JPH11127559A - Ac energy converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce housing space and cost of an AC energy converter by providing a plurality of cored coils formed through windings having loss DC resistances at regular intervals on the circumferential surface of a magnetic pedestal, and rotating and heating a rotary plate by means of the same cored coil. SOLUTION: A rotary plate 7 made of a soft magnetic metal is rotated and heated by using an AC energy converter, in which a magnetism generating mechanism section 1 and a container 2 housing a rotationally driven section are provided separately and independently. Therefore, the plate 7 can be rotated by induced heating through the use of a coil 3 for rotational driven and induction heating in such a way that, in rotating the plate 7, the plate 7 is rotationally driven in two phases of 'Sin' 'Cos' by adjusting the impressed frequency to 150-600 Hz in the case of a two-phase inverter circuit. At heating of the plate 7, the electric power is supplied by unifying the phases by switching either one of the phases of 'Sin' and 'Cos' to the other phase, and at the same time, by making the impressed frequency equal to or higher than the rotationally driven frequency. Therefore, the housing area and the cost of the AC energy converter can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating current energy converter, which uses a rotary drive coil to generate a rotating magnetic field during rotation, and switches and in-phase the coil to generate an alternating magnetic field during heating, thereby providing a soft magnetic field. The present invention relates to an AC energy converter that can also serve as an induction heating function in addition to a rotation function capable of generating heat by induction heating of a rotating plate made of a metal material and a composite material thereof, and a rotatable warmer, a cooking pot, Applications such as scientific equipment are possible.

[0002]

2. Description of the Related Art Conventionally, a heating and rotating function of an AC energy converter in which a magnetic generating mechanism and a rotation driving unit are separated and independent has been disclosed in Japanese Patent Application No. 8-2801, filed by the present inventors.
As shown in FIG. 39, the rotating magnetic field generating coil and the high frequency induction heating coil were arranged on the outermost periphery of the rotating magnetic field generating coil and were driven by respective power supplies. However, coils corresponding to the respective applications were arranged. Therefore, there is a problem that the accommodation area is large and the cost is high.

An object of the present invention is to provide a small and low-cost AC energy converter that can be heated by a rotating magnetic field generating coil in order to solve the above-mentioned drawbacks and reduce the housing area and cost, which have been problems in the past. Is provided.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems.
In the AC energy converter according to the present invention, in a AC energy converter in which a magnetic generating mechanism and a container having a rotation drive unit inside are separated and independent, the magnetic generating mechanism is a flat donut-shaped magnetic pedestal. A plurality of cored coils wound from low DC resistance windings are provided at regular intervals on the circumferential surface of the magnetic pedestal, and the rotation drive and induction heating are performed by the same cored coil. Is performed.

According to a second aspect of the present invention, there is provided the AC energy converter according to the first aspect, further comprising a two-phase or three-phase inverter circuit, and a two-phase inverter having a phase difference of 90 degrees when rotating. Driving or three-phase driving with a phase difference of 120 degrees is performed, and the phase is changed to an alternating magnetic field generation method during heating, and the applied frequency is set to be equal to or higher than the rotation frequency.

According to a third aspect of the present invention, there is provided an AC energy converter according to the first or second aspect, wherein a plurality of wires are bundled into one to form a cored coil of 0.2Ω or less per coil. It is formed with low DC resistance.

In the AC energy converter according to a fourth aspect of the present invention, in the AC energy converter according to any one of the first to third aspects, the container provided with the rotary drive unit is made of a nonmagnetic heat-resistant material. (Eg glass, heat-resistant resin,
The inner bottom surface of the container is provided with a guide groove for a rotating sphere along the circumference.

In the AC energy converter according to a fifth aspect of the present invention, in the AC energy converter according to any one of the first to fourth aspects, the rotating mechanism provided in the container can be easily attached and detached. And a rotating plate made of a soft magnetic metal material (for example, iron, iron-based metal, a composite material of perforated aluminum and iron, etc.), and a circumferential surface within the rotating plate surface. At least three or more freely rotating rotating balls are provided at equal intervals and arranged so as to be in contact with the guide grooves on the bottom surface inside the container, and the rotating balls are made of a non-magnetic or non-metallic material (eg, glass, ceramic, etc.). ).

