FI122849B - Roll operation, roll and method - Google Patents

Description

SCREEN USE, ROLL AND METHOD FIELD OF THE INVENTION

The invention relates to rolls of a fiber web machine such as paper, board, tissue or pulp and their use. In particular, but not exclusively, the invention relates to rotary drives for rolls of a fiber web machine and corresponding track-like fibrous web processing members.

BACKGROUND OF THE INVENTION

The rotatable machine members of a fibrous web machine for treating a fibrous web are, for example, rollers and rotary members for rotating fabrics and belts.

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The roller is usually supported at both ends by rotating its shafts through bearings into a non-rotatable body structure. Typically, bearings mounted on shafts are secured to bearing housings which are secured to the frame structure.

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It is known to use a permanent magnet motor with a tubular shaft as a drive motor for a paper machine roll. A motor with a tubular shaft is mounted at the end of the roll shaft or between the bearing and the roll frame so that the shaft carries the entire weight of the motor. The motor rotor and stator are mounted on each other

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o 25 to control air gap between rotor and stator and to prevent rotation of stator part with ιό torque support.

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x The drive motor as a whole has been found to start to vibrate strongly

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during operation if the shaft end or shaft has radial throw. When replacing ^ 30 drive motors, an extension can be made to the existing roll shaft to which o the motor is mounted. In this case, the joint between the roll axis and the joint always causes an eccentricity according to the manufacturing tolerance of C 1, which causes vibrations during the use of the roll. A stator mounted on the frame of the motor, mounted on a radially thrusting and / or eccentric shaft end or 2 extension, tends to vibrate during use. The oscillation may be transmitted directly by the roll to the process of manufacturing the fibrous web and the vibration may be transmitted by the roller bearing and the apparatus body via other rolls to the process of manufacturing the fibrous web 5. Vibrations interfere with the fiber web manufacturing process and cause mechanical damage to bearings, rollers, and other components of the fiber web manufacturing equipment, such as frame structures.

DE29908433U1 discloses a roller in which a drive motor 10 with a roller tube shaft is mounted on a roller shaft between the roller bearing and the roller body. The drive motor body is equipped with a torque support.

SUMMARY

According to a first aspect of the invention there is provided a roll drive for rotating a roll casing through an axis rotatably supported by a bearing mounted in a bearing housing on a hardware body, the roll drive comprising a stator body and a stator mounted on a stator body comprising used to surround the stator windings so that an air gap is formed between the rotor and the stator. The rotor is magnetically magnetized to allow a large air gap; the rotor being adapted to be attached to the shaft such that the shaft carries the mass of the rotor; and the stator body is adapted to be secured to the outside of the bearing housing such that the mass support of the stator and the stator body 25 25 is arranged in a manner independent of the rotor support.

In some embodiments, the permanent magnet magnetization of the rotor x is accomplished by attaching one or more permanent magnets to the axis Q_ of the rotatable roll, preferably directly to the axis.

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05 g According to some embodiments, the rotor comprises a roller for attachment to a shaft

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a shaft splice to which is mounted, preferably directly to the shaft splice, permanent magnets for permanent magnet excitation of the rotor. According to some embodiments, the shaft extension is mounted directly on the shaft without a shaft coupling.

According to some embodiments, the stator body is arranged behind the bearing viewed from the direction of the sheath 5.

According to some embodiments, the stator body is attached to the bearing housing. According to some embodiments, the stator body is attached to the hardware body.

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According to some embodiments, one or more permanent magnets are disposed on the shaft behind the bearing housing viewed from the direction of the shell.

According to some embodiments, one or more permanent magnets are mounted on 15 shaft extensions behind the bearing housing viewed from the direction of the housing.

According to some embodiments, the roll drive is mounted on the outside of the stator body by roller bearings.

According to some embodiments, the stator body comprises at least one lead-through for the rotor.

