EP1404911A1

EP1404911A1 - Galette

Info

Publication number: EP1404911A1
Application number: EP02730279A
Authority: EP
Inventors: Heiner Kudrus
Original assignee: Barmag AG; Oerlikon Textile GmbH and Co KG; Barmag Barmer Maschinenfabrik AG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2001-05-25
Filing date: 2002-05-24
Publication date: 2004-04-07
Also published as: WO2002095104A1; JP2004526885A; JP4221227B2

Abstract

The invention relates to a galette for guiding at least one thread, comprising a hollow cylindrical body. Said hollow cylindrical galette body is positioned on a carrier by means of a plurality of bearings in such a way that it can rotate freely. At least one of the bearings is embodied as a radially acting magnet bearing having a plurality of bearing pole windings. A heating device is provided on the carrier, said heating device comprising at least one coil carrier having one coil. A closed magnetic flow can be produced between the galette body and the coil carrier with the coil, in order to induce heating of the galette body. According to the invention, the coil of the heating device and at least one of the bearing pole windings of the magnet bearing are formed on the carrier in such a way that the closed magnetic flow of the coil and a closed magnetic flow produced by the bearing pole winding at least partially overlap, in relation to the arrangement of bearings of the galette body. The galette body can thus be heated even in the region of the arrangement of bearings.

Description

Galette

The invention relates to a godet for guiding, heating and conveying a thread according to the preamble of claim 1.

A generic godet is known from EP 0 770 719 AI.

The known godet has a rotatably mounted godet casing, on the circumference of which one or more threads are guided. The godet casing is of hollow cylindrical design and is supported on a cantilevered support by means of several magnetic bearings. In the annular space formed between the carrier and the godet jacket, a heating device is arranged next to the magnetic bearings in order to heat the godet jacket. With this arrangement, a problem basically arises which significantly affects the function of the godet. The godet jacket is insufficiently heated in the area of the magnetic bearings, so that the thread or threads can only be guided in the central area of the godet jacket in order to carry out a thermal treatment on the thread or threads. As a result, very long cantilevered godets are required for the treatment of, for example, ten threads running in parallel, which are passed over the godet casing in several loops. However, the requirements for the storage of the godet jacket are becoming increasingly critical.

It is therefore an object of the invention to provide a godet of the type mentioned in the introduction, in which a uniform heating of the godet jacket is possible without significantly influencing the magnetic mounting of the godet jacket.

The object underlying the invention is achieved by a godet with the features of claim 1. Advantageous developments of the invention are defined in the subclaims.

The invention is characterized in particular in that the storage areas of the godet casing can be heated directly. The invention provides the possibility of arranging the coil carriers up to the ends of the godet casing. For this purpose, the coil of the heating device and at least one of the bearing pole windings of the magnetic bearing is formed on the carrier in such a way that the magnetic flux of the coil at least partially covers the bearing pole winding. In this way, at least two or more overlapping, overlapping or overlapping magnetic fluxes are generated within a normal plane of the godet casing. A first magnetic flux is generated by the coil carrier with the coil of the heating device and is referred to below as thermal magnetic flux. This magnetic flux causes an induction inside the godet jacket, which leads directly to the heating of the godet jacket. A second applied magnetic flux is generated by the bearing pole winding of the magnetic bearing and used to build up magnetic bearing forces to support the godet casing. Here, the two magnetic fluxes within the godet casing can act in the same direction, radially outwards or in the opposite direction, radially outwards and inwards. The advantageous superimposition of the magnetic fluxes, which can extend both in the axial direction and in the radial direction or in both directions, enables the setting of the smallest air gaps, so that low-loss heating of the godet jacket is also possible in one bearing plane.

In order to enable the heating and the storage of the godet casing in a very compact construction with a small installation space within the godet casing, the coil and the bearing pole winding are arranged axially next to one another in accordance with a preferred development of the invention. However, it is also possible to arrange the coil and the bearing pole winding one above the other. This embodiment of the invention is particularly advantageous in the opposite direction of action of the magnetic fluxes, for example to magnetically mount a shaft connected to the godet casing. In a particularly advantageous development of the invention, a receptacle is formed by the coil carrier in order to accommodate at least one or more bearing pole windings of the magnetic bearing. This makes it possible to generate the bearing magnetic flux within the thermal magnetic flux, so that there is no mutual interference between the magnetic fluxes.

