EP1824618B1 - Method for braking a running metal strip and unit for carrying out the method - Google Patents

Abstract

The method and unit for braking a metal strip (1), running off a wind-out coiler (2.1) in the form of a coil (1.1) and running onto a wind-on coiler (2.2) again, are to guarantee that a surface of the metal strip remains undamaged and a full effective braking force is exerted on the metal strip (1) by means of an eddy current brake (3.1) with a rotating magnet system (3.2). The above is achieved, whereby the braking force is exerted on the metal strip (1) by means of an induced counter-torque against a support bearing (4) to one side in a non-contact manner, whereby the support bearing (4) may be embodied as a counter roller (4.1).

Description

Technical area

The invention relates to a method for braking a metal strip, which runs from a decoiler and runs up onto a take-up reel. The invention further relates to a system for carrying out the method, in which the deceleration takes place by means of an eddy current brake. The eddy currents to be induced are generated by a rotating magnet system.

State of the art

When slitting a rolled metal strip with circular knife scissors are known to be used in the strip running direction the circular knives scissors downstream braking units, which decelerate with friction and slip as possible, the current metal strip in case of need.

In known band-longitudinal units, the brake unit consists of a main brake and / or a preliminary brake. The main brake consists of groups of individually braked rings, which are entwined by the longitudinally divided strips of the bands in the manner of an S-roller set. To transfer braking torque from these brake rings to the strips, a pre-brake is still provided. As a pre-brake, the type of eddy current brake is suitable. Eddy current brakes, however, have so far the disadvantage that they only at very conductive metal bands such as aluminum or non-ferrous metal can apply a sufficient braking effect.

It was in a known tape longitudinal plant according to the DE-OS 23 06 029 for slitting a rolled metal strip of scissors equipped with circular blade discs downstream of a two-stage brake unit. This unit has disadvantages and has an increased wear, does not preclude scratching the surfaces of the metal strip and does not give the metal strip sufficient lateral guidance.

To overcome these disadvantages, the invention according to the DE 195 40 748 C2 create a band longitudinal section with braking means, in which act on the strips in the wrap of the brake rings pressing means either without contact or on the side facing away from the brake rings with contact, both with and without transfer of braking force to the strip attack slip.

This way now wants to exclude the present invention because of the relatively complex elements of the brake unit and investigate to what extent the pursuit of the principle of action of the eddy current brake leads to a more useful solution to the deceleration of running metal bands.

The analysis of the prior art shows that it has been tried, according to the teaching of the DE 195 24 289 C2 to design a device for braking electrically conductive bands by means of eddy current effect, in which the magnetic field generating device comprises at least one opposite of the conveying direction rotatable magnet roller.

• Zuordnung einer weiteren Magnetrolle mit Abstand an der Unterseite des Bandes,
• veränderbarer Abstand der Magnetrollen,
• Magnetrollen mit Elektromagneten,

zugleich eine technisch/technologisch brauchbare, Realisierung.Although this solution seems to go in the right direction, it does build on the further design, such as

• Assignment of another magnet roller at a distance at the bottom of the band,
• variable distance of the magnetic rollers,
• Magnetic rolls with electromagnets,

at the same time a technically / technologically usable, realization.

It has been found disadvantageous in practice that the non-contact introduction of the braking torques due to the induced eddy currents from rotating magnet rollers can not exert an actual braking effect. The (variable and by the eddy currents also changing) distance of the magnetic rollers prevents the effective initiation of braking torque.

This is demonstrated by the following effects:

When using a magnetic roller, there is the problem that the tape is pushed out of the magnetic field and the eddy current brake is ineffective. If, on the other hand, two magnet rollers are provided, mutual interference of the magnet system takes place (possibly with disadvantageous heating), whereby no mechanical force can be transmitted to the band and even torsion in the longitudinal direction can occur and at a small distance the band rubs against the magnet roller as well a large distance also no braking effect is transmitted.

