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【Applied Energy最新原创论文】基于Halbach阵列和三相印制绕组的超紧凑轻量型电磁发电机

AEii国际应用能源  · 公众号  ·  · 2023-11-18 18:30

正文

原文信息:

An ultra-compact lightweight electromagnetic generator enhanced with Halbach magnet array and printed triphase windings

原文链接:

https://www.sciencedirect.com/science/article/pii/S0306261923014393

Highlights

高度集成的Halbach阵列和三相印制绕组。

• 在不影响输出功率的情况下,提高了装置的紧凑性和轻便性。

• 在200 rpm转速下,装置功率输出达到54.9 mW,功率密度输出达到1.25 kW/m3。

在台架试验和田间测试中可驱动多种电子设备

摘要

电磁发电机(EMG)在低功耗电子设备的原位发电中起着重要的作用。目前电磁发电机面临的主要挑战在于其功率密度有限。为了解决这个问题,研究人员已经提出了多种方法,包括增强磁体的磁场、提高线圈处的磁通变化率以及结构小型化等。此研究提出了一种创新的超紧凑电磁发电机(UL-EMG),其高度集成Halbach永磁体阵列和印刷电路板(PCB)技术,在PCB定子中集成了12层的三相印制绕组,提高了装置的结构紧凑性和有限体积下的输出性能。为研究UL-EMG的输出性能,对其进行了全面的台架测试。结果表明,在200 rpm转速下,UL-EMG实现了54.9 mW的峰值交流功率输出和1.25 kW/m3的功率密度输出,可在宽转速范围内驱动多种低功耗电子设备,为EMG功率密度的提升提供了一定技术参考,展现了紧凑型EMG在原位供能方面的良好应用前景。

Abstr act

Electromagnetic generator (EMG) plays a pivotal role in in-situ power supply for low-power electronics. However, a major challenge associated with EMGs is the limited power density. To address this issue, various strategies have been proposed, including magnetic field augmentation of magnets, magnetic flux variation rate escalation at the coil, and structural miniaturization. In this study, we present an innovative ultra-compact electromagnetic generator (UL-EMG) in light weight that integrates the Halbach magnet arrays and printed circuit board (PCB) technologies. The UL-EMG incorporates a 12-layer printed triphase windings into its PCB stator, thereby upgrading both device compactness and output performance. To assess the performance of the UL-EMG, comprehensive bench tests were conducted. Interestingly, results indicate that at a low rotational speed of 200 rpm, the UL-EMG achieved a peak AC output power and power density of 54.9 mW and 1.25 kW/m3, respectively, representing a 22-fold expansion compared to conventional EMGs. Moreover, the UL-EMG exhibited exceptional output characteristics across a wide range of rotational speeds, significantly bolstering its capacity to drive various low-power electrical appliances. This study paves a novel path for heightening the power density of EMGs and highlights the promising application prospects of compact EMGs in in-situ power supply advancemen.

Keywords

Electromagnetic generatorHalbach array Halbach

Ultra-compact

Lightweight

Halbach array

Printed triphase winding

Graphics



图1. UL-EMG装置结构及原理.(a)基本结构;(b)磁路分析;(c)感应电流生成周期

图2 100-700 rpm转速下UL-EMG的单相输出性能.(a)交流开路电压;(b)交流短路电流;(c)4.5Ω负载下交流电压;(d)4.5Ω负载下交流电流;(e)直流开路电压和短路电流;(f)400 rpm转速下,匹配阻性负载的直流电压和电流;(g)400 rpm转速下的直流输出功率

图3 UL-EMG的场景应用.(a)用于环境风能驱动的拖拉机车载传感器原位供电;(b)拖拉机自供电转速传感器;(c)不同风速下UL-EMG的输出性能;(d)不同拖拉机车速下UL-EMG的输出性能;(e)气压传感器的手机APP界面和数据;(f)GPS模块输出数据;(g)温湿度传感器和三轴加速度计的APP界面和数据;(h)UL-EMG作为自供电转速传感器的速度-电压拟合结果及与商用编码器的对比

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