According to some embodiments, the stator body comprises a seal between the rotor and the lead-through to limit the entry of foreign matter into the roll drive.

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ιό According to some embodiments, the roll drive comprises liquid and / or air cooling, preferably compressed air cooling.

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According to another aspect of the invention there is provided a roll of a fibrous web machine comprising a jacket for handling a fibrous web and an axis fixed to the jacket rotatably supported by a bearing mounted in a bearing housing, the roll comprising:

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a roll drive according to any embodiment of the invention.

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According to a third aspect of the invention there is provided a method of mounting a roll drive on a roll of a fiber web machine arranged to rotate the roll casing through an axis rotatably supported by a bearing mounted in a bearing housing to a housing frame a rotatable rotor acting on the shaft, and in the method the rotor is arranged surrounded by stator windings such that an air gap is formed between the rotor and the stator. The rotor is magnetically magnetized to allow a large air gap, and in the method, the rotor is attached to the shaft such that the shaft carries the rotor mass, and the stator body is mounted outside the bearing housing such that the mass of the stator and stator body is supported.

The stator can be arranged at a fixed distance from the roll bearing, as can the 15 rotors. The stator part may be attached to the bearing housing. With the roller bearings typically being fixed in the bearing housing, a fixed distance of the stator is achieved by securing the stator member to the bearing housing. The stator is attached to the stator body of the engine, which can at the same time form a sufficiently tight housing for the operation of the engine. The motor stator frame, or shorter frame, may be mounted on 20 bearing housings. The stator member may be attached to the same frame structure as the roll bearing housing. The motor body may be mounted on the same body structure as the roll bearing housing.

The invention makes it possible to provide direct drive for the roll by attaching the rotor part of the motor 25 to the roll shaft behind the roll bearing housing (i.e., from the roll casing to the other side of the bearing housing) and i σ> to the roll bearing housing or other fixed part position relative to the bearing on the shaft. Direct use of the roller can be achieved

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without bearing between rotor and stator in engine. The motor can be run without bearing. The direct drive of the roll can be achieved by means of a rotor which is: o mounted directly on the roll axis and / or C \ | mounted on the axle joint. The motor rotor thus drives the roller shaft bearings.

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The rotor mounted on the roll shaft may be allowed to rotate with the eccentricity that is formed on the rotor when mounted on the shaft end or formed on the rotor mounted on the shaft end when rotating the roll on its supported bearings. The rotor can be made directly on the shaft or the rotor can be made directly on the shaft extension.

The air gap of the motor consists of a fixed distance between the stator located on the roller bearing and the rotor mounted on the shaft, which rotor is mounted and mounted on the roller bearing. The motor also allows for air gap variation as the roll 10 deflects and the rotor moves relative to the stator as the roll deflection varies under different roll loading conditions.

The motor is provided with a large air gap between the stator and the rotor, which allows the rotor to move with great eccentricity with respect to the stator. The large drive air gap design of the roller drive, in which the rotor uses roller shaft bearing and the stator and rotor are not bearing relative to each other in the motor, permits relatively large radial deflections of the rotor without vibration problems when operating the motor. The oscillation due to radial throw is mainly limited to the rotor. The mass supported on the rotor shaft is much less than that of a complete motor (e.g., a tubular shaft) supported on the shaft 20, in which the rotor and stator are bearing to one another.

Particularly advantageous embodiments may be implemented, for example, when renewing a roll drive or adding a roll drive to a roll. The motor parts can be attached to the roll

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0 25 for example retrospectively with mechanical joints, e.g. according to some embodiments g, by means of a shaft splice to be connected to the roll shaft. For these σ> joints, normal fabrication tolerances can be allowed without vibration problems.

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The stator member and the roll drive housing respectively can be disassembled without having to remove the ^ 30 roll bearing housing or bearing. The roll may thus be supported on its bearings o during the removal of the stator member. According to some embodiments

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the rotor part can be detached with the roll end supported on the bearing housing and the bearing.