Thus, the problem is not solved by the use of magnetic rollers against static eddy current generators, without wanting to manage additional braking means.

Even if one the patent teaching after the DE 195 24 289 C2 expanded, so for example with respect to the lower second magnet roller, no approach can be found to avoid the problems and disadvantages shown; Rather, there is also the fact that due to the tendency to twist the bands about the axis in the conveying direction, the lower magnet roller acts as a quasi impact surface and anyway does not fulfill the intended function.

Furthermore, with the use of two magnetic rollers with respect to the variable distance, it can be noted that at a small distance, damage to the tape may occur and at a large distance due to the too small magnetic field no effective braking force is applied or an oversized magnet system is required.

Presentation of the invention

The invention therefore has the task of providing a method and a system for braking a metal strip, which runs from a decoiler as a coil and runs on a take-up reel to create by means of a brake unit with an eddy current brake as a rotating magnet system, on the one hand ensures that the Surface of the metal strip is not damaged and on the other hand exerts a fully effective braking force on the metal strip. It should be dispensed with additional brakes, the system as a whole have a simple structure and the braking effect done on one side contactless. It is intended that the current induced in the magnetic field by the magnetic alternating field in the metal strip to be braked generates a counter-momentum on the metal strip, which effect was previously unusable without any disadvantages as a braking torque for the aforementioned systems.

According to the invention this is achieved by the method having the features of claim 1. The inventive feature according to claim 2 complements the effect of the method. In claims 3 to 10 advantageous embodiments of the method are given. For carrying out the method, a system having the features according to claim 11 is proposed. The feature in claim 12 further expands the system according to the invention. The features of claims 13 to 23 are advantageous embodiments of the system in order to carry out the process maximum.

Although the invention with the rotating magnet system the part of an already according to the DE 195 24 289 C2 The principle of the present invention is not obvious. Only through the invention can surprisingly and effectively be realized by means of the principle of a arranged below the metal strip contacting abutment as a counter-roll a useful solution.

With a rotating magnet system alone, until now no effective counter-pull with full braking effect on the metal strip without further braking units could be generated practically and space-savingly by the counter-torque induced by the torque of the eddy current DE 195 24 289 C2 therefore could not be taken as a suggestion.

