Thermal micro energy harvesting by thermomagnetic film actuation

通过热磁薄膜驱动进行热微能收集

• 批准号: 230771024
• 负责人: Privatdozent Dr. Sebastian Fähler
• 金额: --
• 依托单位: Institut für Ionenstrahlphysik und Materialforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/230771024?language=en
• 关键词: Thermal; micro; energy; harvesting; thermomagnetic

This project on “Thermal micro energy harvesting by thermomagnetic film actuation” investigates a novel approach to generate electrical energy from thermal energy on the miniature scale. It expands a precursor project at KIT, in which thermomagnetic generators (TMGs) have been developed, reaching average power densities of the active material of 118 mW cm-3 and 5% of Carnot efficiency. These specifications already compete with the best thermoelectric generators at the length scale of a centimetre and below. The current project addresses the key characteristics of a TMG: (1) Expansion of the usable temperature range to 30–100°C, (2) increase of electrical power, and (3) improvement of thermodynamic efficiency. As the performance of miniaturized TMGs is intimately connected with the functional properties of the thermomagnetic films used, this joint proposal brings together the complementary competence on microsystem engineering of KIT and thermomagnetic materials science of IFW.For optimization of TMG characteristics (1)-(3), the thermomagnetic properties of Ni-Mn-based Heusler and Ga-based films (transition temperatures, temperature-dependent change of magnetization, dM/dT, hysteresis) will be tailored by varying composition and degree of order. The design of the TMGs will be optimized by improving heat transfer, enhancing magnetic field gradient, as well as tuning mechanical resonance. In particular, for the improvement of heat transfer micromachined films will be applied, containing trenches filled by Cu. The scaling properties of TMG characteristics will be investigated experimentally, as well as by lumped element modelling. Based on the optimum scaling of a single TMG, distributed systems of 1D and 2D arrays of TMGs will be developed in order to bring the total power in line with the practical needs of IoT and industry4.0.

这个“通过热磁薄膜驱动进行热微能量收集”的项目研究了一种在微型规模上从热能产生电能的新方法。它扩展了 KIT 的前驱项目，其中开发了热磁发电机 (TMG)，活性材料的平均功率密度达到 118 mW cm-3 和 5% 的卡诺效率。这些规格已经可以与一厘米及以下长度范围内最好的热电发电机竞争。当前的项目解决了 TMG 的关键特性：(1) 将可用温度范围扩大到 30–100°C，(2) 增加电力，以及 (3) 提高热力学效率。由于小型化TMG的性能与所用热磁薄膜的功能特性密切相关，该联合提案汇集了KIT的微系统工程和IFW的热磁材料科学的互补能力。为了优化TMG特性（1）-（3），Ni-Mn基Heusler和Ga基薄膜的热磁性能（转变温度， 随温度变化的磁化强度、dM/dT、磁滞）将通过不同的成分和有序度进行定制。 TMG 的设计将通过改善传热、增强磁场梯度以及调整机械共振来优化。特别是，为了改善传热，将应用微机械薄膜，其中包含由铜填充的沟槽。 TMG 特性的缩放特性将通过实验以及集总元件建模进行研究。基于单个TMG的最佳缩放，将开发TMG的一维和二维阵列的分布式系统，以使总功率符合物联网和工业4.0的实际需求。