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Compared to the known roll drive installation and motor construction, the roll drives according to embodiments of the invention can be reduced to motor parts and roll to motor mounting parts. Bearings, bearing gaskets and bearing lubrication systems may be excluded from engine parts. Engine mounting parts can be implemented more simply and with lower tolerance requirements. Preferably, the delivery of the motor comprises a housing comprising a stator attached thereto, and the delivery comprises a separate rotor portion comprising permanent magnets. If necessary to protect the inside of the electric motor 10, for example, harmful particles, water splashes and / or liquids suitable seals which can be attached to the body, for example, the rotor bushing supporting the shaft / axis of the extension may be used.

The roll drive may be arranged to drive, preferably direct drive, a drying cylinder, a guide roll, a vacuum roll, a coating station roll, a press roll or a calender roll.

Embodiments of the invention provide low-cost, mechanically-reliable roller drives with no abrasive and wear parts.

Various embodiments of the present invention will be described or described only in connection with some or some aspects of the invention. One skilled in the art will appreciate that any embodiment of any aspect of the invention may be applicable

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25 in the same aspect of the invention and in other aspects alone or in combination with other embodiments.

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x BRIEF PRESENTATION OF THE PATTERNS

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The invention will now be described by way of example with reference to the accompanying drawings. Figures 1-3 show some preferred roller drives for a fiber web machine.

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DETAILED EXPLANATION

In the following description, like reference numerals refer to like parts. It should be noted that the figures shown are not in their entirety on a 5 scale, and that they serve primarily the purpose of illustrating embodiments of the invention.

Figures 1-3 schematically show rolls 1 according to some preferred embodiments and roll drives 10 for roll 1 of a fiber web machine. The roller 1 comprises 10 jacket members 2 and a shaft 3 fixed to the jacket member by means of, for example, an end flange, rotatably supported by a bearing 4 in a bearing housing 5. The bearing housing 5 comprises lubricant seals 6 arranged on both sides of the bearing 4 between bearing 3 not shown in the figure) the lubricant does not escape through the shaft 3 passages in the bearing housing 5 15. The bearing housing 5 is firmly supported on the hardware body F.

In Figs. 1 to 3, the roll drive 10 comprises a rotor member 11 and a stator member 12, between which an air gap 13 is formed to operate the motor when the rotor member 11 20 is rotatably supported inside the stator member 12.

According to some embodiments (e.g., Figs. 1 and 2), the roller 1 may be assembled by mounting the bearing housing 5 with bearings 4 on the shaft 3, mounting or fabricating rotor member permanent magnets 11 'on the first shaft extension 20, o 25 securing the first shaft extension 20 When viewed from 2 directions, and installing g) around the rotor portion 11, the stator portion 12 can be mounted in place of x, for example, by attaching the stator body 14 Q_ comprised of the roll drive 10 around the rotor 11. Of course, such an alternative is also feasible for the bearing housing 5 and the bearing 4 to be mounted over the fixed rotor member 11 if the dimensions of the bearing 4 permit it to be threaded over the rotor 11 to the C 3 axis 3 according to an advantageous embodiment. The rotor around the permanent magnets 8 is smaller than the inside diameter of the roller shaft bearing 4.

In Fig. 1, the roll drive 10 comprises a stator body 14 which is rotatably secured to the bearing housing 5 from the first attachment point 15. The body 14 5 may comprise a flange for securing to the side of the bearing housing 5, for example dust and splashproof. The body 14 is supported in place with respect to the bearing 4. The stator part 12 is attached to the body 14 and is thus supported in place with respect to the bearing 4.

In Figure 1, the rotor member 11 comprises a non-perforated first shaft joint 20 inside the rotor permanent magnets 11 'which is rotatably secured to the shaft 3 at junction 25. The shaft junction 25 may be accomplished by conventional screwing or 15 in combination with some conventional joining techniques. The shaft coupling 25 may be implemented in Figure 1 in the same manner as shown in section in Figure 2.

