磁力联轴器高速磁力传动及液磁相干研究

发布时间：2018-03-24 02:06

本文选题：磁力联轴器　切入点：“湿”态　出处：《江苏大学》2017年硕士论文

【摘要】：磁力泵因其无泄漏特性广泛用于制药、航空航天等领域。磁力泵高速化可以提高泵效率,减小泵体积。磁力联轴器作为磁力泵的核心部件,高转速下磁力联轴器“湿”式涡流损失、磁场分布、液磁相干特性尚不清楚。本课题以圆筒式径向充磁的磁力联轴器为研究对象,开展高速磁力传动液磁相干特性研究,对于提高高速磁力泵的效率和稳定性具有重要的工程意义,对于高速磁力传动理论具有重要的学术价值。本文的主要工作和研究成果如下:1.较为系统的总结了磁力联轴器国内外研究的发展历程,建立了圆筒形径向充磁的磁力联轴器模型,对比分析了静磁场及瞬态磁场,进而得出感应磁场的分布。圆筒式径向充磁的磁力联轴器起主要作用的是磁场径向分量,因此重点分析了转速对磁场径向分量的影响。结果表明:随着转速的增加,感应磁场增强,对原磁场的削弱程度增强,而且转速越高,磁场下降越快,10000rpm时下降最多,为1.7%。2.建立了圆筒形径向充磁磁力联轴器扭矩计算的解析模型,并采用有限元法仿真,分析了在不忽略感应磁场的情况的扭矩特性,以及转差角、转速对传递扭矩的影响规律。得知:(1)传递扭矩随着转差角的增加而增加,在15°(180°/n,n为磁极数,本研究中n为12)时达到最大,这与不考虑感应磁场时的变化规律相同;(2)随着转速增加,传递扭矩近似线性下降,并且转差角越小,转速对扭矩的影响越大。3.设计磁场发生装置,并配置不同质量浓度的NaCl溶液,实验探究不同强度磁场对导电液体的粘度及电导率的影响规律,具有创新性。实验获知:(1)随着磁场增强,溶液电导率增加,但并非严格意义上的持续增加,增加到一定程度后甚至出现下降趋势;(2)外加磁场对NaCl溶液和去离子水的粘度确有影响,随着外加磁场的增强,粘度值变大,之后趋于稳定;(3)溶液中粒子越多,粘度值受磁场影响越明显。4.建立“湿”态磁力联轴器模型,分析计算了不同电导率的输送介质及不同材质的隔离套产生的涡流损失。在此基础上探究了转速、输送介质电导率、隔离套材质、磁极对数、隔离套厚度对涡流损失的影响规律,并提出了5种减少涡流损失的方法。得知:(1)随着溶液电导率的增加涡流损失逐渐增加;(2)隔离套材质不同,涡流损失也不相同,电导率越高,涡流损失越大,材质为1Cr18Ni9Ti时产生的涡流损失约为TC4的2倍;(3)涡流损失随着转速的升高先增加后减小,存在极大值和极小值,在4000rpm附近达到最大值,8000rpm附近达到最小值,8000rpm时隔离套产生的涡流损失比4000rpm时的涡流损失减小82.43%;(4)转速不同,磁极数与涡流损失的关系略有不同,转速在1000rpm~7000rpm时,涡流损失随着磁极数的增加存在极大值和极小值:磁极数为8时涡流损失最大,磁极数为12时涡流损失最小。转速在7000rpm~10000rpm时,涡流损失随着磁极数的增加存在极小值,12级时涡流损失最小。另外,随着磁极数的增加,涡流损失的极值具有向转速小的方向移动的趋势;(5)隔离套越厚,其产生的涡流损失越大。不同厚度的隔离套,转速对涡流损失的影响规律一致,即在4000rpm附近达到最大值,8000rpm附近达到最小值。5.设计并搭建了高速磁力传动试验台,为后续试验探究磁力联轴器高速磁力传动性能奠定基础。
[Abstract]:Magnetic pump because of its no leakage characteristics are widely used in pharmaceutical, aerospace and other fields. High speed magnetic pump can improve the pump efficiency, reduce the pump volume. As a core component of magnetic coupling of magnetic pump, high speed magnetic coupling "wet" type eddy current loss, magnetic field distribution, magnetic fluid coherence is not clear. In this paper the magnetic coupling of cylindrical radial magnetization as the research object, and carry out the high-speed magnetic drive liquid magnetic coherence research, for it has important engineering significance to improve the efficiency and stability of high speed magnetic pump, which has important academic value for the high-speed magnetic drive theory. The main work and research results are as follows: 1. systematically summarized the development process the magnetic coupling research at home and abroad, establishes a model of magnetic coupling of cylindrical radial magnetizing, comparative analysis of the static magnetic field and transient magnetic field, leading to the induction The distribution of the magnetic field. The magnetic coupling of cylindrical radial magnetizing played a major role in the radial component of the magnetic field, so focus on the analysis of the effect of rotational speed on the radial component of the magnetic field. The results show that with the increase of rotational speed, magnetic field enhancement, enhancement of the level of weakening the original magnetic field, and the higher the speed, the magnetic field decreased more quickly, 10000rpm when the largest decline, an analytical model of calculating radial magnetization magnetic coupling torque is 1.7%.2., and the finite element method simulation, analysis of the torque characteristics in neglect induced magnetic field conditions, and the slip angle, speed on the influence of torque transmission. That: (1) torque increases with increasing slip angle, at 15 degrees (180 degrees /n, n is the number of poles, in this study, n 12) the maximum, which is consistent with the change rule of not considering induction magnetic field; (2) increase with the speed, torque transmission under linear approximation Drop and slip angle is small, the greater the effect of rotational speed on the torque.3. design of magnetic field generating device, and configure the NaCl solution of different concentration, the law to explore the impact of different intensity of magnetic field on the viscosity and conductivity of conducting liquid, innovative experiment. That: (1) with the increase of the magnetic field, the conductivity increased, but not strictly increasing, increased to a certain extent even decline; (2) the viscosity is the influence of magnetic field on NaCl solution and deionized water, with increasing the magnetic field, the viscosity value becomes large, then tends to be stable; (3) more particles in solution viscosity affected by magnetic fields the more obvious.4. to establish a "wet" state magnetic coupling model, analysis and calculation of the transmission medium with different conductivities and different material isolation sets generated eddy current losses. On the basis of the inquiry speed, transmission medium conductivity, vibration From the set of material, magnetic pole logarithm, influence of isolated sets of thickness on the eddy current loss, and puts forward 5 methods to reduce the eddy current loss. That: (1) with the increase of eddy current loss of solution conductivity gradually increased; (2) isolated sets of different materials, the eddy current loss is not the same, the higher the conductivity, eddy current loss is large eddy current loss of material for the 1Cr18Ni9Ti generated is about 2 times of TC4; (3) the eddy current loss with the increase of speed increased first and then decreased, the maximum value and the minimum value reached the maximum in the vicinity of 4000rpm, near 8000rpm, reaches a minimum, 8000rpm isolation sets generated eddy loss than the eddy current loss of 4000rpm the decrease of 82.43%; (4) the relationship between the number of poles and different speeds, the eddy current loss is slightly different, the speed in the 1000rpm~7000rpm, the eddy current loss with maximum and minimum values are increasing the number of poles of the magnetic pole number of eddy current loss of 8 maximum number of poles. To minimize the eddy current loss of 12. The speed at 7000rpm~10000rpm, eddy current loss minima with increasing the number of poles, the minimum eddy current loss at level 12. In addition, with the increase of the number of poles, the eddy current loss has moved to the extreme speed in the direction of the trend; (5) the isolation sleeve is thicker, the eddy current loss the more isolated sets of different thickness, consistent effect of rotational speed on the eddy current loss, which reached the maximum in the vicinity of 4000rpm, near 8000rpm, reaches a minimum value of.5. was designed and built in high-speed magnetic drive test bench, lay the foundation for the subsequent performance of high-speed magnetic drive coupling experiments on the magnetic force.

【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH38

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