共查询到17条相似文献,搜索用时 168 毫秒
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研究了一种由热解石墨转子、永磁体结构以及底板构成的抗磁悬浮结构,通过对石墨转子叶片施加氮气流使其运动.利用有限元软件COMSOL Multiphysics建立仿真模型,并且将仿真结果与实验结果相对比.研究表明,未受氮气流作用时,石墨转子仿真悬浮高度为130 μm,实验测得悬浮高度为132 μm,误差为1.5%;实验测得氮气流速小于21.45 sccm时,石墨转子在永磁体上方轻微摆动,而未转动,氮气流速达到21.45 sccm时,石墨转子转速稳定在120 r/min~130 r/min之间与仿真结果接近.通过对比仿真结果与试验数据得出石墨转子加工质量,实验环境对石墨转子的运动性能有一定影响,该抗磁悬浮结构有望用于微型电机和非接触式传感器中. 相似文献
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对抗磁悬浮振动能量采集器中悬浮永磁体的非线性振动特性进行了分析,并在此基础上分析了感应线圈结构参数对输出特性的影响.利用MATLAB软件的Simulink组件仿真分析采集器的非线性振动特性,利用有限元分析软件COMSOL对能量采集器的输出特性进行了仿真分析.通过改变线圈参数发现,在线圈体积一定时,输出功率变化很小,电压随着铜线直径减小增加很快,所以可以通过微细加工减小铜线直径的方法来提高线圈的输出电压.最终在线圈总体积约为6.4 mm3,铜线直径为0.02 mm,匝数为500匝时,得到的电压峰值达到约93.8 mV. 相似文献
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基于非线性技术改善能量采集器的能量采集效果作用,本文研究了非线性磁力耦合的双悬臂梁压电振动能量采集器,该采集器由两条不同的固有频率悬臂梁与永磁体组成.本文给出双梁磁力耦合压电能量采集器模型并建立了动力学方程式,通过实验测试获取相关参数与拟合磁力公式,数值仿真分析了双梁固有频率比1∶1.2与1∶1.5和永磁体初始间距40mm与30mm的4种结构能量采集器的电压输出性能与频率特征.根据数值分析设计实验:外激励加速度3m/s2作用下,双梁磁力结构能量采集器比单梁线性结构多一个电压共振峰;双梁固有频率比为1∶1.5比双梁固有频率比1∶1.2的电压响应带宽宽;初始磁距30mm共振峰值分别为(12Hz,39.4V)与(18Hz,13.4V)比初始磁距40mm两电压共振峰高且电压共振峰峰之间的电压输出比其他组合结构高. 相似文献
4.
一种振动自供能无线传感器的电源管理电路 总被引:2,自引:0,他引:2
针对振动能量采集器的输出功率过低不足以直接驱动无线传感器的问题,设计了振动自供能无线传感器的电源管理电路,根据调谐和阻抗变换原理对能量采集器进行了阻抗匹配,以最大功率对储能超级电容进行充电,对能量存储和电源管理电路的充放电特性进行了理论分析和实验验证。结果表明,该电路大幅度提高了采集器的输出功率和对储能超级电容充电的效率,当0.47 F超级电容电压达到0.6 V时,能量瞬间释放电路控制超级电容瞬间放电,成功驱动最大功耗为75 mW的无线传感器工作。 相似文献
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采用复合磁电换能器的振动能量采集器研究 总被引:1,自引:0,他引:1
采用Teffenol-D/PZT/Terfenol-D复合磁电换能器,设计了一种新型振动能量采集器.采集器由悬臂梁、磁电换能器和永磁体三部分组成,环境振动引起换能器与永磁体相对运动,使得作用到换能器的磁场变化,变化的磁场引起Tedenol-D产生应变,应变传递到PZT得到电输出.采用等效磁荷理论分析了影响换能器与永磁体相对运动的磁场力;并用林滋泰德-庞加莱法分析了永磁体的非线性运动情况.实验结果表明,在振动激励频率为33 Hz,加速度为0.5 gn时,输出电压峰峰值45.1 V,输出功率112.1μW. 相似文献
6.
