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钕-铁-硼永磁材料的性能优于所有传统永磁体材料,它可使仪器仪表电子设备的元器件微型化,具有广阔的发展前景。钕-铁-硼永磁材料比较昂贵,为节约原材料,加工时应尽可能减小去除量,尤其是进行孔加工时,应采用套孔加工,芯柱可留作他用。用套料刀具在实心材料上环形切割称为套孔加工,套孔与钻孔相比不仅能减少轴向载荷,提高生产效率,而且能减少材料的损耗。用金刚石工具加工钕-铁-硼永磁材料是一种十分有效的加工方法。刀具结构如图所示。刀头上电镀金刚石并开有4个槽,在套孔时整个刀具的端面都参与切削,轴向抗力与工具的轴… 相似文献
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一种简便、用三步骤工艺就能制造的永久磁铁,其磁性之强可与快速凝固钕-铁-硼粉末烧结磁铁相媲美。该新工艺包括:浇铸、热压和回火,使得镨取代另一种稀土钕为可能,在该合金组分中,还包括1.5%的铜,以及铁和硼。由日本第一流的磁性材料专家Dr.T.Shimoda领导的研究小组在日本研究和发展中心开发了该材料,由于可 相似文献
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本文介绍了一种铁基粉末冶金零件渗硼新工艺。该工艺的特点是把烧结和渗硼两个工序合井为一个工序,利用烧结过程的热能同时完成烧结和渗棚。通过渗层组织分析及性能测定,一体化工艺能获得厚度大、性能好的Fe_2B单相渗硼层,是一项有发展前途的新技术。 相似文献
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本文主要介绍用还原铁粉制造的烧结铁软磁材料和铁-碳,铁-碳-铜以及用混合法加入合金元素的烧结钢材料的性能,并介绍目前正在发展的用雾化法制遣的预合金钢粉和粉末热锻材料的性能。对这些材料举例说明其应用情况和技术经济效果,供设计人员参考。 相似文献
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在简化磁体模型的基础上,研究了两个同心永磁环构成的径向永磁轴承在轴向偏移时磁力和刚度的计算方法,通过提高永磁轴承刚度的方法导出径向永磁轴承最优结构尺寸.从理论上阐述了在设计过程中如何确定径向永磁轴承的高度及截面尺寸,达到节省永磁材料、减小轴承尺寸的目的. 相似文献
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N. WATANABE H. UMEMOTO M. ISHIMARU M. ITAKURA M. NISHIDA & K. MACHIDA† 《Journal of microscopy》2009,236(2):104-108
Behaviours of constituent elements in the Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption have been investigated by using an analytical transmission microscopy. It was found that a triple junction of the grain boundaries consists of fine Nd-O crystalline and amorphous phase. The energy dispersive X-ray spectroscopy (EDS) analysis showed that the amorphous phase mainly consists of Co, Nd and Tb. The Tb-treatment causes the formation of the amorphous Co-Nd(Tb) wetting-layer phase which wraps each Nd2 Fe14 B grain. The results suggest that the wrapped structure prevents the nucleation of magnetic reversed domains and then improves significantly the coercivity of the magnet. 相似文献
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Nd-Fe-B烧结永磁材料的车削加工研究 总被引:1,自引:0,他引:1
对Nd-Fe-B烧结永磁材料的车削加工进行了试验研究。用线性断裂力学的方法建立了硬脆材料车削加工时的材料去除模型。探讨了车削过程中背吃刀量、进给量和车削速度对车削力及加工表面质量的影响,采用多元回归分析方法得出了主车削力的经验公式,并给出了用于检验回归结果与试验结果符合程度的误差评判参数。分析了Nd-Fe-B烧结永磁材料车削过程中刀具的磨损状况,以及刀具几何参数对加工质量的影响。 相似文献
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The power characteristics of highly coercive permanent magnets (barium-oxide and rare-earth alloy magnets) used in magnetic clutches are compared. By using different permanent magnets, clutches of the same size that produce different torques may be obtained. 相似文献
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The force exerted by highly coercive permanent magnets (made from alloys of rare-earth metals) used as rectangular prisms
in magnetic systems is considered. Calculation results and experimental data for magnets grouped on the basis of the residual
induction are compared. The influence of the distance between adjacent magnets in the system on the force between the highly
coercive permanent magnets is demonstrated. 相似文献