In the AC energy converter according to a sixth aspect of the present invention, in the AC energy converter according to any one of the first to fifth aspects, the magnetic generating mechanism portion that is used for both rotary driving and induction heating includes: In particular, in order to suppress the self-heating caused by the induction heating, the magnetic core material of the cored coil and the material of the magnetic pedestal disposed underneath are made of a ferrite material (for example, Mn-Zn, Ni-Zn-related) having good high-frequency characteristics. Used.

According to a seventh aspect of the present invention, there is provided the AC energy converter according to any one of the first to sixth aspects, wherein the rotary drive and the induction heating are switched to a single mode, or both. It has a configuration having time-division driving means in the dual-purpose mode.

[0011]

According to the present invention, in order to reduce the accommodating area and cost, which have conventionally been problems, the present inventors have focused on the magnet generating coil and the driving conditions, and have found a method in which heating can be performed by the rotating magnetic field generating coil. That is, in the case of a two-phase inverter circuit during rotation using a rotation drive coil, the applied frequency is 150 Hz to 6 Hz.
00 Hz, and rotationally driven by two phases of Sin and Cos. At the time of heating, one of Sin and Cos is switched to be in phase, power is supplied, and the applied frequency is made equal to or higher than the rotational drive frequency, thereby soft magnetic. A rotating plate made of a metal material can also be heated by induction heating.

[0012] Then, in order to improve the heating efficiency, 10 or more thin wires of the coil diameter are bundled and twisted and formed into one wire so as to have a low DC resistance equal to or less than that of the thick wire. By configuring the coil, heating and rotation can be electrically switched by the same coil.

Further, in order to improve the heating efficiency, the magnetic material of the magnetic circuit of the rotor-side exciting coil is made of a ferrite material having good high-frequency characteristics (for example, Mn-Zn, Ni-Zn, etc.) to generate heat on the stator side. Above the audible frequency at which the rotating plate is more likely to induce eddy current loss (in this case, 20 KHz to 3
(0 KHz) Since a high-frequency current was applied, the accommodation area was greatly improved, and the production cost could be reduced. still,
As the ferrite used here, Mn-Zn ferrite was used for the magnetic core material of the cored coil and the magnetic pedestal on the bottom surface of the coil group.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention.
1 is a schematic cross-sectional view of an AC energy converter. In a configuration in which a magnetic generating mechanism unit 1 and a container 2 having a rotation driving unit are separated and independent from each other, a magnetic driving mechanism unit 1
Induction heating combined coil 3, rotational drive-induction heating combined coil 3 at the center, magnetic core 4 made of ferrite material Rotation drive-induction heating combined coil 3 and magnetic core 4 underneath A magnetic pedestal 5 made of a material, particularly a ferrite material, is provided, and the whole is accommodated in a storage case 6 to constitute a magnetic generation mechanism.

FIG. 2 is a diagram showing a schematic plan view and a schematic cross-sectional view of a container 2 provided with a rotation drive unit. The container 2 is made of a non-magnetic non-metallic material (eg, glass, heat-resistant resin, stainless steel, etc.). And a rotation guide groove a of a rotating plate is provided along the circumference on the inner bottom surface of the container. The rotating plate 7 provided in the container 2 is made of a soft magnetic metal material (for example, iron, an iron-based metal, or a composite material of perforated aluminum and iron), and freely rotates along the circumference in the plane of the rotating plate 7. Rotating spheres 8 are provided at at least three locations at equal intervals (every 120 degrees). The sphere is arranged so as to be in contact with the rotation guide groove a provided on the inner bottom surface of the container, and is made of a nonmagnetic nonmetal material such as a glass sphere or a ceramic sphere.

FIG. 3 shows a schematic plan view and a schematic cross-sectional view of only the container from which the rotation drive unit has been removed, and FIG. 4 shows a schematic plan view and a schematic cross-sectional view of the rotating plate. FIG.
FIG. 5 (a) is an enlarged view showing an example of a method of fixing a rotating sphere.
The rotary plate 7 is composed of three laminated plates, and the hole diameter of the middle plate b of the rotary plate 7 is larger than the outer diameter of the rotary ball 8 in the portion where the rotary ball 8 is disposed. The diameter of the hole in which the rotating ball 8 is disposed is smaller than the outer diameter of the rotating ball 8 so that the rotating ball 8 can freely rotate and does not fall out of the rotating plate 7.

