JP2005216595A - Electromagnetic induction heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating device characteristically composed by using an electromagnetic induction heating coil having a strip-like and uniform heating characteristic. <P>SOLUTION: A winding structure 3 similar to that of a stator of a conventional linear motor or an A.C. rotary machine is applied; a polyphase alternating current of a commercial frequency or a high frequency exceeding it is carried to the respective windings 3 from a power conversion device 2 for outputting a plurality of alternating currents relatively different in phase; and an electric conductor 5 used as a heating object of the electromagnetic induction heating is disposed at a place where an original moving member is disposed to generate either a moving magnetic field or a rotating magnetic field. Thereby, the electric conductor 5 can be uniformly heated in a strip-like form. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an electromagnetic induction heating apparatus capable of uniformly heating an electric conductor to be heated with a band-like shape characteristic.

Conventional electromagnetic induction heating devices use a single-phase, spiral-shaped electromagnetic induction heating coil or an electromagnetic induction heating coil with a single-phase winding along the shape of a magnetic material such as ferrite. By using a power converter that outputs a single-phase alternating current, a single-phase alternating current is caused to flow through these electromagnetic induction heating coils, so that the magnetic flux caused by the alternating magnetic flux radiated from these electromagnetic induction heating coils is reduced. The surface of the heated electric conductor is heated using the principle of Joule heat generation by the eddy current of the heating electric conductor.
With respect to a conventional electromagnetic induction heating device, for example, in Patent Document 1, eddy current is generated on the surface of an electric conductor to be heated based on the principle of Arago's disk called physics, and Joule heat resulting from the eddy current is used. An electromagnetic induction heating method and apparatus for heating the heated electric conductor have been proposed. In order to perform the electromagnetic induction heating described in Patent Document 1, the object viewed from a stationary point on the magnetic field generation source is proposed. It is necessary to mechanically move the position of the heating electrical conductor at a predetermined speed.
As for the conventional electromagnetic induction heating device, for example, the electromagnetic induction heating device described in Patent Document 2 describes an example of an electromagnetic induction heating coil using a plurality of windings. Only one circuit of alternating current having the same phase and the same magnitude flows through the windings of the electromagnetic induction heating coil to which it belongs.

Japanese Patent Laid-Open No. 05-082248

Japanese Patent Application No. 2002-342115

When a planar heated conductor is heated using an electromagnetic induction heating coil having a conventional single-phase winding structure, the radiation directivity of alternating magnetic flux depends on the shape of the electromagnetic induction heating coil. The shape characteristic of heat generation of the heating electric conductor depends on the directivity of the magnetic flux. Therefore, a conventional electromagnetic induction heating coil is suitable for heating an electric conductor to be heated for a certain shape, but a conventional electromagnetic induction heating coil is heated in an application in which uniform heating is performed with a band-like shape characteristic on a flat surface. The problem is that the shape characteristics are not satisfied.

  A conventional electromagnetic induction heating coil that generates alternating magnetic flux by flowing a single-phase alternating current moves spatially in one direction when viewed from a stationary point on the electromagnetic induction heating coil. In the heated metal conductor, the Joule heat due to the eddy current loss is large at the position where the magnetic flux in the antinode portion is radiated, and the eddy current loss is caused in the position where the magnetic flux in the node portion is radiated in the heated metal conductor. Since the Joule heat is small compared to the case of the antinode, the heating distribution becomes non-uniform when viewed over the entire surface of the heated conductor.

  The concept of an alternating magnetic field radiated from an electromagnetic induction heating coil by flowing a single-phase alternating current in a conventional electromagnetic induction heating device can be described by the following mathematical formula.

In the above equation 1, the magnetic flux density is B, the maximum value of the magnetic flux density is B _m , the position of the stationary point with the coil is θ, the time is t, and the angular velocity is ω. When Equation 1 is expanded by the two-rotation magnetic field theory explained in Non-Patent Document 1, it can be described by the following mathematical formula.