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飞轮储能磁轴承系统结构及其悬浮特性 总被引:1,自引:2,他引:1
介绍了一种由径向永磁轴承与电磁推力轴承组成的单轴主动控制的飞轮储能磁轴承系统结构 ,径向永磁轴承提供径向恢复力与轴向悬浮力 ,电磁推力轴承提供轴向恢复力。并对系统的结构参数计算及其磁悬浮特性进行了分析与讨论。研究结果表明 ,永磁轴承动、静磁环轴向位移对系统承载力与刚度有明显影响 ,采用多对磁环永磁轴承 ,有利于提高系统承载力与径向刚度 相似文献
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螺旋桨重力会导致船舶推进轴系发生挠曲,造成艉轴承边缘润滑状态恶劣。采用一种磁水复合支撑形式的艉轴承,通过引入永磁体磁力作用,改善桨重因素对艉轴承边缘润滑状态的不利影响;构建永磁体三维磁力特性分析方法,探究不同永磁体材料磁性质和布置形式对磁力承载性能的影响规律;基于艉轴承弹性流体动压润滑分析方法,获取永磁体形性特征对润滑特性的影响规律。结果表明:磁承载力受永磁体材料剩磁的影响明显,材料剩磁越大,永磁体承载力越大,轴承润滑状态相对越好;沿周向增加磁块数目或增加永磁块轴向长度可以增大永磁体的承载力,但永磁体承载效率可能下降,设计时需综合考虑;磁体的布置形式也对磁力承载性能和润滑性能影响显著,在永磁体体积相同的情况下,更为合理的布置形式可使永磁体承载力与艉轴承最小水膜厚度明显增大。 相似文献
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A method to characterize permanent and fast-pulsed iron-dominated magnets with small apertures is presented. The harmonic coil measurement technique is enhanced specifically for small-aperture magnets by (1) in situ calibration, for facing search-coil production inaccuracy, (2) rotating the magnet around its axis, for correcting systematic effects, and (3) measuring magnetic fluxes by stationary coils at different angular positions for measuring fast pulsed magnets. This method allows a quadrupole magnet for particle accelerators to be characterized completely, by assessing multipole field components, magnetic axis position, and field direction. In this paper, initially the metrological problems arising from testing small-aperture magnets are highlighted. Then, the basic ideas of the proposed method and the architecture of the corresponding measurement system are illustrated. Finally, experimental validation results are shown for small-aperture permanent and fast-ramped quadrupole magnets for the new linear accelerator Linac4 at CERN (European Organization for Nuclear Research). 相似文献
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背向串联式磁性液体密封的聚磁结构中有多个永磁环和极靴环交替相间排列,且相邻永磁环的极性彼此相反。采用ANSYS有限元软件对背向串联式磁性液体密封聚磁结构特性进行数值分析,分析永磁环厚度、极靴环厚度、密封间隙大小以及叠层环径向宽度等结构参数对密封间隙路径上的磁通密度分布特性的影响。结果表明,背向串联式磁性液体密封聚磁结构可以在相对有限的结构空间内,在其密封间隙路径上较好地形成强弱相间的周期性变化磁通密度分布;但是密封间隙路径上周期性出现的弱磁场区域内存在局部强磁场,不利于提高密封性能和结构紧凑性。 相似文献
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V. E. Vavilov 《Russian Engineering Research》2018,38(4):256-259
The selection of the optimal magnetic system for a quadrupole electromechanical energy converter with highly coercive permanent magnets is considered, in the case of nonsteady operation in generator mode. The type of magnetic system corresponding to different optimality criteria is identified. The eddy-current losses in the highly coercive permanent magnets are analyzed. 相似文献
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Sh. M. Aliev I. K. Kamilov M. Sh. Aliev A. G. Gamzatov J. G. Ibaev 《Instruments and Experimental Techniques》2011,54(6):828-830
A Mössbauer-spectroscopy method for determining the texture scattering angle and the relative remanent magnetization of anisotropic permanent magnets is described. The method has been experimentally verified on powder-based permanent magnets made of barium ferrite BaFe12O19. 相似文献