WO2001086781A1 - Entrainement pour rouleaux mobiles - Google Patents

Entrainement pour rouleaux mobiles Download PDF

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Publication number
WO2001086781A1
WO2001086781A1 PCT/FI2001/000426 FI0100426W WO0186781A1 WO 2001086781 A1 WO2001086781 A1 WO 2001086781A1 FI 0100426 W FI0100426 W FI 0100426W WO 0186781 A1 WO0186781 A1 WO 0186781A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
roll
shaft
rotor
drive
Prior art date
Application number
PCT/FI2001/000426
Other languages
English (en)
Inventor
Vesa Kajander
Carl-Johan Friman
Original Assignee
Abb Research Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Research Ltd filed Critical Abb Research Ltd
Priority to AU2001258461A priority Critical patent/AU2001258461A1/en
Priority to EP01931758A priority patent/EP1303900A1/fr
Publication of WO2001086781A1 publication Critical patent/WO2001086781A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/02—Mechanical driving arrangements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0006—Driving arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos

Definitions

  • the present invention relates to a roll drive for moving rolls, the drive comprising a roll connected to a moving structure, and a motor ar- ranged to rotate the roll and comprising a stator and a rotor.
  • Some rolls and operating positions of paper machines and other similar machines as well as of paper post-processing machines are movable.
  • the movement can be from a few centimetres even to a couple of metres.
  • Such rolls include, for instance, size press, calender and centre reeler rolls.
  • the torque produced by a motor rotating the roll has to be transferred to the moving roll.
  • a stationary motor can be connected to a moving roll, for instance, by means of a long cardan, the joints of which allow the movement of the roll. It is also possible to use a belt transmission when a motor or other primary wheel of the belt transmission is mounted at the axis of movement. The complex mechanics then allows the roll movement and transmits the torque of the motor to the roll in spite of its movement.
  • the stationary motor with a transmission allowing the roll movement is expensive and takes up a lot of space. Because of the system's low natural vibration frequency in the direction of rotation, long cardans and belt drives cause control problems for the electric drive. Also the angular velocity variation caused by cardan joints reduces the accuracy of the control.
  • the belt transmission requires maintenance and causes noise.
  • a conventional motor can be fixed at its frame to a moving part of the machine and a motor shaft by means of a coupling to a roll to be used.
  • the torque of the motor is transmitted via the coupling to the roll to be used.
  • This kind of solution increases the mass of the moving mechanics and the need for space considerably, because the motor requires a mounting base and the shaft needs a coupling in order for it to be fixed to the roll shaft.
  • a conventional squirrel-cage induction motor is used, also a reduction gear must often be used in order to achieve the required torque.
  • the reduction gear fur- ther increases the mass of the moving mechanics.
  • the publication US 3997952 discloses such a roll drive to which a motor is connected, and a reduction gear transmitting the torque from the motor to the roll.
  • the publication DE 4422097 A1 discloses a drive arranged to rotate a cylinder of a printing machine and comprising a radial type of motor as a motor.
  • the rotor of the motor is arranged directly at the shaft of the cylinder and the stator is secured to the wall to prevent the stator from rotating.
  • the motor disclosed in the publication is very difficult to replace if there is a failure, because the rotor is directly arranged at the shaft of the roll, whereby in case of failure, the entire combination must be replaced. Therefore, the solution according to the publication is not suitable for objects where the sizes of cylinders and motors rotating them are large and where the defective motor has to be replaced quickly.
  • An object of the present invention is to provide a roll drive which avoids the above mentioned drawbacks and enables a moving roll to be controlled in a more reliable way than before and by utilising simpler equipment.
  • the object is achieved by a roll drive according to the invention, which is characterized in that the motor of the roll drive is an axial flux motor whose rotor shaft is directly connected to a shaft of the roll so that the shaft of the roll supports the motor, and that the motor is supported at the stator by means of a supporting arm on said moving structure, and that the roll drive further comprises a frequency converter arranged to control the axial flux motor fixed to the shaft of the roll.
  • the invention is based on the idea that an axial flux motor can be directly connected to the shaft of a movable roll, whereby no gears nor couplings are required between the motor and the roll when the rotor shaft of the motor is directly fixed to the shaft of the roll.
  • the mass to be moved does not increase considerably, because the torque ob- tained from the axial flux motor is considerably bigger than that of a common squirrel-cage induction motor with the corresponding frame sizes of the motor.
  • the solution implemented with the idea according to the invention avoids the use of a coupling and gear, whereby the control becomes more accurate and the use of wearing mechanical parts can be avoided.
  • Figure 2 shows a perspective view of Figure 1.
  • Figure 1 shows a roll drive of the invention for moving rolls, wherein a roll 1 is pivotally fixed to a moving structure 3.
  • a motor 2 comprising a stator and a rotor is arranged to rotate the roll.
  • Moving rolls are needed in many different objects, for instance paper machines and paper postprocessing apparatuses. Moving rolls are used, for instance, for controlling the opening of nips between the rolls.
  • Such an application can be a calender wherein clear openings are formed between the rolls for the duration of the paper web feeding, whereas in the actual calendering stage the rolls are pressed firmly against each other in order to polish the paper in a desired way.
  • Another application is in connection with centre reelers, whereupon as the amount of material to be rolled increases, the diameter of the roll increases. As the diameter increases, in certain applications the roll is moved a distance corresponding to the increase of the diameter.
