US3906181A - Induction heating apparatus for minimizing vibration and noise - Google Patents

Induction heating apparatus for minimizing vibration and noise Download PDF

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Publication number
US3906181A
US3906181A US372610A US37261073A US3906181A US 3906181 A US3906181 A US 3906181A US 372610 A US372610 A US 372610A US 37261073 A US37261073 A US 37261073A US 3906181 A US3906181 A US 3906181A
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Prior art keywords
induction heating
circuit
excitation winding
current
accordance
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US372610A
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English (en)
Inventor
Masahiro Hibino
Toshio Ito
Masatami Iwamoto
Ikuko Nomura
Fukutaro Kishimoto
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Mitsubishi Electric Corp
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Mitsubishi Electric 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/33—Arrangements for noise damping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
    • Y10T117/10—Apparatus
    • Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
    • Y10T117/1076—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone
    • Y10T117/1088—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone including heating or cooling details

Definitions

  • ABSTRACT In an induction heating apparatus for induction heating a heated element by forming an alternating magnetic field, n groups (n 2) of magnetic circuits comprising said heated element are formed. The magnetic circuits are progressively excited by an excitation current having a phase difference in the range of X0.8 to X 1.2 degrees,
  • the present invention finds particular use with respect to an induction heating cooking apparatus run by standard line frequency current.
  • PATENIEDSEP Isms 3, 906. 1 81 sugar I 7 FIG.25 M 83 PATENTED SEP I 6 I975 SHEET 80A 1 LA FIG.28
  • This invention relates to an induction heating apparatus, and more particularly, to the magnetic and excitation current circuit structures of an induction heating apparatus excited by'a current of the standard line frequency.
  • An induction heating apparatus of the prior art heats a heated element by feeding an excitation current of the standard line frequency or the like to an exciter which forms an alternating magnetic field.
  • the heated element receives a high alternating electromagnetic force of twice the excitation current frequency, whereby the heated element will be severely vibrated and excessive noise will be caused.
  • the noise is quite severe, so much so that the practical application of such apparatus has been rather unsuccessful.
  • Another object of the present invention is to provide an induction heating apparatus for heating a heated element, such as a cooking pot, wherein the electromagnetic force vibrating in the vertical direction is reduced to substantially zero, especially with respect to an induction heating apparatus excited by a current of the standard line frequency, whereby the vibration of the heated element and the noise caused by such vibration are minimized.
  • an induction heating apparatus having an exciter for induction heating a heated element by forming an alternating magnetic field under the excitation of the commercial or standard line frequency, wherein n groups (n a 2) of substantially equivalent magnetic circuits which-comprises the exciter and the heated element are formed.
  • the magnetic circuits are excited progressively by an excitation current having a phase difference in the range between X 0.8 to II )1 whereby the alternating component of the electromagnetic force applied to the heated element is decreased or removed and the vibration and noise of the heated element will therefore be minimized.
  • the n groups of magnetic circuits are divided and each magnetic circuit is excited to form an opposing direction of magnetic field whereby the resultant rotating field will be decreased or removed as a whole so as to decrease or remove the rotating force applied to the heated element.
  • the distance between the heated element and the exciter and the material of the heated element are controlled so as to excite one mag- X l .2) degrees
  • FIGS. 1 to 9 show one embodiment of the induction heating apparatus in the form of cooking apparatus according to this invention wherein:
  • FIG. 1 is a sectional perspective view of the induction heating apparatus
  • FIG. 2 is a partially broken perspective view of the heated element (cooking pot);
  • FIG. 3 is a partially broken perspective view of the body (range table);
  • FIG. 4 is a partially schematic diagram of the exciter
