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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Novel Two-Stage Piezoelectric-Based Electrical Energy Generators for Low and Variable Speed Rotary Machinery
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Novel Two-Stage Piezoelectric-Based Electrical Energy Generators for Low and Variable Speed Rotary Machinery

机译：用于低速和变速旋转机械的新型两阶段基于压电的电能发生器

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摘要

A novel class of two-stage piezoelectric-based electrical energy generators is presented for rotary machinery in which the input speed is relatively low, varies significantly over time, and is even reversing. This class of energy generators is highly suitable for applications such as wind mills, turbo-machinery used to harvest tidal flows, and the like. Current technology uses magnet-and-coil-based rotary generators. However, to make the generation cycle efficient, gearing or other similar mechanisms have to be used to increase the input speed to the generator. Variable speed-control mechanisms are also usually needed to achieve high mechanical to electrical energy conversion efficiency. This novel class of electrical energy generators uses a decoupled two-stage system. The harvesting environment (wind, tidal flow, etc.) directly provides input to the primary system. The low and varying input motion is then used to successively excite an array of vibrating elements (secondary system). The key advantage is that by having two decoupled systems, the low speed and highly varying input motion is converted into constant and much higher frequency mechanical vibrations, which are then harvested using piezoelectric elements. As a result, by eliminating the need for gearing and speed control mechanisms, the system complexity and cost - including those related to maintenance and service - is significantly reduced. Additionally, these novel generators can expand the application of power generation to much slower input speeds than are harvestable using current technology.
机译：提出了用于旋转机械的新型的两级基于压电的电能发生器，其中输入速度相对较低，随时间变化很大，甚至反向。这类能量产生器非常适合诸如风车，用于收集潮汐流的涡轮机械等应用。当前技术使用基于磁体和线圈的旋转发电机。然而，为了使发电周期有效，必须使用齿轮传动装置或其他类似机构来增加发电机的输入速度。通常也需要变速控制机构以实现高的机械到电能的转换效率。这类新颖的电能发生器使用解耦的两级系统。收割环境（风，潮汐流等）直接为主要系统提供输入。然后，低而变化的输入运动被用来连续激励一系列振动元件（次级系统）。关键优势在于，通过具有两个解耦系统，低速和高度变化的输入运动被转换为恒定且更高频率的机械振动，然后使用压电元件将其捕获。结果，通过消除对齿轮传动装置和速度控制装置的需求，系统的复杂性和成本（包括与维护和服务有关的成本）得以显着降低。此外，这些新型发电机可以将发电的应用范围扩展到比使用当前技术可捕获的输入速度低得多的输入速度。

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