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WO2003008307A1 - Cylindre motorise - Google Patents

Cylindre motorise Download PDF

Info

Publication number
WO2003008307A1
WO2003008307A1 PCT/IT2001/000321 IT0100321W WO03008307A1 WO 2003008307 A1 WO2003008307 A1 WO 2003008307A1 IT 0100321 W IT0100321 W IT 0100321W WO 03008307 A1 WO03008307 A1 WO 03008307A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
tubular body
axle
motor
permanently magnetized
Prior art date
Application number
PCT/IT2001/000321
Other languages
English (en)
Inventor
Gianluigi Vigili
Original Assignee
Acm Engineering S.P.A.
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 Acm Engineering S.P.A. filed Critical Acm Engineering S.P.A.
Priority to PCT/IT2001/000321 priority Critical patent/WO2003008307A1/fr
Publication of WO2003008307A1 publication Critical patent/WO2003008307A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/02—Belt- or chain-engaging elements
    • B65G23/04—Drums, rollers, or wheels
    • B65G23/08—Drums, rollers, or wheels with self-contained driving mechanisms, e.g. motors and associated gearing

Definitions

  • the present invention relates to conveyor devices and systems for transferring articles or materials and in particular to a motor roller that may be used in such systems and devices.
  • the main requisites of these systems are those of sustaining the articles or materials that are being transferred and of advancing them, often in a precisely controlled manner.
  • belt conveyor "handling machines” are machines generally employed for transferring packed materials to specific destinations that are assigned to the single packets by affixing a bar code thereon. Very often the extension of such machines are comparable to that of the building in which they are installed, therefore the number of parts and components to be used for constructing them, their weight and their encumbrance are determinant factors ad well as their costs.
  • minimum encumbrance, lightness, straightforward mechanical design (which is a factor of reliability) are generally required together with the possibility of controlling the motion of the motor rollers not coarsely but in a substantially deterministic fashion, which often becomesthe most important requisite.
  • Merit figures of motors employed for driving the rollers relate basically to mechanic and electric time constants, pass band (ever increasing critical operating- frequencies), inertia (affecting the speed of response) and last but not least efficiency that determines valuable energy saving. Moreover, large pulsed torque values allow to perform a great number of destinations per hour.
  • motor rollers with relative driving motor and epicyclical speed reduction gear conveniently installed inside the roller itself substantially made of a hollow cylinder or drum of adequate rigidity have been proposed.
  • the driving motor is either a DC motor or a synchronous motor coupled to an epicyclical speed reduction gear box whose output shaft is connected to the drum by a disk keyed to the output shaft of the reduction gear and fastened to the inner surface of the cylindrical drum by stud screws, bolts, or other suitable fasteners.
  • the motor-reduction gear assembly is fixed on the supporting structure of the roller. Commonly the assembly is fastened to shoulders or lateral plates of the structure destined to rotably support the rollers.
  • a bearing of the drum may be installed on the supporting arm of the motor-reduction gear assembly and connected to the drum for preventing any undesired slanting of the drum in respect to the axis of rotation of the output shaft of the motor-reduction gear in order to reduce assembly vibrations and make the motor roller mechanically more stable.
  • control and regulation of the speed of the motorized roller often imply the use of sensors installed around the roller on which small magnets may commonly be installed, for cooperating with externally positioned Hall effect sensors, from the output signals of which it is possible to decode both the direction of rotation and the speed of rotation of the roller.
  • the electronic control and regulation systems function in a closed loop current mode.
  • An essential feature of the invention is the fact that the cylindrical drum or at least a portion of it is a functional part of a permanent-magnet motor.
  • At least a cylindrical portion of the hollow drum that constitutes the roller is made of a material having a high magnetic permeability and a thickness sufficient to provide paths for the magnetic flux to close the magnetic circuit between poles of opposite sign defined, one adjacent to the other, in a tubular body that is permanently magnetized per longitudinal stripes and that fits inside and is fastened to the cylindrical portion of the drum of the material of a material of high magnetic permeability.
  • the drum and the permanently magnetized cylindrical body defining a plurality of magnetic poles of alternated sign along the circumference constitute together an "outer rotor" cooperating with an inner stationary axle-stator, coaxially fitting inside the tubular body permanently magnetized per longitudinal stripes.
  • outer rotor is rotably supported by at least a bearing installed on the stationary axle of the axle-stator that is mechanically fixed to an external support structure.