  • FIGS. 5 to 7 are schematic views showing the structure of the excitation circuit of the exciter
  • FIG. 8 is a sectional view of the induction heating cooking apparatus showing the magnetic circuit
  • FIG. 9 is a schematic plan view of the bottom of a cooking pot showing the eddy currents formed therein;
  • FIGS. 10 to 14 are graphs showing various conditions of the electromagnetic force applied to the cooking pot, wherein each horizontal axis represents the time (in the same scale), and the vertical axes represent the current, magnetic flux and the electromagnetic force;
  • FIG. 15 is a characteristic curve of the static electromagnetic force applied to the cooking pot in the apparatus of this invention per ampere of the excitation current;
  • FIG. 16 is a characteristic curve of the calorific value of the cooking pot per ampere of the excitation-current
  • FIGS. 17 to 19 show another embodiment of the apparatus according to this invention wherein:
  • FIG. 17 is a perspective view of the bottom of a cooking pot
  • FIG. 18 is a perspective view of a body (range table).
  • FIG. 19 is a sectional view of the apparatus of FIGS. 17 and 18;
  • FIG. 20 is a partial schematic and partial perspective view of an exciter according to the invention.
  • FIG. 21 is a schematic of an excitation circuit of FIG. 20.
  • FIG. 22 is a partial schematic view of another embodiment of the exciter.
  • FIG. 23 is a schematic of an excitation circuit of FIG. 22;
  • FIG. 24 is a partial schematic view of another embodiment of the exciter.
  • FIGS. 25 and 26 are views of different excitation circuits of the apparatus in FIG. 24;
  • FIGS. 27 to 30 are views of different embodiments of the excitation circuit according to this invention.
  • FIGS. 31 and 32 are vector diagrams of the electric power used in the exciter
  • FIG. 33 is a perspective view of one embodiment of an iron core used for the exciter
  • FIGS. 34, 35 and 36 are perspective views of rela iron, magnetic pole and magnetic pole piece of the iron core used in this invention.
  • FIGS. 37 to 40 are perspective views of other embodiments of the iron core.
  • a metallic heated element (cooking pot) l typically comprises an iron cooking pot 11 having a copper or aluminum plate 12 bonded at the bottom.
  • the cooking pot can be an iron cooking pot or copper cooking pot, however it is preferable to use a cooking pot having a plied plate when it is excited by the standard line low frequency current, because of high heat efficiency and low vibration and noise.
  • the body of the apparatus (range table) has a cover plate coveringthe outer box 21.
  • the cover plate 30 supports the cooking pot l0 thereon and protects exciter 40 while maintaining a good appearance of the cooking apparatus.
  • a stainless steel plate or a reinforced glass plate, for example, having a high mechanical and thermal strength can be used as the cover plate 30.
  • the exciter 40 comprises an iron core 50 of a yoke 60, four magnetic poles 71-74, and four excita.
  • tion windings 81-84 wound on the four magnetic poles.
  • FIG. 5 illustrates one example of a connection between the excitation windings 81-84.
  • the excitation windings 81 and 83 on a pair of the magnetic poles 71 and 73 are connected in series to the electric power source to form one excitation circuit 80A.
  • the excitation windings 82 and 84 of the other pair of the magnetic poles 72 and 74 are connected in series to form the other excitation circuit 80B, to which a phase shift condenser C is connected.
  • the phases of the exciting currentsI and of both of the excitation circuits are designed to be about 90 out of phase with one other, so that the magnetic fluxes and Q having the polarities shown in FIG. 5 will be generated.
  • the symbols 9 and/or@ designate magnetic flux passing upwardly from the magnetic pole and the symbolsg' andlor designate magneticflux passing magnetic poles 71 and 73 and the cooking pot 10 form the magnetic circuit A.
  • the yoke 60, a pair of the magnetic poles 72 and 74 and the cooking pot 10 form the other magnetic circuit B.
  • the foregoing two magnetic circuits A and B are obviously equivalent to a single magnetic circuit having the same magnetic structure and the same resistance.
  • FIG. 8 illustrates in a sectional view the conditions of the magnetic flux passing through the magnetic circuits A and B.
  • the alternating magnetic flux 1 A or l B forms the magnetic circuit A or B passing from the magnetic pole 71 and 72 through the copper plate 12 of the bottom of the cooking pot, and the iron cooking pot 11, and the copper plate 12 to the other magnetic pole 73 or 74, as shown by the dotted line.