FIG. 5 (b) shows an example in which the rotating ball 8 is fixed on a spit and rotated along the circumference of the rotating container. FIG. 6 is an example of a schematic plan view of a two-phase drive with a phase difference of 90 degrees showing the arrangement of the coil 3 for combined use of the rotational drive and induction heating of the magnetic generation mechanism 1.

Next, an embodiment in which driving has been confirmed will be described. The rotation and heating driving were confirmed using an AC energy converter in which the magnetic generating mechanism 1 and the container 2 having the rotation driving unit shown in FIG. Pour 1000 cc of water into the container 2 and use a two-phase inverter circuit (with one-phase switching) for a rotational drive frequency of 500 Hz and a drive power of 60 W
(For one phase) is applied to the coil 3 for the combined use of the rotational drive and induction heating, and the circuit connection of the coil 3 for the rotational drive and induction heating is made to be a four-pole two-phase configuration (FIG. 7A). The rotating ball rotated along the rotating guide groove, and the rotating plate was able to obtain a stable rotating state.

The control of the rotation starting force and the number of rotations can be further improved by using a servo circuit together. Heating is confirmed by electrically setting Sin / Cos to the same phase, generating an alternating magnetic field and using an induction heating method, and connecting each coil group so as to be two parallel, two series and two rows as shown in FIG. 7B. As a result of checking the heating state at a frequency of 2 kHz and an applied power of 500 W, 600 W, and 700 W, the water temperature was 70 ° C. after 10 minutes when 500 W was applied, and 80 ° C. after 10 minutes when 600 W was applied.
At the time of application of 00 W, the water temperature became 95 ° C. after 10 minutes and became a boiling state.

At this time, the temperature rise of the coil was 35 ° C. as measured by a resistance method, and it was confirmed that no problematic heat generation occurred. In addition, the coils of each coil group were wound as a bundle of a dozen or more thin wires to reduce the resistance. In the present embodiment, 17 coils of 0.35φ are bundled into one to form one coil, and each coil has a DC resistance of 100 m.
Ω or less (air core) to minimize heat generation due to copper loss.

Next, 30 0.35φ wires were bundled into one, and the DC resistance was further reduced. The rotating plate was applied with a frequency of 25 KHz or higher, which was higher than the audible frequency at which eddy current loss was more likely to be induced. , 900 W applied, and reached boiling in 6 minutes. Of course, it was also confirmed that the two-phase rotation drive was rotating stably (applied frequency: 500 Hz).

As described above, the rotation drive and the induction heating function can be used with the same coil, and the rotation coil and the induction coil can be used, respectively.
Compared with a conventional AC energy converter that can be heated and rotated by providing an induction heating coil, a smaller and less expensive AC energy converter has become possible. Further, rotation and heating can be alternately driven by switching switching according to the purpose of use.

Further, by taking one step further, time-division driving in which both are heated while being rotated as shown in FIG. 8 by a rotational driving time T1 and an induction heating driving time T2 can also be performed. In this case, the electric power induced by the rotating disk can be divided into a power component and a self-heating component as shown in the figure. This self-heating is also added to the induction heating amount. As a result, if only the rotation mode is used, the "rotation-heating mode" will actively operate the induction heating mode in a time-sharing manner to realize the "rotation-boiling mode" more efficiently. Co-Generation of terminal power equipment capable of
Contribute greatly to energy saving for the first century.

This embodiment is merely an example, and a coil may be formed by bundling wires having a smaller coil wire diameter or bundling several thick wires.

[0025]

As described above, according to the present invention, in order to reduce the housing area and cost, which have been problems in the prior art, the method for heating by the rotating magnetic field generating coil is focused on the magnetic generating coil and the driving conditions. Was found. That is, when rotating using the rotation driving coil, the applied frequency 1 is applied by the two-phase inverter circuit.
50 Hz to 600 Hz, rotationally driven by two phases of Sin and Cos, at the time of heating, one of Sin and Cos is switched to be in phase, and power is supplied and the applied frequency is made equal to or higher than the rotational drive frequency. The rotating plate made of a soft magnetic metal material can be heated by induction heating.