1. 1. Das Gegenlager mittels der Gegenrolle zwingt zu einer einseitig berührungslosen Bremsung. Nach dem zitierten Stand der Technik hingegen ist einerseits durch das auf das Band in vertikaler Richtung wirkende Magnetfeld (Bremskraft) das Band bestrebt, sich von der Magnetrolle zu entfernen und somit das Magnetfeld zu verlassen, andererseits befindet sich das Metallband immer im Magnetfeld, welcher Umstand gerade bei langsamen Badgeschwindigkeiten sehr problematisch ist und letztendlich den praktischen Einsatz des Bremssystems bisher nicht gewährleistet hat.
   Durch die Verwendung der verstellbaren Gegenrolle (der Abstand zwischen Band und Magnetrolle ist einstellbar) kann schnell und präzise das wirkende Magnetfeld der Wirbelstrombremse auf das zu bremsende Metallband verändert werden.
   Es kann dabei ein Einstellbereich von 0 - 100% des maximalen zur Verfügung stehenden Magnetfeldes ausgeschöpft werden.
   Durch diese Option ist sowohl die Bremskraft als auch die Erwärmung des Metallbandes jedem erforderlichen Betriebsparameter anpassbar.
   Diese Möglichkeit bot der bisher offenbarte Stand der Technik nicht.
   Die erfindungsgemäße Gegenrolle verhindert dies und erzeugt eine entsprechende Gegenkraft, was die Funktion der Verwendung einer Magnetrolle zur Ausübung von Bremskräften überhaupt erst gewährleistet.
   Weiterhin diese Funktion unterstützend soll die Gegenrolle aus elektrisch und magnetisch nicht leitfähigem Material bestehen.
   Die Regelung der Bremskraft kann erfindungsgemäß zusätzlich auch über die räumliche Veränderung (Abstand) der Gegenrolle zur Magnetrolle (hier das rotierende Magnetsystem) erfolgen.
   Gleichzeitig bewirkt die Vertikalkraft eine Glättung der zur Verdrehung neigenden abzubremsenden Metallbänder und ermöglicht dadurch eine Minimierung des Luftspalts zwischen rotierendendem Magnetsystem und Band, wodurch neben der effektiven Bremswirkung eine entsprechend kleine und kompakte Bauweise ermöglicht wird.
2. 2. Die hauptsächliche Reglung der Drehzahl zur Steuerung der Bremskraft wird über die Einstellung der Drehzahl des rotierenden Polsystems durch einen Frequenzumrichter vorgenommen.
3. 3. Die Steuerung der Bremskraft erfolgt durch einen geschlossenen Regelkreis mittels Einsatz und Verwendung von Messaufnehmen zur Bandzugmessung und Bildung eines Regelkreises mit dem Frequenzumrichter des Motors für das ausschließlich mit Permanentmagneten bestückte rotierende Magnetsystem. Somit ist über die Steuerung eine Einstellung der erforderlichen Bremskraft genau und einfach realisierbar.
4. 4. Entgegen dem Stand der Technik ist erfindungsgemäß ein VA Mantel um das rotierende Magnetsystem zur Aufnahme der Fliehkräfte der Permanentmagnete vorgesehen und nicht wie nach dem zitierten Stand der Technik der nachteilige Mantel aus nicht leitfähigem Material (Kunststoff). Der VA Mantel gewährleistet, dass die entstehenden Fliehkräfte der durch Permanentmagnete und nicht Elektromagnete bestückten Rolle durch die Rotation des Magnetsystems bei hoher Drehzahl aufgenommen werden können. Dabei darf das Mantelmaterial zwar elektrisch leitfähig, jedoch nicht magnetisch leitfähig sein.
5. 5. Die Kante an dem rotierenden Magnetsystem gewährleistet die Aufnahme von Tangentialkräften, die auf die einzelnen Permanentmagneten, die sich auf der Poltrommel befinden, wirken. Durch diese Kante ist eine Verschiebung der einzelnen Magnetsegmente nicht möglich und eine dauerhafte Funktion des Bremssystems gewährleistet.

Overall, the following advantageous features and effects associated with the present invention are used, which are also not apparent from the teaching of the closest prior art of the present invention:

1. 1. The counter-bearing by means of the counter-roller forces to a one-sided contactless braking. According to the cited prior art, however, on the one hand by the acting on the tape in the vertical direction magnetic field (braking force), the band strives to move away from the magnet roller and thus leave the magnetic field, on the other hand, the metal band is always in the magnetic field, which circumstance especially at slow bath speeds is very problematic and ultimately has not guaranteed the practical use of the brake system.
   By using the adjustable counter-roller (the distance between the belt and magnet roller is adjustable) can be quickly and precisely changed the magnetic field of the eddy current brake acting on the metal strip to be braked.
   An adjustment range of 0 - 100% of the maximum available magnetic field can be used.
   With this option, both the braking force and the heating of the metal strip can be adapted to any required operating parameters.
   This possibility did not offer the previously disclosed prior art.
   The counter-roller according to the invention prevents this and generates a corresponding counterforce, which ensures the function of using a magnetic roller for the exercise of braking forces in the first place.
   Furthermore, this function supporting the counter-roll should consist of electrically and magnetically non-conductive material.
   The regulation of the braking force according to the invention can also be done via the spatial variation (distance) of the counter-roller to the magnet roller (here the rotating magnet system).
   At the same time, the vertical force causes a smoothing of the twisting metal braces to be braked and thereby enables a minimization of the air gap between rotating Magnetsystem and band, which in addition to the effective braking effect a correspondingly small and compact design is possible.
2. 2. The main control of the brake power control speed is made by adjusting the speed of the rotating pole system by a frequency converter.
3. 3. The control of the braking force is carried out by a closed loop by using and use of Meßaufnehmen for tape tension measurement and formation of a control loop with the frequency converter of the motor for the equipped exclusively with permanent magnets rotating magnet system. Thus, an adjustment of the required braking force can be accurately and easily realized via the controller.
4. 4. Contrary to the prior art, according to the invention a VA jacket is provided around the rotating magnet system for receiving the centrifugal forces of the permanent magnets and not as in the cited prior art, the disadvantageous shell of non-conductive material (plastic). The VA jacket ensures that the centrifugal forces created by the permanent magnets and non-electromagnets can be absorbed by the rotation of the magnet system at high speed. The sheath material may indeed be electrically conductive, but not magnetically conductive.
5. 5. The edge on the rotating magnet system ensures the absorption of tangential forces acting on the individual permanent magnets located on the poling drum. By this edge, a shift of the individual magnet segments is not possible and ensures a permanent function of the brake system.