  • the whole hollow cylindrical drum may be of steel of high magnetic permeability or may even be such a material only for a portion of its total length (e.g. corresponding to the width of the conveyor) for allowing the use of a lighter nonmagnetic material, for a example reinforced resin, for constituting the remaining portion of the drum when weight reduction is of primary importance and/or particularly long rollers are needed. While ensuring an absolute absence of magnetic lines of force outside the roller, as may be required for transferring products adversely affected by magnetic fields, the thickness of the cylindrical wall of the drum of a material of high magnetic permeability may be as small as 1.5 mm, as it will be illustrated in greater detail in the ensuing description.
  • the medium for closing the paths of magnetic fluxes and for providing an effective shield ensuring absence of any stray line of force outside the roller may be in the form of a sleeve of steel of high magnetic permeability fitted on the outer cylindrical surface of the permanently magnetized tubular body.
  • Such a subassembly may be installed inside the drum and fixed to it by means of a structural adhesive and/or by screws, bolts and the like.
  • the tubular body of permanently magnetizable material may be of any known material commonly used for permanent magnets.
  • a sintered cylinder of magnetic material containing neodymium may be used.
  • Cylinders of so-called plasto-neodymium produced and marketed by the Chinese KONIT INT. CO. may be used satisfactorily.
  • the length of the tubular body of a permanently magnetized material per longitudinal stripes is a determining parameter of the motor design.
  • a parameter, or more precisely the ratio diameter/length be excessively small and such to make difficult the fabrication of relatively long sintered tubular bodies, it is possible to realize the tubular body as a composite, instead of in single piece, simply by stacking together cylindrical "modules" having a ratio diameter/length appropriately large for the fabrication technology of such sintered articles as needed to reach a desired total length of the composite tubular body .
  • the distinct segments or modules are abutted end to end before magnetizing the composite tubular body per longitudinal stripes, thus avoiding the problem of forcibly abutting magnetic poles of the same polarity.
  • the distinct tubular segments may be held together by bonding with a structural adhesive of appropriate characteristics, eventually using also a heat-shrinkable plastic sheath and/or be connected one to the other by means of brackets, screws and the like.
  • abutting end surfaces of the cylindrical segments stacked together may be provided with indentations and protrusions cooperating with each other to register the relative positions of the two pieces and prevent any mutual rotation of a piece about the other, especially in the case in which only a sheath of heat-shrinking material is used for holding the tubular modules together.
  • the so assembled composite cylindrical body is then magnetized per longitudinal stripes, according to the known techniques normally used for this purpose.
  • Figure 1 is a simplified partial sectional view of a motor roller of the present invention
  • Figure 2 is a sectional view illustrating a preferred embodiment of the outer rotor of the motor roller of the invention
  • Figure 3 depicts a modular embodiment of the permanently magnetized cylindrical body of the motor roller of the invention
  • Figure 4 depicts the profile of the die stamped ferromagnetic laminae of the axle- stator of the motor roller according to an embodiment of the invention as exemplified in previous figures;
  • Figures 5 and 6 show a possible embodiment of permanently magnetized concentric rings for realizing a position and speed transducer;
  • Figures 7 and 8 show the disk on which are adjustably fixed magnetic sensors cooperating with the concentric rings of Fig. 5 for implementing the transducer.
  • the peculiarity of the motor roller of the invention is the fact that advantageously it does not include any speed reducing and mechanical transmission device.
  • the motor roller 1 comprises a drum 2 that may be for example a hollow cylinder of mild steel of high magnetic permeability and with a wall thickness of no less than 1.5 mm and a length suited to need.
  • the tubular body may be a sintered cylinder of plasto-neodymium produced by the Chinese KONIT INT. CO.
  • the dimensions of the tubular body 3 are: length 57 mm, outside diameter 48 mm,, inside diameter 43 mm.
  • the inside diameter of the ferromagnetic portion of the drum 2 is equal to the outside diameter of the permanently magnetized tubular body 3 plus a minimum tolerance just for allowing the insertion of the tubular body 3 inside the drum 2.
  • tubular bodies are mechanically connected to constitute a cylindrical composite rotor.
  • Connection of the tubular body 3 to the outer drum 2 may be realized using a structural adhesive of suitable characteristics, according to common techniques of fabrication of permanent-magnet motors.
  • Fig. 2 depicts a sectional view of the outer cylindrical rotor of the motor roller of the invention defining, in the considered case, twenty four magnetic poles.
  • the poles are defined by magnetizing the tubular body 3 by twentyfour longitudinal stripes of equal angular extension along the circumference of the cylindrical body.
