SINGLE-STAGE ELECTROMAGNETIC ELEVATOR MODELLING IN FEMM SOFTWARE

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1 8th Interntionl DAAAM Blti Conferene "INDUSTRIAL ENGINEERING April 2012, Tllinn, Estoni SINGLE-STAGE ELECTROMAGNETIC ELEVATOR MODELLING IN FEMM SOFTWARE Lpkovskis, V., Mironovs, V. Astrt: In present pper n eletromgneti elevtor (onveying devie) designed in Rig Tehnil University (Ltvi) is desried. Modelling of single-stge eletromgneti elevtor in FEMM softwre is suggested. Anlysis of eletromgneti field distriution reted y multi-turn oil used s propulsion men for onveying of ferromgneti mterils y eletromgneti field is presented. Use of different oil mterils nd oil dimensions is evluted. Key words: eletromgneti elevtor, FEMM softwre, oil 1. INTRODUCTION There re mny speifi industril pplitions of eletromgneti fields: sensors, tutors, vlves, virtion gittors, prtiulte filters nd gret mny other tehnil pplitions. Amongst them there is ple for speifi pplition of pulsed eletromgneti field, nmely for onveying of ferromgneti mterils in tues. A milliseond impulse of eletromgneti field is ting s propulsion men for moving of ferromgneti mterils inside tue. Ferromgneti powders mnufturing industry is one of the end-users of presented pproh [1]. Nowdys mnufturers of ferromgneti powders re using trditionl srew [2], elt onveyors, uket elevtors, hin tuulr onveyors [3] or pneumti onveying systems [4] for powder hndling. Due to extensive wer of onstrution mterils, periodi 321 mintenne of suh onveyors is required. Moreover, powder rw mterils re eoming ontminted of wer produts (prtiles). The eletromgneti onveyor n e onsidered s solution for ertin industril pplitions, nd espeilly in powder metllurgy. One of the most demnding tsks is onveying of ferromgneti powders in vertil pipes for further proessing. As possile solution the Powder Mterils Lortory of Rig Tehnil University hs designed lortory-sle singlestge eletromgneti system for powder onveying on short distnes (up to 5 meters) in pipes [5]. Sheme of lortory equipment EMC-05 [6] for ferromgneti powder onveying y impulse eletromgneti fields is shown in Fig. 1. In our lortory setup power unit is produed y HBS Bolzenshweiss- Systeme GmH [7] hs een used. Fig. 1. Shemti of the equipment used for ferromgneti powders onveying y impulse eletromgneti field. 1 trnsformer, 2 retifier, 3 tri (thyristor), 4 hrging resistor, 5 dishrging thyristor, 6 onveyor trt, 7 oil, 8 ferromgneti powder, 9 - pitor ttery.

2 Shemtilly the pproh for onveying y eletromgneti fields is shown in Fig. 2. Fig. 2. Shemti ferromgneti mterils onveying in vertil pipe. 1 pipe (onveyor trt), 2 eletromgneti oil, 3 reservoir filled with ferromgneti powder (iron powder), 4 gripping of ferromgneti powder y impulse eletromgneti field pplied, 5 oil onnetion to the genertor of eletromgneti urrents (power unit). Industril iron powders hve iron ontent %. Speifitions of iron powders suitle for trnsporttion y eletromgneti field re presented in Tle 1. Prtile size rnge, μm Fe ontent in powder (y weight), % Apprent density of powder, g/m -3 Tle 1. Iron powders used for onveying y impulse eletromgneti field. 2. ELECTROMAGNETIC CONVEYOR MODEL IN FEMM We hve hosen the FEMM - powerful free softwre for eletromgneti prolems modelling [8], [9]. FEMM is 2D FEA softwre pkge developed y Eng. D. Meeker [10]. There re different models of elertor devies where pulsed eletromgneti fields re used [11]. In se of fine prtiles (or iron powders) the relutne onveying pproh ws used [12]. A seleted pproh is sed on the ttrtive ferromgneti properties of the trnsportle mteril whih provoke elertion. FEMM modelling is relised for the omputtion of the fore on mss of iron powder t vrious positions reltive to wound ir-ored oil. For modelling of eletromgneti field distriution set of wound ir-ore oils hs een used (Tle 2.). A ross-setionl view of oil is shown in Fig. 3. Fig. 3. Coil ross-setionl view. w winding thikness, ; h winding height, ; d oil's internl (wound) dimeter, Coil No. Winding mteril w, h, Coil(01) Copper Coil(02) Aluminium Coil(03) Copper Tle 2. Eletromgneti oils used for modelling in FEMM. d, In order to evlute n eletromgneti lifting fore for urrent model set of ferromgneti powder odies (ylindril powder fillings) hs een defined (Fig. 4., Tle 3.) Fig. 4. Powder odies used for the modelling of eletromgneti elevtor. 322

3 Lel of powder ody h 1, r 1, Tle 3. Dimensions of ferromgneti powder odies used for modelling. A shemti of eletromgneti elevtor input geometry is shown in Fig. 5. Initilly, the powder ody is loted underneth the oil. Coil No Clulted soure urrent density, MA/m 2 Coil(01) Coil(02) Coil(03) Eletril ondutivity of wire mteril, MS/m Tle 4. Power soure urrent density, nd eletril ondutivity of oils. The following ssumptions of FEMM model hve een tken into ount: stedy urrent (in oil), no eddy urrents, simultion for every position (shift) of powder ody long the z-xis is lulted for the stedy-stte onditions. Exmple of mgneti field density plot for Coil(01) is shown in Fig. 6. Fig. 5. Eletromgneti elevtor: xisyetri model set-up in FEMM. 1 - syetry xis, 2 iron powder, 3 outer oundry of interior region, 4 oil ross-setion, 5 interior region (ir). It ws estlished experimentlly tht for the lortory devie the miniml voltge of impulse urrent soure when it is possile to oserve nd register lifting phenomenon of fine ferromgneti mterils is 50 V. Thus, for the FEMM model the similr onditions hve een hosen. Coil eletril input prmeters [13] for the model re shown in Tle 4. Fig. 6. Mgneti field density plot for Coil(01). For evlution of eletromgneti intertion etween oil nd powder ody, progre written in Lu lnguge [14] hs een used. The following tions re performed during n exeution of Lu sript: ) Shifting powder ody long z-xis, ) Performing numeril nlysis of the model, ) Clulting z-direted omponent of fore for every position of powder ody. 323