The thus created in a complex aspect invention is applicable both for simple unwinding / winding systems for metal bands as well as slitting lines of the type described above.

With the invention, the previous disadvantages of eddy current brakes anyway and especially that of rotating Magnctsystemen be eliminated as Wirbetstrombremsung. The Wirbelstrombremsung by means of rotating magnet systems can thus also take over the function of a single main brake, without having to act as a pre-brake.

Brief description of the drawings

Fig. 1

die schematische Darstellung einer erfindungsgemäßen Anlage in Seitenansicht mit Wirbelstrombremse als rotierendes Magnetsystem und einer Gegenrolle als Widerlager,

Fig. 2

die Einzelheit der Anlage nach Fig. 1 mit der schematischen Darstellung der Kante an dem rotierenden Magnetsystem,

Fig. 3

die schematische Darstellung der Anlage nach Fig. 1 mit dem Steuerblock und seinen Verknüpfungen,

Fig. 4

der Regelkreis als einfaches Blockschaltbild.

The invention will be explained in more detail using an exemplary embodiment. In the drawings show

Fig. 1

the schematic representation of a system according to the invention in side view with eddy current brake as a rotating magnet system and a counter-roller as an abutment,

Fig. 2

the detail of the plant Fig. 1 with the schematic representation of the edge on the rotating magnet system,

Fig. 3

the schematic representation of the system after Fig. 1 with the control block and its links,

Fig. 4

the control loop as a simple block diagram.

Best way to carry out the invention

Out FIG. 1 is schematically a slitting line (without showing the necessary separation devices such as circular knife scissors) can be seen in which a metal strip 1 from a coil 1.1 receiving uncoiler 2.1 runs on a take-up reel 2.2.

For braking the metal strip 1, a brake unit 3 is provided as an eddy current brake 3.1, which uses a variable in its speed rotary magnet system 3.2, which is arranged on one side contactlessly over the metal strip 1. As a result of the current induced by the magnetic field, a counter-torque is now generated in the running metal strip 1 by the rotating magnet system 3.2, which counterweight is capable of deploying the fully required braking force alone.

The prerequisite is that below the metal strip 1, an abutment 4 for meeting the avoidance or securing a (non-contact) distance a of the metal strip 1 to the rotating magnet system 3.2 is mounted. This abutment 4 is according to Fig. 1 formed as a counter-roller according to the invention 4.1, which consists of an electrically and magnetically non-conductive material.

The rotating magnet system 4.2 is adjustable in its rotational speed. To achieve all possible effects of the rotating magnet system 4.2 as a braking unit this is adjustable in its spatial position to the metal strip 1.

