EP1513168A2 - Méthode et dispositif de magnétisation d'un système magnétique - Google Patents

Méthode et dispositif de magnétisation d'un système magnétique Download PDF

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Publication number
EP1513168A2
EP1513168A2 EP04405528A EP04405528A EP1513168A2 EP 1513168 A2 EP1513168 A2 EP 1513168A2 EP 04405528 A EP04405528 A EP 04405528A EP 04405528 A EP04405528 A EP 04405528A EP 1513168 A2 EP1513168 A2 EP 1513168A2
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EP
European Patent Office
Prior art keywords
magnetizing
pulse
current
coil
magnetizing coil
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
EP04405528A
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German (de)
English (en)
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EP1513168B1 (fr
EP1513168A3 (fr
Inventor
Albert Maurer
Urs Meyer
Stefan Haas
Olivier Müller
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Publication of EP1513168A3 publication Critical patent/EP1513168A3/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F17/0013—Printed inductances with stacked layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator

Definitions

  • the present invention relates to a method and a Device for magnetizing a magnet system according to Preambles of the independent claims.
  • the invention is suitable for.
  • magnetizing permanent magnets Magnetizing coil It is known for magnetizing permanent magnets Magnetizing coil to use.
  • the magnetizing coil is immediately above the magnetic body to be magnetized or arranged around him.
  • the magnetizing coil is a associated with charged capacitor, which via the coil unloaded. That in the magnetizing coil at short notice built-up magnetic field magnetizes the magnetic body.
  • the usual pulse durations be 10 ms or more. It is observed that the magnetizing coil undesirably strongly heated, which a high clock frequency makes it impossible and the use of complex cooling systems conditional.
  • NdFeB neodymium-iron-boron
  • DE-39'34'691 a device is described, in which the magnets in a current-carrying conductor be pushed. A magnetizing of pre-assembled Magnets can not be reached with this device.
  • the in DE-39'34'691 mentioned parallelization refers on adjacent conductors for magnetizing long bar magnet or multi-pole Magnetization.
  • the method and the device should be particularly also allow permanent magnets made of rare earth materials in Series production with a high clock rate of one second or less magnetizing and so high productivity too guarantee.
  • the method and the device are intended for the use in an automated production plant be suitable, while also magnetizing already to allow magnets wound on rotors. she should work energy-saving and get along with air cooling.
  • the device should be compact, robust and be cost-effective and if possible standard components use.
  • the material to be magnetized with a current flowing through a Magnetisierspule current pulse or the magnetic field built up by the magnetizing coil magnetized and magnetically anchored The magnetization by the magnetic field is the heating of the magnetizing coil opposite. Therefore, the current pulse has to be short enough to avoid any to cause too much warming.
  • a Current pulse with a pulse duration between 10 ⁇ s and 500 ⁇ s and preferably used between 10 ⁇ s and 200 ⁇ s.
  • Of the Power pulse must be strong enough at the same time, however, for a the magnetization to build up sufficient magnetic field.
  • the one required short pulse with strong magnetic field becomes preferably by superposition of several Magnetizing coils with low number of turns achieved.
  • the inventive method for Magnetizing a magnet system to the magnet system Magnetizing assigned is with subjected to a current pulse with a limited pulse duration, whereby a magnetic field interacting with the magnet system is built.
  • the pulse duration of the current pulse on a value between 10 ⁇ s and 500 ⁇ s and preferably limited between 10 ⁇ s and 200 ⁇ s.
  • the inventive device for magnetizing a Magnet system includes a pulse generator circuit with a capacitor element, one with the capacitor element electrically connected magnetizing coil and a Switching element, by its actuation the magnetizing coil with a by discharge of the capacitor element resulting current pulse with limited pulse duration acted upon and thus the structure of a magnetic field is triggerable.
  • the pulse generator circuit is such constructed that the pulse duration of the current pulse to a value between 10 ⁇ s and 500 ⁇ s and preferably between 10 ⁇ s and 200 ⁇ s is limited.
