WO2022128685A1 - Elektronische schaltvorrichtung zum entmagnetisieren von ferromagnetischem material - Google Patents
Elektronische schaltvorrichtung zum entmagnetisieren von ferromagnetischem material Download PDFInfo
- Publication number
- WO2022128685A1 WO2022128685A1 PCT/EP2021/084793 EP2021084793W WO2022128685A1 WO 2022128685 A1 WO2022128685 A1 WO 2022128685A1 EP 2021084793 W EP2021084793 W EP 2021084793W WO 2022128685 A1 WO2022128685 A1 WO 2022128685A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recharging
- circuit
- demagnetizing
- switch
- oscillating circuit
- Prior art date
Links
- 239000003302 ferromagnetic material Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 32
- 230000010355 oscillation Effects 0.000 claims abstract description 28
- 239000004020 conductor Substances 0.000 claims abstract description 24
- 230000005291 magnetic effect Effects 0.000 claims abstract description 12
- 230000002035 prolonged effect Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000005672 electromagnetic field Effects 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 230000005347 demagnetization Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- 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
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
Definitions
- the invention relates to an electronic switching device for demagnetizing ferromagnetic material by means of resonance oscillation with a prolonged decay time.
- This includes a voltage source and a conductor loop connected to it, in which a demagnetizing oscillating circuit is arranged to form a decaying, alternating magnetic field in which ferromagnetic material can be demagnetized during a decay time.
- the switching device is operable with a controller for controlling the voltage source and all switches.
- demagnetizing ferromagnetic bodies As a rule, alternating magnetic fields with a degressive amplitude are used. These magnetic fields are generated with conductor coils, also called demagnetizing coils, through which an electric current flows according to the desired strength of the magnetic field.
- the degaussing coil and the body to be degaussed are generally in a mutually fixed position relative to one another during the degaussing process.
- the aim is to generate a sinusoidal current curve.
- the easiest way to achieve this is with an electric oscillating circuit working in resonance, as described at the outset.
- a crucial disadvantage of such degaussing circuits is that the amplitude for the degaussing current decreases too quickly, resulting in a lack of effectiveness of this circuit in the degaussing process.
- This degradation which is defined by the decrement in current and voltage in the oscillating circuit, is specified in the design of the degaussing coil for physical and material reasons. It consists of the losses given by the copper resistance of the Degaussing coil, defined by its dimensions and structure as well as by the hysteresis and eddy current losses in the body to be degaussed.
- EP 0597181 also deals with a method for demagnetizing magnetic materials in a decaying alternating magnetic field.
- a parallel resonant circuit comprising two coils and a capacitor, into which energy is fed synchronously to the magnetic interaction in order to lengthen the decay time.
- a complex circuit with a sine-wave converter, a square-wave generator and a monoflop is proposed in order to introduce energy clocked from a recharging capacitor into the capacitor of the parallel resonant circuit.
- the switching device according to the invention can be operated with a single power source and/or that it can do without components that include integrated circuits (IC).
- IC integrated circuits
- a switching device described in the introduction also comprises
- a recharging resonant circuit in the conductor loop arranged parallel to the demagnetizing resonant circuit and to the resonant circuit charging switch, for pulsed recharging of a charging current into the demagnetizing resonant circuit when the resonant circuit charging switch is closed,
- an afterloading memory which is arranged parallel to the voltage source, to the afterloading oscillating circuit and to the demagnetizing oscillating circuit, to supply energy to the afterloading oscillating circuit during the decay time
- a recharging switch in the conductor loop for interrupting a charging current from the voltage source and from the recharging memory to the recharging oscillating circuit and to the demagnetizing oscillating circuit
- a charging switch for interrupting the charge source to the recharging memory, to the recharging oscillating circuit and to the demagnetizing oscillating circuit, with recharging pulses being able to be brought from the recharging oscillating circuit into the demagnetizing oscillating circuit during operation by means of a controller by opening and closing the switches, for extension the cooldown time until the energy from the reload storage is used up.
- the demagnetizing oscillating circuit, the resonant circuit and the reloading memory can be charged at the beginning of the process by the voltage source, which is then decoupled by a switch.
- the resonant oscillation of the demagnetizing oscillating circuit is then set in motion and periodically, preferably after the zero crossing of the oscillating circuit voltage, one or more recharging pulses from the recharging oscillating circuit are introduced into the resonant oscillation.