In order to realize on the one hand a loss-free and undisturbed thermal magnetic flux up to the desired locations of the godet casing that are to be heated and on the other hand to enable the inclusion of one or more bearing pole windings, it is proposed according to an advantageous development of the invention to profile the coil carrier with two radially to to form upright legs just before the inside of the godet jacket. The coil and the bearing pole winding are arranged side by side between the legs.

The inclusion of the position pole winding of the magnetic bearing in the profiled coil carrier can now basically be carried out in two ways. In a first variant, which is formed by the advantageous development of the invention according to claim 5, the bearing pole winding and the coil are arranged axially next to one another within the coil carrier. For this purpose, the coil carrier is U-shaped with legs of the same length, which end immediately at a short distance in front of the godet jacket. The bearing magnetic flux generated by the bearing pole winding is guided directly in the godet jacket. The bearing magnetic flux of the bearing pole winding is enclosed by the thermal magnetic flux. The coil and the bearing pole winding are held in the slot base of the coil carrier.

In order to avoid any influence on the thermal magnetic flux and the bearing magnetic flux, according to the advantageous development according to claim 6, the sheet metal winding is assigned a sheet metal which is fastened to the inside of the godet jacket. The bearing pole winding and the lamination thus interact directly to guide the bearing magnetic flux. By Shielding means between the sheet metal and the godet casing could result in a further separation of the magnetic fluxes. Another advantage of the development according to claim 6 is that bearing losses, which occur, for example, from the magnetic reversal, are significantly reduced and thus lead to low braking torques within the magnetic bearing.

In a second basic variant for accommodating the bearing pole winding, the godet is designed in accordance with the development according to claim 7. For this purpose, the legs of the coil carrier are of unequal length, so that the coil inside the coil carrier and the bearing pole winding are arranged axially next to one another outside the coil carrier. In this development, the bearing pole winding acts inwards and thus opposite to the magnetic field generated by the coil. To guide the bearing magnetic flux, the bearing pole winding is juxtaposed with a hub connected to the godet casing, so that a bearing gap is formed between the hub and the layer pole winding.

In order to minimize the heat losses within the godet casing at the free end and thus to be able to use the entire length of the godet casing for thread covering, according to the advantageous development according to claim 8, the bobbin holder at the free end of the support has a radial to just before the inside of the Legs protruding from the godet and an axial leg that protrudes shortly before the inside of the end wall for guiding the thermal magnetic flux. This heats the edge area of the front wall.

Due to the particularly preferred development of the invention according to claim 9, losses in the current supply or magnetic leakage losses between the coil and the layer winding or the coil support and the layer winding are avoided. For this purpose, the layer winding has an insulation that is effective with respect to the coil carrier and / or the coil. The superimposition of the magnetic fluxes can be carried out independently of the direction of flow of the magnetic fluxes. In this way, the pole ends of the layer winding can be arranged axially opposite or radially opposite.

In cases where the. Coil carrier for receiving one or more coils is rotationally symmetrical and extends over the entire circumference of the carrier, the godet is preferably designed according to the features of claim 11. In this case, several layer windings are accommodated by the coil carrier, the layer windings being arranged at an angle to one another in a bearing plane. As a result, all of the layer windings of a magnetic bearing can advantageously be integrated in the coil carrier.

In order to enable the full use of the length of the godet jacket for thermal treatment of the thread, the godet jacket is supported by a magnetic bearing arranged at the free end of the carrier and a magnetic bearing arranged at the clamped end of the carrier. At each end of the carrier, coil carriers are provided with at least one coil, which additionally accommodate one or more layer-pole windings of the magnetic bearings. This enables heating of the godet casing down to the end regions without affecting the storage.

The layer-pole windings of the magnetic bearing formed at the free end of the carrier are preferably arranged radially inward with their pole ends, so that a bearing gap is formed between the pole ends of the layer-pole winding and the hub connected to the godet casing.

In contrast, the position-pole windings of the magnetic bearing formed at the clamped end of the carrier are preferably arranged radially outwards in such a way that a bearing gap is formed between the godet casing and the pole ends of the position-pole winding. This ensures a high storage stability of the godet casing. In a particularly advantageous development of the invention according to claim 15, a sensor for monitoring the position of the godet jacket and thus for monitoring the bearing gap is assigned to each layer winding. The bearing pole windings can thus be controlled individually or in groups by a control device.