  • An eddy current is induced on the bottom of the cooking pot (mainly on the copper plate 12) by the alternating magnetic flux I A or D B, so that heating results by a Joule loss depending upon the resistance of the copper plate 12.
  • FIG. 9 illustrates the condition of the eddycurrent J formed on the bottom of the cooking pot by the alternating magnetic flux D and/or P
  • the electromagnetic force between the exciter 40 and the cooking pot 10 will now be considered with respect to excitation by one magnetic circuit A without the other magnetic circuit B.
  • the electromagnetic force is composed of two components. One component is a force on the boundary surface of the magnetic part 1 1 of the cooking pot l0, and is a force attracting the cooking pot 10 to the iron core 50.
  • the other component is the Lorenz force between the eddy current J passing on the bottom of thecooking pot and the exciting current passing through the excitation windings 81-84.
  • the eddy current has a phase difference of about from that of the exciting current. Accordingly, the Lorenz force will be a force lifting up th cooking pot 10 (a repulsive force).
  • FIGS. 10 to 14 illustrate various conditions of the electromagnetic force applied to the cooking pot 10.
  • the horizontal axis represents time (in the same scale) and the vertical axis represents current, the magnetic flux, or the electromagnetic force.
  • 1, represents an exciting current
  • FIG. 11 represents a magnetic flux and F represents an attractive force.
  • J represents an eddy current and F represents a repulsive force.
  • the attractive force F l is proportional to the square of the magnetic flux A and is changed in time at a frequency of twice the exciting current frequency.
  • the repulsive force F is proportional to the product of the exciting current I,, and the eddy current J, and is changed in time at a frequency of twice the exciting current frequency, the same as that of the attractive force F.
  • the total electromagnetic force F, applied to the cooking pot 1 0 is a combination of the attractive force F, and the repulsive force F
  • the frequency changed the electromagnetic force F is in a form which superimposes the static force with the alternating electromagnetic force and has a frequency of twice the current frequency.
  • the vibration acceleration produced thereby is higher than and the noise is higher than 70 horn and accordingly, such an arrangement could not be practically utilized.
  • the alternating electromagnetic force is theoretically zero, and only a constant static electromagnetic force is. applied to the cooking pot so that no vibration or no noise will be cause. In practical application, an induction heating cooking apparatus having negligible vibration and noise can be obtained.
  • the exciting current I A is directly fed from the power source to the excitation windings 81 and 83 of one excitation circuit 80A by turningon the switch 22.
  • the electric current I 1, sin (wt 1r/2), whose phase is shifted 90 in advance by condenser C is supplied to the excitation windings 82 and 84 of the other excitation circuit 808. Since the exciting current of the excitation circuits 80A and 80B have a phase difference of about 90, the magnetic fluxes D and 1 have a phase difference of about 90 between each other.
  • FIG. 14 illustrates the electromagnetic force in. the foregoing case.
  • the alternating electromagnetic force applied to the cooking pot by the alternating magnetic flux has a frequency of twice the magnetic flux frequency. Accordingly, a phase difference of about 180 exists between the electromagnetic forces F and F applied to the cooking pot 10 by the excitation circuits 80A and 80B. Since the magnetic resistances of the magnetic circuits A and B are the same, the absolute values of the magnetic fluxes 1 and D, are the same.
  • the total force applied to the cooking pot 10 will now be considered.
  • the alternating electromagnetic force based on the two excitation circuits 80A and 80B are cancelled, so that only the static force F (which is not changed in time) remains, as shown in FIG. 14.
  • the electromagnetic force for vertically vibrating the cooking pot will theoretically be zero in the induction heating cooking apparatus according to this invention. Accordingly, the vibration of the cooking pot and the noise due to the vibration will be remarkably decreased. According to our experiments, the vibration acceleration will be less than 0.1 G and the noise is less than 40 horn if the techniques of the present invention are utilized.
  • FIG. 15 illustrates the static electromagnetic force F of a practical induction heating apparatus equipped with an iron cooking pot (permeability p. r 5,000), a copper cooking pot and a copper-iron plied plate cooking pot.