- the afterloading resonant circuit is loaded again by the afterloading memory so that it is ready to deliver the next pulse. This is repeated until the reload memory is exhausted. Thanks to these surges of energy, the decay time of the resonance vibration increases.
- a second oscillating circuit is used as the recharging oscillating circuit.
- the charge can be swapped with a polarity switch so that it can emit reloading impulses in the positive and negative direction, although it is always charged the same way by the reloading store.
- a polarity reversing switch could also be arranged between the recharging memory and the resonant resonant circuit, which always charges the resonant resonant circuit in alternating directions.
- FIG. 1 shows a schematic representation of an electronic circuit for generating a decaying resonant oscillation
- Fig. 2 is a representation of a decaying resonance vibration according to FIG. 1 in time
- FIG. 3 shows a section of the oscillation from FIG. 2 under the influence of recharging pulses
- Fig. 4 is a schematic representation of an inventive electronic circuit for
- FIG 5 shows the circuit according to claim 4 in a preferred embodiment.
- FIG. 1 shows a schematic representation of an electronic circuit 10 according to the invention for demagnetizing ferromagnetic material.
- the circuit 10 comprises a degaussing coil 41 and an oscillating circuit capacitor 42 which are connected via an oscillating circuit switch 43 to form a degaussing oscillating circuit 40 .
- the resonant circuit switch 43 is open.
- the demagnetizing oscillating circuit 40 is connected via a conductor loop 30 to a power source 20 which can charge the oscillating circuit capacitor 42 .
- the charging process can be interrupted via an oscillating circuit charging switch 31 .
- the oscillating circuit charging switch 31 When this charging process with the oscillating circuit voltage A is completed, the oscillating circuit charging switch 31 is opened and the charging current is thus interrupted. After the oscillating circuit switch 43 is closed, a resonant oscillation is set in motion: the oscillating circuit capacitor 42 discharges via the degaussing coil 41. The current in the oscillating circuit corresponds to an oscillation with an exponentially decaying amplitude that runs out freely in the natural frequency. 2 shows the resonant oscillation in this demagnetizing oscillating circuit 40 in the form of the curves of oscillating circuit voltage A and demagnetizing current B over time t.
- the oscillating circuit switch 43 is opened again and the circuit 10 is available for a next demagnetizing cycle, which begins again when the oscillating circuit charging switch 31 is closed.
- FIG. 3 shows a section of the decay process from FIG. 2 with an oscillating circuit voltage A and a demagnetizing current B, with recharging pulses C being introduced at regular time intervals with a recharging current shown above.
- the latter are bipolar current pulses that are fed in at the instant immediately after the zero crossing D of the resonant circuit voltage A. Due to the additional energy fed in, the decay is delayed, so the amplitudes of the resonant circuit voltage A and the demagnetizing current B drop more slowly.
- This principle is known, but it has been shown that the implementation of it is complicated in terms of circuitry.
- Embodiments according to the invention are shown in general form in FIG. 4 and in a preferred version in FIG. In Fig. 5, the components 40, 50 and 60 are shown as examples in electronic parts. Optionally, only some of them can be configured in this form.
- 4 shows an electronic circuit 10 for degaussing ferromagnetic material by a resonance oscillation with a prolonged decay time. It comprises a voltage source 20 and a conductor loop 30 connected to it, in which a demagnetizing oscillating circuit 40 is connected to form a decaying, alternating magnetic field in which ferromagnetic material can be demagnetized during a decay time t.
- This demagnetizing oscillating circuit 40 can be constructed as described in FIG. This was shown in FIG. 5 as an example.
- demagnetizing oscillating circuits 40 are also known. Together with the oscillating circuit charging switch 31, which is arranged in series with the demagnetizing oscillating circuit 40 in the conductor loop 30, the demagnetizing method described in FIG. 1 can be carried out.
- the electronic circuit 10 also includes a recharging oscillating circuit 50 in the conductor loop 30 which is arranged in parallel with the demagnetizing oscillating circuit 40 and the oscillating circuit charging switch 31 . It is used for the pulsed recharging of a charging current in the demagnetizing oscillating circuit 40 when the oscillating circuit charging switch 31 is closed for a short time.
- energy stored in the recharging oscillating circuit 50 can be charged at regular time intervals as short recharging pulses C in the degaussing oscillating circuit 40 can be initiated.
- the term "short" refers to the much shorter time period t compared to a total period of resonant oscillation in the degaussing tank circuit 40 as illustrated in FIGS.
- the natural frequency of recharging oscillating circuit 50 is at least 10, preferably at least 100 times greater than the natural frequency of demagnetizing oscillating circuit 40.
