心から１００ｍｍ程度の範囲で温度が均されていることがわかる。
【００２０】
又図２４はＣＡＳＥ１〜６の巻線で電圧を一定にした場合の励磁電流、図２５はその時の消費電力を縦軸に示す。尚図１０中１１は軽量化用透孔、ａは渦電流の導通矢印、図２４中Ｉ1 は内側電線電流、Ｉ2 は外側電線電流、図２５中Ｐ1 は内側巻線に励磁電流が流れたときの消費電力、Ｐ2 は外側に流れたときの消費電力、Ｐ1 ＋Ｐ2 は両者に流れたときの消費電力である。
【００２１】
【発明の効果】
本発明は上述のように構成したので簡単な円形導体板による磁束収束板を上述のように適用することによって調理用電磁誘導加熱において鍋の中の被加熱物の温度が均一化され、加熱調理を円滑に行うことができる。
【図面の簡単な説明】
【図１】 (イ) 図は本発明の電磁誘導加熱における渦電流収束型加熱装置を示す平面図である。
(ロ) 図は(イ) 図の縦断正面図である。
【図２】 (イ) 図は磁束収束板を２個用いた上記加熱装置の平面図である。
(ロ) 図は上記(イ) 図の縦断正面図である。
【図３】 (イ) 図は磁束収束板を外周に設けた平面図である。
(ロ) 図は(イ) 図の縦断正面図である。
【図４】 (イ) 図は中華鍋の加熱用巻線に磁束収束板を用いた平面図である。
(ロ) 図は(イ) 図の縦断正面図である。
【図５】 (イ) 図は中華鍋の加熱用巻線に磁束収束板を２個用いた平面図である。
(ロ) 図は(イ) 図の縦断正面図である。
【図６〜図９】 (イ) 図は従来の電磁誘導加熱鍋の縦断正面図である。
(ロ) 図は配線図である。
【図１０】磁束収束板の斜視図である。
【図１１】 (イ) 図は加熱用巻線の中央部空間と中間空間に上記収束板を設けた拡大縦断面図である。
(ロ) 図は加熱用巻線の中央空間に上記収束板を設けた拡大縦断面図である。
【図１２〜図１５】従来の磁束分布図である。
【図１６】図１１(イ) 図における磁束分布図である。
【図１７】図１１(ロ) 図における磁束分布図である。
【図１８〜図２１】図６〜図９における温度配分図である。
【図２２、図２３】図１１(イ)(ロ)及び図４、図５における温度分布図である。
【図２４、図２５】ＣＡＳＥ１、２、３、４、５、６におけるコイル電流と消費電力図である。
【符号の説明】
１ スリット
２ 円形導体板
３ 磁束収束板
４ 電磁誘導加熱用巻線
ｃ 中央部
ｎ 中間部
ｅ 外周部[0001]
[Industrial application fields]
The present invention relates to an eddy current convergence heating device in electromagnetic induction heating for cooking.
[0002]
[Prior art]
Conventionally, in electromagnetic induction heating used for cooking, magnetic flux concentrates on the part where the winding is concentrated, eddy current concentrates on the concentrated part, and the temperature of that part rises, flat pan, wok (arc-shaped pan) At any rate, the heat concentrates on the dense part of the winding part, and there is a problem that only the food in that part is scorched or the temperature at the center is low.
[0003]
Therefore, as shown in FIG. 7, FIG. 8, or FIG. 9, the method of dividing the winding from the state of FIG. However, as shown in FIG. 12 to FIG. Further, as shown in FIGS. 18 and 21, there is a problem that the heat concentration in a donut shape cannot be greatly improved.
[0004]
[Problems to be solved by the invention]
In the present invention, eddy currents are concentrated on the inner and outer periphery of a circular conductor plate having slits extending from the center to the outer periphery, whereby the concentration of magnetic flux based on the eddy current is also concentrated on the inner and outer periphery of the circular conductor plate. In view of No. 4-82162), the object is to adjust the temperature distribution of the object to be heated by the pan by dispersing or equalizing the concentration of magnetic flux due to the concentration of windings.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the electromagnetic induction heating, the present invention provides a magnetic flux converging plate formed by a longitudinally cross-sectionally grooved non-magnetic circular conductor plate having a slit extending from the center to the outer periphery, concentrically with the winding for electromagnetic induction heating. Using an eddy current converging heating device in electromagnetic induction heating in which the winding is accommodated in the groove of the circular conductor plate and the temperature distribution of the object to be heated is adjusted. Magnetic flux converging plate at the center of the winding for electromagnetic induction heating Eddy current convergence heating apparatus in electromagnetic induction heating according to the invention described above using an electromagnetic induction Electromagnetic induction according to the first or second invention, wherein a magnetic flux converging plate is used in an intermediate portion between a central portion and an outer peripheral portion of a winding for electromagnetic induction heating. Eddy current converging type heating device for heating The eddy current converging type heating device for electromagnetic induction heating according to the first, second, or third aspect of the present invention uses a magnetic flux converging plate at the outer periphery of the winding.
[0006]
[Action]