4 3. RESULTS Output results of fore vs. distne etween powder ody nd oil entre modelling re presented elow in Fig. 7, 8, 1.20E E E E E E E E Fig. 7. Fore vs. distne etween powder Coil(01) lulted for powder odies (), 3.00E E E E E-03 Distne etween surfe powder nd oil entre, -5.00E-03 Distne etween surfe powder nd oil entre, Fig. 9. Fore vs. distne etween powder Coil(03) lulted for powder odies (), It is evident tht oil's geometry plys n importnt role in onveying model. For Coil(02) nd Coil(03) the mximum of fore is hieved t the entrne of oil wound or in the first hlf of oil's height. In the sme time the highest fore vlues hve een shown y Coil(01). In ft, the experiments onfirm the effetiveness of Coil(01) [15]. The est simultion results hve een shown y oil mde of opper wire e.i. Coil(01). 4. FURTHER RESEARCH Further reserh is neessry for pilot equipment onstrution, whih n e used in rel mnufturing filities. The modelling proedure n help in design of low-energy pilot equipment for onveying of ferromgneti mterils. Menwhile, it is importnt to evlute n influene of eletromgneti impulse fields on powder segregtion, espeilly in se of ontinuous exploittion. FEMM softwre will e used for modelling of different mixing equipment sed on eletromgneti phenomen [16]. 6.00E E E E E-02 Fig. 8. Fore vs. distne etween powder Coil(02) lulted for powder odies (), -1.00E-02 - Distne etween surfe powder nd oil entre, CONCLUSIONS The FEMM softwre is useful instrument for evlution of different geometries nd mterils used in design of eletromgneti elevtor. Modelling pproh hs onfirmed previous reserh on onstrution of eletromgneti onveying equipment. The following modelling is neessry for evlution of omintion of ftors influening on the effetiveness of eletromgneti elevtor. 6. ADDITIONAL DATA ABOUT AUTHORS

5 Mr. Vjeslvs Lpkovskis, Reserher. Azenes str. 16, l. 331, LV-1048, Rig, Ltvi Ph. (+371) Mr. Viktors Mironovs. Dr.h.S.ing. Azenes str. 16, l. 331, LV-1048, Rig, Ltvi Ph. (+371) Corresponding Author: Mr. Vjeslvs Lpkovskis, Ph. (+371) AKNOWLEDGEMENTS This work hs een supported y the Europen Soil Fund within the projet Support for the implementtion of dotorl studies t Rig Tehnil University 8. REFERENCES. [1] S. Sito, J. Oht, nd M. Fujing, JIP Iron Powder Produts nd Tehnil Trends in Powder Metllurgy, jfesteel.o.jp, vol. 16, no. 16, [2] A. Kurjk, The vertil srew onveyor- powder properties nd Srew onveyor design (Mster Thesis), Lund Institute of Tehnology, [3] S. Shmolke, A. Ktterfeld, nd F. Kruse, Experimentl Tests nd Design of Tue Chin Conveyors, wse.urz.unimgdeurg.de. [4] D. Mills, M. G. Jones, nd V. K. Agrwl, Hndook of Pneumti Conveying Engineering. Mrel Dekker, [5] V. Mironov, J. Vi, nd V. Lpkovsky, Eletromgneti trnsporttion of ferromgneti powders in pipes /in Russin/, Poroshkovy metllurgiy, vol. 33, pp , [6] V. Lpkovskis nd V. Mironovs, Lortory equipment EMC-05. Introdution to onveying of ferromgneti powders y impulsed eletromgneti field [7] HBS, HBS CD 1501 Power Unit. Operting mnul. 2005, p. 72. [8] K. B. Bltzis, The FEMM Pkge: A Simple, Fst, nd Aurte Open Soure Eletromgneti Tool in Siene nd Engineering, J. of Engineering Siene And Tehnology Rev., pp , [9] S. Zurek, Mgneti ore with oil. 2D mgnetostti with FEMM 4.2, [10] D. Meeker, Finite element Method Mgnetis v4.0, User s Mnul [11] S. W. Kim, H. K. Jung, nd S. Y. Hhn, An optiml design of pitordriven oilgun, Mgnetis, IEEE Trnstions on, vol. 30, no. 2, pp , [12] G. W. Slde, A simple unified physil model for relutne elertor, Mgnetis, IEEE Trnstions on, vol. 41, no. 11, pp , Nov [13] D. J. Griffiths, Introdution to eletrodynmis, vol. 3. prentie Hll New Jersey:, [14] R. Ieruslimshy, L. H. de Figueiredo, nd W. Celes, Lu 5.1 Referene Mnul. Lu. org, 2006, pp [15] V. Lpkovsky, V. Mironov, A. Shishkin, nd V. Zemhenkov, Conveying of Ferromgneti Powder Mterils y Pulsed Eletromgneti Field, in Euro PM2011 Tools for Improving PM: Modelling & Proess Control, 2011, pp [16] V. Mironovs, V. Lpkovskis, nd J. Broniņš, Method nd devie for mixing of powder mterils, LR Ptent pplition A,