- the conductor loop 30 of the electronic circuit 10 includes a recharging memory 60 which is arranged in parallel with the voltage source 20, the recharging oscillating circuit 50 and the demagnetizing oscillating circuit 40. It is intended to supply energy to the resonant circuit 50 during the decay time t.
- a recharging switch 32 is arranged in the conductor loop 30 which, when it is open, interrupts the charging current from the voltage source 20 and from the recharging memory 60 to the recharging oscillating circuit 50 and to the demagnetizing oscillating circuit 40 .
- the electronic circuit 10 in the conductor loop 30 includes a charging switch 33 which interrupts the connection from the charge source 20 to the recharging memory 60, the recharging oscillating circuit 50 and the demagnetizing oscillating circuit 40 when it is opened. Accordingly, the charging switch 33 decouples the charge source 20 from the rest of the electronic circuit 10.
- a controller 70 controls all switches 31, 32, 33, 43, 53 and, by opening and closing the switches 31, 32, 53, can introduce recharging pulses C from the recharging oscillating circuit 50 into the demagnetizing oscillating circuit 40 in order to extend the decay time. until the energy from the reloading memory 60 is used up.
- a rectifier diode 34 is preferably arranged in the conductor loop 30 in series with the voltage source 20 and the charging switch 33 in such a way that during use they prevent feedback from the recharging memory 60, from the recharging oscillating circuit 50 and from the demagnetizing oscillating circuit 40 into the voltage source 20 can.
- the degaussing process can begin. No further energy is introduced from the voltage source 20 until the end of this process.
- the charging switch 33 remains open during this time, the voltage source 20 therefore remains decoupled from the rest of the circuit 10.
- the reloading memory 60 contains all of the energy that can be reloaded until the resonance oscillation of the demagnetizing oscillating circuit 40 has decayed. It includes, for example, a storage capacitor 62, as shown in FIG. In this way it can be achieved that only a single voltage source 20 is needed.
- the capacitance of the storage capacitor 62 is preferably at least twice as large, preferably at least three times as large as that of the resonant circuit capacitor 42.
- controller 70 which preferably also controls voltage source 20. In addition, further switches can be controlled by this controller 70 .
- the controller 70 may be separate from the circuit 10 or part of it.
- the oscillating circuit charging switch 31 is briefly opened after the resonant oscillation in the demagnetizing oscillating circuit 40 has begun and the oscillating circuit voltage A has passed through the zero point D.
- the recharging oscillating circuit 50 now delivers its recharging pulse C to the demagnetizing oscillating circuit 40 .
- the resonant circuit charging switch 31 is closed again.
- the recharging resonant circuit 50 is now charged by opening the recharging switch 32 by a current flowing from the recharging memory 60 .
- the recharge switch 32 is closed again.
- the recharging oscillating circuit 50 is again ready to emit another recharging pulse C to it.
- the controller 70 opens the oscillating circuit charging switch 31 again briefly at the right point in time, much shorter than a quarter period of the resonance oscillation. This process is repeated until the energy in the reloading memory 60 is exhausted.
- resonant circuit 50 preferably includes a recharging coil 51 and a recharging capacitor 52 arranged in series therewith.
- a polarity reversing switch 53 can preferably be arranged parallel to the recharging coil 51 and to the recharging capacitor 52, for reversing the polarity of the charge in the recharging capacitor 52 during a half-oscillation. After every second charge of the recharging capacitor 52, the reversing switch 53 is opened during a half-cycle so that the polarity in the recharging capacitor 52 changes.
- a cross switch can also be provided between the recharging memory 60 and the recharging oscillating circuit 50 in order to charge the recharging capacitor 52 in the opposite direction with every second charge.
- an electronic circuit 10 described here is used to demagnetize ferromagnetic material during a decay time.
- the degaussing oscillating circuit 40, the recharging oscillating circuit 50 and the recharging memory 60 are charged by the voltage source 20, while the charging switch 33, the recharging switch 32 and the oscillating circuit charging switch 31 are closed.
- the recharging resonant circuit 50 is then charged by the recharging memory 60 by briefly closing and opening the recharging switch 32 . The last two steps are repeated until the energy reserve in the reloading memory 60 is exhausted.
- each first recharging pulse C is followed by one or more further short recharging pulses C with the same sign and are transmitted to the demagnetizing oscillating circuit 40 .