针对刚性支撑压电振动能量采集器工作频带窄、采集效率低等问题,提出了一种基于弹性支撑与放大的宽频压电振动能量采集器.利用有限元方法建立了宽频压电振动能量采集器的机电耦合模型,通过Ansys软件仿真分析了能量采集器结构参数对其频域输出特性的影响;根据力学和电学平衡方法建立了宽频压电振动能量采集器的集总参数机电耦合运动微分方程,利用4-5阶龙格库塔算法对方程进行了时域求解,仿真分析了能量采集器在不同结构参数下的振动位移、速度、输出电压和功率等性能.研制了弹性支撑和放大的宽频压电振动能量采集器原理样机,建立了样机系统实验平台,并对理论研究结果进行了实验验证,结果表明本文所提的宽频压电振动能量采集器具有工作频带宽、输出性能高等优点,适合为微电子器件进行供电. 相似文献
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《工矿自动化》2021,47(7)
带式输送机自检托辊将无线传感器节点安装在托辊内部,用于采集并无线传输温度与振动信号,为煤矿带式输送机托辊健康检测提供了一种新的思路。针对密闭托辊内无线传感器节点的能量供给问题,设计了一种基于Halbach永磁体阵列的能量收集器。介绍了能量收集器的结构设计,根据无线传感器节点实际能耗及能量管理电路效率分析了供能需求;采用COMSOL Multiphysics 5.5对能量收集器进行有限元分析,验证了Halbach永磁体阵列用于小型旋转体能量收集器时较常规永磁体阵列具有明显优势,并分析了气隙厚度、永磁体厚度、转子速度对能量收集器发电性能的影响,得出通过减小气隙厚度、增大永磁体厚度、提高转子速度等方式可有效提高能量收集器感应电压的结论;基于能量收集器供能需求分析、安装空间要求及有限元分析结果,优化了能量收集器参数,并制作了样机进行试验,结果表明:在5r/s托辊转速下,能量收集器感应电压有效值为4.77V,最大功率为171.33mW,功率密度为6.78mW/cm~3,满足无线传感器节点能耗需求(165.722mW)。 相似文献
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为了揭示三稳态压电振动能量采集器非对称势能阱的产生机理及其对采集器动力学特性的影响机制,考虑采集器压电悬臂梁大扰度几何非线性和末端磁铁重力效应,利用能量法和Hamilton原理建立了三稳态压电振动能量采集器的非线性动力学模型.仿真研究了几何非线性和磁铁重力对系统静态解分岔、势能阱特性及其动力学响应特性的影响规律,结果表明几何非线性和磁铁重力使压电振动能量采集器产生附加的三阶和五阶非线性刚度及重力势能,导致非对称势能阱的产生.非对称势能阱不仅有利于提高三稳态压电振动能量采集器的有效工作频带和能量转换效率,还可以降低采集器对环境振动强度的要求使其在较低激励加速度下可以进入高能轨道运动.实验验证了理论仿真结果的正确性. 相似文献
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Kai Liu Weiping Zhang Wu Liu Wenyuan Chen Kai Li Feng Cui Shipeng Li 《Microsystem Technologies》2010,16(3):431-439
This paper presents design, simulation, and fabrication, levitation experiment of a micro-diamagnetic levitation system with
coils. This micro-system module can be applied in the micro-gyroscope system because of its stable levitation of disc. The
device configuration consists of three main parts: micro-disc, stator and permanent magnet (PM). Micro-disc is stably levitated
on the top of the stator and PMs due to stable diamagnetic force produced between PMs and pyrolytic graphite disc. Simulation
on levitation shows the situation of diamagnetic force at the centre, and offset from centre. Finally, from the levitation
experiment we can see clearly the influence on levitation height of PM thickness and micro-disc thickness. As far as micro-gyroscope
is concerned, coils analysis shows relationship between rotation torque and current frequency by Ansoft Maxwell, and a rotation
circuit also is designed by the authors in the end of the paper. 相似文献
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Non-resonant electromagnetic wideband energy harvesting mechanism for low frequency vibrations 总被引:1,自引:0,他引:1
A novel non-resonant energy harvesting mechanism with wide operation frequency band is investigated for collecting energy
from low frequency ambient vibration. A free-standing magnet is packaged inside a sealed hole which is created by stacking
five pieces of printed circuit board substrates embedded with multi-layer copper coils. This device was tested under various
acceleration conditions. Considering the air damping effect, two types of device structures with different covered plates
are investigated. For type I, one covered acrylic plate with drilled air holes and another plate with no holes are used to
package the moving magnet. For type II, the middle hole is sealed by two acrylic plates with drilled air holes. The output
voltage of type II is better than the one of type I at the same acceleration. When the energy harvester of type II is shook
at 1.9 g acceleration along longitudinal direction of the hole, the 9 mV output voltage with 40 Hz bandwidth, i.e., from 40
to 80 Hz, is generated. The maximum output power within the ranges of 40–80 Hz, i.e., operation bandwidth, is measured as
0.4 μW under matched loading resistance of 50 Ω. Experimental results show that type I device has wider frequency bandwidth,
higher center frequency and smaller output voltage than type II device because type I device experiences severe damping influence. 相似文献
14.