Latest Electrical Engineering (Shota Miyairi, Maruzen)

If the first term on the right side of Equation 2 is B _f and the second term is B _b , then B _f and B _b are either a moving magnetic field or a rotating magnetic field having the same magnitude and different moving directions. 6. The electromagnetic induction heating device according to claim 1, wherein the concept of a moving magnetic field or a rotating magnetic field is expressed by B _f or B _{b of Formula} 2 when viewed from a certain stationary point on the electromagnetic induction heating coil. The electromagnetic induction heating coil is realized so that any one of the magnetic field distributions exists independently.

The first term B _{f and} the second term B _b on the right-hand side of the equation 2 are expressed by the following mathematical formulas for the expansion formula of the two-rotating magnetic field theory.

If B _mf ≠ B _mb and ω _f ≠ ω _b in the above equations 3 and 4, the mathematical formula described in equation 2 can be described as follows.

The magnetic field distribution expressed by Equation 5 is also a moving magnetic field or a rotating magnetic field. The electromagnetic induction heating coil according to any one of claims 1 to 3 to 5 includes realization of a magnetic field distribution expressed by Formula 5, and the power conversion device according to claim 2 includes the electromagnetic A plurality of alternating currents are output in order to realize the magnetic field distribution expressed by Equation 5 in the induction heating coil.
The invention according to claim 1 is similar to a combined structure of an existing AC rotating machine and a power converter that outputs a multiphase AC current for driving the AC rotating machine. Electromechanical conversion of energy is performed in which electrical energy output from the device is applied to the rotational torque of the rotor of the AC rotating machine. On the other hand, the electromagnetic induction heating coil according to claim 1 supplies eddy current to the surface of the metal conductor to be heated due to Lenz's law by supplying the electric energy output from the power converter to the electromagnetic induction heating coil. And the heated metal conductor is heated by actively using Joule heat generated by the eddy current, and the electromagnetic induction heating coil realizes electrothermal conversion of energy.
According to the second aspect of the present invention, an AC current having a frequency equal to a commercial power supply frequency or a high frequency exceeding the commercial power supply frequency is a sufficient number of the AC circuits to satisfy the number of the current circuits for a plurality of current circuits. A plurality of electric power converters that output current are used in the electromagnetic induction heating device according to claim 1, and a plurality of electromagnetic induction heating coils that are composed of a plurality of windings are relatively different in phase. It is possible to supply an alternating current of.
According to a third aspect of the present invention, the surface of the electric conductor to be heated is moved spatially in one direction in the single-phase alternating magnetic field radiated from the electromagnetic induction heating coil by the conventional single-phase alternating current. The heated eddy current circuit is moved uniformly in the same direction spatially to heat the heated electric conductor uniformly with a band-like shape characteristic.
According to a fourth aspect of the present invention, the electromagnetic induction heating coil according to any one of the first or third aspect is implemented using a stator structure of a conventional linear motor, and the heated electric conductor is electromagnetically heated by a moving magnetic field. The electromagnetic induction heating device according to claim 1 is realized by the electromagnetic induction heating coil.
According to a fifth aspect of the present invention, the electromagnetic induction heating coil according to any one of the first or third aspect is implemented using a stator structure of a conventional AC rotating machine, and the heated electric conductor is electromagnetically induced by a rotating magnetic field. The electromagnetic induction heating device according to claim 1 is realized by the electromagnetic induction heating coil to be heated.

  When the electromagnetic induction heating device according to claim 1 is manufactured, a number of electromagnetic induction heating coils having a plurality of electrically independent winding structures satisfying the necessary and sufficient number of multiphase alternating currents having relatively different phases. An electromagnetic induction heating device characterized by having a power conversion device that outputs a moving magnetic field or a rotating magnetic field by causing the multiphase alternating current to flow through each winding of the electromagnetic induction heating coil. The electromagnetic induction heating apparatus is characterized in that the electric conductor is electromagnetically heated with Joule heat resulting from the loss of the eddy current circuit according to the law.

  When the power conversion device according to claim 2 is manufactured, this is a power conversion device that outputs a multiphase alternating current having relatively different phases to a plurality of winding circuits, and the frequency of each phase of the multiphase alternating current is A power converter that outputs alternating current of high frequency exceeding commercial power supply frequency, and the power of each phase of the multiphase alternating current outputs alternating current of either equivalent frequency or different frequency It becomes an electromagnetic induction heater characterized by having an apparatus.