  • a axle-stator 4 whose axle 5 has a longitudinal channel 5a in which supply wires of the phase windings of the motor (not depicted in the mentioned figure) are arranged, is fixed to a supporting structure (not depicted in the mentioned figure) and the drum 2 is rotably sustained in a perfectly coaxial position in respect to the axle-stator 4 by a first bearing 6, which in the illustrated example is installed inside a "cup" terminal 7 of the drum 2, for example of a resin or of a light alloy.
  • a second anti-flection bearing 8 installed on the same axle 5 of the axle-stator 4 on the other side of the stator, in order to prevent flections of the rotating drum 2 about the axis of the axle-stator 4.
  • This second anti-flexion bearing 8 is kept in position by a common Seeger ring 9 and by a bearing-stopper sleeve 10 or by any other mechanical stopper.
  • drum 2 and the permanently magnetized tubular body 3 connected to it rotate around the axle-stator 4 that is mechanically connected to the supporting structure of the motor roller.
  • Fig. 4 shows the profile of the die stamped laminae 12 that are customarily stacked together to compose the ferromagnetic pack of the axle-stator 4.
  • the ferromagnetic pack of the axle-stator 4 defines eighteen channels in which three phase windings are arranged.
  • the axle-stator 4 includes six coils of 1:2 pitch connected in series for each of the three 'phases, the number of turns of which is established in function of the supply voltage and of the required maximum speed.
  • the motor roller of the invention may be driven in a precisely controlled way even using control and driving electronic systems suitable to implement sensorless control and synchronization algorithms of the phase switchings that do not require any sensor of the angular position of the outer rotor, that is of the drum 2.
  • controlling and driving in perfect synchronism the motor roller of the invention may be based on the use of specific speed and position sensors.
  • FIG. 1 Such an embodiment is depicted in Fig. 1, wherein the such assembly of the speed and position transducers is indicated as a whole by 11.
  • the transducers are composed of a pair of concentric rings 13 and 14 of a material permanently magnetized per sectors mechanically connectable to an extremity of the drum 2 in order to rotate with it.
  • a first ring 13 for example of ferrite or of plasto-neodymium, is magnetized per sectors of identical and minimum angular size, thus defining for example 120 magnetic poles of alternated sign along the circumference.
  • a second ring 14 also constituted of ferrite or of plasto-neodymium, is magnetized per sectors of identical angular size defining the same number (24) of magnetic poles of the motor roller.
  • a disk 15 for example of glass-fiber reinforced plastic PCB, has sensors mounted thereon and has copper connection pads P patterned thereon.
  • the disk is mounted on the supporting axle 5 of the axle-stator 4 of the motor roller with the sensors facing toward the rotating rings 13 and 14 of permanently magnetized material.
  • At least three sensors A, B and C generate discrimination signals of the angular position of the drum (outer rotor) and at least a cell D end codes the speed of rotation.
  • the relative angular position of the disk 15 carrying the sensors on the hub 16 fixed on the supporting axle 5 of the axle- stator 4 may be adjusted when trimming the control and driving system of the motor roller.
  • the transducers for detecting the angular position and the speed of the motor roller and the relative encoding and decoding systems of the signals coming from sensors may be of different types and be chosen among many known devices used for these purposes.
  • the technological problem of fabrication may be overcome by using rings realized with comb-like die stamped laminae of a ferromagnetic sheet material, whose teeth define as many magnetic poles.
  • the transducers may be of optical kind employing photodiodes and phototransistors and rings of an opaque material provided with radially extending slits, according to well known techniques.
  • the thickness of the whole drum 2, or of the portion of high magnetic permeability, is sufficient to provide paths for the magnetic flux closing the plurality of magnetic circuits between adjacent poles defined in the tubular body 3 of material permanently magnetized per longitudinal stripes without reaching a saturation condition of the ferromagnetic material of the drum 2.
  • the drum 2, or the segment made of a material with high magnetic permeability constituting together the tubular body 3 permanently magnetized per stripes the outer rotor of the motor roller of the invention perfectly contains all magnetic fluxes and ensures an absolute absence of magnetic interferences with the transported articles or materials.
  • the relative sub-assembly 11 may be easily shielded to prevent stray lines of force outside the shielding case.
  • the motor roller of the invention offers many advantages.
  • the total weigh of the motor roller of the invention is sensibly reduced in respect to a motor roller of the prior art of comparable characteristics.
  • the motor roller may be designed with a much greater freedom than prior art. rollers to achieve the maximum reduction of encumbrance.
  • Direct control of the motor roller improves its dynamic performance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)

