EP3145275A1 - Bobine de chauffage a induction - Google Patents

Bobine de chauffage a induction Download PDF

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Publication number
EP3145275A1
EP3145275A1 EP15185774.5A EP15185774A EP3145275A1 EP 3145275 A1 EP3145275 A1 EP 3145275A1 EP 15185774 A EP15185774 A EP 15185774A EP 3145275 A1 EP3145275 A1 EP 3145275A1
Authority
EP
European Patent Office
Prior art keywords
coil
induction heating
heating coil
winding
coil according
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.)
Granted
Application number
EP15185774.5A
Other languages
German (de)
English (en)
Other versions
EP3145275B1 (fr
Inventor
Chris VOLKMAR
Ubbo Ricklefs
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.)
Technische Hochschule Mittelhessen
Original Assignee
Technische Hochschule Mittelhessen
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Publication date
Application filed by Technische Hochschule Mittelhessen filed Critical Technische Hochschule Mittelhessen
Priority to EP15185774.5A priority Critical patent/EP3145275B1/fr
Publication of EP3145275A1 publication Critical patent/EP3145275A1/fr
Application granted granted Critical
Publication of EP3145275B1 publication Critical patent/EP3145275B1/fr
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Classifications

    • 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
    • H05B6/36—Coil arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J27/00—Ion beam tubes
    • H01J27/02—Ion sources; Ion guns
    • H01J27/16—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation
    • H01J27/18—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation with an applied axial magnetic field
    • 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
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03H1/00—Using plasma to produce a reactive propulsive thrust
    • F03H1/0081—Electromagnetic plasma thrusters

Definitions

  • the present invention relates to an improved induction heating coil which is particularly suitable for heating low temperature plasmas.
  • Electromagnetic coils are in electrical engineering windings and winding goods, which are adapted to generate or detect a magnetic field. They are often part of an electrical component or device, such as a transformer, relay, electric motor or speaker. An important application of coils is the field of inductive heating of electrically conductive materials.
  • Coils usually comprise at least one winding of a conductor. This consists for example of wire, enameled copper wire, silver-plated copper wire or high-frequency stranded wire. Coils are often often wound on a bobbin (coil carrier).
  • the bobbin can be either solid or hollow. Hollow bobbins may comprise a core of another material (e.g., a soft magnetic material).
  • the winding arrangement and shape, the wire diameter, the winding and the core material determine the value of the inductance and other (quality) properties of the coil.
  • the operating principle of coils is based on the fact that when they are traversed by the electrical alternating current, a magnetic field B builds up in their interior. This causes an electric field E, which is an acceleration causes the charge carrier inside the coil.
  • This field essentially comprises the two components E ⁇ and E z when the coil is a cylindrical coil.
  • the first component E ⁇ causes the charge carriers are accelerated on a circular path perpendicular to the main coil axis.
  • the main coil axis is also referred to as the z-axis.
  • the plane of this perpendicular to the main coil axis is also referred to as in the azimuthal plane.
  • the second component E z causes an acceleration of the charge carriers along the main coil axis.
  • the electrical properties of coils are greatly determined by the way the electrical conductor from which they are wound is wound up. Important here is the resulting geometric structure of one or more turns or layers. This structure is also called winding.
  • the field lines of the magnetic field of the coil are substantially parallel. It follows that the electric field resulting from the magnetic field essentially comprises only one component E ⁇ . The component E z and thus the acceleration along the main axis of the coil can thereby be neglected. It follows that the charge carriers are accelerated on a fixed circular path and do not move in a helical movement towards the coil end.
  • Coils that serve as induction heating coils usually comprise only a few windings and are to be regarded as short. This means that charge carriers inside the coil usually experience a non-negligible acceleration in the z direction. If the material to be heated inside the coil consists of condensed matter, i. it is present as a solid or liquid, the acceleration along the z-axis is irrelevant, since the charge carriers of these materials can not leave the coil.
  • the charge carriers can leave the induction heating coil and thus be lost to the heating process. This reduces the efficiency of the heating process. So far, the influence of the escape along the coil main axis and thus not contributing to the heating charge carriers is achieved by increasing the injected electromagnetic energy. However, this solution is energy-consuming and lowers the efficiency of the induction heating coil.
  • the object of the invention is to provide an induction heating coil for inductive heating, which has a reduced acceleration of the charge carriers in it along the z-axis.
  • the induction heating coil according to the invention has a first inner winding W 1 and at least one further outer winding W 2 .
  • the inner winding W 1 has a radius r 1 and the outer winding W 2 has a radius r 2 ( Fig. 3 ).
  • r 1 is smaller than r 2 .
  • inner winding W 1 lies within the outer winding W 2 .
  • the windings W 1 and W 2 are connected at a point 100 at one end of the coil, so that at this point 100 a current flow i through the coil changes its axial direction in the z-direction.
  • the radii r 1 and r 2 of the windings W 1 and W 2 are preferably 10 mm to 100 mm.
  • the length of the induction heating coil is preferably between 10 mm and 100 mm.
  • the number of turns N of the windings W 1 and W 2 of the induction heating coil is preferably 3 to 20, more preferably 5 to 10. Coils with smaller numbers of turns have a larger z-component of the resulting electric field. With larger numbers of turns, the efficiency of the induction heating coil decreases due to the greater electrical resistance.
  • this has a rectangular, round or ellipsoidal shape. This allows an adaptation of the coil to the bobbin. Furthermore, such a regular shape of the coil leads to a more homogeneous field inside the coil.
  • a use of the induction heating coil according to the invention is in inductively or inductively capacitively excited ion or electron sources. Here it serves the coupling of electromagnetic energy.
  • These sources contain a gas (e.g., xenon) and high frequency electrons within an isolated vessel, the discharge vessel.
  • a gas e.g., xenon
  • an induction heating coil for feeding a necessary for plasma excitation high-frequency energy is wound.
  • the current flow in the coil results in a magnetic field, which accelerates electrons inside the coil.
  • the inductively-coupled plasma is heated more efficiently because relatively more field energy is induced in the azimuthal plane and is not lost by the acceleration along the z-axis. This causes the through The electric fields accelerated electrons are forced on spiral tracks whose axial slope is getting smaller. The latter causes a greater proportion of the accelerated electrons to remain within the coil and assist in the heating of the plasma.
  • a radio frequency ion motor comprises the induction heating coil according to the invention.
  • a radio-frequency ion engine a high-frequency plasma to be stimulated within an insulated vessel, the so-called discharge vessel.
  • a coupling coil induction heating coil for feeding a necessary energy for plasma excitation.
  • the plasma is thus inside the coil.
  • the Indutationswespule invention causes the axially induced fields in the z-direction due to the symmetry almost cancel, since the same current flows in both the positive and in the negative z-direction. That is, the component E z of the resulting electric field is attenuated. Since the current flows through both windings of the induction heating coil in parallel, the resulting field components E ⁇ overlap at the same time and are thus amplified. In addition, due to the increasing coil inductance L, a lower current I current is needed to provide the magnetic field. This favors the thermal behavior of the coil, since smaller currents lead to less ohmic power dissipation.
  • the radius of the outer winding W 2 is greater than the radius of the inner winding W 1 , thus the field induced by W 2 is somewhat smaller in magnitude than that induced by W 1 . Nevertheless, the component E z of the resulting electric field is negligibly small.
  • An exemplary embodiment is an ion engine comprising the coil according to the invention as induction heating coil.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • General Induction Heating (AREA)
  • Plasma Technology (AREA)
EP15185774.5A 2015-09-18 2015-09-18 Bobine de chauffage a induction Active EP3145275B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15185774.5A EP3145275B1 (fr) 2015-09-18 2015-09-18 Bobine de chauffage a induction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15185774.5A EP3145275B1 (fr) 2015-09-18 2015-09-18 Bobine de chauffage a induction

