共查询到19条相似文献,搜索用时 156 毫秒
1.
2.
日本名古屋大学教授福田敏男和新井史人等开展了超磁致伸缩元件的研究工作,他们利用稀土类磁性材料的磁致伸缩特性,在室温下获得形变量大10~(-3)量级的结果.如果改变磁场,磁体就会产生形变的磁性材料称之为磁致伸缩材料,虽然磁致伸缩元件形变位移量很小,但是,由于外部的交流产生磁场变化,因此可用非接触方式使元件产生形变位移动,具有不用导线来作驱动的工作特点,磁致伸缩效应较大的超磁致伸缩元件产生形变位移,过去开发试制若干管内移动机器人可用于管内检查、修理工作,但是,为了使致动器驱动,电源供电缆处理成为问题,而超磁致伸缩驱动器不需要电缆,其形状适宜可做 相似文献
3.
超磁致伸缩材料及其应用 总被引:4,自引:0,他引:4
介绍了超磁致伸缩材料具有高磁致伸缩应变λ,能量转换效率高、工作频带宽、频率特性好;稳定性好、可靠性高,其磁致伸缩性能不随时间而变化,无过热失效等特点;开发出的TbxDyt(1-x)Fe,合金,在较低的外磁场下就能达到超磁致伸缩效果,并对TbFez,DyFe2,Tb0.3Dy0.7Fe2(Terfenol-D)做了特性对比;超磁致伸缩材料在声频和超声技术方面广阔的应用前景,超磁致伸缩材料的应用及研究对发展声纳技术、水声对抗技术、海洋开发与探测技术将起到关键性作用。 相似文献
4.
磁致伸缩材料是构成压力、温度、湿度以及液体黏度和密度等多种传感器的关键材料,材料本身的测量技术对其应用拓展至关重要。介绍了基于单片机的磁致伸缩系数测量系统的开发状况,并设计了一款磁致伸缩材料共振频率的测量系统,该系统对于磁弹性传感器的开发与应用具有实用意义。 相似文献
5.
6.
7.
8.
9.
磁致伸缩效应光纤微分干涉电流传感器 总被引:6,自引:3,他引:3
基于磁致伸缩效应,利用微分干涉仪,设计了一种光纤电流传感器,可用于高精度,高灵敏度电流和磁场的测量,分析了用磁致伸缩效应实现光纤电流传感器的原理,建立了基于磁致伸缩效应传感头的数学模型,并通过实验对光纤电流传感器的输入-输出特性,直流偏置特性和精确度等进行了研究,在8-200A的电流测量范围内,测量比差约为0.5%。 相似文献
10.
从传统压力传感器结构和超磁致伸缩材料逆效应原理入手,通过对闭合磁路和偏置磁场的研究,设计出一种新型的超磁致伸缩压力传感器,通过结构内部的霍尔传感器测量磁通量实现静态力的测量。利用Comsol软件进行有限元仿真,重点研究闭合磁路对磁通量的影响以及偏置磁场对传感器输出特性的影响规律。仿真结果表明:当采用闭合磁路装置时,能够对磁通进行引导,几乎没有漏磁通现象;存在一个最佳偏置电流(偏置磁场)使得传感器的灵敏度最高,求得灵敏度为0.44 mV/N。这为后面超磁致伸缩逆效应压力传感器的深入研究提供了一种技术途径。 相似文献
11.
《Mechatronics》2002,12(4):525-542
A hybrid linear motor that produces precise resolution with long travelling distance under inchworm motion principle is developed. The motor consists of one push and two clamping devices. The clamping device is innovated using multistack piezoelectric actuators with displacement amplifier since the displacement generated from multistack actuator is not enough for clamping. To secure the large push load and displacement, Terfenol-D magnetostrictive material is used for the push device. Design process of the push and clamping devices is conducted to meet the performance of the motor. The clamping and push devices are assembled and a control sequence is applied. The performance of the inchworm motor is tested in terms of speed and force. The moving speed is increasing when the input frequency and current are increased. To make the performance stable, time tuning between the push and clamping devices signals is necessary. Some remarks on improving the performance of the motor are addressed. 相似文献
12.
H. Kanebako Y. Okada 《Mechatronics, IEEE/ASME Transactions on》2003,8(1):111-119
A new structure of hybrid (HB)-type self-bearing motor is proposed for miniature spindle motors. The proposed design combines the HB-type self-bearing motor and HB active magnetic bearing in the common stator and rotor pair to generate large radial forces. First, the principle and theoretical background are introduced. Then, the air gap flux is analyzed by the finite element method, and radial forces for the proposed and standard-type HB self-bearing motors are compared. Finally, experiments are conducted to confirm the performance of the proposed motor. The motor can run at relatively high rotating speed with relatively high torque compared with its small size. The levitation is very stable and the motor indicates good performance for practical application. 相似文献
13.
《Mechatronics, IEEE/ASME Transactions on》2009,14(1):82-92
14.
15.