To absorb the axial forces, the godet casing is supported by an additional axial bearing. The axial bearing is preferably designed as an axially acting magnetic bearing. However, it is also possible to form the axial bearing by means of roller bearings in an axial or radial design.

In order to ensure that the godet casing runs smoothly, at least one catch bearing is provided, which can be designed as a radial bearing that is not in contact with normal operation or as an elastically coupled radial bearing.

Some embodiments of the godet according to the invention are explained in more detail with reference to the accompanying drawings.

They represent:

Fig. 1 shows schematically a first embodiment of a godet according to the invention in longitudinal section; Fig. 2 shows a cross section through the godet of FIG. 1 along the line

A - A;

3 and 4 are schematic cutouts from the front end of a godet according to the invention in two further embodiments;

5 schematically shows a section of a further exemplary embodiment of a godet according to the invention; and 6 shows a cross section through the exemplary embodiment according to FIG. 5 along the line A - A.

A first exemplary embodiment of the godet according to the invention is shown schematically in FIGS. 1 and 2. FIG. 1 shows the parts of the godet essential for the invention on the basis of a section running parallel to and through the axis of rotation, and FIG. 2 shows schematically a sectional view perpendicular to the axis of rotation of the godet. The following description therefore applies to both figures, insofar as no express reference is made to one of the figures.

The exemplary embodiment of the godet according to the invention has a godet casing 1 which is connected in a rotationally fixed manner via an end wall 2 to a drive shaft 3 running inside the godet casing 1. For this purpose, a tensioning element 7 is provided at the end of the drive shaft 3 for fastening the godet casing 1. The drive shaft 3 is coupled at its opposite end to a drive (not shown here). For example, an electric motor could be provided as the drive.

The godet casing 1 is supported on a cantilever support 4 by two radially acting magnetic bearings 6.1 and 6.2. The carrier 4 has a cylindrical shape and extends within the godet casing 1 to just in front of the end wall 2. The hollow cylindrical carrier 4 is penetrated by the drive shaft 3. On the side opposite the end wall 2, the carrier 4 is fastened to a machine frame (not shown here) via a collar 5.

A heating device 8 is arranged in the annular space formed between the godet casing 1 and the carrier 4. The heating device 8 has a plurality of coil carriers 9.1 to 9.4, which are fastened to the carrier in the circumferential direction and in the longitudinal direction. The coil carriers 9.1 to 9.4 each hold a coil 10. For this purpose, in a plurality of coil carriers 9 arranged one behind the other around the circumference of the carrier 4 or on a rotationally symmetrical coil carrier. ger 9 inserted the turns of a coil 10. The coils 10 are connected to a power supply unit 26.

To accommodate the magnetic bearings 6.1 and 6.2, the coil carriers 9.1 and 9.4 are each formed with a receptacle 16 at the free end of the carrier 4 and at the clamped end of the carrier 4, in which receptacle 16 the layer windings 11 of the magnetic bearings 6 are embedded. For this purpose, the coil carrier 9.1 arranged at the free end of the carrier 4 is U-shaped. The coil support 9.1 is fastened to the support 4 with the profile base. The legs 14 of the coil carrier 9.1 protrude radially and end at a short distance in front of the inside of the godet casing 1. The coil carrier 9.1 can in this case be segmented, so that the coil carrier 9.1 extends over a small angular range from the circumference of the carrier 4. However, it is also possible for the coil carrier 9.1 to be rotationally symmetrical and to extend over the entire circumference of the carrier 4. Between the legs 14.1 and 14.2 of the coil carrier 9.1, a coil 10.1 and the layer winding 11.1 are arranged side by side within the coil carrier 9.1. The Lageφolwicklungen 11 of the magnetic bearing 6 each consist of a pole element on which one or more excitation windings are held. The Lageφolwickung 11.1 protrudes with the pole ends 12 parallel to the legs 14.1 and 14.2 until just before the inside of the godet casing 1. Between the pole ends 12 and the inside of the godet casing 1, a bearing gap 17 is formed. In the area of the pole ends 12, sheet metal 13 is embedded in the godet casing 1, which faces the pole ends 12 of the layer winding 11.1.

