EP2181563B1 - Induktionsheizverfahren - Google Patents

Induktionsheizverfahren Download PDF

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Publication number
EP2181563B1
EP2181563B1 EP08784690A EP08784690A EP2181563B1 EP 2181563 B1 EP2181563 B1 EP 2181563B1 EP 08784690 A EP08784690 A EP 08784690A EP 08784690 A EP08784690 A EP 08784690A EP 2181563 B1 EP2181563 B1 EP 2181563B1
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EP
European Patent Office
Prior art keywords
winding
billets
iron core
billet
relative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08784690A
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German (de)
English (en)
French (fr)
Other versions
EP2181563A1 (de
Inventor
Carsten BÜHRER
Christoph FÜLBIER
Ingolf Hahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zenergy Power GmbH
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Zenergy Power GmbH
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Filing date
Publication date
Application filed by Zenergy Power GmbH filed Critical Zenergy Power GmbH
Publication of EP2181563A1 publication Critical patent/EP2181563A1/de
Application granted granted Critical
Publication of EP2181563B1 publication Critical patent/EP2181563B1/de
Not-in-force legal-status Critical Current
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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
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H05B6/145—Heated rollers

Definitions

  • the invention relates to a method for inductive heating of a billet of an electrically conductive material by relative movement, in particular generating a rotation between the billet and a magnetic field, which is generated by means of at least one DC-powered superconducting winding on an iron core.
  • a constant-speed cylindrical billet clamped in a rotary-driven jig can be rotated about its cylinder axis in a magnetic field generated by the superconducting winding by means of a constant current.
  • a largely constant current is induced in the billet.
  • the billet is usually not optimally cylindrical and / or not exactly clamped so that it is not rotated about its cylinder axis.
  • the magnetic flux through the billet also changes in terms of amount, so that a corresponding amount of non-constant induction current is induced in the billet.
  • rod-shaped billets e.g. With rectangular or oval cross-section, generated by rotation of the billets a constantly alternating induction current, which causes a correspondingly alternating return induction voltage and thus corresponding reverse induction losses.
  • the US 3,842,243 proposes to heat an electrically conductive billet in an alternating magnetic field.
  • an AC-powered conductor in a U-shaped yoke.
  • the section can be driven into magnetic saturation. Therefore, the magnetic flux of the alternating field is no longer complete Billet led, and this is locally heated less in the corresponding area.
  • the invention has for its object to reduce the back induction losses in the superconducting winding when carrying out the method mentioned in the introduction.
  • At least one billet is moved relative to a magnetic field. It does not matter whether the magnetic field is rotated around the billet or vice versa.
  • a direct current is generated and maintained in the superconducting winding with a magnetic flux density in the iron core at least in the region of the winding at which the relative permeability of the material of the iron core is smaller than in the de-energized state the winding is.
  • the relative permeability decreases, the back induction and thus the loss in the superconducting winding decreases.
  • the magnetic field of the winding leading effect of the iron core is maintained. As a result, the re-induction is reduced.
  • the position of the billets relative to one another can be regulated so that subtractively superposing the back induction voltages generated by the alternating induction currents of the billets.
  • the magnetic flux through the billet is approximately proportional to the projection surface of the billet on a plane perpendicular to the field lines.
  • the position of the billets is controlled to each other so that the two billets are mutually rotated by 45 ° about their parallel longitudinal axes, for then the magnetic flux through one of the two billets increases to the same extent as it decreases by the other billet. If the river has reached its maximum through one billet, it subsequently decreases again, with the flow through the other ticket increasing to the same extent.
  • the summed magnetic flux through the billets is ideally constant.
  • the relative movement of the billets relative to each other can be controlled so that the reinduction stresses generated by the time varying induction currents of the billets subtract super subtractively (Claim 2).
  • this solution is also concerned with rotating the billets in a magnetic field in such a way that their summed projection area is at least largely constant.
