KR0127476B1 - Induction heating coil structure - Google Patents

Abstract

The induction heating coil is comprised of the step of pressing evenly both a helical litz wire and a gauze type litz wire, wherein the helical litz wire being twisted in one direction, the gauze type litz wire of a circular cylinder twisted with the helical litz wire being twisted in an opposite direction thereto, and the step of winding to as large diameter as necessary in a form of a snail. When applying a current to a first and a second litz wire(41,42) in a same direction, a magnetic filed(H1) is generated at the first helical litz wire(41) in one direction, while another magnetic filed(H2) is generated at the second helical litz wire(42) in another direction opposite to the direction of the magnetic field(H1). These two magnetic fields(H1,H2) cancel each other, thereby the eddy current, which is induced from an electromotive force which is generated by change in the magnetic flux of the two magnetic fields(H1,H2), being not generated.

Description

Structure and method for increasing heating of induction heating coil of electronic cooker

1 is a cross-sectional view showing the principle of the electronic cooker.

2 is a state diagram used in the conventional induction heating coil.

3 is a perspective view showing the structure of a conventional induction heating coil.

4 is a waveform diagram showing a current and an electric field of a conventional induction heating coil.

5 is a state diagram using the induction heating coil of the present invention.

6 is a partially enlarged view showing the structure of the induction heating coil of the present invention.

7 is a waveform diagram showing the current and the electric field of the induction heating coil of the present invention.

* Explanation of symbols for main parts of the drawings

2: ceramic plate 3: induction heating coil

4: spiral ritz wire 5: mesh ritz wire

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil used for induction heating in an electronic cooker, and in particular, by twisting spiral litz wires twisted in opposite directions to prevent eddy currents from occurring in the litz wire. The present invention relates to a structure and a method for increasing heating of an induction heating coil of an electronic cooker capable of increasing efficiency.

Generally, as shown in FIG. 1, when an alternating current flows through an induction heating coil 3 under a ceramic plate for placing a pot, magnetic lines are generated and the metal (pot) of the magnetic cooker (1) The eddy current flows in and the Joule heat is generated by the eddy current and the electrical resistance of the metal, so that the metal (pot) 1 is heated.

For example, as the induction heating coil 3 of the electronic cooker, as shown in FIGS. 2 and 3, a spiral ritz wire (Litz wire) 4 in which a plurality of copper wires are twisted in one direction is used. The cylindrical spiral line 4 was pressed flat and wound to the required diameter in a snail shape (orchard). When an alternating current flows through the spiral Litz wire 4, as shown in FIG. 4, the magnetic field H is swelled in one direction, and the long-term magnetic field H is caused by the alternating current flowing through the spiral Litz wire 4 Since the magnetic flux changes, electromotive force is generated in accordance with Lands' law. When the electromotive force is generated, a spiral current, that is, an eddy current, is generated in the spiral litz wire 4, and a power loss is generated by the eddy current.

The spiral Litz wire 4 used as the induction heating coil of the conventional electronic cooker has a problem in that a eddy current is generated in the spiral Litz wire itself when an alternating current flows, causing a lot of power loss.

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems as described above, and to prevent eddy curren from occurring in the litz wire by twisting spiral litz wires intertwined with each other. An object of the present invention is to provide a structure of a method and a method of increasing heating of an induction heating coil of an electronic cooker capable of increasing efficiency.

Hereinafter, the technical configuration of the present invention in detail.

As shown in FIGS. 5 and 6, the structure of the induction heating coil of the electronic cooker flattens the spiral Litz wire twisted in one direction and the spiral Litz wire twisted in the opposite direction. It is then characterized by its technical construction, which is wound up to the required diameter in the shape of a snail (orchard).

As shown in FIG. 7, the structure of the induction heating coil of the electronic cooker according to the present invention has the first spiral LITZ line 41 when an alternating current is applied to the first and second spiral LITZ lines 41 and 42 in the same direction. The magnetic field H1 is generated in one direction, and the magnetic field H2 is generated in the second spiral litz wire 42 in a direction opposite to the magnetic field H1, so that the long term two magnetic fields H1 and H2 cancel each other out. Since no eddy current caused by electromotive force generated by the magnetic flux changes of the two magnetic fields H1 and H2 is generated, power loss due to eddy currents is conventionally prevented.

Therefore, as shown in FIG. 1, when the induction heating coil 3 under the ceramic plate for placing the pot is replaced with the mesh type litz wire 5 of the present invention and an alternating current is applied, the mesh type litz wire (5) The magnetic field (H1) acting on one side and the magnetic field (H2) acting on the other side cancel each other so that no eddy current is generated, thereby preventing power loss due to eddy current.

In addition, a certain diameter wound around the snail shape generates more current by the amount of power loss due to the eddy current generated in the conventional Litz wire itself, resulting in more magnetic lines than the conventional magnetic lines. (1) Below, eddy current flows more than before. The increased eddy current and the electrical resistance of the metal generates more heat than conventional heat, and as a result, the metal (pot) 1 is heated, and thus the heating efficiency is higher than that of the conventional induction heating coil helical Litz wire.

As described above, the structure of the induction heating coil of the present invention cooks twisted spiral Litz wires in opposite directions to prevent eddy currents from occurring in the Litz wires. It is effective to increase efficiency.

Claims (3)

In the coil used for the induction heating of the electronic cooker, the heating of the induction heating coil of the electronic cooker is configured to have a predetermined diameter by twisting the LITZ wires formed by sequentially crossing and twisting each other. rescue. Induction heating coil of electronic cooker, heating of induction heating coil of electric cooker, characterized by flattening flattened Lutz wire formed by twisting litz wires formed by a plurality of copper wires in order to cross each other. How to increase. In the high frequency melting using the Litz wire to reduce the resistance generation effect due to the effect of the skin effect according to claim 1 and 2, distortion caused by unnecessary magnetic field when forming a group line of a plurality of copper wires Increasing the heating of the induction heating coil of the electronic cooker to suppress the.