  • the motor of the roll drive according to the invention is an axial flux motor 2 whose rotor shaft 5 is directly connected to a shaft 4 of the roll so that the shaft 4 of the roll supports the motor 2.
  • An axial flux motor is a motor whose rotor and stator are made of disc-like plates the surfaces of which are provided with elements producing an electromotive force.
  • the stator is typically provided with windings magnetisable with electric current, which are magnetised in a desired manner by using a frequency converter, for example.
  • the rotor of the axial flux motor 2 is permanently magnetised according to a preferred embodiment of the invention, whereby the surface of the disc-like rotor is provided with objects of a permanent magnet material in an appropriate manner.
  • a permanent magnet rotor provides the advantages of reducing the need for cooling and providing the motor drive with a great torque.
  • the axial flux motor thus operates as a synchronous ma- chine which can be controlled very accurately by utilising current frequency converters.
  • the structure of the axial flux motor 2 is generally disc-like and the rotor plate is between two stator plates, whereby the main flux of the motor is in the direction of the motor shaft.
  • the axial flux motor is very suitable for the drive of the invention, because the permanent magnets of the rotor are typically placed on the outer circumference of the rotor. The distance from the permanent magnets to the axis of rotation of the rotor directly affects the magnitude of the torque obtained from the motor.
  • the rotor of the axial flux motor need not necessarily be permanently magnetised, but the motor may also comprise a reluctance rotor or a squirrel-cage rotor.
  • the axial flux motor of the roll drive according to a preferred embodiment of the invention comprises a hollow rotor shaft 5.
  • the hollowness of the rotor shaft and particularly the large inner diameter of the hollow rotor shaft are possible because of the disc-like structure of the motor.
  • the central part of the disc-like motor will not be used for producing torque, which allows that lead-throughs can be made through the rotor shaft without reducing the efficiency of the machine or making the machine bigger because of the hollowness of the shaft.
  • the axial flux motor 2 is fixed at its hollow rotor to the shaft 4 of the roll 1 so that the roll shaft supports the motor. In other words, the motor does not rest on a fixed mounting base, nor is the moving structure provided with any additional supporting structures but is directly fixed to the roll 1.
  • the motor can also be mounted on retrofit objects, which means that a reduction gear possibly used earlier and a conventional motor can be replaced by an axial flux motor.
  • the motor can be fixed to the roll shaft similarly as current gears that are to be fixed to the roll shaft.
  • the fixing can be carried out, for instance, so that the end of the roll shaft is provided with a cone-shaped section against which the hollow rotor shaft of the motor pushes in reliably.
  • the cone-shaped section at the end of the shaft journal can be implemented, for example, by fixing, for instance by welding, a separate matching section to the shaft or, alternatively, by peeling the shaft end in order to have a desired conical shape.
  • Figures 1 and 2 show that the roll is supported by a moving structure 3 comprising the bearings of the roll.
  • the motor Since the motor is fixed to the roll shaft without a separate mounting bed, the motor is supported according to the invention at its stator by means of a supporting arm 6 on the moving structure 3.
  • the support is neces- sary because otherwise the stator of the motor would rotate in an undesired manner.
  • the supporting is carried out at the stator of the motor by means of a stiff supporting arm by connecting the supporting arm 6 to the moving structure 3 with which the motor 2 is intended to move.
  • the supporting arm must be so strong that in spite of great torque acting on it, the motor stays, with respect to the moving structure, securely in its place.
  • the function of the supporting arm 6, as was already explained earlier, is not the supporting of the motor.
  • One end of the supporting arm is fixed to the motor frame and the other end is fixed to the moving structure, such as the arm or the like supporting the roll and motor.
  • the axial flux motor comprises water cooling.
  • Water cooling can be implemented for example so that the supporting plate of the stator is provided with a spiral water pipe where cooling liquid is circulated. Said disc-like supporting plate is in close proximity to stator grooves containing windings, whereupon the heat produced by the motor can be efficiently transferred away from the motor.
  • the spirally placed cooling pipe is perpendicular to the stator grooves, whereupon the cooling is efficient enough for mounting the motor in difficult thermal conditions.
  • the size of the motor can be minimised, because it is not necessary to have an additional cooling surface in the dimensioning, and it can be placed in narrow places better than before.
  • An application requiring a small motor size is, for instance, a calender use wherein several rolls with rather small diameters are placed one on top of the other or side by side in close proximity to each other.
  • a frequency converter or other similar device by which the rotational speed of the motor 2 and the torque it produces can be controlled reliably and accurately, is arranged to control the roll drive.
  • a frequency converter can be a frequency converter with a voltage intermediate circuit, for instance. Since, according to an embodiment, the shafts of the roll and rotor are hollow, it is desirable for the simplicity of the drive that the frequency converter controlling the drive can carry out desired instructions regarding the torque and rotational speed without a direct feedback from the rotational speed of the roll and motor. It is cumbersome to arrange a tachometer deter- mining the rotational speed at the hollow shafts.
  • frequency converters are, for instance, solutions based on a direct torque control, whereby the state of the motor to be controlled can be modelled accurately and reliably after a model made of the motor, and whereby it is thus possible to avoid the mounting of the tachometer on the hollow shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