简述了近十年来直线超声马达的研究进展,分析了超声马达在结构设计和摩擦驱动等方面的关键问题。分析表明,开发新型原理的超声马达方兴未艾,但接触型马达为目前直线马达的主要发展方向。本体结构简化、驱动性能增强、工作效率及稳定性提高,是超声马达结构设计时应考虑的目标和任务。但接触型直线马达正常工作过程就是定/动子间的高频冲击磨损过程,定动子间摩擦学设计至关重要。另外,装配预紧力、接触间隙和磨损过程等引起的非线性问题,在马达设计制造和使用维护中应给予关注。最后,探讨了马达使用性能及运行寿命的影响因素,并总结了直线超声马达工作过程中的能量损失缘由和噪声产生机理。 相似文献
16.
The history of linear motors is a history of shape. Once having departed from the cylindrical geometry of rotating machines, a wider world of three-dimensional design becomes possible. Linear induction motors dominate the field of linear drives to the same extent as does the rotary induction machine in relation to more complicated adjustable-speed motors. It is therefore thought appropriate to devote only one section to linear motors other than induction. A fairly full treatment of electromagnetic levitation is also included together with a treatment of oscillating machines. Perhaps the most important features are the division of electrical machines into two classes which are termed "magnetic" and "electromagnetic" and the "topological explosion" which is at present taking place in linear motor design. Some linear machines are already well established on a commercial basis but the vast bulk of recent inventions still remain to be exploited. 相似文献
17.
为了提高TbDv-Fe膜的低场磁敏性,采用离子束溅射沉积(IBSD)法制备TbDy-Fe超磁致伸缩薄膜,分别研究了纯Fe膜与TbDy-Fe单层膜、TbDy-Fe/Fe耦合多层膜的复合及磁场下溅射沉积对TbDy-Fe膜磁致伸缩性能的影响;用振动样品磁强计(VSM)测试薄膜磁滞回线,用电容位移测量仪测试薄膜悬臂梁自由端偏转量,并计算出磁致伸缩系数λ.结果表明,由IBSD法制备的纯Fe膜、TbDy-Fe单层膜、TbDy-Fe/Fe复合膜的易磁化轴均平行于膜面,TbDy-Fe/Fe复合膜在低场下的磁化强度与磁导率均高于TbDy-Fe单层膜(在100 kA/m时,TbDy-Fe/Fe复合膜的磁化强度比TbDy-Fe单层膜高173%).纯Fe膜分别与TbDy-Fe单层膜、TbDy-Fe/Fe耦合多层膜进行复合均可提高薄膜磁致伸缩性能;磁场下溅射沉积所得180 nm纯Fe膜 640 nmTbDy-Fe/Fe耦合多层膜,由于在其膜面内短轴方向产生感生磁各向异性,从而使磁致伸缩性能得到进一步的提高,在150 kA/m的磁场下它的λ值可达到650×10-6. 相似文献
18.
Interaction of Trace Rare‐Earth Dopants and Nanoheterogeneities Induces Giant Magnetostriction in Fe‐Ga Alloys
下载免费PDF全文
![点击此处可从《Advanced functional materials》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Yangkun He Xiaoqin Ke Chengbao Jiang Naihua Miao Hui Wang John Michael David Coey Yunzhi Wang Huibin Xu 《Advanced functional materials》2018,28(20)
The discovery of a tenfold increase in magnetostriction of Fe by alloying nonmagnetic Ga was a breakthrough in magnetostrictive materials. The large magnetostriction is attributed to tetragonal nanoheterogeneities dispersed in the bcc matrix. A further remarkable fivefold increase is achieved by trace rare earth doping (<1 at%) up to a value of ≈1500 ppm, more than 50 times that of pure iron. However, it remains a mystery why trace rare earth dopants can induce such giant magnetostriction. Here, it is found that interaction of rare earth dopants with the nanoheterogeneities produces the giant magnetostriction, through a combination of experimental studies, first‐principles calculation and phase field simulations. The dopants tend to enter the nanoheterogeneities, increasing their distortion thereby creating a larger tetragonal distortion of the matrix as well as increased magnetocrystalline anisotropy. A mesoscopic model is developed using phase field simulation showing that the bulk tetragonal distortion arises mainly from those nanoheterogeneities with fixed Ga‐Ga pairs parallel to the applied magnetic field. Increased tetragonal distortion of the doped nanoheterogeneities leads to further distortion of the matrix. The results deepen the understanding of heterogeneous magnetostriction, and will guide the search for new magnetic materials with giant magnetostriction. 相似文献
19.
A new type of mechanism has been designed to move an output point through a motion akin to a swimmer’s breast-stroke. The mechanism is designed to clear loose debris from around small mobile search and rescue robots. However, it has potential applications in many other domains that require controllable cyclic motion. This paper describes the mechanism concept and presents mathematical analysis of its design parameters. The properties of the mechanism were examined to understand how the mechanism trajectory can be altered mid-cycle whilst maintaining the condition of continually rotating motors. Furthermore, equations to calculate the mechanism torque ratio were derived. The analysis reveals limitations in the trajectory variations that can be implemented whilst maintaining the condition of continually rotating motors. The mechanism was manufactured to validate the mathematical predictions. It was found that the predicted torque ratios are within 90% of the experimentally obtained torque output. The mechanism was controlled using proportional-derivative control (PD) and demonstrated to track several desired trajectories without reversing the direction of motor travel, with tracking error less than ±4 mm. 相似文献