The magnetic bearing 6.1 has several Lageφolwicklungen 11.1 to 11.4, which are arranged at 90 ° to each other at an angle to each other in a bearing plane and are each held in a coil carrier 9.1. In Fig. 1, the Lageφolwicklungen 11.1 and 11.3 are shown, which are opposite each other on the carrier 4. In Fig. 2, the arrangement of all four Lageφolwicklungen 11.1 to 11.4 of the magnetic bearing 6.1 is shown. The magnetic bearing 6.2 arranged at the opposite clamped end of the carrier 4 is constructed identically to the magnetic bearing 6.1. In this regard, reference is made to the preceding description. The Lageφolwicklungen 11.1 to 11.4 of the magnetic bearing 6.2 are arranged in the coil carrier 9.4 next to a coil 10.4. Two further coil carriers 9.2 and 9.3 are arranged on the circumference of the carrier 4 between the coil carriers 9.1 and 9.4 at the respective ends of the carrier 4. A coil 10.2 and 10.3 is wound in each of the coil carriers 9.2 and 9.3. The coil carriers 9.1, 9.2, 9.3 and 9.4 can each be formed from a plurality of individual segments which are arranged one behind the other on the carrier in the circumferential direction. However, it is also possible that the coil carriers 9.1, 9.2, 9.3 and 9.4 are each made from one component and are arranged as a ring on the carrier 4.

Several sensors 19.1 to 19.4 are assigned to each magnetic bearing 6.1 and 6.2. The sensors 19 are designed as distance sensors in order to detect the position of the godet casing 1. For this purpose, the free ends of the sensors 19 are arranged at a short distance from the inside of the godet casing. The sensors 19.1 to 19.4 of the magnetic bearings 6.1 and 6.2 are coupled to a control device 18 by signal lines. The control unit 18 is connected via the power supply unit 26 to the position winding 11.1 to 11.4 of the magnetic bearings 6.1 and 6.2.

1 shows that the diameter of the collar 5 of the carrier 4 is larger than the diameter of the godet casing 1. The collar 5 of the carrier 4 has an annular groove 21 towards the godet casing 1, which has an axial bearing 23 receives. The axial bearing 23 is designed as an axially acting magnetic bearing, which forms an axial bearing gap 25 with the end face 22 of the godet casing 1.

Inside the carrier 4, two spaced apart emergency bearings 24.1 and 24.2 are formed between the drive shaft 3 and the carrier 4. Safe starting or emergency running of the godet casing 1 is thus independent of guaranteed by the magnetic bearings. For example, plain bearings or roller bearings can be used as emergency bearings.

The embodiment of the galette according to the invention shown in FIGS. 1 and 2 is used for conveying, thermal treatment and drawing of threads. In this case, the coils 10 of the heating device 8 are energized via the energy supply unit 26, so that a magnetic flux, which is referred to here as thermal magnetic flux, is introduced into the godet casing 1 via the respective coil carriers 9.1 to 9.4. A closed magnetic flux between the legs 14, the coil support 9 and the godet casing 1 is thus guided to each coil support. The magnetic flux induces an eddy current in the rotating godet jacket, which leads to heating of the godet jacket. By using several coils in the axial direction one behind the other, several heating zones are formed, each of which is assigned a temperature sensor (not shown here) for temperature control. The surface of the godet casing 1 is thus heated uniformly over the entire length of the covering.

A further magnetic flux for generating magnetic bearing forces is built up within the coil carriers 9.1 and 9.4 by the position pole windings 11.1 to 11.4 of the magnetic bearings 6.1 and 6.2. For this purpose, the excitation windings of the layer-type windings 11.1 to 11.4 are energized via the energy supply unit 26. A further magnetic flux, which is referred to here as bearing magnetic flux, is thus conducted over the pole ends 12 and the respectively associated laminations 13.1 and 13.2 in the godet casing 1. The bearing magnetic flux for generating magnetic bearing forces is formed within the thermal magnetic flux.