  • the vertical axis represents the static electromagnetic force F per AT (ampere turn) of the exciting current;
  • the curves a, b, and c respectively represent the cases of the iron cooking pot, the copper cooking pot and the copper-iron plied plate cooking pot;
  • the horizontal axis represents the total thickness of the bottom of the iron cooking pot, the copper cooking pot or the thickness of the copper plate of the copper iron plied plate cooking pot, in the respective cases.
  • the thickness of the iron plate of the copper-iron plied plate is 2 mm; however, the electromagnetic force will not be affected when the thickness of the iron plate is higher than about 1 mm.
  • the electromagnetic force applied to the iron cooking pot is a relatively high attractive force
  • the electromagnetic force applied to the copper cooking pot is a repulsive force which is smaller than about one order when compared to that of the iron cooking pot;
  • FIG. 16 illustrates the calorific value per AT (ampere turn) of the exciting current when the iron cooking pot, the copper cooking pot, or the copper-iron cookingpot is used.
  • the horizontal axis is the same as that of FIG. 15, and the curves a, b and c are respectively for the iron cooking pot, the copper cooking pot and the copper-iron cooking pot. From the results of FIG. 16, it is clearly understood that the use of the copper-iron cooking pot is quite effective, because of the increase in the calorific value over the other two cases.
  • FIGS. 15 and 16 show characteristic data of specific structures, and similar characteristic data can be obtained when other practical structures are employed.
  • the electromagnetic force will be decreased.
  • the electromagnetic force applied to the cooking pot becomes smaller than the gravitational force on the cooking pot in the range of aluminum plate thickness of 2.1-2.7 mm; the electromagnetic force is zero at a plate thickness of 2.4 mm.
  • Similar phenomenon occur when other conductive materials are used, and can be applied, for example, for a cooking pot prepared by bonding a ferromagnetic plate to non-magnetic plate having a higher conductive coefficient than that of the ferromagnetic plate.
  • the magnetic field formed by the exciter 10 causes a rotating field so that a rotating force will be applied to the cooking pot 10.
  • rotation of the cooking pot can be prevented by the following methods.
  • One of such methods is to retain a suitable attractive force without decreasing the static magnetic force F applied to the cooking pot 10, whereby the rotation of the cooking pot 10 will be prevented by the remaining attractive force. Moreover, the cooking pot 10 will not slip when the range table becomes inclined.
  • Another method is to prevent the rotation of the cooking pot 10 by means of a mechanical structure.
  • a mechanical structure For example, as shown in the embodiments in FIGS. 17 to 19, three projections 13 are formed at the bottom of the cooking pot and corresponding three concave receptacles 31 are formed on the cover plate 30 of the range table 20 in a fitting relationship to each other.
  • the rotation of the cooking pot 10 can be prevented in such a manner so that the'static electromagnetic force F will be zero and the vibration and noise will be quite small.
  • FIG. 20 is a schematic view of another embodiment of the exciter according to this invention, wherein the exciter comprises six magnetic poles 71-76 of the iron core 50.
  • the windings 81-86 are respectively wound on each of the six magnetic poles 71-76.
  • the magnetic circuits formed by the iron core 50 and the cooking pot 10 are divided into three equiva lent magnetic circuits A, B and C.
  • each pair of windings 81 and 84, 82 and 85, and 83 and 86 are respectively connected to form each of the excitation circuits 80A, 80B and 80C.
  • Alternating currents having a phase difference of 60 such as I,, sin wt, I, sin (wt Va 11'), and I sin (wt 2/31T), are respectively supplied to the corresponding excitation circuits to excite them.
  • the alternating electromagnetic force applied to the cooking pot 10 will be approximately zero. This follows from a reconsideration of FIG. 13 which shows the change in time of the electromagnetic force applied to the cooking pot 10 by the .three'magnetic circuits A, B and C.
  • the electromagnetic forceof the three magnetic circuits each have a phase'shift of 120. When they are combined, the alternating electromagnetic forces are cancelled so as to be zero, and only the static electromagnetic force remains.
  • FIG. 22 is a schematic view of another embodiment of the exciter having eight magnetic poles.
  • Eight excitation windings 81-88 wound respectively on the eight magnetic poles 7 l-78 are divided into two groups 81, 83, 85 and 87; and 82, 84, 86 and 88-so as to form two excitation circuits 80A and 808 as shown in FIG. 23.