When the electromagnetic induction heating coil according to claim 3 is manufactured, it has a plurality of electrically independent windings, and a plurality of output systems in the power converter according to claim 2 are independent of each winding. The frequency of the alternating current flowing in each winding is a multiphase alternating current that is controlled so that the phase of the alternating current flowing in each winding is relatively different. A multi-phase alternating current of either a frequency equivalent to the frequency of the alternating current flowing through each winding with a phase alternating current or a frequency different from each other, and an alternating current flowing through each winding causes an induction magnetic field due to electromagnetic induction. When the magnetic field distribution generated in each winding part and including the vector element of each induction magnetic field is comprehensively determined for the electromagnetic induction heating coil, An electromagnetic induction heating device having an electromagnetic induction heating coil that moves the magnetic field strength distribution for generating eddy current in one direction spatially as viewed from a stationary point of the electromagnetic induction heating coil. .
When an electromagnetic induction heating coil having a winding structure similar to the stator winding structure of the conventional linear motor according to claim 4 is manufactured, it is constituted by a plurality of windings. By connecting the drive power source of the linear motor or the power conversion device according to claim 2 to the electromagnetic induction heating coil and flowing a multiphase alternating current having a relatively different phase through each winding circuit, the strength of the magnetic field is increased. The distribution moves in one direction spatially according to the direction in which the mover of the conventional linear motor moves. In the conventional linear motor, the energy supplied from the power conversion device contributes to the torque of the movable element according to Fleming's left-hand rule and mechanically moves the movable element in one direction. On the other hand, in the electromagnetic induction heating coil according to claim 3 or 4, the heated electric conductor is disposed at a position where the movable element originally exists, and the position of the heated electric conductor is used as a stator. The magnetic field strength distribution moves in the linear direction of the shape of the electromagnetic induction heating coil because it contributes to the generation of Joule heat caused by eddy currents on the surface of the heated electrical conductor according to Lenz's law by constraining Therefore, by moving the eddy current circuit according to Lenz's law in the same direction as the movement of the intensity distribution of the magnetic field, the Joule heat generation source due to the eddy current loss moves in the linear direction, and the shape of the electromagnetic induction heating coil The heated electric conductor can be heated with a band-like shape characteristic.
When an electromagnetic induction heating coil having a winding structure similar to the stator winding structure of the conventional AC rotating machine according to claim 5 is manufactured, it is constituted by a plurality of windings. A drive power supply of the AC rotating machine or the power conversion device according to claim 2 is connected to the electromagnetic induction heating coil, and a multiphase AC current having a relatively different phase is caused to flow through each winding circuit to thereby generate a magnetic field. The strength distribution of this moves spatially in one direction according to the direction in which the mover of the conventional AC rotating machine rotates. In the conventional AC rotating machine, the energy supplied from the power converter contributes to the rotational torque of the movable element according to Fleming's left-hand rule, and mechanically rotates the movable element. The electromagnetic induction heating coil according to any one of claims 5 to 7, wherein the heated electric conductor is disposed at a position where the movable element originally exists, and the position of the heated electric conductor is restrained with respect to the stator. It actively contributes to the generation of Joule heat caused by eddy currents on the surface of the heated electrical conductor according to the law. Therefore, since the magnetic field strength distribution moves in the direction of rotation of the shape of the electromagnetic induction heating coil, the eddy current circuit according to Lenz's law is also rotated in the same direction as the movement of the strength distribution of the magnetic field, so A Joule heat generation source rotates in the rotation direction, and the heated electric conductor can be heated with a band-like shape characteristic along the shape of the electromagnetic induction heating coil.