  • the time-related change in the magnetic flux through the billets, summed up due to changing rotational speeds of the individual billets relative to the magnetic field can be minimized.
  • two preferably identical, for example, cylindrical billets rotated about their respective longitudinal axis can be turned in opposite directions and preferably with the same angular velocity in terms of absolute value (claim 3).
  • the process can also be carried out with the simultaneous heating of different billets. If the cross sections of the billets have symmetries, these can be exploited in a targeted manner.
  • a first of the cylindrical billets of the above example with a square-shaped bar and replace the second cylindrical billet with a regular octahedral cross-section billet.
  • the first billet is rotated at double the angular velocity as the second and opposite to this.
  • the billets are preferably aligned against each other prior to the start of the rotation so that the magnetic flux either increases initially or decreases initially with the start of the rotational movement through both billets.
  • the projection surfaces of the two billets on a plane perpendicular to the magnetic flux are both maximum or both minimum. If the two billets are rotated in the same direction (with unchanged ratio of the angular velocities to each other), the billets are aligned before starting so that with the start of Drehbwegung the magnetic flux decreases by one of the billets initially and increases by the other initially.
  • the projection area of a billet is preferably maximum and the projection area of the other billet is minimal.
  • the magnetic changes Flow through the two billets in opposite directions, so that the individual billets assigned return induction voltages have different signs and subtractive superpon Schl.
  • a band-shaped high-temperature superconductor can be used.
  • HTSC band-shaped high-temperature superconductor
  • cuprate superconductors are referred to, ie rare earth copper oxides, such as YBa 2 Cu 3 O 7-x .
  • the value of the direct current can be kept at least substantially constant by a regulated current source connected to the winding. Due to the low re-induction, this constant current source can have a smaller control range and thus be less expensive than when carrying out the method according to the prior art.
  • the device in particular for carrying out any of the above-described methods, has a superconducting winding on an iron core, a DC source for generating a DC current in the winding, at least one chuck for a billet of an electrically conductive material and a rotary drive for generating a relative movement between the coil and the clamping device.
  • the value of the DC current generated in the winding by the DC power source is set so that the relative permeability of the iron core is reduced at least in the region of the winding relative to the currentless state of the winding (claim 8).
  • the clamping devices can optionally or alternatively be driven in opposite directions and preferably with approximately the same angular velocity in terms of absolute value (claim 9).
  • the clamping devices may have correspondingly controlled drive motors.
  • at least two jigs can be driven by a common motor.
  • a gearbox with drives running in opposite directions and with the same angular velocity in absolute terms transmits the engine power to the clamping devices.
  • the apparatus may have means for determining the respective re-induction voltages produced by the time-varying induction currents in the billets.
  • the rotary drives of the jigs are controlled so that subtractively superposing the respectively induced by the billets remindindutationshoven (claim 10).
  • the position of the billets to each other and / or the relative movement of the billets to each other can be controlled by the controller.
  • the iron core used can be a rod in the simplest case. At both ends of the rod, a billet can be moved, in particular rotated, relative to the magnetic field emerging from the rod. The magnetic inference takes place through the free space.
  • An at least approximately C-shaped yoke has an air gap between two Pole shoes of the otherwise annular cross-sectionally closed yoke in which the billet can be rotated.
  • Such an iron core allows good guidance of the magnetic flux through a billet to be heated. Compared to the rod, the magnetic inference is also due to the iron core.
  • the iron core is an approximately E-shaped yoke, each with an air gap between the center leg and the respective end leg for receiving a billet.
  • the winding is preferably arranged on the middle leg.
  • Such an iron core makes it possible to heat two billets simultaneously with only one winding and also to guide the magnetic return flow through the iron core. For this purpose, in each of the air gaps per a billet is moved relative to the magnetic field, preferably rotated in the air gap.
  • the iron core consists at least partially of layered sheets. This reduces possible eddy currents in the iron core. Correspondingly, the eddy current dissipation power that heats the iron core decreases and the measures for cooling the iron core can be smaller. At the same time, the possible heat input from the iron core to the superconducting winding is reduced.