  • Each of the at least two Magnetizing coils may be assigned a switching element, in which case the device further comprises actuating means has, by means of which the at least two switching elements can be actuated simultaneously.
  • the device is the pulse generator circuit several times, for example four to twelve times, existing, what in Following as “parallel multiplication” or Referred to as “parallelization” of the pulse generator circuit becomes. Thanks to parallel multiplication, the Inductance of the magnetizing coil and the capacity of the Capacitor element are kept small in the resonant circuit. This results in the required short pulse durations of eg 100 ⁇ s; nevertheless, enough high magnetic fields generated to modern, sophisticated magnet systems too magnetize.
  • the Magnetizing pulse For a reduction of heat energy in the Magnetizing coil is released, so is the Magnetizing pulse in its duration to limit.
  • the usual Discharge circuit with freewheeling diode sets a substantial Proportion of the pulse energy stored in the capacitor exponentially decaying end of the pulse around. this section but no longer has a magnetizing effect.
  • a novel circuit which in the path of the freewheeling diode a Storage throttle has, can be the exponential Prevent leakage of the current in the magnetizing coil and regain much of the energy in it.
  • the inductive feedback allows the second swing the capacitor voltage and thereby prevents the ohmic Losses due to decaying. The remaining energy charges the capacitor element already for the next pulse again on. Thus, a low energy consumption is achieved, and it No elaborate cooling of the coil is necessary.
  • the second Swinging over the inductive feedback results in a quadruple parallelization of the magnetizing coil one additional energy savings of 43%. Without parallelization, with a single magnetizing coil and the same power, it is only 18%.
  • the pulse generator circuit a return path arranged parallel to the magnetizing coil on which a storage throttle and a direction includes the current pulse blocking diode element.
  • the Storage throttle element is advantageously so dimensioned that together with the storage capacitor forms a resonant circuit whose period is greater as the corresponding one of the magnetizing circuit.
  • the electromagnetic resonant circuit can by an already magnetized permanent magnet, preferably a NdFeB magnet, get supported. This one will be in the Magnetizing coil inserted in such a way that its field that of Coil superimposed and reinforcing effect.
  • the inventive device can be with about 1000 V operate, reducing the requirements for the paint insulation (125 V per turn with 8 turns) between individual Wire windings in the magnetizing coil still in the unproblematic area lie.
  • As energy storage preferably pulse-resistant capacitors with metallized Plastic film used. These have a low Self-inductance, what the characteristics of the resonant circuit less influenced. For switching the voltages and currents come z.
  • FIG. 1 shows very schematically important elements of a preferred embodiment of the device 1 according to the invention.
  • the device 1 includes a plurality of preferably identical pulse generator circuits 2.1-2.4. In the embodiment of Figure 1, four such pulse generator circuits 2.1-2.4 are indicated; but it can also be more or less.
  • Each pulse generator circuit 2.1-2.4 has a capacitor element 21, preferably a foil capacitor, and a magnetizing coil 22 electrically connected to the capacitor element 21.
  • Each pulse generator circuit 2.1-2.4 also has a switching element 23, for example a thyristor, by the actuation of which a pulse-like discharge of the capacitor element 21 via the magnetizing coil 22 and thus the establishment of a magnetic field in the magnetizing coil 22 can be triggered.
  • the device 1 further comprises actuating means 3, by means of which the switching elements 23 of the at least two pulse generator circuits 2.1-2.4 are simultaneously actuated.
  • actuating means are known in the art; see, for. B. Werner Lücking, "Thyristor basic circuits: Manual for training, study and practice", VDE-Verlag, 1984.
  • the pulse generator circuits 2.1-2.4 and in particular the Magnetisierspulen 22 are mutually arranged so that their magnetic fields superimpose reinforcing. Details of the pulse generator circuits 2.1-2.4 will be discussed further with reference to FIG.
  • FIG. 2 shows a preferred embodiment of a pulse generator circuit 2 for the device 1 according to the invention.
  • the capacitor 21 having a capacitance C
  • magnetizing coil 22 having an inductance L and thyristor 23 and introduced already on the basis of FIG Inductance L 2