An optional variant of the invention can also be that the rotating magnet system 3.2 is surrounded by a drum (roll jacket) 3.2.1, wherein the magnet system 3.2 is driven at a higher and higher speed than that of the drum 3.2.1.

It is possible, a continuous adjustment of the rotating magnet system 3.2 in the drum 3.2 eccentric to make the center of the respective drum 3.2.1, pivotally and / or radially adjustable and the distance up to a non-contact distance between the magnet system 3.2 and 3.2 drum .1 infinitely adjustable to provide.

According to Fig. 2 is provided for receiving the tangential forces of only equipped with permanent magnets 3.2.3 rotating magnet system 3.2, an edge 3.2.2.

How out Fig. 1 it can be seen, is provided to the rotating magnet system 3.2, a VA jacket 3.3 for receiving the force acting on the permanent magnets 3.2.3 centrifugal forces.

1. a) eine Datenleitung SPS 6.1,
2. b) ein Eingabemodul 6.2,
3. c) einen Steuerteil mit Zuleitung 6.3 und einem Display 6.4 zur Anzeige von Daten,
4. d) eine erste Ansteuerung 6.5 der Mittel 6 zur Veränderung des Abstands a des Widerlagers 4/ der Gegenrolle 4.1,
5. e) eine zweite Ansteuerung 6.6 eines Motors 3.4 des rotierenden Magnetsystems 3.2 und
6. f) Leitungen 6.7 für die Messung der Geschwindigkeit des Metallbandes 1 und des Bandzuges/der Bremskraft an einer Umlenkrolle 3.5

aufweisen.An unillustrated frequency converter, a control circuit 5 accordingly Fig. 4 and according to Fig. 3 a measurement of the strip tension / the braking force and means 6 for changing the distance a of the abutment 4 / the counter-roller 4.1 are provided, the

1. a) a data line PLC 6.1,
2. b) an input module 6.2,
3. c) a control part with lead 6.3 and a display 6.4 for displaying data,
4. d) a first control 6.5 of the means 6 for changing the distance a of the abutment 4 / the counter-roller 4.1,
5. e) a second control 6.6 of a motor 3.4 of the rotating magnet system 3.2 and
6. f) lines 6.7 for the measurement of the speed of the metal strip 1 and the strip tension / braking force on a guide roller 3.5

exhibit.

With this embodiment, the inventive method can gain the used eddy current brake 3.1 as the main brake. The full braking effect is alone generated by the rotating magnet system 3.2 by means of the counter-roller 4.1 and exerted on the current metal strip 1 as a counter-moment.

Overall, the disadvantages of the prior art described above, such as scratching the surfaces of metal strips, so in anodized Al strips eliminated because the braking effect on the one hand non-contact, adjustable and fully effective to the metal band 1 without S-shaped belt exercisable and on the other hand alone the rotating magnet system 3.2 is generated by means of the counter-roller 4.1.

The method is further carried out so that the braking effect by the rotational speed of the respective magnet system 3.2 is independent of the speed of the metal strip 1 adjustable and thus also adjustable.

According to claims 5 and 6 , other method training can be realized.

According to the method, this can be done independently of the speed of the metal strip 1 by the local adjustment of the respective magnet system 3.2. In this case, the local adjustment of the respective abutment 4.1 can be adjusted or regulated independently of the speed of the metal strip.

• Eingabe/Aufnahme/Ausgabe von Daten zur Einstellung der Geschwindigkeit des Metallbandes,
• Eingabe/Aufnahme/Ausgabe von Daten zur Einstellung der Bremswirkung des rotierenden Magnetsystems 3.2,
• Eingabe/Aufhahme/Ausgabe von Daten zur Einstellung der Rotationsgeschwindigkeit des Magnetsystems 3.2,
• Eingabe/Aufnahme/Ausgabe von Daten zur Verstellung der örtlichen Lage des Magnetsystems 3.2,
• Eingabe/Aufnahme/Ausgabe von Daten zur Einstellung des Luftspaltes a zwischen dem Magnetsystem 3.2, und dem Widerlager 4
• Eingabe/Aufnahme/Ausgabe von Daten aus den Abmessungen der Coils 1.1 und/oder
• Eingabe/Aufnahme/Ausgabe von Daten zur Verstellung der örtlichen Lage des Widerlagers 4

umfasst.The method and the system according to the invention make it possible to realize by means of the rotating magnet system 3.2 a computer-aided program for controlling or rather regulating the deceleration of the rolled metal strip 1, which optionally or cumulatively the program steps