  • Alternating currents having a phase shift of about 90, such as I, sin wt and I cos wt are respectively supplied to the excitation circuits 80A and 803.
  • the relative directions of the magnetic flux are shown as I A and 1 B in FIG. 22. It is clear from the description above that the same effect occurs in the present embodiment as in the embodiment of FIG. 20.
  • an exciter having 4, 6 or 8 magnetic poles have been illustrated.
  • the same effect can be achieved by an exciter having many magnetic poles by dividing the magnetic circuit into two or three groups of equivalent magnetic circuits formed by the magnetic poles and the cooking pot, and by providing a phase difference of 90 or between the currents exciting each of the magnetic circuits.
  • an induction heating cooking apparatus forming magnetic circuits between an iron core and a cooking pot, it is possible to obtain a zero component of electromagnetic force for vertically vibrating the cooking pot by dividing the magnetic circuits into n equivalent magnetic circuits having the same structure and same magnetic resistances by providing a phase difference of lln between the alternating currents exciting the divided magnetic circuits.
  • the vibrating acceleration was made lower than 1 G, which is lower than the weight of the cooking pot. Under such latitude, an allowance of about i 20% of phase difference deviation can be considered. According to our experiments, the vibrating acceleration was lower than 1 G with a calorific value of 1 KW when the phase difference was deviated 20%.
  • FIG. 24 is a schematic view of another embodiment of the improved exciter according to this invention.
  • the structure of this embodiment is same as the embodiment of FIG. 22, except in the connection of the windings.
  • FIG. 25 illustrates a connection of the ,excitation circuit which prevents a rotating field, wherein an alternating current source is connected between an initial end of the winding 81 and an initial end of the winding 87 and, for example, an excitation current having I I sin wt is applied.
  • an alternating current source having a phase shift of about is connected between an initial end of the winding 82 and an initial end of the winding 88 and, for example, an excitation current having I 1,, cos wt is applied.
  • an excitation current having I 1,, cos wt is applied.
  • a rotating magnetic field applied to the cooking pot by the excitation current will not be formed.
  • an electromagnetic force for vertically vibrating the cooking pot will not be formed. This is because that when the magnetic field is shifted progressively to the windings 81-88-87-86, the magnetic field will simultaneously be shifted to the opposite direction of the windings of 82-83-84-85,'and
  • FIG. 26 illustrates the other connection of the other excitation circuit for the same purpose. In the induction heating cooking apparatus, both of the rotating forces are cancelled by each other.
  • FIGS. 27 to 30 illustrate another embodiment of the phase shift excitation according to this invention, wherein an excitation circuit 80A for one magnetic circuit A and an excitation circuit 80B for the other magnetic circuit B are equivalent to each other.
  • the condensers C A and C B are respectively connected in series to the excitation circuits 80A and 808, the condensers C and C are respectively connected in parallel to the excitation circuits 80A and 80B, and the reactor L is connected in series to the excitation circuit 80A.
  • the reference V represents the electrode voltage
  • 1,, and I respectively represent the current fed to the excitation circuits 80A and 808.
  • the phase of the current I A fed to the excitation circuit 80A lags the voltage from the power source voltage V by 45.
  • the resistive component of the excitation circuit 80A is equal'to the reactance component thereof.
  • a reactor L is connected in series as shown in FIG. 28 to attain the same result.
  • a condenser C A is connected in series as shown in FIG. 29, to attain the same result.
  • the condenser C of the excitation circuit 808 is selected so that the phase of the current 1,; leads the power source voltage V by 45.
  • a similar function can be attained by the embodiments shown in FIG. 30.
  • FIG. 31 shows a power vector diagram for illustrating the characteristics of the exciters having a phase difference angle other than 45 between the ter minal voltage and current of the excitation circuits of FIGS. 27 to 30.
  • the vertical axis represents the effective power component and the horizontal axis represents the ineffective power component, and the references P and P respectively represent the effective power fed to the excitation circuits 80A and 80B.
