Y. C. hi, J. Y. Yen
Dcpannlcnt of Mmhsnical Eogineerisg. Nalional Taiwan Univerriiy. Taipci, Taiwan. Rcpublif of Chinii
Abstract
This article brings up a new design of a singlc-deck planar inotion maglev system. The proposed system differs f i O m the conventional double-deck system by not using lineal- maglev slideways. I t i s also simpler in the construclion compared to the other singlc-deck planar maglev systems
I1
1121131. The new planar maglev system is consisted of an array of solenoid electromagnets arid a permanent magnet carrier srage. The system uses the excited solennids to drive and to position the permanent magnet carrier (Figure I i? a conceptual draw of the novel single-deck planar maglev system). The analysis in thi5 research i s based on the A N S O m finite element analysis sothaw that is employed to simulate and to analyz electromagnetic effects between permanent magnels and solenoids. According to the results rrom Ihe two-dimensional and three-dimensional simulations. this paper analyzed the effects o f solenoid forces on the carrier milgnet. The different magnet dimensions and different solenoid arrangements result in slightly different force variations. With the ahility to calculate the force distribution history. the paper then study the effects of various solenoid excitation manners. This research will nmve on to huild a prototype model for experimental verification.The goal o f the analysis i s to reach n configuration Ilia1 can provide restoring forces lo holh the litcral and thc Icvitating dircctions. Thc scales o f thc cylindrical snlcnoids in rhc systcin arc 2 0 " in outside diameter,
I O "
in inside diameter. l0mm in height and 370 iurns passing I A current. The permanent magnet i s NdFeB. The rcmanence i s 1.29T. the coercivity is 990KMm. at(I)
the diameter is IO", at (11) the length is 20-60" and the height is 3mm the same.(I)
Design of the circular magnet-The 3D mimic kamework of the circular magnet and the solenoid is shown in figure 2. Figure 3 presents the Simulation results o f the horizontal circular magnet. Figure 4 prescnts the simulation results of a vertical circulm magnet. To integrate the electromagnetic effects between a circular magnet and a solenoid, one can use a basic planar maglev plallorm as in figure 5.(11) Design of the recrangular mdgnet-There are five of designs considered and the gap is Imm. The trial is carried out by exciting S solenoids with f l A to produce SSNSS magnetic field. The
2D
mimic framework i s shown in figure 6 and the results are presented in figure 7. I t is observed that the clamping force(Fx)
and the huoyancy force (Fy) from 40" and 60" carriers carries the desire stability. With these configurations. one can then dixcuss the stability of the carrier and analyTe the required solenoid excifation pattern. One would expect the 3D simulation to yield similar results as the 2D simulation. I n the 3D simulation. a square illagnet carrier and cylindricalsolenoids are uicd. I t is observed that: a. From Ihe 1ewI1 uflhe 40mm siinuliilivn. one discovers tliar wine I+ are stronger than the required weight 01 the carrier (0.762hN). b. 'The reytoring fwcc c ~ n bc calablishcd. c. Thc 60mm sirniilillion rcsulls arc similar 10 lhc 40mm sinlul~lion. Some 3D simulation rcsuhs are shown in figurc 8 (40mm).
Canclusivns
This rcicarch ulilixb clccimmagnclic siniulalivn IO bring up a worksblc dcsign u f a ~novcl. long- mngc. single-deck p k m s maglev system. Using the combination of circular and recVangu1;s magnets, it is possible to dcrive workable excitation patterns with a symmetrical solcnoids array. 'The results arc equally applicable 10 the small-range motions.
References
Ill Aly F. Flores Pilho, Altnmiro A. Susin ond Marilia A. da Silvcira, "Applic:tIion of
Ncodymium-Iron~Bomn Pcnnanent Mttgnels nn the Acsemhling of it Novel Plmw Aclu;ilol-." IEEETNuL on Magnetic\. Vol. 35. No. 5 . pp.4034-403(,. Sep. I!W!J.
L2I Chu. H.S.. Im. C.H. and Jung H.K., "Miignctic Ficld Analysis of 2-D Pcrmencnt Magnct Array for Pl;mar Motor." IEEE Trim. on Magnetics. Vol. 37. No. 5. pp.3762-3766. Ssp. 2001,
131 Trumpcr. D.L.. Olson, S.M. and Subrahinanyan, P.K.. "Linearizing Contrvl ul Magnetic Suspension Systcms," [EBB Tmn. on Contml Systems Technology,
Vol.
5, No. 4, pp.427-438,July 1997 Fi ..2
