磁體工作狀態(tài)判斷標(biāo)準(zhǔn)的改進(jìn)
AN IMPROVED CRITERION TO JUDGE THE ENERGY CONTRIBUTION OF MAGNETS
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摘要: 磁體結(jié)構(gòu)優(yōu)化設(shè)計(jì)需要用最少量的磁體產(chǎn)生最強(qiáng)的磁場(chǎng),其要點(diǎn)之一是保證磁體的每一部分工作在退磁曲線上盡量靠近最大磁能積(BH)max的地方,目前用于磁場(chǎng)計(jì)算的程序CTA對(duì)磁體工作點(diǎn)的算法有缺陷,它對(duì)一個(gè)形狀復(fù)雜磁體結(jié)構(gòu)的磁場(chǎng)能量貢獻(xiàn)大小的計(jì)算也不能給出唯一的結(jié)果,以便當(dāng)作設(shè)計(jì)優(yōu)劣的判據(jù)。作者就程序算法進(jìn)行改進(jìn)后,對(duì)每個(gè)磁體結(jié)構(gòu)給出一個(gè)統(tǒng)一的平均磁能積作為判斷磁體工作狀態(tài)的標(biāo)準(zhǔn),并進(jìn)一步畫(huà)出了磁能積的分布圖。
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關(guān)鍵詞:
- 磁體工作點(diǎn); 平均磁能積; 磁能積分布
Abstract: The optimum design of magnet structures requires that every part of the magnets work at a point on the demagnetization curve which is as near to (BH)max as possible. CTA is a program for the computation of magnetic fields in axisymmetric systems. It has some defects in its search for magnet working points, and furthermore, for a complex structure it cannot provide a sole result to judge how much magnetic energy is contributed by the magnets. In this paper the authors introduce average magnetic energy product to serve as a criterion for the judgment of the work state of magnets. For every magnet structure the improved CTA can present a unique average magnetic energy product and a map of the energy product distribution. -
J.H. Jensen, Optimization method for permanent-magnet structures, IEEE Trans. on Magnetics,1999, 35(6), 4465-4472.[2]J.H. Jensen, M. G. Abele, Maxinally efficient permanent magnet structures, J. Appl. Phys.,1996, 79(2), 1157-1163.[3]K.R. Davey, Magnet design optimization using variable metrics, IEEE Trans. on Magnetics,1995, 31(6), 3566-3568.[4]F. Bloch, O. Cugat, Innovating approaches to the generation of intense magnetic fields: design and optimization of a 4 Tesla permanent magnet flux source, IEEE Trans. on Magnetics, 1998,34(5), 2465-2468.[5]Xie Dexin, et al., Shape design optimization in non-linear magnetic problems using simulated annealing with complex strategy, IEEE Trans. on Magnetics, 1995, 31(6), 3569-3571.[6]Wu Xunlei, et al., Calculation of nonlinear magnetic fields in cylindrically symmetric system.[7]周壽增,董清飛著,超強(qiáng)永磁體,北京,冶金工業(yè)出版社,1999年,63-68. -
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