- the total duration of the series of recharging pulses C is at most a quarter, preferably at most an eighth, of an oscillation period of the demagnetizing oscillating circuit 40.
- Each first recharging pulse C preferably flows into the resonant oscillation of the demagnetizing resonant circuit 40 directly after a zero crossing of the resonant circuit voltage A. Since the resonant circuit voltage A changes the sign as a result, the sign of each next first recharging pulse C must also be changed accordingly.
- -Resonant circuit 50 is provided with a reversing switch 53.
- the polarity reversal switch 53 is closed, resulting in a resonant oscillation of the capacitor 52 and the recharging coil 51 in the recharging resonant circuit 50, which is interrupted again after a half-oscillation by opening the polarity reversal switch 53.
- Each first recharging pulse C therefore preferably begins exactly half a period of the resonant oscillation of the demagnetizing oscillating circuit 40 later than the preceding first recharging pulse C.
- a ferromagnetic workpiece is brought into the effective range of the demagnetizing oscillating circuit 40 in order to demagnetize it. If necessary, the process described here can be repeated several times.
- the circuit 10 described here and the method carried out with it allow simple and reliable demagnetization of ferromagnetic bodies.
- the circuit consists of simple components that allow for a safe, trouble-free process.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180085632.0A CN116648763A (zh) | 2020-12-17 | 2021-12-08 | 用于铁磁性材料消磁的电子开关装置 |
EP21834781.3A EP4264649A1 (de) | 2020-12-17 | 2021-12-08 | Elektronische schaltvorrichtung zum entmagnetisieren von ferromagnetischem material |
US18/036,943 US20230420171A1 (en) | 2020-12-17 | 2021-12-08 | Electronic switching device for demagnetizing ferromagnetic material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01609/20A CH718185A1 (de) | 2020-12-17 | 2020-12-17 | Elektronische Schaltvorrichtung und Verfahren zum Entmagnetisieren von ferromagnetischem Material. |
CH01609/20 | 2020-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022128685A1 true WO2022128685A1 (de) | 2022-06-23 |
Family
ID=74141214
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/084793 WO2022128685A1 (de) | 2020-12-17 | 2021-12-08 | Elektronische schaltvorrichtung zum entmagnetisieren von ferromagnetischem material |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230420171A1 (de) |
EP (1) | EP4264649A1 (de) |
CN (1) | CN116648763A (de) |
CH (1) | CH718185A1 (de) |
WO (1) | WO2022128685A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0021274A1 (de) | 1979-06-25 | 1981-01-07 | RIV-SKF OFFICINE DI VILLAR PEROSA S.p.A | Entmagnetisierungsvorrichtung |
US4599673A (en) | 1984-12-03 | 1986-07-08 | Rca Corporation | Degaussing system arrangements |
EP0597181A1 (de) | 1992-11-07 | 1994-05-18 | Felten & Guilleaume Energietechnik AG | Verfahren und Vorrichtung zum Entmagnetisieren von magnetischen Werkstoffen |
US20050275507A1 (en) * | 2004-06-10 | 2005-12-15 | Hall Stewart E | Deactivator using resonant recharge |
-
2020
- 2020-12-17 CH CH01609/20A patent/CH718185A1/de unknown
-
2021
- 2021-12-08 WO PCT/EP2021/084793 patent/WO2022128685A1/de active Application Filing
- 2021-12-08 EP EP21834781.3A patent/EP4264649A1/de active Pending
- 2021-12-08 US US18/036,943 patent/US20230420171A1/en active Pending
- 2021-12-08 CN CN202180085632.0A patent/CN116648763A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0021274A1 (de) | 1979-06-25 | 1981-01-07 | RIV-SKF OFFICINE DI VILLAR PEROSA S.p.A | Entmagnetisierungsvorrichtung |
US4599673A (en) | 1984-12-03 | 1986-07-08 | Rca Corporation | Degaussing system arrangements |
EP0597181A1 (de) | 1992-11-07 | 1994-05-18 | Felten & Guilleaume Energietechnik AG | Verfahren und Vorrichtung zum Entmagnetisieren von magnetischen Werkstoffen |
US20050275507A1 (en) * | 2004-06-10 | 2005-12-15 | Hall Stewart E | Deactivator using resonant recharge |
Also Published As
Publication number | Publication date |
---|---|
CH718185A1 (de) | 2022-06-30 |
CN116648763A (zh) | 2023-08-25 |
EP4264649A1 (de) | 2023-10-25 |
US20230420171A1 (en) | 2023-12-28 |
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