In the present invention, in the electromagnetic induction heating apparatus for cooking, a space having a slit extending from the central portion to the outer periphery in the space in the central portion of the winding for electromagnetic induction heating, the space formed in the middle portion between the central portion and the outer peripheral portion, or the outer peripheral portion. The conductor plate is arranged concentrically with the winding.
[0007]
A magnetic flux generated by conducting an alternating current through the winding generates an eddy current from the opposing surface of the slit of the circular conductor plate along the inner and outer peripheries of the conductor plate.
[0008]
Each of the eddy currents generates a magnetic flux to generate an eddy current in the cooking heat generating plate. Therefore, the eddy current in the cooking heat generating plate by the winding is dispersed by the magnetic flux generated by the eddy current in the circular conductor plate.
[0009]
【Example】
Cooking by placing a winding 4, 4 for electromagnetic induction heating via a ceramic plate 7 on the bottom of a flat bottom plate 6, a Chinese wok, a flat iron plate for steak, okonomiyaki or a heating flat plate 5 of a home electromagnetic cooker Form an electromagnetic induction heating device.
[0010]
In the windings 4 and 4, a space s is provided in the central portion c and an intermediate portion n between the central portion c and the outer peripheral portion e. Is formed by a non-magnetic circular conductive plate 2 a central through hole 8 drilled in the center, it has a slit 1 extending to the outer periphery of the transparent hole 8 as shown in FIG. 1 the solid line and 10 in central space s The magnetic flux concentrating plate 3 is arranged concentrically with the windings 4 and 4 as shown in FIGS.
[0011]
Further, it can be disposed only on the outer periphery as shown in FIG. 3, or in the central space s and the space s formed between the space s and the outer periphery e as shown in FIGS. The nonmagnetic circular conductor plate 2 has a longitudinal sectional groove shape as shown in FIGS. 1 to 5 and accommodates the winding 4 in the groove.
[0012]
(Experimental example)
6 to 9 are conventional experimental coil diagrams, in which FIG. 6 is a normal single winding 4 (CASE 1), FIG. 7 is a series winding 4 (CASE 2), and FIG. (CASE 3), FIG. 9 shows that the same parallel winding 4 is not connected to the outer winding 4, but only the inner winding 4 can be conducted. In FIG. 9, CASE 4 is the one that is conducted only to the inner winding.
[0013]
In this way, in conventional CASE 1, 2, 3, 4 or FIGS. 6-9, the magnetic flux 10 is concentrated as shown in FIGS. 12-15, and the temperature distribution of the pan is shown in FIGS. 18-21. Thus, heat concentrates in the place of 50-100 mm (diameter 100-200 mm) in the radial direction from the center of the pan.
[0014]
However, in the case of FIG. 5 or FIG. 11 (a), the magnetic flux 10 is generated in the circular conductor plates 2 and 2 provided in the central space s and the intermediate space s as shown in FIG. It can be seen that the dispersion of the magnetic flux 10 is measured, and that the heating of the central part is stronger than the conventional one. Moreover, as shown in FIG. 22, the temperature is averaged in the range of about 100 to 150 mm from the center of the pan. This is referred to as CASE5. Further, in the case of FIG. 4 or FIG. 11 (b), it can be seen that the temperature is leveled in the range of about 100 mm from the center of the pan surface as shown in FIG. This is CASE6.
[0015]
24 and 25, the horizontal axis represents the coil current and power consumption in CASE 1 to 6 on the vertical axis. In FIG. 10, 11 is a through hole for weight reduction, a is an eddy current conduction arrow, and numbers 10, 20, 30, and 40 in the upper right small square frame in FIGS. It is time and the code | symbol corresponding to elapsed time is shown on the right side.
[0016]
Experiments were carried out with six winding methods, with the outer diameter of the winding being about 400 mm, and each was designated as CASE 1 to CASE 6.
CASE 1 to 4 are conventional experimental diagrams and are FIGS.
CASE 1 is the one shown in FIG.
CASE 2 is the one shown in FIG.
CASE 3 is the one shown in FIG.