In operation, the current position of the godet casing 1 is measured by the sensors 19 in the area of the bearing planes of the magnetic bearings 6.1 and 6.2, and the measured values are sent to the control unit 18. The position of the godet casing in the respective storage levels is determined from the measured values in the control unit and the individual NEN excitation windings of Lageφolwicklungen 11.1 to 11.4 of the magnetic bearings 6.1 and 6.2 controlled. Thus, a substantially constant bearing gap 17 is established between the lamination 13 and the pole ends 12 of the position winding 11.

In order to avoid undesired heating of the sheet metal 13 within the godet casing 1, it is possible to provide insulation between the sheet metal and the godet casing. The insulation could be made of a non-metal or a plastic, for example.

There is also the possibility of applying an insulating layer between the layer winding 11.1 to 11.4 and the coil 10.1 or 10.4 and the coil carrier 9.1 and 9.4. This could achieve a magnetic and an electrical separation between the windings of the heating device and the windings of the magnetic bearings.

Another embodiment of a godet according to the invention is shown in FIG. 3 in a partial section. The exemplary embodiment according to FIG. 3 is essentially identical to the exemplary embodiment in FIGS. 1 and 2. In this respect, only the essential differences of the exemplary embodiment are shown below.

The godet casing 1 is rotatably supported on the carrier 4 by the magnetic bearings 6.1 and 6.2. The magnetic bearing 6.2 at the clamped end of the carrier 4 is identical to the previous exemplary embodiment. In this case, the position winding windings 11.1 to 11.4 are accommodated within the U-shaped coil carrier 9.4.

The magnetic bearing 6.1 at the free end of the carrier 4 is formed with Lageφolwicklungen 11 which protrude radially inward with their pole ends 12, wherein a bearing gap 28 is formed between the pole ends 12 and a hub 27. The hub 27 is firmly connected to the end wall 2 of the godet casing 1 and projects into the interior of the godet casing 1 into it. The hub 27 is penetrated by the drive shaft 3 and firmly connected to the drive shaft 3 via a clamping element 7.

The Lageφolwicklungen 11.1 and 11.2 to 11.4 (which are not shown here) are fixed in a receptacle 16 of the coil carrier 9.1. The coil carrier 9.1 is profiled in such a way that on the one hand an outwardly open U-shaped receptacle for the coil 10.1 is formed and on the other hand an annular receptacle on the inside of the coil carrier 9.1. The coil carrier 9.1 thus has a long leg 14.1 which delimits the coil holder and a short leg 14.2 which delimits the holder 16 of the layer winding 11.1. The groove base of the coil carrier 9.1 thus has a step change, so that the coil 10.1 comes to rest on the outside of the coil carrier 9.1 next to the layer winding 11.1 arranged on the inside of the coil carrier 9.1.

In operation, the coil 10.1 and the coil carrier 9.1 generate a thermal magnetic flux which is guided to the godet jacket 1 via the legs 14.1 and 14.2. The godet jacket 1 is heated up to just before the end wall 2 by the induced current.

For storage, a bearing magnetic flux is generated between the respective pole ends 12 and the hub 27 by the position ole windings 11.1 and the other position ole windings of the magnetic bearing 6.1, which are evenly distributed on the circumference of the coil carrier. Thus, the thermal magnetic flux acts outwards to the godet jacket 1 and the bearing magnetic flux for mounting the godet jacket 1 inwards to the hub 27. This shows a possibility of avoiding a mutual influence of the magnetic fields.

A further exemplary embodiment of an integration of the layer winding 11 of a magnetic bearing with a coil carrier 9 of the heating device 8 is shown in FIG. 4. Here, a profiled coil carrier 9.1 is attached to the circumference of the carrier 4 at the free end of the carrier 4. The coil carrier 9.1 has at the free end opposite the end wall 2 a long leg 14.1 and axially Distance a second short arm 14.2. The groove base of the coil carrier 9.1 is provided with a diameter step between the legs 14.1 and 14.2, so that a receptacle for the coil 10 is formed and, on the other hand, a receptacle for a layer winding 11 of the magnetic bearing 6. Between the receptacle 16 of the coil carrier 9 and the Lageφolwick 11 a free leg of the carrier 4 is arranged. A further separation and insulation between the windings of the heating device and the winding of the magnetic bearing is thus achieved. The Lageφolwick 11 forms with the hub 27 a bearing gap 28, as described in the previous embodiment of FIG. 3.