Fei FeiAuthor VitaeJohn D. MaiAuthor Vitae Wen Jung LiAuthor Vitae 《Sensors and actuators. A, Physical》2012,173(1):163-171
This paper describes a low-speed wind energy harvesting system that transfers aerodynamically induced flutter energy into electrical energy. A random airflow generates mechanical vibrations due to the fluid-structure interaction between a flexible belt and the airflow. An electromagnetic resonator with copper coils and a permanent magnet is designed to efficiently harvest electrical energy from the induced mechanical vibrations. Different groups of springs are compared at various wind conditions to maximize the power output. Typically ∼7 mW of electrical energy can be obtained at ∼3 m/s wind speed with a 1 m long belt. A power conditioning circuit with a charge pump and a DC-DC converter is used to convert the generated voltage into a stable 3.3 V DC for consumption. It is demonstrated that this generator can be used to drive a commercial wireless temperature sensor. 相似文献
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Peihong Wang Katsuhiko Tanaka Susumu Sugiyama Xuhan Dai Xiaolin Zhao Jingquan Liu 《Microsystem Technologies》2009,15(6):941-951
This paper presents a micro electromagnetic energy harvester which can convert low level vibration energy to electrical power.
It mainly consists of an electroplated copper planar spring, a permanent magnet and a copper planar coil with high aspect
ratio. Mechanical simulation shows that the natural frequency of the magnet-spring system is 94.5 Hz. The resonant vibration
amplitude of the magnet is 259.1 μm when the input vibration amplitude is 14 μm and the magnet-spring system is at resonance.
Electromagnetic simulation shows that the linewidth and the turns of the coil influence the induced voltage greatly. The optimized
electromagnetic vibration energy harvester can generate 0.7 μW of maximal output power with peak–peak voltage of 42.6 mV in
an input vibration frequency of 94.5 Hz and input acceleration of 4.94 m/s2 (this vibration is a kind of low level ambient vibration). A prototype (not optimized) has been fabricated using MEMS micromachining
technology. The testing results show that the prototype can generate induced voltage (peak–peak) of 18 mV and output power
of 0.61 μW for 14.9 m/s2 external acceleration at its resonant frequency of 55 Hz (this vibration is not in a low ambient vibration level). 相似文献
17.
Axial-flux permanent magnet machines for micropower generation 总被引:2,自引:0,他引:2
This paper reports on the design, fabrication, and testing of an axial-flux permanent magnet electromagnetic generator. The generator comprises a polymer rotor with embedded permanent magnets sandwiched between two silicon stators with electroplated planar coils. Finite element simulations have been carried out using ANSYS to determine the effects on performance of design parameters such as the number of layers in the stator coils, and the rotor-stator gap. The effect of including soft magnetic pole pieces on the stators has also been studied. A prototype device with a diameter of 7.5 mm has been tested, and shown to deliver an output power of 1.1 mW per stator at a rotation speed of 30 000 rpm. The generator has been integrated with a microfabricated axial-flow microturbine to produce a compact power conversion device for power generation and flow sensing applications. 相似文献