Abstract

L'invention concerne un cylindre (1) motorisé servant à transférer des articles et des matériaux, qui comprend un tambour (2) cylindrique creux fait d'une matière à perméabilité élevée et maintenu rotatif sur une structure ; et un moteur d'entraînement contenu à l'intérieur du tambour (2). Le cylindre présente un corps (3) fritté tubulaire sensiblement cylindrique, fait d'une matière magnétisée en permanence par des bandes longitudinales qui définissent une pluralité de pôles magnétiques de signe alterné, sont aménagées sur le pourtour du corps (3) tubulaire installé dans ledit tambour (2) et mécaniquement reliées à celui-ci ;c un espace minimum séparant la surface extérieure du corps (3) tubulaire magnétisé en permanence et la surface intérieure du tambour (2). La surface cylindrique du tambour (2) présente une épaisseur suffisante pour assurer la fermeture de la pluralité des circuits de flux magnétique, entre les pôles de signe opposé adjacents définis dans ledit corps (3) tubulaire, sans atteindre les conditions de saturation. Un stator-essieu (4) maintenu sur un essieu (5) est fixé à la structure support et permet de maintenir le tambour creux grâce à au moins un palier monté sur l'essieu. Un système d'entraînement des enroulements de phase du stator-essieu (4), synchronisé avec la position angulaire du rotor extérieur constitué par le tambour (3), régule en boucle fermée la vitesse de rotation du moteur dans un certain sens de rotation.
PCT/IT2001/000321 2001-07-18 2001-07-18 Cylindre motorise WO2003008307A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2001/000321 WO2003008307A1 (fr) 2001-07-18 2001-07-18 Cylindre motorise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2001/000321 WO2003008307A1 (fr) 2001-07-18 2001-07-18 Cylindre motorise

Publications (1)

Publication Number Publication Date
WO2003008307A1 true WO2003008307A1 (fr) 2003-01-30

Family

ID=11133684

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2001/000321 WO2003008307A1 (fr) 2001-07-18 2001-07-18 Cylindre motorise

Country Status (1)