  • the effective power P should be equal to P
  • the phase shift between the electric currents I and I must be 90. Accordingly, the phase difference between the complex powers T and T must be 90.
  • the reference Q represents the ineffective power of the condenser C connected in series to the excitation circuit 803 so as to be 90 of the phase difference between the complex powers T and T
  • FIG. 32 shows a power vector diagram according to this invention.
  • the electric current 1,, fed to the excitation circuit 80A has a phase difference of lagging the terminal voltage.
  • the resistive component of the excitation circuit when the resistive component of the excitation circuit is equal to the reactance component by selecting the space between the iron core surface and the bottom of the cooking pot, and the material of the cooking pot, the additional part required for the circuit of this invention is only one condenser. This provides various advantages in that the apparatus can be compact, the power source equipment can be simplified, and the cost of manufacture can be decreased.
  • FIG. 33 illustrates one embodiment of the iron core having four magnetic poles.
  • the iron core has a ring-type winding iron core prepared by winding a ferrosilicon plate in a coil shape and by forming a winding holder by cutting grooves as shown in the drawing.
  • the windings 81 to 84 are wound on the grooves 51.
  • the direction of the plies of the ferrosilicon plate is arranged so as to oppose the passage of the eddy current, so that the iron core loss can be minimized.
  • the core of FIG. 33 is advantageously formed from one piece.
  • Iron cores formed by an assembly of a separately prepared yoke, magnetic poles and if necessary a magnetic pole piece, will now be illustrated.
  • FIG. 34 illustrates various yokes, wherein the reference numeral a designates an annular yoke made of ferrite;
  • 60b designates an annular yoke made of ferrite
  • 60c designates a square plate yoke made of ferrite
  • 60d designates a square ring yoke made of ferrite
  • 60d designates a yoke of cross-shape made of plied ferrosilicon plate
  • 60f designates a yoke of cross-shape made of ferrite.
  • FIG. 35 illustrates various magnetic poles wherein the reference numeral a designates a sector magnetic pole of plied steel plate
  • 70b designates a sector magnetic pole of ferrite
  • 70c designates a square magnetic pole of plied steel plate
  • 70d designates a square magnetic pole of ferrite
  • 70e designates-a cylindrical magnetic pole of ferrite.
  • FIG. 36 illustrates various magnetic pole pieces wherein the reference numeral 90a designates a sector magnetic pole piece of ferrite
  • 90b designates a square magnetic pole piece of ferrite
  • 900 designates a cylindrical magnetic pole piece of ferrite.
  • FIG. 37 shows one embodiment of an assembly comprising the annular yoke 60a of FIG. 34, sector magnetic pole 70a of FIG. 35 and the magnetic pole piece 90a of FIG. 36, which are bonded together.
  • FIG. 38 shows another iron core assembly comprising the annular yoke 60a of FIG. 34, and the sector magnetic pole of ferrite 70b of FIG. 35.
  • FIG. 39 shows still another assembly comprising the annular yoke 60a of FIG. 34, and the cylindrical magnetic pole of ferrite 70e of FIG. 35.
  • FIG. 40 shows another assembly comprising the yoke of cross-plied plate 70d of FIG. 35, and the reference numeral 100 designates a non-magnetic part having a high resistivity which is placed on one side of the magnetic pole 70d to seal the magnetic flux passing through the surface to decrease the iron core loss.
  • Induction heating appliance comprising:
  • said exciter comprising,
  • Induction heating appliance in accordance with claim 1 further including a cover plate covering said first, second, third and fourth windings.
  • Induction heating appliance comprising:
  • said exciter comprising a first magnetic pole having a first excitation winding I disposed adjacent to said element, a second magnetic pole having a second excitation winding disposed adjacent to said element, I
  • a sixth magnetic pole having a sixth excitation wind ing disposed adjacent to said element, means connecting said first excitation winding to said fourth excitation winding to form a first circuit
  • Induction heating appliance in accordance with claim 10 further including a cover plate covering said first, second, third, fourth, fifth and sixth windings.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)
  • General Induction Heating (AREA)
US372610A 1972-08-18 1973-06-22 Induction heating apparatus for minimizing vibration and noise Expired - Lifetime US3906181A (en)