The apparatus configuration of the electromagnetic induction heating apparatus of the present invention is shown in FIG. In FIG. 1, reference numeral 2 denotes a power converter of the present invention, which outputs a commercial frequency or a high-frequency alternating current exceeding the commercial frequency, and supplies a number of the alternating currents that sufficiently and sufficiently satisfy the number of the alternating current circuit. It is characterized by outputting. In FIG. 1, reference numeral 3 denotes an electromagnetic induction heating coil according to the present invention, which moves the intensity distribution of a magnetic field for generating the eddy current in one direction spatially when viewed from a stationary point on the electromagnetic induction heating coil. It is characterized by that. In FIG. 1, reference numeral 1 denotes an input power source of the power converter. In FIG. 1, reference numeral 4 represents a magnetic flux line of either a moving magnetic field or a rotating magnetic field generated by passing an alternating current through the electromagnetic induction heating coil 3, and reference numeral 5 represents a heating object of the electromagnetic induction heating device. Heated electrical conductor. In FIG. 1, reference numeral 6 represents a current path of an eddy current generated on the surface of the heated electric conductor generated by Lenz's law.

  In the electromagnetic induction heating device of the present invention, an alternating magnetic field is generated by flowing an alternating current through a plurality of winding circuits and a power conversion device that outputs a plurality of alternating currents having relatively different phases with respect to the plurality of winding circuits. The concept of the electric circuit of the generated electromagnetic induction heating coil is shown in FIG. In FIG. 2, where N is the number of outputs of the power converter and the number of winding circuits, N is a natural number of 2 or more. In FIG. 2, the output AC voltage of the power converter represented by reference numerals 7, 8, 9, and 10 and the output AC current of the power converter represented by reference numerals 15, 16, 17, and 18 represent each phase information as a trigonometric function. The AC voltage waveform and the AC current waveform may be expressed by a square wave or a triangular wave that can express these fundamental waves as a trigonometric function by Fourier series expansion. Reference numerals 7, 8, 9, and 10 are voltages having relatively different phases, and reference numerals 15, 16, 17, and 18 are currents having relatively different phases. In FIG. 2, reference numerals 11, 12, 13, and 14 denote windings of the electromagnetic induction heating coil. In FIG. 2, reference numerals 19, 20, 21, and 22 represent magnetic flux lines of an alternating magnetic field generated when the alternating current flows through each winding.

FIG. 3 shows an embodiment of the electric circuit of the power conversion device and electromagnetic induction heating coil according to the present invention based on the concept of the electric circuit of FIG. Here, the number of the plurality of winding circuits 37, 38, 39 is three. The configuration of the power gate elements 30, 31, 32, 33, 34, and 35 of the power conversion device in FIG. 3 is referred to as a full bridge system in electrical engineering. In the power conversion device of the present invention, the configuration of the power gate element may be a half-bridge system called in electrical engineering. In FIG. 3, the winding connection structure of 36, 37, and 38 is referred to as a star connection in electrical engineering, but may be a delta connection referred to in electrical engineering. The basic concept of the electric circuit shown in FIG. 3 can be considered according to this even when the output of the power converter of the present invention exceeds three.
FIG. 4 shows an example of switching timing for the power gate elements 30, 31, 32, 33, 34, and 35 of the power conversion apparatus shown in FIG. The switching timing of FIG. 4 is referred to as 6-step three-phase switching in electrical engineering. The basic concept of switching of the power gate element shown in FIG. 4 can be considered according to this even when the output of the power conversion device of the present invention exceeds three.

  With respect to the electromagnetic induction heating coil of the present invention, by controlling the relative phase difference of alternating currents flowing through a plurality of winding circuits, the magnetic field strength distribution is spatially moved in one direction as seen from a stationary point of the coil. The system is called a moving magnetic field or a rotating magnetic field, and this is a principle that is generally known in the field of handling AC rotating machines. In particular, it is generally known that a linear motor is called a moving magnetic field, and an AC rotating machine is called a rotating magnetic field. For the electromagnetic induction heating coil of the present invention, the electromagnetic induction heating coil using the linear motor winding structure is used as the moving magnetic field type electromagnetic induction heating coil and the AC rotating machine winding structure according to this custom for convenience of explanation of the embodiment. The electromagnetic induction heating coils thus prepared are tentatively referred to as rotating magnetic field type electromagnetic induction heating coils.