• Input / recording / output of data for adjusting the speed of the metal strip,
• Input / recording / output of data for setting the braking effect of the rotating magnet system 3.2,
• Input / output / output of data for setting the rotational speed of the magnet system 3.2,
• Input / recording / output of data for adjusting the local position of the magnet system 3.2,
• Input / recording / output of data for adjusting the air gap a between the magnet system 3.2, and the abutment. 4
• Input / recording / output of data from the dimensions of coils 1.1 and / or
• Input / recording / output of data for adjusting the local position of the abutment 4

includes.

1. a) Aufnahme /Eingabe der Istwerte aus einer Bremszugmessung und/oder Geschwindigkeitsmessung des Metallbandes 1,
2. b) Eingabe von erforderlichen Sollwerten,
3. c) Ausgabe eines Drehzahlwertes für das rotierende Magnetsystem 3.2,
4. d) Ausgabe eines Abstandswertes a für das rotierende Magnetsystem 3.2 zum Metallband 1,
5. e) Anzeige der Regelwerte auf einem Display 6.4

aufweist.In this case, the control circuit 5 is applicable, according to Fig. 4 the functions

1. a) recording / input of the actual values from a brake cable measurement and / or speed measurement of the metal strip 1,
2. b) input of required setpoints,
3. c) output of a rotational speed value for the rotating magnet system 3.2,
4. d) output of a distance value a for the rotating magnet system 3.2 to the metal strip 1,
5. e) Display of the control values on a display 6.4

having.

The procedure uses the frequency converter to set the speed of the rotating magnet system 3.2.

1. a) ein Vorwahlprogramm mit Datenberechnung aus den eingegebenen Werten von Dicke, Breite, Material, Nutzenzahl und/oder gewünschtem/r Bandzug/Bremskraft des Metallbandes 1 zur Bestimmung des Abstands a der Gegenrolle, der Drehzahl des rotierenden Magnetsystems 3.2,
2. b) eine Regelung des Frequenzumrichters während des laufenden Metallbandes (1) durch Messung des/r Bandzuges/Breinskraft und
3. c) eine Reduzierung des Bandruges/der Bremskraft durch Änderung des Abstands a und/oder der Drehzahl ab einer Bandgeschwindigkeit < eingegebener Geschwindigkeit

ausgebildet.The procedure is through

1. a) a preselection program with data calculation from the entered values of thickness, width, material, number of use and / or desired / r Bandzug / braking force of the metal strip 1 for determining the distance a of the counter-roller, the rotational speed of the rotating magnet system 3.2,
2. b) a control of the frequency converter during the current metal strip (1) by measuring the / R strip tension / Breinskraft and
3. c) a reduction of Bandruges / braking force by changing the distance a and / or the speed from a belt speed <entered speed

educated.

Finally, a control of the induced braking force by fine adjustment of the rotational speed of the pole drum of the rotating magnet system 3.2 is made possible for the practice, wherein the speed is variably adjustable via the frequency converter.

The distance of the counter-roller 4.1 to the rotating magnet system 3.2 is also adjustable by default via an electric motor device, not shown.

The pre-selection program according to claim 12 integrates a data calculation from the input of tape thickness, bandwidth, material, number of useful and desired tape tension to determine the distance of the counter-roller 4.1 and / or the frequency (speed) of the rotating magnet system 3.2. For example, the frequency should be changed if it is outside 40 - 60 Hz.