Publications (2)

Publication Number Publication Date
EP3145275A1 true EP3145275A1 (fr) 2017-03-22
EP3145275B1 EP3145275B1 (fr) 2022-04-20

Family

ID=54196795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15185774.5A Active EP3145275B1 (fr) 2015-09-18 2015-09-18 Bobine de chauffage a induction

Country Status (1)

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EP (1) EP3145275B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053929A1 (de) * 1970-11-03 1972-06-22 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Ionentriebwerk
EP0261338A2 (fr) * 1986-09-24 1988-03-30 Leybold Aktiengesellschaft Source d'ions fonctionnant par induction
EP1662848A2 (fr) * 2004-11-29 2006-05-31 Samsung Electronics Co., Ltd. Accélérateur à induction électromagnétique basé sur une modulation par bobines
WO2015025022A1 (fr) * 2013-08-22 2015-02-26 Continental Automotive Gmbh Dispositif et procédé de fabrication d'un enroulement chauffant sur un corps de base métallique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053929A1 (de) * 1970-11-03 1972-06-22 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Ionentriebwerk
EP0261338A2 (fr) * 1986-09-24 1988-03-30 Leybold Aktiengesellschaft Source d'ions fonctionnant par induction
EP1662848A2 (fr) * 2004-11-29 2006-05-31 Samsung Electronics Co., Ltd. Accélérateur à induction électromagnétique basé sur une modulation par bobines
WO2015025022A1 (fr) * 2013-08-22 2015-02-26 Continental Automotive Gmbh Dispositif et procédé de fabrication d'un enroulement chauffant sur un corps de base métallique

Also Published As

Publication number Publication date
EP3145275B1 (fr) 2022-04-20

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