  • the sheets are at least partially layered approximately orthogonal to the plane in which the current induced in the billet flows for the most part. This allows a good guidance of the magnetic field with low eddy current losses.
  • the cross section in the region of the winding is preferably chosen to be smaller than outside the winding. This further reduces the reinduction.
  • the induction heater in Fig. 1 serves to heat a billet 10 by rotating the billet 10 in a magnetic field generated by a magnetic system 50.
  • the billet 10 is clamped between a right and a left pressure element 2a and 2b of a clamping device and by a motor 1 rotatably driven.
  • a gear 3 connects the motor shaft with the shaft of the movable in the direction of the two-sided arrows jig 2a.
  • the magnet system 50 may, as in Fig. 2a and 2b shown greatly simplified, a DC powered superconducting winding 60 on a rod-shaped iron core 55.2 include. Between the winding 60 and the iron core 55.2 is an insulation element 61, for example a vacuumized cavity, which reduces the heat input into the winding 60 (only Fig. 2b ).
  • the rod-shaped iron core 55.2 carries the magnetic field (not shown) generated by the DC-powered winding 60, which exits the two end faces 56.2, 57.2 of the iron core 55.2 as if from a lens and enters the billets 10 located there via an air gap.
  • the magnetic flux changes relative to the billet 10 and an induction current is induced in the billet 10.
  • the induction current in the billets 10 in turn generates a further magnetic field which superimposes with the magnetic field generated by the winding and induces a voltage in the winding 60 back.
  • ⁇ wi ( t ) 0.
  • the back induction can be reduced by feeding the winding 60 with a direct current which preferably lowers the relative permeability to shortly before the saturation region.
  • the magnet system 50 may consist essentially of a C-shaped iron core 55.3 with a preferably HTSC winding 60 (FIG. Fig. 3a and 3b ).
  • the winding 60 is fed by a regulated DC power source 80.
  • the iron core carries the magnetic field thus generated, which is symbolized by the black arrows (only Fig. 3b ).
  • the magnetic inference is not due to the free space but through the leg 57.3 ( Fig. 3b ).
  • At least one billet 10 to be heated is located between the two legs 56.3, 57.3 of the iron core 55.
  • the billet 10 to be heated is generally not exactly cylindrical and is usually not rotated exactly around its cylinder axis. Accordingly, the surface of the billet 10 penetrated by the magnetic flux and thus the back induction varies, as a result of which the current through the superconducting winding also varies.
  • the back induction is reduced by appropriate selection of the value of the DC current with which the winding 60 is fed.
  • the sectional area of the iron core 55.3 at right angles to the magnetic field symbolized by the black arrows is reduced in the area of the winding 60 in comparison to the corresponding areas of the legs 56.3, 57.3.
  • the reduced thickness d wi of the iron core in the area of the winding compared to the thickness d f of the free legs.
  • the iron core 55.4 as in Fig. 4a and Fig. 4b shown, also be E-shaped. Between the free legs 71 and 72 or 72 and 73 is ever a bag into which a billet 10 is introduced.
  • the iron core 55.4 is comprised of laminated sheets 58 stacked orthogonal to the plane in which the current induced in the billets 10 flows.
  • Fig. 5 shows the calculated reinduction voltage U ind in volts as a function of the winding current I wi from 120 kW heating power by rotation of a billet in the field of a winding on an iron core having 3000 turns, with a uniform change in the rotational frequency of the billet relative to the winding within 1s 8 Hz.
  • the return induction voltage has its maximum value of about 220 V.
  • I wi With increasing current I wi , the reverse induction initially decreases greatly in magnitude.
  • An increase in the current I wi for example, about 15 A to I wi ⁇ 65 A lowers the back-induction voltage U ind magnitude to approximately 100 V.
  • the induction heater is between about 60 A (-180,000 ampere turns) and about 80 A ( ⁇ 240,000 ampere turns), especially at about 70 A ( ⁇ 210,000 ampere turns), because then the relative permeability of the iron core has a value only allows a relatively low re-induction, but at the same time still sufficient so that the iron core leads the magnetic field generated by the superconducting winding to the billet.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
EP08784690A 2007-07-26 2008-07-10 Induktionsheizverfahren Not-in-force EP2181563B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007034970A DE102007034970B4 (de) 2007-07-26 2007-07-26 Verfahren und Vorrichtung zum induktiven Erwärmen zumindest eines Billets
PCT/EP2008/005647 WO2009012896A1 (de) 2007-07-26 2008-07-10 Induktionsheizverfahren