The magnetic bearing 6.2 at the clamped end of the carrier 4 is constructed identically to the previous exemplary embodiments. In the area between the coil carriers 9.1 and 9.4, further coil carrier segments (not shown here) are provided which have a plurality of coils wound in the axial direction. These are distributed unevenly or evenly around the circumference of the carrier, so that inductive heating of the godet casing 1 is possible.

Due to the special design of the magnetic bearings 6.1 and 6.2 in the exemplary embodiments of FIGS. 3 and 4, a particularly stable mounting of the godet casing is achieved. The internal bearing gap between the bearing pole windings and the hub 27 allows the position of the godet casing to be detected in an area that is not immediately heated. In this way, in particular simple distance sensors can be used which have a lower temperature resistance.

However, the training is also suitable for mounting the drive shaft 3 directly in magnetic bearings. In this case, a bearing gap would be formed between the pole ends of the layer winding 11 and the drive shaft 3.

Another exemplary embodiment of an integration of the position winding 11 of a magnetic bearing with a coil support 9 of the heating device 8 is shown in FIGS. 5 and 6. 5 shows a section of a longitudinal section of the godet and FIG. 6 shows a section of a cross section of the godet. Here, a profiled coil support 9 is attached to the circumference of the support 4 at the free end of the support 4. The coil carrier 9 has at the free end opposite to the end wall 2 one end of a leg 14.1 and at an axial distance a second leg 14.2. The groove base of the coil carrier 9 is provided with a diameter step between the end of the leg 14.1 and the leg 14.2, so that a receptacle for the coil 10 is formed and, on the other hand, a receptacle 16 for a layer winding 11 of the magnetic bearing 6. The layer winding 11 has two pole ends 12, which face each other in the radial direction. This creates a bearing magnetic flux with a direction of flow in the circumferential direction, which is thus orthogonal to the thermal magnetic flux. The pole ends 12 of the bearing pole winding 11 form with the hub 27 a bearing gap 28, as described in the previous embodiment according to FIG. 3. Due to the design of the coil carrier 9 - as shown in Fig. 5 - the thermal magnetic flux is guided in the axial direction between the legs 14.1 and 14.2. The edge area of the end wall 2 is included directly on the godet casing 1, so that the edge area of the end wall 2 is heated. The godet jacket 1 is evenly heated to the end, so that the entire length of the godet jacket 1 is available for thread covering.

The invention is not limited to the exemplary embodiments of the godet according to the invention shown in FIGS. 1 to 6. Basically, the carrier 4 could be designed as an axis, on the circumference of which incisions for receiving the layer elements or the coil carrier are included. A rotatable godet casing could be guided on the circumference of the axis. The design of the magnetic bearing 6 could be taken over unchanged. What is essential here is the interleaving and integration of the layer-type windings with the windings of the heating device in such a way that the coil carriers of the heating device receive the position-type windings in addition to the heating coils. In this case, only isolated layer windings can be integrated in the coil carrier. When using magnetic bearings, the position of which pole windings are distributed in several bearing windings, it is quite possible that individual bearing pole windings are not arranged in a coil carrier. In particular in those cases in which the coil carriers are not rotationally symmetrical and are therefore attached to the carrier in the circumferential direction only one after another in segments.

It is also possible to magnetically support a shaft connected to the godet casing. The Lageφolwicklungen would be arranged radially below the heating coils in this case to ensure heating of the godet within the storage level.

LIST OF REFERENCE NUMBERS

Galette jacket end wall drive shaft support collar magnetic bearing tensioning element heating device coil support coil layer winding winding poling sheet metal leg insulating layer recording bearing gap control device sensor thread groove end face axial bearing emergency bearing bearing gap energy supply unit hub bearing gap

Claims

claims

1. godet for guiding, heating and conveying a thread with a drivable, hollow-cylindrical godet casing (1), on the circumference of which the thread can be guided, with a cantilevered support (4) on which the godet casing (1) by at least one radially acting magnetic bearing (6) is rotatably mounted with several Lageφolwicklungen (11), and with a heating device (8) which has at least one coil carrier (9) with a coil (10) on the carrier (4), wherein between the godet jacket (1) and Coil carrier (9) with the coil (10) a closed magnetic flux (magnetic flux) for the purpose of induced heating of the godet jacket (1) can be generated, characterized in that the coil (10) of the heating device (8) and at least one of the bearing pole windings (11) of the magnetic bearing (6) are attached to the carrier (4) in such a way that the thermal magnetic flux at least partially covers the layer winding (11).