L'invention concerne un entraînement pour rouleaux mobiles comprenant un rouleau (1) relié à une structure mobile (3) ainsi qu'un moteur (2) conçu pour faire tourner ce rouleau et comprenant un stator et un rotor. Le moteur de cet entraînement est un moteur à flux axial (2) dont l'arbre de rotor (5) est directement relié à un arbre (4) du rouleau (1) de manière que l'arbre dudit rouleau supporte le moteur (2) et que le moteur (2) soit supporté au niveau du stator au moyen d'un bras de support (6) sur ladite structure mobile (3). Cet entraînement comprend également un convertisseur de fréquence conçu pour commander le moteur à flux axial (2) fixé à l'arbre (4) du rouleau (1).
PCT/FI2001/000426 2000-05-05 2001-05-04 Entrainement pour rouleaux mobiles WO2001086781A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001258461A AU2001258461A1 (en) 2000-05-05 2001-05-04 Roll drive for moving rolls
EP01931758A EP1303900A1 (fr) 2000-05-05 2001-05-04 Entrainement pour rouleaux mobiles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20001051 2000-05-05
FI20001051A FI117105B (fi) 2000-05-05 2000-05-05 Telakäyttö liikkuvia teloja varten

Publications (1)

Publication Number Publication Date
WO2001086781A1 true WO2001086781A1 (fr) 2001-11-15

Family

ID=8558335

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000426 WO2001086781A1 (fr) 2000-05-05 2001-05-04 Entrainement pour rouleaux mobiles

Country Status (4)