Country Link
WO (1) WO2003008307A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005051809A1 (fr) * 2003-11-25 2005-06-09 Van Der Graaf Inc. Rouleau de bande transporteuse motorise a extremites fixes
US7777440B2 (en) 2005-08-01 2010-08-17 Itoh Denki Co., Ltd. Motor driving circuit and method for controlling a motorized roller
US7806252B2 (en) 2008-02-05 2010-10-05 Kanaris Alexander D Conveyor drive roller
WO2013020725A1 (fr) * 2011-08-10 2013-02-14 Powertrans S.A. Convoyeur continu pour le transport de produits lourds, en vrac ou en colis
DE102015114030A1 (de) * 2015-08-24 2017-03-02 Interroll Holding Ag Trommelmotor und Sensorkartusche für einen Trommelmotor
WO2018013048A1 (fr) * 2016-07-14 2018-01-18 Flexlink Ab Transmission magnétique pour un transporteur
CN110589350A (zh) * 2019-08-27 2019-12-20 上海同厚实业有限公司 一种辊轮架

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5923111A (en) * 1997-11-10 1999-07-13 Goulds Pumps, Incoporated Modular permanent-magnet electric motor
US6244427B1 (en) * 1997-09-16 2001-06-12 Motion Systems, L.C. Modular gearless motorized conveyor roller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244427B1 (en) * 1997-09-16 2001-06-12 Motion Systems, L.C. Modular gearless motorized conveyor roller
US5923111A (en) * 1997-11-10 1999-07-13 Goulds Pumps, Incoporated Modular permanent-magnet electric motor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7510073B2 (en) 2003-11-25 2009-03-31 Van Der Graaf, Inc. Motorized drum roller with stationary ends
WO2005051809A1 (fr) * 2003-11-25 2005-06-09 Van Der Graaf Inc. Rouleau de bande transporteuse motorise a extremites fixes
US7777440B2 (en) 2005-08-01 2010-08-17 Itoh Denki Co., Ltd. Motor driving circuit and method for controlling a motorized roller
USRE44919E1 (en) 2008-02-05 2014-06-03 Alexander D. Kanaris Conveyor drive roller
US7806252B2 (en) 2008-02-05 2010-10-05 Kanaris Alexander D Conveyor drive roller
US8292064B2 (en) 2008-02-05 2012-10-23 Alexander D. Kanaris Conveyor drive roller
USRE44907E1 (en) 2008-02-05 2014-05-27 Alexander D. Kanaris Conveyor drive roller
CN103906691A (zh) * 2011-08-10 2014-07-02 强力输送装置有限公司 用于输送很重的散装货物或单件货物的连续式输送机
WO2013020725A1 (fr) * 2011-08-10 2013-02-14 Powertrans S.A. Convoyeur continu pour le transport de produits lourds, en vrac ou en colis
US9527670B2 (en) 2011-08-10 2016-12-27 Caterpillar Global Mining Europe Gmbh Continuous conveyor for transporting heavy bulk materials or unit loads
EA028453B1 (ru) * 2011-08-10 2017-11-30 Катерпиллер Глобал Майнинг Юроуп Гмбх Транспортер непрерывного действия для транспортировки тяжелых сыпучих материалов или штучных материалов
US10589936B2 (en) 2011-08-10 2020-03-17 Caterpillar Global Mining Europe Gmbh Continuous conveyor for transporting heavy bulk materials or unit loads
DE102015114030A1 (de) * 2015-08-24 2017-03-02 Interroll Holding Ag Trommelmotor und Sensorkartusche für einen Trommelmotor
WO2018013048A1 (fr) * 2016-07-14 2018-01-18 Flexlink Ab Transmission magnétique pour un transporteur
US10538392B2 (en) 2016-07-14 2020-01-21 Flexlink Ab Magnetic transmission for conveyor
CN110589350A (zh) * 2019-08-27 2019-12-20 上海同厚实业有限公司 一种辊轮架

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