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JP47082604A JPS5217572B2 (de) 1972-08-18 1972-08-18

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US (1) US3906181A (de)
JP (1) JPS5217572B2 (de)
CA (1) CA1014228A (de)
DE (1) DE2332049C3 (de)
FR (1) FR2196568B1 (de)
GB (1) GB1437973A (de)
IT (1) IT991094B (de)

Cited By (18)

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US3980858A (en) * 1973-08-22 1976-09-14 Mitsubishi Denki Kabushiki Kaisha Exciter for induction heating apparatus
US4308443A (en) * 1979-05-01 1981-12-29 Rangaire Corporation Induction cook-top with improved touch control
US4374516A (en) * 1979-11-26 1983-02-22 Harrison William H Planar disc magnetic electrode
US4453068A (en) * 1979-05-01 1984-06-05 Rangaire Corporation Induction cook-top system and control
US4736082A (en) * 1987-04-07 1988-04-05 Kabushiki Kaisha Toshiba Electromagnetic induction heating apparatus capable of preventing undesirable states of cooking utensils or vessels
US4792652A (en) * 1986-12-10 1988-12-20 Electricite De France - Service National Electric induction cooking appliance with reduced harmonic emission
US4999467A (en) * 1989-01-23 1991-03-12 Nikko Corporation Ltd. Low-frequency electromagnetic induction heater
US5053593A (en) * 1989-01-23 1991-10-01 Nikko Corporation Ltd. Low-frequency electromagnetic induction heater
US5134265A (en) * 1990-02-16 1992-07-28 Metcal, Inc. Rapid heating, uniform, highly efficient griddle
US5227597A (en) * 1990-02-16 1993-07-13 Electric Power Research Institute Rapid heating, uniform, highly efficient griddle
US5843228A (en) * 1996-04-09 1998-12-01 Mitsubishi Materials Silicon Corporation Apparatus for preventing heater electrode meltdown in single crystal pulling apparatus
US5879452A (en) * 1996-01-25 1999-03-09 Ferrofluidics Corporation Czochralski crystal growth system with an independently supported pull head
US20090020526A1 (en) * 2005-12-27 2009-01-22 Fagorbrandt Sas Induction device comprising multiple individual coils for induction heating plates
US20130112684A1 (en) * 2011-09-21 2013-05-09 E.G.O. Elektro-Geratebau Gmbh Induction Heating Device and Induction Hob with Induction Heating Devices
US20140054283A1 (en) * 2011-04-05 2014-02-27 Comaintel Inc. Induction heating workcoil
US20140290833A1 (en) * 2011-10-28 2014-10-02 Compagnie Generale Des Etablissements Michelin Tire vulcanizing press comprising induction heating means
US10959568B2 (en) * 2018-02-09 2021-03-30 Patrick M. Tweel Inductive heating vessels and methods of making and using same
GB2596549A (en) * 2020-06-30 2022-01-05 Dyson Technology Ltd A foodstuff preparation device

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JPS50114637A (de) * 1974-02-21 1975-09-08
JPS5845834Y2 (ja) * 1980-12-13 1983-10-18 株式会社 設楽製作所 缶の内部洗浄機
AU615132B2 (en) * 1989-01-23 1991-09-19 Nikko Corporation Ltd. Low-frequency electromagnetic induction heater
JPH04230987A (ja) * 1990-06-18 1992-08-19 Nikko Kk 電磁誘導加熱器
EP3324703B1 (de) * 2016-11-18 2024-08-07 Kendrion Kuhnke Automation GmbH Induktionsheizeinrichtung für industrielle zwecke

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US3275784A (en) * 1962-08-09 1966-09-27 Hoover Co Induction heating coil
US3382311A (en) * 1964-06-18 1968-05-07 Asea Ab Low frequency induction melt plant
US3530499A (en) * 1969-09-29 1970-09-22 Charles F Schroeder Electrically heated appliance unit