  When implementing the moving magnetic field type electromagnetic induction heating coil of the present invention, first, a three-dimensional magnetic body similar to the tooth shape shown in FIG. 5 is prepared. The material of the magnetic material is preferably a ferrite with little magnetostriction loss and hysteresis loss. The electromagnetic induction heating coil of the present invention is realized by three-dimensionally implementing a plurality of windings in the magnetic body. As the winding method, full-pitch winding, short-pitch winding, etc. can be considered as in the case of the linear motor. FIG. 6 shows a winding with full-pitch winding, and FIG. 7 shows a winding with short-pitch winding. 6 and FIG. 7, both of which are constituted by three windings 36, 37, and 38, and the power converter of the present invention connected to this is used for the frequency of the commercial power source or A high-frequency alternating current exceeding that is output, and the alternating currents having different phases are output. In particular, when the three output AC currents are set under balanced three-phase conditions, the AC currents are of the same magnitude with different phases by three degrees in the three windings. 6 and 7 is equivalent to the power converter of the present invention configured by a half-bridge system and the windings of the electromagnetic induction heating coil of the present invention being star-connected.

  If the winding of the moving magnetic field shown in FIG. 6 and FIG. 7 is considered as a stator in a conventional linear motor, the mover according to the design specifications of the linear motor is arranged in accordance with the position of the stator of the linear motor. Thus, it is a well-known fact that the mover moves in one direction in accordance with Fleming's left-hand rule in the extension direction of the stator in accordance with the moving magnetic field. Also, when the mover is placed in an artificially constrained state so as not to move from the position of the stator, Joule heat is generated on the mover due to eddy currents generated by Lenz's law. This is also generally known from the past. However, in the present invention, the electromechanical conversion is not brought about by the action of the stator of the linear motor, which is originally designed to move mechanically, but the electric energy from the stator is applied to the heated electric conductor. It is characterized by acting to positively contribute to Joule heat generated on the surface. The heated electric conductor does not have to have the same structure as that of the conventional mover of the linear motor. The flat heated electric conductor is arranged along the extending direction of the electromagnetic induction heating coil. By passing the high-frequency currents having different phases relative to the plurality of windings of the electromagnetic induction heating coil at a commercial frequency or a high-frequency current exceeding the commercial frequency by the power conversion device, the heated electric conductor is heated. Realize.

  In the embodiment of the moving magnetic field type electromagnetic induction heating coil of the present invention, a short-pitch winding is applied to the ferrite of FIG. 5 in the manner shown in FIG. 7, and this is referred to as a two-pole moving magnetic field type electromagnetic induction heating coil 67. FIG. 8 shows a state in which a multiphase alternating current is supplied to the windings using the power converter 2 to heat the heated electrical conductor 5. The term “two poles” refers to the intensity of the magnetic field distribution radiated from the electromagnetic induction heating coil 67 at a certain time, where one N pole and one S pole are generated and collectively referred to as two poles. In FIG. 8, for example, the heated electric conductor 5 may be a strip-shaped stainless steel plate, and this shape may be planar. Further, the material of the heated electric conductor 5 is not limited to the stainless steel, and the eddy current caused by the alternating magnetic field is not affected by the winding magnetic field electromagnetic induction heating coil according to Lenz's law. Any material that flows in the conductor and generates Joule heat due to the eddy current may be used. In FIG. 8, even if the moving magnetic field type electromagnetic induction heating coil 67 and the heated electric conductor 5 are in contact with each other at a distance spatially indicated by reference numeral 68, the heated electric conductor 5 generates heat. The factor is clearly based on the principle of electromagnetic induction heating.