After the start of the system (start of production), the frequency converter is regulated by measuring the strip tension. In this case, the return train corresponds to a reduction of the braking force / strip tension by changing the distance and / or the rotational speed from a belt speed which is smaller than the jogging speed (for example about 10 m / min). This has the advantage of less heating of the metal bands 1 by the rotating magnet system.

The controller comprises the frequency converter and the control system with the tape tension sensor, the PLC 6.1, the controller e.g. a pneumatic system 6 for setting the counter roller 4.1, the input module 6.2 when exchanging data with the main control of the system, not shown, (definition as interface), whereby no separate input module is required.

A separate control cabinet is conceivable in which as inputs the input module 6.2 with data exchange, a supply line (power supply), measuring line for Bandzugaufnehmer and a measuring line for the belt speed are provided. Outputs are available to pneumatic valves, to the servomotor and to the supply line for the motor 3.4. The input data (as setpoints) and the measured data (as actual values) appear on the display.

Industrial Applicability

Compared to the solution after the DE 195 24 289 C2 However, which represents an unusable in practice device for braking electrically conductive bands by eddy current effect, because the magnetic field generating device was assigned a further opposite the conveying direction rotatable magnet roller, according to the invention, below the metal strip 1, an abutment 4 for meeting the evasion or . Securing a (non-contact) distance a of the metal strip 1 to the rotating magnet system 3.2 is mounted, a proven in practice and surprisingly simple solution presented.

Claims (23)

1. A method for braking a metal strip (1) which runs off as coil (1.1) from a wind-out coiler (2.1) and runs onto a wind-on coiler (2.2) again, by means of a brake assembly (3), comprising an eddy current brake (3.1), with a rotating magnet system (3.2) for the generation of a braking effect exerted onto the metal strip (1) by means of an induced counter-torque to one side in a non-contact manner to the metal strip (1), in which a counter-roller (4.1) touching the metal strip (1) is used as support bearing (4).
2. The method according to Claim 1, characterized by the use of a counter-roller (4.1) comprising electrically and magnetically non-conductive material.
3. The method according to Claim 1 or 2, characterized in that the braking effect is set by the rotation speed of the magnet system (3.2) independently of the speed of the metal strip (1).
4. The method according to any of Claims 1 to 3, characterized in that the braking effect is set by the local adjustment of the magnetic system (3.2) independently of the speed of the metal strip (1).
5. The method according to any of Claims 1 to 4, characterized in that the braking effect is set by the local adjustment of the counter-roller (4.1) independently of the speed of the metal strip (1).
6. The method according to any of Claims 1 to 5, characterized in that the braking effect is set by the local adjustment of the respective magnet system (3.2) inside a drum (3.2.1) independently of the speed of the metal strip (1).
7. The method according to any of Claims 1 to 6 with a computer-based program for controlling/regulating the braking of the rolled metal strip (1), having at least one of the program steps

   - Input/Acquisition/Output of data for setting the speed of the metal strip (1),

   - Input/Acquisition/Output of data for setting the braking effect of the rotating magnet system (3.2),

   - Input/Acquisition/Output of data for setting the rotation speed of the magnet system (3.2),

   - Input/Acquisition/Output of data for setting the local position of the magnet system (3.2),

   - Input/Acquisition/Output of data for setting the air gap as distance (a) between the rotating magnet system (3.2) and the metal strip (1),

