共查询到19条相似文献,搜索用时 109 毫秒
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动磁式直线压缩机电磁特性分析及实验 总被引:1,自引:0,他引:1
设计开发了一种动磁式直线压缩机样机,利用磁路分析法对直线压缩机的静态特性进行定性分析,得到了电磁力、磁链关于电流、位移以及直线振荡电机结构参数之间的函数关系.又利用电磁场的二维有限元参数化分析进行定量分析,精确计算了不同位置和电流下的电磁力和磁链.修正了磁路分析的计算结果.为研究其动态特性,将有限元静态分析与状态方程法相结合,建立了动力学模型,并利用4阶Runge-Kutta法求解状态方程.实验证明,此动态特性仿真方法是有效的,样机的性能能够满足冰箱压缩机的前求. 相似文献
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脉管制冷机是目前最常用的小型低温制冷机之一,直线电机驱动的线性压缩机是脉管制冷机的关键部件。介绍了应用于脉管制冷机的直线电机的两种主要类型,其中包括动圈式和动磁式直线电机的多种结构形式以及各形式的特点,对直线电机的设计、监测和运行三个方面进行了综述,指出了今后脉管制冷机用直线电机的发展趋势,为该领域的科研工作者提供参考。 相似文献
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2019年中国大学生物理学术竞赛中,非铁磁性导体材料制的陀螺仪在磁场中减速问题的研究没有限定任何具体参数,不易根据麦克斯韦方程得到全面统一的答案.本文从无限长导体圆柱模型入手,通过合理的近似,推导得到了陀螺仪转轴与磁场方向垂直和平行两种条件下,电磁阻力矩与磁感应强度、角速度、电导率等参数依赖关系的表达式,进而给出了磁场方向相对陀螺仪转轴任意取向时陀螺仪减速阻尼系数满足的一般关系,并通过量纲分析验证了公式的合理性.实验部分设计引入直流电动机提供驱动转矩,分析测量数据可以证明,基于基本模型得到的电磁阻力矩公式可以较为准确的描述实际的陀螺仪减速过程. 相似文献
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直线电机是一种无需中间传动装置而直接将电磁力转换为线性运动的特种电机,在交通运输领域具有广泛的应用前景.将高温超导技术与电机理论相结合,能够有效利用超导材料的强载流能力与高场特性提高直线电机的输出能力.本文提出了一种应用于超导磁悬浮列车牵引的空芯高温超导直线电机,首先建立空芯高温超导直线电机的二维有限元模型对电机结构参数进行初步探索,并完成了超导直线电机样机的设计与制作.通过搭建实验测试平台完成了空芯高温超导直线电机定子磁场和电磁力的实验测试.有限元计算结果与实验数据有较好的一致性,验证了模型的有效性,并利用该模型研究了定子电流,超导线圈电流以及电机气隙对电机推进力输出的影响.本文的相关成果将促进超高速磁浮交通领域关键驱动技术的研究与发展. 相似文献
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Coupled magnetoelastic behaviour is investigated for two-phase composites containing randomly dispersed ferromagnetic particles under both magnetic and mechanical loading. The pair-wise particle interactions for magnetic field and elastic field are first defined by the solution for two particles embedded in the infinite domain, which is explicitly solved by the Green's function technique. By integrating the interactions from all other particles in the representative volume element, the homogenized magnetic and elastic fields are then obtained. Effective magnetostriction due to the magnetic interaction force is further derived. Without consideration of magnetic loading, this micromechanical model provides an effective elasticity with the pair-wise particle interactions. By dropping the interaction term, this model is reduced into Mori–Tanaka's model. Finally, magnetoelasticity is numerically solved by considering the magnetomechanical coupling effect. It is predicted that the effective Young's modulus and shear modulus decrease along with the increase of magnetic loading for random composites. 相似文献
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R. D. Firouz-Abadi & H. Mohammadkhani 《advances in applied mathematics and mechanics.》2014,6(3):299-306
This paper aims at investigating the resonance frequencies and stability of a long
Graphene Nano-Ribbon (GNR) carrying electric current. The governing equation of
motion is obtained based on the Euler-Bernoulli beam model along with Hamilton's
principle. The transverse force distribution on the GNR due to the interaction of
the electric current with its own magnetic field is determined by the Biot-Savart
and Lorentz force laws.
Using Galerkin's method, the governing equation is solved and the effect of current
strength and dimensions of the GNR on the stability and resonance frequencies are investigated. 相似文献
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在国家基金项目的支持下,本研究基于电子论和洛伦兹磁力否定法拉第定律和相对论电磁学,暨揭示广义洛伦兹磁力的科学研究之三:旋度电场和协变场不存在.文[1]介绍了广义洛伦兹磁力的定义及其及其证明,并论证指出广义洛伦兹磁力是真谛;文[2-3]介绍了法拉第电动势ε是虚构的,虚构的法拉第定律存在几个关键问题.正因如此,所以法拉第定律不具有普适性.感应电流的产生与磁通量变化率无关. 相似文献
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A novel linear ultrasonic motor based on in-plane longitudinal and bending mode vibration is presented in this paper. The stator of the motor is composed of a metal plate and eight piezoelectric ceramic patches. There are four long holes in the plate, designed for consideration of the longitudinal and bending mode coupling. The corresponding model is developed to optimize the mechanical and electrical coupling of the stator, which causes an ellipse motion at the contact tip of the stator when the composite vibrations with longitudinal and bending are excited. Its harmonic and transient responses are simulated and inspected. A prototype based on the model is fabricated and used to conduct experiments. Results show that the amplitude of the stator’s contact tips is significantly increased, which helps to amplify the driving force and speed of the motor. It is therefore feasible to implement effective linear movement using the developed prototype. 相似文献
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J.C. Slonczewski 《Journal of magnetism and magnetic materials》1979,12(2):108-122
The following general relations involving force, momentum and topological winding number of a translating magnetic domain are derived from the Landau—Lifshifz equation in a context appropriate to bubbles: The gyrotropic force tending to deflect a steadily moving domain is proportional to a mean winding number linear in Bloch-point coordinates. The time derivative of the canonical momentum for a domain of integer winding number is equal to the total force, which must include gyrotropic and dissipative terms. A new contour integral expresses the momentum in the limit of vanishing wall thickness. Approximate equations of quasi-steady domain motion are cast into a form resembling Hamiltion's equations for a particle. Discussion centers on applications to gradientless propagation, bubble saturation velocity, and the Blochline model of inertial effects, and on general limitations of the theory. 相似文献