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首页> 外文会议>Conference on active and passive smart structures and integrated systems >Improved Design of Linear Electromagnetic Transducers for Large-Scale Vibration Energy Harvesting
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Improved Design of Linear Electromagnetic Transducers for Large-Scale Vibration Energy Harvesting

机译：用于大规模振动能量收集的线性电磁换能器的改进设计

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This paper presents the design and optimization of tubular Linear Electromagnetic Transducers (LETs) with applications to large-scale vibration energy harvesting, such as from vehicle suspensions, tall buildings or long bridges. Four types of LETs are considered and compared, namely, single-layer configuration using axial magnets, double-layer configuration using axial magnets, single-layer configuration using both axial and radial magnets, double-layer configuration using both axial and radial magnets. In order to optimize the LETs, the parameters investigated in this paper include the thickness of the magnets in axial direction and the thickness of the coils in the radial direction. Finite element method is used to analyze the axisymmetric two-dimensional magnetic fields. Both magnetic flux densities B_r [T] in the radial direction and power density [W/m~3] are calculated. It is found that the parameter optimization can increase the power density of LETs to 2.7 times compared with the initial design [Zuo et al, Smart Materials and Structures, vl9 n4, 2010], and the double-layer configuration with both radial and axial magnets can improve the power density to 4.7 times, approaching to the energy dissipation rate of traditional oil dampers. As a case study, we investigate its application to energy-harvesting shock absorbers. For a reasonable retrofit size, the LETs with double-layer configuration and both axial and radial NdFeB magnets can provide a damping coefficient of 1138 N·s/m while harvesting 35.5 W power on the external electric load at 0.25 m/s suspension velocity. If the LET is shorten circuit, it can dissipate energy at the rate of 142.0 W, providing of a damping coefficient of 2276 N·s/m. Practical consideration of number of coil phases is also discussed.
机译：本文介绍了管状线性电磁换能器（LET）的设计和优化，并将其应用于大规模的振动能量收集，例如从车辆悬架，高层建筑或长桥中收集能量。考虑并比较了四种类型的LET，即使用轴向磁体的单层配置，使用轴向磁体的双层配置，同时使用轴向和径向磁体的单层配置，同时使用轴向和径向磁体的双层配置。为了优化LET，本文研究的参数包括磁体在轴向的厚度和线圈在径向的厚度。有限元法被用来分析轴对称二维磁场。计算径向的磁通密度B_r [T]和功率密度[W / m〜3]。发现与初始设计相比，参数优化可以将LETs的功率密度提高到2.7倍[Zuo等，智能材料与结构，v19 n4，2010]，以及带有径向和轴向磁体的双层结构可以将功率密度提高到4.7倍，接近传统机油阻尼器的能量耗散率。作为案例研究，我们研究了其在能量收集减震器中的应用。为了获得合理的改装尺寸，双层结构的LET以及轴向和径向NdFeB磁体均可提供1138 N·s / m的阻尼系数，同时以0.25 m / s的悬挂速度在外部电负载上收集35.5 W功率。如果LET是缩短的电路，它可以以142.0 W的速率耗散能量，提供2276 N·s / m的阻尼系数。还讨论了线圈相数的实际考虑。

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