Publications (2)

Publication Number Publication Date
EP2181563A1 EP2181563A1 (de) 2010-05-05
EP2181563B1 true EP2181563B1 (de) 2010-08-25

Family

ID=39876587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08784690A Not-in-force EP2181563B1 (de) 2007-07-26 2008-07-10 Induktionsheizverfahren

Country Status (14)

Country Link
US (1) US20090255923A1 (ru)
EP (1) EP2181563B1 (ru)
JP (1) JP5025797B2 (ru)
KR (1) KR20100039355A (ru)
CN (1) CN101803453A (ru)
AT (1) ATE479314T1 (ru)
AU (1) AU2008280489A1 (ru)
BR (1) BRPI0814393A2 (ru)
CA (1) CA2688075C (ru)
DE (2) DE102007034970B4 (ru)
ES (1) ES2351182T3 (ru)
RU (1) RU2462001C2 (ru)
TW (1) TW200922382A (ru)
WO (1) WO2009012896A1 (ru)

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DE102010024883A1 (de) 2010-06-24 2011-12-29 Zenergy Power Gmbh Vorrichtung zum Einschmelzen von Metallstücken
DE102010053284A1 (de) * 2010-12-02 2012-06-06 Zenergy Power Gmbh Verfahren und Induktionsheizer zum Erwärmen eines Billets
EP2753202B1 (en) 2011-09-06 2016-04-27 British American Tobacco (Investments) Ltd Heating smokeable material
DE102011053535B4 (de) 2011-09-12 2024-08-14 Bl Chemie Gmbh & Co. Kg Vorrichtung zur induktiven Erwärmung von Metallkörpern oder Metall enthaltenden Körpern
CN104285501B (zh) * 2012-03-01 2016-07-20 伊诺瓦实验室公司 用于坯锭的感应加热的装置
GB201217067D0 (en) 2012-09-25 2012-11-07 British American Tobacco Co Heating smokable material
CN103916055B (zh) * 2014-02-18 2016-03-30 上海超导科技股份有限公司 基于减速箱的超导直流感应加热电机启动装置及其方法
CN103916054B (zh) * 2014-02-18 2016-06-15 上海超导科技股份有限公司 基于褪磁的超导直流感应加热电机启动装置及其方法
KR101658727B1 (ko) * 2015-03-11 2016-09-21 창원대학교 산학협력단 이동형 철심을 이용한 초전도 자석 장치 및 그의 유도가열장치
US20170055575A1 (en) 2015-08-31 2017-03-02 British American Tobacco (Investments) Limited Material for use with apparatus for heating smokable material
US20170055584A1 (en) 2015-08-31 2017-03-02 British American Tobacco (Investments) Limited Article for use with apparatus for heating smokable material
US11924930B2 (en) * 2015-08-31 2024-03-05 Nicoventures Trading Limited Article for use with apparatus for heating smokable material
US20170119046A1 (en) 2015-10-30 2017-05-04 British American Tobacco (Investments) Limited Apparatus for Heating Smokable Material
US20170119047A1 (en) 2015-10-30 2017-05-04 British American Tobacco (Investments) Limited Article for Use with Apparatus for Heating Smokable Material
KR101877118B1 (ko) * 2016-06-14 2018-07-10 창원대학교 산학협력단 자기장 변위를 이용한 초전도 직류 유도가열 장치
BR112019009137A2 (pt) 2016-11-10 2019-07-16 British American Tobacco Investments Ltd composição, dispositivo, cartucho e método para gerar um meio inalável
KR101922688B1 (ko) * 2017-02-20 2018-11-27 수퍼코일 (주) 초전도 자석 회전형 직류 유도 가열 장치
IT201700031443A1 (it) * 2017-03-22 2018-09-22 Univ Bologna Alma Mater Studiorum Apparato e metodo di riscaldamento ad induzione
CN107846740B (zh) * 2017-11-10 2021-02-23 中国航发贵州黎阳航空动力有限公司 用于燃油总管热态密封试验的加热装置
KR102040696B1 (ko) * 2019-03-26 2019-11-05 이명옥 인덕션 가열 조리장치
KR102084111B1 (ko) * 2019-03-26 2020-03-03 이명옥 인덕션가열용 회전식 조리장치 및 이를 포함하는 인덕션 가열시스템
KR102676202B1 (ko) * 2019-09-06 2024-06-19 주식회사 엘지에너지솔루션 배터리의 내부 단락 유도 장치 및 이를 이용한 단락 유도 방법
KR102408264B1 (ko) * 2019-10-01 2022-06-13 주식회사 피에스텍 적층형 코어 및 이를 이용한 유도 가열 장치
CN111010756B (zh) * 2019-11-26 2021-04-16 江西联创光电超导应用有限公司 一种加热导体胚料的方法和设备
CN111225465B (zh) * 2020-02-17 2022-02-01 中国科学院电工研究所 一种混合磁路超导感应加热装置
KR102235546B1 (ko) * 2020-09-02 2021-04-05 고등기술연구원연구조합 영구자석을 이용한 빌렛 가열 장치 및 회전 속도 제어 방법
CN112423416A (zh) * 2020-11-23 2021-02-26 江西联创光电超导应用有限公司 一种新型高温超导感应加热装置
CN112588974B (zh) * 2020-11-23 2022-10-18 江西联创光电超导应用有限公司 一种铝合金加热设备及操作方法
CN112165743B (zh) * 2020-11-30 2021-03-16 江西联创光电超导应用有限公司 一种无磁低旋涡定位装置
CN112203371B (zh) * 2020-12-02 2021-04-02 江西联创光电超导应用有限公司 一种超导感应加热装置的磁屏蔽装置
CN113727482A (zh) * 2021-08-31 2021-11-30 南京邮电大学 一种超导直线感应加热装置

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Publication number Publication date
CN101803453A (zh) 2010-08-11
DE102007034970A1 (de) 2009-02-05
CA2688075C (en) 2010-10-05
TW200922382A (en) 2009-05-16
DE102007034970B4 (de) 2010-05-12
RU2010106391A (ru) 2011-09-10
JP5025797B2 (ja) 2012-09-12
JP2010534905A (ja) 2010-11-11
KR20100039355A (ko) 2010-04-15
WO2009012896A1 (de) 2009-01-29
BRPI0814393A2 (pt) 2018-01-09
RU2462001C2 (ru) 2012-09-20
US20090255923A1 (en) 2009-10-15
DE502008001221D1 (de) 2010-10-07
EP2181563A1 (de) 2010-05-05
AU2008280489A1 (en) 2009-01-29
CA2688075A1 (en) 2009-01-29
ATE479314T1 (de) 2010-09-15
ES2351182T3 (es) 2011-02-01

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