In Figure 1, the materials forming the first shaft splice 20 and the shaft 3 are shown as closed, but the shaft splice and / or shaft may also comprise a through hole.

The shaft-perforating hole may be used, for example, to convey heat transfer medium into and / or out of roll 1 to provide a roll to be cooled and / or heated and / or to transport pressure medium in / out and / or to provide a blow or vacuum roll. The permanent magnets 11 'may be made directly on the first shaft extension 20.

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In Figure 1, the rotor member 11 is rotatably supported relative to the stator member 12 through the first shaft extension 20 and the shaft 3 and the shaft bearing 4, and neither the rotor and the stator x are mounted to each other nor to the body 14. No bearing of the rotor member 11

In Fig. 2, the roll drive 10 comprises a stator body 14 fixedly fixed 0X1 to the hardware body F at the second attachment point 15 '. The mounting of the body 14 can be effected adjacent to the bearing housing 5, preferably on the same hardware body F as the bearing housing 5 of the roller 1. The body 14 may comprise a stand by means of which the aforementioned mounting can be carried out. The body 14 is fixedly fixed relative to the bearing 4. The stator part 12 is fixed to the body 14 and is supported in place relative to the bearing 4.

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In Figure 2, the rotor member 11 comprises a hollow second shaft splice 21 inside the rotor 11 'having a hole, i.e. a hollow, fixed to the shaft 3 of the roll 1 at junction 25. The shaft coupling 25 may be implemented as described above by conventional shaft coupling techniques. In Fig. 10 2, the materials forming the second shaft splice 21 and shaft 3 are shown with a through hole, but the shaft splice and / or shaft can also be solid. The permanent magnets 11 'may be made directly on the second shaft extension 21.

At the junction 25 of Figure 2, it is shown that the second shaft extension 21 may comprise an adapter portion at the junction end 15 to be mounted to the shaft 3, preferably having an external cylindrical or conical surface for centering the shaft extension into the inner hole 3 '. Preferably, the second shaft extension 21 may comprise a connecting flange at the joint end to be attached to the shaft 3, for example to provide a screw connection through the connecting flange to the end of the shaft 3.

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In Fig. 2, the rotor member 11 is rotatably supported relative to the stator member 12 via a second shaft splitter 21 with a hole 21 'and a shaft 3 with a hole 3' and a shaft bearing 4. The rotor 11 and the stator 12 are not mounted to each other or to the body 14. There is no need for bearing the rotor part 11 inside the body 14.

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Since the motor body 14 is spaced apart from the bearing housing 5, the shaft 3 i σ> is exposed at the backside of the bearing housing 5 as viewed from the direction x of the housing portion 2 of the roll 1. Preferably, a first is provided between the body 14 and the shaft 3

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a protective gasket 16 to prevent impurities from entering the engine 10. Since the engine 30 has no bearings and thus no lubricants, the first protective gasket 16 comprises a sealing structure protecting the engine from the outside to the inside.

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According to some embodiments, the body 14 of the roll drive 10 comprises an opening 17, 10 which may be provided with a door. The aperture 17 may be used, for example, for maintenance and inspection, or may be provided through an axis 3 or a first shaft extension 20 or a second shaft extension 21.

In Figure 3, the roll drive 10 comprises a body 14 and a stator member 12 mounted to the body, fixed in a non-rotatable and dust and splash-proof manner to the bearing housing 5 from the first attachment point 15. The body 14 is provided on two sides for a continuous shaft 23. The long continuous shaft 23 extends through the bearing housing 5 and there are lubricant seals 6 between the shaft 23 and the bearing housing 5. The lead-through or inner lead-through on the bearing housing 5 of the body 14 can receive the long shaft 23 through the stator 12 without additional sealing. The through passage outside the body 14 comprises an opening 17 provided with a second protective seal 18 to prevent foreign material such as dust and splashes from entering the roll drive 10. Since the motor has no bearings and thus no lubricants, the second protective seal 18 comprises a sealing structure protecting the motor from the outside to the inside.