  • the magnetizing coil 22 an inner resistor R 1 and the thyristor 23 and the electrical lines connecting these elements an internal resistance R 2 .
  • the pulse generator circuit 2 is designed and dimensioned such that the discharge of the capacitor element 21 has a pulse duration of approximately 10-500 ⁇ s and preferably approximately 10-200 ⁇ s. To achieve such short pulse durations, the values of C and L must be small. It may, for example, apply: 1 ⁇ H ⁇ L ⁇ 15 ⁇ H and 15 ⁇ F ⁇ C ⁇ 150 ⁇ F, and preferably 2 ⁇ H ⁇ L ⁇ 8 ⁇ H and 30 ⁇ F ⁇ C ⁇ 75 ⁇ F. In order to build up sufficiently high magnetic fields despite the small L and C values, preferably the pulse generator circuit 2 or parts thereof are multiplied in parallel, as illustrated and explained with reference to FIG.
  • the at least one capacitor element 21 should be chargeable with voltages ⁇ C of approximately 100-5000 V and preferably approximately 1200-2000 V.
  • the pulse generator circuit 2 should allow discharge currents iL 1 of approximately 1-10 kA and preferably approximately 2-5 kA.
  • a return path 24 is arranged parallel to the magnetizing coil 22.
  • This includes a storage inductor coil 25 having an inductance L d and a blocking in the direction of the discharge current pulse diode 26.
  • the storage inductor coil 25 has an internal resistance R d .
  • the storage choke coil 25 is advantageously dimensioned so that it forms a resonant circuit together with the capacitor element 21 whose period is greater, for example. 2 to 1000 times greater and preferably 10 to 100 times greater than the corresponding period of the Magnetisiernikes without return path 24.
  • a storage choke coil 25 is preferably selected, which has an inductance L d , which is 2 to 1000 times larger and preferably 10 to 100 times greater than the inductance L 1 of the magnetizing coil, z , B. 10 ⁇ H ⁇ L d ⁇ 150 ⁇ H.
  • the different phases of the temporal sequence are for Clarification by three vertical lines from each other demarcated.
  • the switching element 23 of the device 1 according to the invention may, instead of the thyristor shown by way of example in FIG. 2, also comprise an insulated gate bipolar transistor 4 (insulated gate bipolar transistor, IGBT). Such a switching element 23 is shown by way of example in FIG .
  • the collector C of the IGBT 4 is electrically connected to the magnetizing coil 22. Between the magnetizing coil and the IGBT, a diode 41 blocking the direction of the discharge current pulse may optionally be connected.
  • the gate G of the IGBT 4 is driven by a drive device 42.
  • the drive unit 42 has an ignition input 43 for an ignition pulse.
  • a current sensor 44 is installed, the signal of which is fed via a sensor input 45 into the drive unit 42. If the emitter current I E is positive and a firing pulse is present, the IGBT 4 should let through; otherwise the IGBT 4 should lock.
  • FIG. 5 shows a preferred arrangement of magnetizing coils 22.1-22.8 in the device 1 according to the invention in a plan view.
  • FIG. 6 shows a cross section along the line VI-VI in FIG. 5.
  • eight magnetizing coils 22.1 to 22.8 having different diameters are nested one inside the other.
  • Each magnetizing coil 22.1-22.8 has, for example, six turns. It is also possible to use magnetizing coils with bifilar or multifilar windings.
  • the magnetizing coils 22.1-22.8 may be rectangular, square or round or have other geometries.
  • the arrangement can be completed on both sides by an epoxy glass plate 27.1, 27.2.
  • the inner or outer diameter of such an arrangement depends on the particular application and is typically in the range of a few to a few hundred centimeters.
  • the resulting magnetic field B ie the superposition of the magnetic fields built up in the eight magnetizing coils 22.1-22.8, is indicated by an arrow.
  • the arrangement is z. B. positioned on the surface of a magnetic system to be magnetized 8, such that the largest possible part of the magnetic field B can interact with the material of the magnetic system 8. If the magnet system 8 is accessible, at least partially, from the sides, the arrangement is preferably positioned such that the magnetizing coils 22.1-22.8 surround, at least partially, the magnet system 8. This allows an even more efficient magnetization to be achieved.
  • the Magnetizing coils 22.1-22.8 also the same diameter have and be arranged one above the other.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Treatment Devices (AREA)
  • Relay Circuits (AREA)
EP04405528.3A 2003-09-02 2004-08-24 Méthode et dispositif de magnétisation d'un système magnétique Expired - Lifetime EP1513168B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH15062003 2003-09-02
CH150603 2003-09-02