  FIG. 9 shows a horizontal direction of the magnetic flux radiation surface in which the strength distribution of the moving magnetic field type electromagnetic induction heating coil of the present invention moves spatially in one direction when viewed from a stationary point of the electromagnetic induction heating coil. Show. In FIG. 9, it is assumed that the electric power converter 2 of the present invention is connected to the electromagnetic induction heating coil 67, and this electrical condition is balanced three-phase. The balanced three-phase phases are referred to as the U-phase, V-phase, and W-phase, respectively. For these phases, the U-phase windings 70 and 73 have a U-phase AC current, and the V-phase windings 72 and 75 have a It is assumed that a W-phase AC current and a W-phase AC current flow through the W-phase windings 71 and 74. The U-phase windings 70 and 73 are different in winding direction and the V-phase windings 72 and 75 are different in winding direction around the direction perpendicular to the magnetic flux irradiation surface of the electromagnetic induction heating coil 67. W-phase windings 71 and 74 are windings in different circumferential directions, windings 70, 72, 74 are windings in the same circumferential direction, and windings 71, 73, 75 are windings in the same circumferential direction. Is a line. The strength distribution of the magnetic field at time t = 0 corresponding to the balanced three-phase phase is indicated by a solid line 78, and the strength distribution of the magnetic field at time t = 0 + Δt after the time Δt has elapsed therefrom is indicated by a broken line 79. In FIG. 9, the intensity distribution of the magnetic field viewed from a stationary point of the electromagnetic induction coil 67 moves in the linear direction 77 of the electromagnetic induction heating coil 67 as a geometric vector element with time. This is a feature of the electromagnetic induction heating coil of the present invention. The eddy current circuit 6 moves on the surface of the heated electric conductor 5 in accordance with the spatial movement direction of the magnetic field strength, and this also causes Joule heat caused by the eddy current generated on the surface of the heated electric conductor 5. The metal conductor 5 to be heated can move in the moving direction 77 and can be heated in a band shape along the shape of the electromagnetic induction heating.

  An embodiment of the rotating magnetic field type electromagnetic induction heating coil of the present invention is shown in FIG. In FIG. 10, the winding structure is the same as that of the stator of a conventional two-pole three-phase induction rotating machine, and the perpendicular to the magnetic flux irradiation surface of the moving magnetic field induction heating coil 67 in FIG. This is equivalent to the magnetic flux irradiation surface arranged so as to intersect the central axis 85 at a right angle. In FIG. 10, as an example, the structures of the windings 70, 71, 72, 73, 74, and 75 are single-pitch windings referred to in electrical engineering, but these structures are all-pitch windings referred to in electrical engineering. But it ’s okay. In FIG. 10, windings 70, 71, 72, 73, 74, and 75 are connected to the power conversion device of the present invention by applying either star connection or delta connection called electrical engineering. According to the present invention, the structure of the AC voltage sources 64, 65, 66 is a half bridge type called in electrical engineering, but this may be a full bridge called in electrical engineering. The electromagnetic induction heating coil of the present invention may use a stator structure of an AC rotating machine that uses a phase advance capacitor to spatially move the magnetic field strength distribution in one direction. The electric conductor to be heated of the rotary electromagnetic induction heating coil 84 may not have the structure of the mover of the conventional AC rotating machine, and in particular, it is used for heating the surface of the pipe made of the electric conductor to be wound in a loop shape. Suitable for

  FIG. 11 shows an application example of the moving magnetic field type electromagnetic induction heating coil of the present invention for the electromagnetic induction heating apparatus of the present invention. In FIG. 11, reference numeral 80 denotes an adherend, and reference numeral 81 denotes an adhesive that exhibits either thermoplastic or thermosetting adhesive properties applied to the adherend 80. In FIG. 11, when the adherend 80 and the heated electric conductor 5 are bonded with the adhesive 81, the moving electric field electromagnetic induction heating coil 67 to which the power converter of the present invention is connected is used. When the conductor 5 is heated, a thermal action is generated in the adhesive 81 to promote the bonding effect, and the bonding can be performed in a shorter time than before. Further, when the bonded structure shown in FIG. 11 is disassembled, the heated electric conductor 5 is heated by using the moving magnetic field type electromagnetic induction heating coil 67 to either melt or carbonize the adhesive 81. Since the deterioration effect can be obtained and the adherend 80 and the heated electric conductor 5 can be easily disassembled, the efficiency of the material separation and separation work at the time of disassembly of the bonded structure is improved. The heating range of the moving magnetic field type electromagnetic induction heating coil 67 has a belt-like shape characteristic along the area of the magnetic flux irradiation surface of the moving magnetic field type electromagnetic induction heating coil 67. It is determined that the dimension 82 in the belt length direction of the heating range is determined by the increase / decrease of the heating range, and the dimension 83 in the band width direction of the heating range is determined by the shape of the magnetic material that forms the framework of the moving magnetic field type electromagnetic induction heating coil 67. This is a feature of the magnetic field type electromagnetic induction heating coil 67.