In Figure 3, the permanent magnets 20 'attached to the long shaft 23 outside the bearing housing 5 form the rotor part 11 of the roll drive 10 when the roll drive 10 is operational. The permanent magnets 11 'may be made directly on a continuous axis 23.

According to some embodiments, the roller 1 may be assembled by mounting the bearing housing 5 25 with its bearings on the shaft 4, mounting the rotor parts 11 'on the long shaft 23 outside the bearing housing 5 and securing the stator part 12 to the bearing housing 5.

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According to some embodiments, the roller 1 can be assembled by forming the rotor part 11 of the long shaft 23 and the permanent magnets 11 'to be attached to the shaft 23 by mounting the bearing housing 5 with its bearings 4 on the shaft 23

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over the rotor portion 11 and securing the body 14 comprising the stator portion 12 to the bearing housing 5.

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The application of Fig. 3 may be useful, for example, for manufacturing new rolls 1 or rebuilding rolls if a long shaft 23 is provided in roll 1. For example, an existing shaft 1 can be removed from existing roll 1 and replaced with a new shaft 23 formed as a rotor. A long continuous shaft 23 comprising permanent magnets 11 'facilitates a small radial throw as a rotor 11 than a rotor realized by a shaft extension 20,21.

In Figure 3, the long shaft 23 is provided with an internal through hole 23 '. The long uniform shaft 23 may also be solid, and the long shaft 23 may terminate inside the body 14, whereby the body 14 may comprise a lid 17 or the body 14 may be formed without an opening 17.

In Fig. 3, the rotor 11 and the stator 12 are not mounted to each other in the motor and not to the body 14. No bearing of the rotor part 11 is required inside the body 14.

In the embodiments of the roll drive 10 shown in Figs. 1-3, power transmission switches are not used to reduce the radial output of the rotor and / or to reduce the eccentricity of the rotational movement of the rotor.

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In the embodiments of the roll drive 10 shown in Figs. 1-3, the alternating magnetic flux generated by the windings of the stator 12 can exert forces across the air gap 13 between the windings of the stator 12 and the permanent magnets 11 'to accelerate, rotate and slow 11 coupled rolls 1 via roll shaft 3, 23, g Thanks to the permanent magnet 11 'rotor 11, there is no need to induce a current over the air gap 13 σ> to form the magnetic field of the rotor. Thus, when using a permanent magnet x rotor 11, the air gap 13 between the rotor and the stator can be up to 5 mm even in commercial implementations. According to one embodiment, the air gap is 2 to 5 mm, preferably about 3 mm. Thus, radial emissions to the rotor due to normal to manufacturing and assembly techniques do not prevent

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normal operation. Such an air gap can be considered surprisingly large, since 12 air gaps of about 1.5 mm and about 10% of the allowable eccentricity have been known as design guidelines for short-circuiting motors, with an allowable eccentricity of about 0.1 mm.

According to some embodiments, the roller drive 5 10 provided with a permanent magnet rotor permits the eccentricity of movement of the rotor 11 within the stator 12, which is 60% of the air gap between the rotor and the stator, i.e. about 3 mm.

The foregoing description provides non-limiting examples of some embodiments of the invention. However, it will be apparent to one skilled in the art that the invention is not limited to the details set forth, but that the invention may be practiced in other equivalent ways.

Some features of the embodiments shown may be utilized without the use of other features. The foregoing description is to be construed as merely describing the principles of the invention and not limiting it. Thus, the scope of the invention is limited only by the appended claims.