Publications (3)

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EP1513168A2 true EP1513168A2 (fr) 2005-03-09
EP1513168A3 EP1513168A3 (fr) 2008-07-02
EP1513168B1 EP1513168B1 (fr) 2017-03-08

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EP (1) EP1513168B1 (fr)

Cited By (1)

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WO2006132897A1 (fr) * 2005-06-03 2006-12-14 Sensormatic Electronics Corporation Techniques permettant de desactiver des etiquettes electroniques de surveillance d'articles

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US6896826B2 (en) * 1997-01-09 2005-05-24 Advanced Technology Materials, Inc. Aqueous cleaning composition containing copper-specific corrosion inhibitor for cleaning inorganic residues on semiconductor substrate
TWI227502B (en) 2003-09-02 2005-02-01 Ind Tech Res Inst Precise multi-pole magnetic components and manufacturing method thereof
US9371923B2 (en) 2008-04-04 2016-06-21 Correlated Magnetics Research, Llc Magnetic valve assembly
US8760250B2 (en) 2009-06-02 2014-06-24 Correlated Magnetics Rsearch, LLC. System and method for energy generation
US8816805B2 (en) 2008-04-04 2014-08-26 Correlated Magnetics Research, Llc. Magnetic structure production
US8179219B2 (en) 2008-04-04 2012-05-15 Correlated Magnetics Research, Llc Field emission system and method
US9404776B2 (en) 2009-06-02 2016-08-02 Correlated Magnetics Research, Llc. System and method for tailoring polarity transitions of magnetic structures
US8704626B2 (en) 2010-05-10 2014-04-22 Correlated Magnetics Research, Llc System and method for moving an object
US9711268B2 (en) 2009-09-22 2017-07-18 Correlated Magnetics Research, Llc System and method for tailoring magnetic forces
US8362863B2 (en) 2011-01-14 2013-01-29 General Electric Company System and method for magnetization of rare-earth permanent magnets
US9245677B2 (en) 2012-08-06 2016-01-26 Correlated Magnetics Research, Llc. System for concentrating and controlling magnetic flux of a multi-pole magnetic structure
CN106681422B (zh) * 2016-12-14 2018-02-02 中国人民解放军国防科学技术大学 电参数在线可调的磁开关及电参数调节方法
US10586639B2 (en) 2017-01-04 2020-03-10 Wisk Aero Llc Array of three pole magnets
US11289962B2 (en) * 2017-01-04 2022-03-29 Wisk Aero Llc Method of rotor production including co-curing and magnetization in place
USD949106S1 (en) * 2019-11-18 2022-04-19 Maurer Magnetic Ag Demagnetization apparatus

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US5469321A (en) * 1992-11-13 1995-11-21 Stupak, Jr.; Joseph J. Magnetizing device having variable charge storage network and voltage control
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Publication number Priority date Publication date Assignee Title
WO2006132897A1 (fr) * 2005-06-03 2006-12-14 Sensormatic Electronics Corporation Techniques permettant de desactiver des etiquettes electroniques de surveillance d'articles
AU2006255614B2 (en) * 2005-06-03 2011-08-04 Sensormatic Electronics Llc Techniques for deactivating electronic article surveillance labels using energy recovery
CN101223556B (zh) * 2005-06-03 2014-05-07 传感电子公司 用于使用能量恢复去激活电子商品防盗标签的技术

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Publication number Publication date
EP1513168B1 (fr) 2017-03-08
US7324320B2 (en) 2008-01-29
US20050195058A1 (en) 2005-09-08
EP1513168A3 (fr) 2008-07-02

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