CASE 4 is shown in FIG. 9 (b). Like CASE 3, CASE 4 opens switches 9 and 9 with parallel winding 4 so that only internal winding 4 can be conducted without conducting external winding 4. ing. The case where only the inner winding is conducted is referred to as CASE4.
[0017]
Thus, in the conventional CASE1 to CASE4, the magnetic flux 10 is concentrated as shown in FIGS. 12 to 15, and the temperature distribution of the pan is 50 to 100 mm in radius from the center of the pan bottom as shown in FIGS. Heat concentrates at a diameter of 100 to 200 mm.
[0018]
Next, CASE 5 is as shown in FIG. 5, that is, in the case of FIG. 11 (a), as shown in FIG. 16, magnetic flux 10 is generated in circular conductor plates 2 and 2 provided in central space s and intermediate space s. As a result, it can be seen that the dispersion of the magnetic flux 10 is measured as a whole, and that the heating at the center is stronger than that of the conventional one. Further, as shown in FIG. 22, the temperature is averaged within a radius of about 100 to 150 mm from the center of the pan bottom.
[0019]
Further, as shown in FIG. 4 as CASE 6, that is, in FIG. 11 (b), it can be seen that the temperature is leveled within a range of about 100 mm from the center of the pan surface as shown in FIG.
[0020]
FIG. 24 shows the excitation current when the voltage is constant in the windings of CASE 1 to 6, and FIG. 25 shows the power consumption at that time on the vertical axis. In FIG. 10, 11 is a through hole for weight reduction, a is an eddy current conduction arrow, I 1 in FIG. 24 is an inner wire current, I 2 is an outer wire current, and P 1 in FIG. The power consumption when flowing, P 2 is the power consumption when flowing outward, and P 1 + P 2 is the power consumption when flowing to both.
[0021]
【The invention's effect】
Since the present invention is configured as described above, the temperature of the object to be heated in the pan is made uniform in the electromagnetic induction heating for cooking by applying the magnetic flux converging plate by a simple circular conductor plate as described above, and cooking is performed. Can be performed smoothly.
[Brief description of the drawings]
FIG. 1A is a plan view showing an eddy current convergence heating apparatus in electromagnetic induction heating according to the present invention.
(B) The figure is a longitudinal front view of (b).
FIG. 2A is a plan view of the heating device using two magnetic flux converging plates.
(B) The figure is a longitudinal front view of the figure (a).
3A is a plan view in which a magnetic flux converging plate is provided on the outer periphery. FIG.
(B) The figure is a longitudinal front view of (b).
FIG. 4 (a) is a plan view in which a magnetic flux converging plate is used for a heating winding of a wok.
(B) The figure is a longitudinal front view of (b).
FIG. 5 is a plan view in which two magnetic flux converging plates are used for the heating winding of the wok.
(B) The figure is a longitudinal front view of (b).
FIG. 6 to FIG. 9 (a) The figure is a longitudinal front view of a conventional electromagnetic induction heating pan.
(B) The figure is a wiring diagram.
FIG. 10 is a perspective view of a magnetic flux converging plate.
11A is an enlarged longitudinal sectional view in which the converging plates are provided in the central space and the intermediate space of the heating winding. FIG.
(B) The figure is an enlarged longitudinal sectional view in which the converging plate is provided in the central space of the heating winding.
12 to 15 are conventional magnetic flux distribution diagrams.
FIG. 16 is a magnetic flux distribution diagram in FIG.
FIG. 17 is a magnetic flux distribution diagram in FIG.
18 to 21 are temperature distribution diagrams in FIGS. 6 to 9; FIG.
22 and 23 are temperature distribution diagrams in FIGS. 11 (a) and 11 (b) and FIGS. 4 and 5. FIG.
24 and 25 are coil currents and power consumption diagrams in CASE 1, 2, 3, 4, 5, and 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Slit 2 Circular conductor plate 3 Magnetic flux converging plate 4 Electromagnetic induction heating winding c Central portion n Intermediate portion e Outer peripheral portion