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Claims (12)

A fiber web machine drying cylinder (1), comprising a sheath (2) for treating a fiber web and a shaft (3, 23) fixed within the manifold and rotatably supported against a plant body (F) by means of a bearing (4). ) mounted in a bearing housing (5), and the drying cylinder comprises a roller drive (10) for rotating the manifold through the mediation of the shaft, and the roller operation comprises a stator housing (14) and a stator housing (12) with stator windings, and the roller operation comprises a rotatable rotor (11) affecting the shaft and in use arranged to be surrounded by the stator windings such that an air gap (13) is arranged between the stator and the rotor and the rotor (11) is arranged to be fixed in connection with the shaft (3). 23) so that the shaft (3, 23) carries the mass of the rotor (11), characterized in that - the rotor (11) is permanently magnetically magnetized to enable a large air gap (13); 15. The stator housing (14) is arranged to be secured outside the bearing housing (5) so that the bearing of the stator (12) and the mass of the stator housing are arranged in an independent manner relative to the bearing of the rotor; and - that the air gap (13) is 2 to 5 mm, preferably 3 mm. Drying cylinder according to claim 1, characterized in that the permanent magnetic magnetization of the rotor (11) has been carried out by attaching one or more permanent magnets (1T) to the shaft (23) of the rotatable roller (1), preferably directly to the shaft. CVI o 25 Drying cylinder according to claim 1 or 2, characterized in that the rotor uS (11) comprises a shaft extension (20) attachable in the shaft cylinder (1) (20, 21) to σ> which, preferably directly on the shaft extension, is permanently attached to the shaft. x permanent magnetic magnetization of the rotor. CL ^ 30 Drying cylinder according to any one of claims 1 - 3, characterized in that the o stator housing (14) seen from the manifold (2) is arranged behind the bearing (4). CVJ Drying cylinder according to any of claims 1 to 4, characterized in that the stator housing (14) is fixed to the bearing housing (5). Drying cylinder according to any of claims 1-5, characterized in that the stator housing (14) is fixed to the installation body (F). Drying cylinder according to any of claims 1 to 6, characterized in that one or more permanent magnets (11 ') are arranged on the shaft (23), behind the bearing housing (5) as seen from the manifold (2). 10 Drying cylinder according to any of claims 1 to 7, characterized in that one or more permanent magnets (1T) are arranged on the shaft extension (20, 21), behind the bearing housing (5) as seen from the man (2). Drying cylinder according to any of claims 1 to 8, characterized in that the roller operation (10) is stored with the roller (1) bearings (4) outside the stator housing (14). Drying cylinder according to any of claims 1 to 9, characterized in that the stator housing (14) comprises at least one feed for the rotor (11). 20 Drying cylinder according to any of claims 1-10, characterized in that the stator housing (14) comprises a seal (16, 18) between the rotor (11) and the bushing to prevent foreign substances from being admitted into the rolling operation (10). C \ l o 25 Method for mounting a roller drive (10) to a drying cylinder (1), wherein said roller drive (10) is arranged to rotate the casing (2) of the drying cylinder by σ> mediating a shaft (3, 23), said shaft (3) 23) by means of a bearing (4) mounted in an x bearing housing (5) rotatably supported against a plant body (F), CL and the roller operation (10) comprises a stator housing (14) and a stator (12) fixed in the housing. With stator windings, and the roller operation (10) comprises a rotatable rotor (11) acting on the shaft, and in the method the rotor is arranged surrounded by the stator windings C \ J so that between the stator and the rotor, an air gap (13) is mounted and the rotor ( 11) in connection with the shaft (3, 23) so that the shaft (3, 23) carries the mass of the rotor (11), characterized in that the rotor (11) is permanently magnetically magnetized to enable a large air gap (13), and in the method - the stator housing (14) is attached outside the bearing housing (5) so that the mass of the stator (12) and the stator housing b RS independently in proportion to bärningen 5 of the rotor; and - the air gap (13) is arranged to be 2 to 5 mm, preferably 3 mm. C \ J δ (M i tn o i σ> (M X and CL CD δ σ> o o (M