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US2001219A (en) * 1933-07-01 1935-05-14 Harold N Shaw Heating device
US3275784A (en) * 1962-08-09 1966-09-27 Hoover Co Induction heating coil
US3382311A (en) * 1964-06-18 1968-05-07 Asea Ab Low frequency induction melt plant
US3530499A (en) * 1969-09-29 1970-09-22 Charles F Schroeder Electrically heated appliance unit

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980858A (en) * 1973-08-22 1976-09-14 Mitsubishi Denki Kabushiki Kaisha Exciter for induction heating apparatus
US4308443A (en) * 1979-05-01 1981-12-29 Rangaire Corporation Induction cook-top with improved touch control
US4453068A (en) * 1979-05-01 1984-06-05 Rangaire Corporation Induction cook-top system and control
US4374516A (en) * 1979-11-26 1983-02-22 Harrison William H Planar disc magnetic electrode
US4792652A (en) * 1986-12-10 1988-12-20 Electricite De France - Service National Electric induction cooking appliance with reduced harmonic emission
US4736082A (en) * 1987-04-07 1988-04-05 Kabushiki Kaisha Toshiba Electromagnetic induction heating apparatus capable of preventing undesirable states of cooking utensils or vessels
US4999467A (en) * 1989-01-23 1991-03-12 Nikko Corporation Ltd. Low-frequency electromagnetic induction heater
US5053593A (en) * 1989-01-23 1991-10-01 Nikko Corporation Ltd. Low-frequency electromagnetic induction heater
US5134265A (en) * 1990-02-16 1992-07-28 Metcal, Inc. Rapid heating, uniform, highly efficient griddle
US5227597A (en) * 1990-02-16 1993-07-13 Electric Power Research Institute Rapid heating, uniform, highly efficient griddle
US5879452A (en) * 1996-01-25 1999-03-09 Ferrofluidics Corporation Czochralski crystal growth system with an independently supported pull head
US5843228A (en) * 1996-04-09 1998-12-01 Mitsubishi Materials Silicon Corporation Apparatus for preventing heater electrode meltdown in single crystal pulling apparatus
CN1106460C (zh) * 1996-04-09 2003-04-23 三菱麻铁里亚尔硅材料株式会社 防止单晶拉制设备中加热器电极熔化下坠的设备
US20090020526A1 (en) * 2005-12-27 2009-01-22 Fagorbrandt Sas Induction device comprising multiple individual coils for induction heating plates
US20140054283A1 (en) * 2011-04-05 2014-02-27 Comaintel Inc. Induction heating workcoil
US20130112684A1 (en) * 2011-09-21 2013-05-09 E.G.O. Elektro-Geratebau Gmbh Induction Heating Device and Induction Hob with Induction Heating Devices
US9144116B2 (en) * 2011-09-21 2015-09-22 E.G.O. Elektro-Gerätebau GmbH Induction heating device and induction hob with induction heating devices
US20140290833A1 (en) * 2011-10-28 2014-10-02 Compagnie Generale Des Etablissements Michelin Tire vulcanizing press comprising induction heating means
US9757915B2 (en) * 2011-10-28 2017-09-12 Compagnie Generale Des Etablissements Michelin Tire vulcanizing press comprising induction heating means
US10959568B2 (en) * 2018-02-09 2021-03-30 Patrick M. Tweel Inductive heating vessels and methods of making and using same
GB2596549A (en) * 2020-06-30 2022-01-05 Dyson Technology Ltd A foodstuff preparation device
GB2596549B (en) * 2020-06-30 2022-10-19 Dyson Technology Ltd A foodstuff preparation device

Also Published As

Publication number Publication date
CA1014228A (en) 1977-07-19
FR2196568A1 (de) 1974-03-15
GB1437973A (en) 1976-06-03
JPS4938233A (de) 1974-04-09
DE2332049A1 (de) 1974-02-28
FR2196568B1 (de) 1976-04-30
JPS5217572B2 (de) 1977-05-17
DE2332049B2 (de) 1978-08-31
DE2332049C3 (de) 1979-05-10
IT991094B (it) 1975-07-30

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