  FIG. 12 shows an application example of a rotating magnetic field type electromagnetic induction heating coil in the electromagnetic induction heating apparatus of the present invention. The embodiment in FIG. 12 is an example when the electromagnetic induction heating device of the present invention is used as a fluid heating device such as water, alcohol or water vapor. In FIG. 12, reference numeral 90 represents a fluid storage tank, and may be referred to as a water source particularly when water is stored. In FIG. 12, reference numeral 87 denotes a fluid delivery pump, which has a fluid suction port 88 and a fluid delivery port 89. The fluid storage tank 90 and the fluid delivery pump 87 are connected by a suction port side connection pipe 91, and the heated conductor pipe 86 and the fluid delivery pump 89 are connected by a delivery port side connection pipe 92. Yes. In FIG. 12, when the power converter of the present invention is connected to the rotating magnetic field type electromagnetic induction heating coil 84 to heat the pipe 86 made of the heated electric conductor, a fluid is applied to the inner diameter portion of the pipe 86 made of the heated electric conductor. When the fluid flows, the fluid takes heat energy from the pipe 86 made of the heated electric conductor, so that the temperature of the fluid located at the heated fluid discharge port 93 becomes higher than the position of the outlet connection pipe 92. Compared with a conventional electromagnetic induction heating device using an alternating magnetic field, the rotating magnetic field type electromagnetic induction heating coil 84 of the present invention is bundled with a plurality of pipes 86 made of the heated electric conductor and inserted into the rotating magnetic field type electromagnetic induction heating coil 84. However, the heating effect of the fluid in each pipe 86 made of each heated electric conductor can be obtained uniformly.