   - Input/Acquisition/Output of data from the dimensions of the coils (1.1) and

   - Input/Acquisition/Output of data for adjusting the local position of the abutment (4).
8. The method according to any of Claims 1 to 7 with a computer-based program, characterized by a control circuit (4) having the functions

   a) Acquisition/Input of the actual values from a brake tension measurement and/or speed measurement of the metal strip (1),

   b) Input of necessary rated values,

   c) Output of a rotation speed value for the rotating magnet system (3.2),

   d) Output of a distance value (a) for the rotating magnet system (3.2) to the metal strip (1),

   e) Indication of the regulation values on a display (6.4).
9. The method according to any of Claims 1 to 8, characterized by the use of a frequency converter for setting the rotation speed of the rotating magnet system (3.2).
10. The method according to Claim 9, characterized by

    a) a pre-selection program with data computation from the input values of thickness, width, material, number of blanks and/or desired strip tension/braking force of the metal strip (1) to determine a distance of the counter-roller and/or the rotation speed of the rotating magnet system (3.2),

    b) regulating of the frequency converter during the running metal strip (1) by measuring the strip tension/braking force and

    c) reducing the strip tension/braking force by altering the distance and/or the rotation speed on and after a strip speed < input speed.
11. A unit for carrying out the method according to Claim 1, having a wind-out coiler (2.1) receiving a coil (1.1), a wind-on coiler (2.2) and a brake assembly (3) with an eddy current brake (3.1) as a rotating magnet system (3.2), which is arranged in a non-contact manner to a metal strip (1) running from the wind-out coiler (2.1) to the wind-on coiler (2.2), characterized by a counter-roller (4.1) as support bearing (4), corresponding to the rotating magnet system (3.2) and touching the metal strip (1).
12. The unit according to Claim 11, characterized by a counter-roller (4.1) of electrically and magnetically non-conductive material.
13. The unit according to Claim 11 or 12, characterized in that an air gap is continuously adjustable as distance (a) between rotating magnet system (3.2) and metal strip (1).
14. The unit according to any of Claims 11 to 13, characterized in that the rotating magnet system (3.2) is adjustable in its rotation speed.
15. The unit according to any of Claims 11 to 14, characterized in that the rotating magnet system (3.2, 4.3) is adjustable in its spatial position to the metal strip (1).
16. The unit according to any of Claims 11 to 15, characterized in that the rotating magnet system (3.2) is surrounded by a drum (3.2.1), the magnet system (3.2) being rotatable at a higher speed than that of the drum (3.2.1).
17. The unit according to Claim 16, characterized in that the rotating magnet system (3.2) is arranged eccentrically in the drum (3.2.1).
18. The unit according to Claim 17, characterized in that the rotating magnet system (3.2) is pivotably arranged about the central point of the respective drum (3.2.1).
19. The unit according to any of Claims 16 or 17, characterized in that the rotating magnet system (3.2) is arranged so as to be radially adjustable relative to the central point of the respective drum (3.2.1).
20. The unit according to any of Claims 17 to 19, characterized in that a distance is continuously adjustable as non-contact distance between rotating magnet system (3.2) and drum (3.2.1).
21. The unit according to any of Claims 11 to 20, characterized in that an edge (3.2.2) is provided on the rotating magnet system (3.2) to receive the tangential forces of permanent magnets (3.2.1).
22. The unit according to any of Claims 11 to 21, characterized in that a VA casing (3.3) is provided around the rotating magnet system (3.2) to receive the centrifugal forces of the permanent magnets (3.2.3).
23. The unit according to any of Claims 11 to 22, characterized in that a frequency converter, a control circuit (5) and a measurement of the strip tension/braking force and means (6) are provided for altering the air gap between rotating magnet system (3.2) and metal strip (1) as distance (a) by means of the counter-roller (4.1), which have

    a) a data line SPS (6.1),

    b) an input module (6.2),

    c) a control element with supply line (6.3) and display (6.4) for the indication of data,

    d) a first control (3.5) of the means (6) to alter the air gap between rotating magnet system (3.2) and metal strip (1) as distance (a) by means of the counter-roller (4.1),

    e) a second control (6.6) of a motor (3.4) of the rotating magnet system (3.2) and

    f) lines (6.7) for the measurement of the speed of the metal strip (1) and of the strip tension/braking force.

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