2. godet according to claim 1, characterized in that the coil (10) and the Lageφolwick (11) on the carrier (4) in the axial direction are arranged side by side or one above the other.

3. godet according to claim 1 or 2, characterized in that the coil support (9) forms a receptacle (16) for at least one of the layer-ge winding (11), so that the bearing magnetic flux through the layer-winding (11) can be generated within the thermal magnetic flux ,

4. godet according to claim 3, characterized in that the coil carrier (9) profiled with two radially up to just before the inside of the godet jacket (1) upstanding legs (14.1, 14.2) is formed for guiding the thermal magnetic flux and that

Coil (10) and the layer winding (11) are arranged side by side between the legs (14.1, 14.2).

5. godet according to claim 4, characterized in that the legs (14.1, 14.2) of the U-shaped coil support (9) are of equal length, that the coil (10) and the layer winding winding (11) within the coil support (9) are arranged side by side and that the Lageφolwick (11) and the godet jacket (1) cooperate to guide the bearing magnetic flux.

6. godet according to claim 5, characterized in that the position φol winding (11) is associated with a sheet metal (13), which sheet metal (13) is fastened to the inside of the godet casing (1) and with the layer φol winding (11) for guiding the bearing magnetic flux - it works together.

7. godet according to claim 4, characterized in that the legs (14.1, 14.2) of the bobbin (9) are of unequal length, that the coil (10) inside the bobbin (9) and the layer winding winding (11) outside the bobbin ( 9) are arranged next to one another and that the layer winding (11) and a hub (27) connected to the godet casing (1) interact to guide the bearing magnetic flux.

8. godet according to one of claims 4 to 7, characterized in that the coil carrier (9) at the free end of the carrier (4) has a radial up to shortly before the inside of the godet casing (1) legs (14.2) and an axial to short has legs (14.1) projecting in front of the inside of the end wall (2) for guiding the thermal magnetic flux.

9. godet according to any one of claims 4 to 8, characterized in that the layer winding winding (11) with respect to the coil carrier (9) and / or the coil has insulation (15).

10. godet according to one of the preceding claims, characterized in that the layer winding winding (11) has two pole ends (12) which are formed at a distance from one another, which pole ends (12) lie opposite one another in the axial direction or in the radial direction.

11. godet according to any one of the preceding claims, characterized in that several Lageφolwicklungen (11.1-11.4) can be received by the coil carrier (9.1) and that the Lageφolwicklungen (11.1-11.4) are arranged angularly offset from one another in a bearing plane.

12. godet according to one of the preceding claims, characterized in that the godet casing (1) is mounted by two radially acting magnetic bearings (6.1, 6.2), one of the magnetic bearings (6.1) at the free end of the carrier (4) and the other magnetic bearing (6.2) are arranged at the clamped end of the carrier (4), and that in each case one or more layer windings (11) of the magnetic bearing (6) through the coil carriers attached to the ends of the carrier (4) (9) are included.

13. A godet according to claim 12, characterized in that the position winding windings (11) of the magnetic bearing (6.1) formed at the free end of the carrier (4) are arranged radially inward with the pole ends (12), so that between the pole ends ( 12) the layer winding (11) and the hub (27) connected to the godet casing (1) form a bearing gap (28).

14. A godet according to one of claims 12 or 13, characterized in that the position ole windings (11) of the magnetic bearing (6.2) formed at the clamped end of the carrier (4) are arranged radially outward with the pole ends (12), so that between the bearing ends (12) of the layer winding (11) and the godet casing (1) form a bearing gap (17).

15. godet according to any one of claims 12 to 14, characterized in that each of the Lageφolwicklungen (10) is assigned to one of the sensors (19) and that the Lageφolwicklungen (10) are each individually controllable by the control device (18).

16. godet according to one of claims 1 to 15, characterized in that the godet casing (1) is mounted by an additional axial bearing (23) and that the axial bearing (23) is formed by an axially acting magnetic bearing.

7. godet according to one of claims 1 to 16, characterized in that at least one catch bearing is provided, which is designed as a non-contact radial bearing (24) or as an elastically clamped .radial bearing.