An example of the apparatus structure of this invention is shown. The basic concept of an electric circuit is shown about the apparatus structure of this invention. An example of a power converter is shown about the device composition of the present invention. FIG. 4 shows an example of a switching timing diagram for the gate element shown in FIG. 3 for the power converter of the present invention. An example of the structure of a magnetic body that is a component of the electromagnetic induction heating coil according to the moving magnetic field type electromagnetic induction heating coil of the present invention will be shown. An example in which the whole body winding of the linear motor is implemented in a three-phase structure on the magnetic body shown in FIG. An example in which a short-ply winding of a linear motor is implemented in a three-phase structure on the magnetic body shown in FIG. An example of arrangement | positioning structure of the moving magnetic field type electromagnetic induction heating coil of this invention and a to-be-heated electrical conductor is shown. The concept of the strength distribution of the magnetic flux irradiated from the moving magnetic field type electromagnetic induction heating coil coil in this invention is shown. An example of the rotating magnetic field type electromagnetic induction heating coil and power converter of this invention is shown. An example regarding the implementation regarding the dismantling adhesion | attachment of the moving magnetic field type electromagnetic induction heating coil in this invention is shown. An example regarding the implementation regarding the heating apparatus of the fluid of the rotating magnetic field type electromagnetic induction heating coil in this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input power source of power converter 2 Power converter 3 Electromagnetic induction heating coil 4 Magnetic flux line 5 Heated electric conductor 6 Eddy current circuit 7 First AC voltage source 8 Second AC voltage source 9 Third AC Voltage source 10 Nth AC voltage source 11 First winding 12 Second winding 13 Third winding 14 Nth winding 15 AC current 16 flowing in the first winding 16 AC current 17 flowing in the second winding 17 AC current 18 flowing in the third winding 18 AC current flowing in the Nth winding 19 Magnetic flux 20 induced in the first winding 20 Second winding Magnetic flux 21 induced in the third winding 22 magnetic flux induced in the Nth winding 23 first rectifier diode 24 second rectifier diode 25 third rectifier diode 26 fourth Rectifier diode 27 smoothing reactor 28 flat Capacitor for slip 29 Power control device control circuit 30 Power gate element U
31 Power gate element X
32 Power gate element V
33 Power gate element Y
34 Power gate element W
35 Power gate element Z
36 U-phase winding 37 V-phase winding 38 W-phase winding 39 Power gate element state display axis 40 Power gate element U ON state 41 Power gate elements U, X OFF state 42 Power gate element X ON state 43 ON state of power gate element V 44 OFF state of power gate elements V and Y 45 ON state of power gate element Y 46 ON state of power gate element W 47 OFF state of power gate elements W and Z 48 Power gate element Z ON state 49 Time axis 50 of power gate elements U and X Time axis 51 of power gate elements V and Y Power gate element W and time axis 52 of Z Time 53 when power gate element X is OFF 53 Power gate element W is OFF Time 54 power gate element Y is OFF time 55 power gate element U is OFF time 56 power gate element Z is OFF time 57 power gate element V is OF F time 58 One cycle of output voltage waveform 59 Dead time 60 Tooth-shaped magnetic body 61 Plan view of tooth-shaped magnetic body 62 Front view of tooth-shaped magnetic body 63 Side view of tooth-shaped magnetic body 64 U-phase AC voltage source 65 V-phase AC voltage source 66 W-phase AC voltage source 67 Moving magnetic field type electromagnetic induction heating coil 68 Distance between coil and object to be heated 69 Magnetic flux irradiation surface 70 U-phase N-pole winding 71 W-phase S-pole Winding 72 V-phase N-pole winding 73 U-phase S-pole winding 74 W-phase N-pole winding 75 V-phase S-pole winding 76 A shaft 77 representing the magnetic field strength and polarity A shaft 78 representing the position coordinates on the coil Magnetic field strength distribution 79 at time t = 0 Magnetic field strength distribution 80 at time t = 0 + Δt Adhering material 81 Adhesive 82 Dimension in the length direction of the heating range 83 Dimension in the width direction of the heating range 84 Rotating magnetic field type electromagnetic induction heating coil 85 Center shaft 86 Pipe 87 made of heated conductor 87 Flow Feed pump 88 fluid inlet 89 fluid outlet 90 fluid reservoir tank 91 suction port side connecting pipe 92 the delivery port side connecting pipe 93 heated fluid outlet

Claims (5)

An electromagnetic induction heating device that generates eddy currents in an electrical conductor based on Lenz's law of electromagnetic induction and uses the generation of Joule heat by the eddy currents to A moving magnetic field or a rotating magnetic field is generated by flowing a plurality of alternating currents having relatively different phases through a power converter that outputs a plurality of alternating currents having different phases and a plurality of winding circuits. An electromagnetic induction heating device comprising an electromagnetic induction heating coil. 2. The electromagnetic induction heating apparatus according to claim 1, wherein an AC current having a frequency equal to a commercial power supply frequency or a high frequency exceeding the commercial power supply frequency is a sufficient number of current circuits for a plurality of current circuits. An electromagnetic induction heating device comprising: a power conversion device that outputs a multiphase alternating current having a frequency equal to or different from each other in frequency of each phase of the alternating current. 2. The electromagnetic induction heating device according to claim 1, wherein the intensity distribution of the magnetic field for generating the eddy current is controlled by controlling a relative phase difference between a plurality of alternating currents flowing through the plurality of winding circuits. An electromagnetic induction heating apparatus comprising an electromagnetic induction heating coil that moves spatially in one direction when viewed from a stationary point on the electromagnetic induction heating coil. The electromagnetic induction heating device according to any one of claims 1 to 3, wherein the electromagnetic induction heating coil according to claim 3 is implemented by a stator structure of a conventional linear motor, and an electric conductor to be heated is moved by a moving magnetic field. An electromagnetic induction heating device comprising an electromagnetic induction heating coil for electromagnetic induction heating. The electromagnetic induction heating device according to any one of claims 1 to 3, wherein the electromagnetic induction heating coil according to claim 3 is implemented with a stator structure of a conventional AC rotating machine, and an electric conductor to be heated by a rotating magnetic field. An electromagnetic induction heating device comprising an electromagnetic induction heating coil that electromagnetically heats the heat.

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