In order to further improve the heating efficiency, a coil is formed by bundling and twisting 10 or more wires having a small diameter into a single wire so as to have a low resistance equivalent to a wire having a large diameter. By doing so, heating and rotation can be electrically switched by the same coil, and as a result, the accommodation area is greatly improved, the size can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing an AC energy converter according to the present invention.

FIG. 2 is a diagram illustrating a container provided with a rotation drive unit of the AC energy converter.

FIG. 3 is a diagram illustrating a container from which a rotation drive unit of the AC energy converter is removed.

FIG. 4 is a diagram illustrating a rotating plate of the AC energy converter.

FIG. 5 is a diagram illustrating a method of fixing a rotating sphere of the AC energy converter.

FIG. 6 is a schematic plan view showing an example of an arrangement of a coil for combined use of rotational driving and induction heating of a rotating magnetic field generating mechanism of the AC energy converter.

FIG. 7 is a diagram illustrating an inverter circuit of the AC energy converter.

FIG. 8 is a diagram illustrating time-division driving of rotation and heating of the AC energy converter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic generation mechanism part 2 Container 3 Coil for combined use of rotation drive and induction heating 4 Magnetic core 5 Magnetic pedestal 6 Housing case 7 Rotating plate 8 Rotating ball

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[Procedure amendment]

[Submission date] November 27, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 5

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating current energy converter, which uses a rotary drive coil to generate a rotating magnetic field at the time of rotation, and switches and in-phase the coil to generate an alternating magnetic field at the time of heating. The present invention relates to an AC energy converter that can also serve as an induction heating function in addition to a rotation function capable of generating heat by induction heating of a rotating plate made of a metal material and a composite material thereof, and a rotatable warmer, a cooking pot, Applications such as scientific equipment are possible.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6 is a schematic plan view showing an example of an arrangement of a coil for combined use of rotation driving and induction heating of a magnetic generation mechanism of the AC energy converter.

Claims (7)

[Claims] In an AC energy converter in which a magnetic generating mechanism and a container having a rotation drive unit inside are separated and independent, the magnetic generating mechanism has a flat donut-shaped magnetic pedestal. A plurality of cored coils wound from a DC resistance winding are provided at regular intervals on the circumferential surface of the magnetic pedestal, and rotation and heating are performed by the same cored coil for rotational drive and induction heating. Characteristic AC energy converter. 2. A two-phase or three-phase inverter circuit, wherein two-phase drive with a phase difference of 90 degrees or three-phase drive with a phase difference of 120 degrees is used during rotational driving, and the phase is made the same during heating to form an alternating magnetic field generating method. The AC energy converter according to claim 1, wherein the switching is performed and the applied frequency is equal to or higher than the rotation frequency. 3. A plurality of wires are bundled into a single cored coil.
The AC energy converter according to claim 1 or 2, wherein the coil is formed to have a low DC resistance of 0.2Ω or less per coil. 4. The container provided with the rotary drive section is made of a non-magnetic heat-resistant material selected from glass, heat-resistant resin, stainless steel, and the like. The AC energy converter according to any one of claims 1 to 3, wherein the guide groove is provided. 5. The rotating mechanism provided in the container,
A rotating type plate made of hard magnetic material selected from iron, iron-based metal, composite material of perforated aluminum and iron, etc. At least three or more rotating balls freely rotating along the circumference are provided at equal intervals and arranged so as to be in contact with the guide grooves on the bottom surface inside the container, and the rotating balls are selected from glass, ceramic, and the like. The AC energy converter according to any one of claims 1 to 4, wherein the AC energy converter is made of a nonmagnetic or nonmetallic material. 6. The magnetic generating mechanism section, which is used for both rotary driving and induction heating, is provided with a magnetic core material of a cored coil and a material of a magnetic pedestal disposed at a lower portion, particularly for suppressing self-heating caused by the induction heating. Are Mn-Zn, N both having good high frequency characteristics
The AC energy converter according to any one of claims 1 to 5, wherein a ferrite material selected from i-Zn or the like is used. 7. The AC energy conversion device according to claim 1, further comprising switching means for switching between the rotary driving and the induction heating in a single mode, or time-division driving means for a dual mode. Machine.