Country Link
EP (1) EP1303900A1 (fr)
AU (1) AU2001258461A1 (fr)
FI (1) FI117105B (fr)
WO (1) WO2001086781A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1340608A1 (fr) * 2002-02-21 2003-09-03 Reifenhäuser GmbH & Co. Maschinenfabrik Appareil de lissage
EP1460010A3 (fr) * 2003-03-19 2005-11-16 Voith Paper Patent GmbH Machine avec moteur électrique, de préférence moteur synchrone, pour entraíner directement le noyau d' une bobine, spécialement pour l'usage dans l'industrie de papier, et méthode de transformation en rapport avec cette machine
EP2061137A1 (fr) * 2007-11-19 2009-05-20 Siemens Aktiengesellschaft Dispositif de raccordement de machine d'un moteur à disque
EP2061136A1 (fr) 2007-11-19 2009-05-20 Siemens Aktiengesellschaft Engrenage direct électrique pour un cylindre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621133A1 (fr) 1991-11-22 1994-10-26 Baumüller Nürnberg Gmbh Procédé et arrangement pour un moteur électrique pour entraîner un corps de rotation, en particulier un cylindre d'imprimerie
EP0689277A2 (fr) * 1994-06-24 1995-12-27 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Moteur électrique pour entraîner un corps rotatif
US5918728A (en) * 1997-09-16 1999-07-06 Motion Systems, L.C.L.L.C. Gearless motorized roller with variable frequency controller

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061750A (en) * 1958-02-27 1962-10-30 Stegman Charles Burchard Pancake motor
DE4421406A1 (de) * 1994-06-18 1995-12-21 Skf Textilmasch Komponenten Einzelmotorischer Antrieb eines als permanentmagnetischer Läufer eines Axialfeldmotors ausgebildeten schaftlosen Spinnrotors und Verfahren zum Betreiben des einzelmotorischen Antriebes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621133A1 (fr) 1991-11-22 1994-10-26 Baumüller Nürnberg Gmbh Procédé et arrangement pour un moteur électrique pour entraîner un corps de rotation, en particulier un cylindre d'imprimerie
EP0689277A2 (fr) * 1994-06-24 1995-12-27 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Moteur électrique pour entraîner un corps rotatif
US5918728A (en) * 1997-09-16 1999-07-06 Motion Systems, L.C.L.L.C. Gearless motorized roller with variable frequency controller

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1340608A1 (fr) * 2002-02-21 2003-09-03 Reifenhäuser GmbH & Co. Maschinenfabrik Appareil de lissage
EP1340608B2 (fr) † 2002-02-21 2011-04-20 Reifenhäuser GmbH & Co. Maschinenfabrik Appareil de lissage
EP1460010A3 (fr) * 2003-03-19 2005-11-16 Voith Paper Patent GmbH Machine avec moteur électrique, de préférence moteur synchrone, pour entraíner directement le noyau d' une bobine, spécialement pour l'usage dans l'industrie de papier, et méthode de transformation en rapport avec cette machine
EP1787929A1 (fr) * 2003-03-19 2007-05-23 Voith Patent GmbH Machine ou section de machine dotée d'au moins un électromoteur développé de préférence en tant que moteur synchrone et/ou à emboîtement et destiné à l'engrenage direct d'un axe d'enroulement d'une bobine d'enroulement ou à l'engrenage direct d'un autre composant de rotation, en particulier destiné à l'utilisation dans l'industrie du papier, et son procédé de transformation
EP2061137A1 (fr) * 2007-11-19 2009-05-20 Siemens Aktiengesellschaft Dispositif de raccordement de machine d'un moteur à disque
EP2061136A1 (fr) 2007-11-19 2009-05-20 Siemens Aktiengesellschaft Engrenage direct électrique pour un cylindre
CN101442243A (zh) * 2007-11-19 2009-05-27 西门子公司 用于辊子的直接电驱动装置
JP2009131147A (ja) * 2007-11-19 2009-06-11 Siemens Ag ローラ用の電気的直接駆動装置
US8102095B2 (en) 2007-11-19 2012-01-24 Siemens Aktiengesellschaft Electrical direct drive for a roller

Also Published As

Publication number Publication date
FI20001051A (fi) 2001-11-06
AU2001258461A1 (en) 2001-11-20
FI117105B (fi) 2006-06-15
EP1303900A1 (fr) 2003-04-23

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