Claims (4)

電磁誘導加熱において、中心部から外周に至るスリットを有する縦断面溝形非磁性円形導体板によって形成される磁束収束板を電磁誘導加熱用巻線に同心円に用い、上記円形導体板の溝内に巻線を収容して被加熱物の温度分布を調整してなる電磁誘導加熱における渦電流収束型加熱装置。In electromagnetic induction heating, a magnetic flux converging plate formed by a longitudinal-section groove-shaped non-magnetic circular conductor plate having a slit extending from the center to the outer periphery is used as a concentric circle for the electromagnetic induction heating coil , and the groove is formed in the groove of the circular conductor plate. An eddy current convergence type heating device in electromagnetic induction heating in which a winding is accommodated and the temperature distribution of an object to be heated is adjusted. 電磁誘導加熱用巻線の中央部に磁束収束板を用いた請求項(1) 記載の電磁誘導加熱における渦電流収束型加熱装置。The eddy current converging type heating apparatus in electromagnetic induction heating according to claim 1, wherein a magnetic flux converging plate is used at the center of the electromagnetic induction heating winding. 電磁誘導加熱用巻線の中央部と外周部との中間部に磁束収束板を用いる請求項(1) 又は(2) 記載の電磁誘導加熱における渦電流収束型加熱装置。The eddy current convergence type heating device in electromagnetic induction heating according to claim 1 or 2, wherein a magnetic flux converging plate is used at an intermediate portion between the central portion and the outer peripheral portion of the electromagnetic induction heating winding. 上記巻線の外周部に磁束収束板を用いる請求項(1) (2) 又は(3) 記載の電磁誘導加熱における渦電流収束型加熱装置。The eddy current converging type heating apparatus in electromagnetic induction heating according to claim 1, wherein a magnetic flux converging plate is used on an outer peripheral portion of the winding.
JP13602694A 1994-06-17 1994-06-17 Eddy current convergence type heating device in electromagnetic induction heating Expired - Lifetime JP3668260B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13602694A JP3668260B2 (en) 1994-06-17 1994-06-17 Eddy current convergence type heating device in electromagnetic induction heating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13602694A JP3668260B2 (en) 1994-06-17 1994-06-17 Eddy current convergence type heating device in electromagnetic induction heating

Publications (2)

Publication Number Publication Date
JPH088052A JPH088052A (en) 1996-01-12
JP3668260B2 true JP3668260B2 (en) 2005-07-06

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JP13602694A Expired - Lifetime JP3668260B2 (en) 1994-06-17 1994-06-17 Eddy current convergence type heating device in electromagnetic induction heating

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3595408A1 (en) * 2018-07-09 2020-01-15 Electrolux Appliances Aktiebolag Method for operating an induction hob and induction hob

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3595408A1 (en) * 2018-07-09 2020-01-15 Electrolux Appliances Aktiebolag Method for operating an induction hob and induction hob

Also Published As

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JPH088052A (en) 1996-01-12

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