Journal
IEEE MAGNETICS LETTERS
Volume 12, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMAG.2021.3088403
Keywords
Electromagnetics; demagnetizing field; patterned magnet; electromagnetic coupling; electromagnetic vibration energy harvester; in-plane vibration
Funding
- Science Foundation Ireland (SFI)
- European Regional Development Fund [13/RC/2077]
- EU-H-2020 project Enables [730957, TA 023]
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This letter presents a potential solution to power wireless sensor networks for the Internet of Things by scavenging mechanical energy from ubiquitous vibrations through miniaturized electromagnetic transducers. Through systematic design study, the compact device topology yielded high EM coupling and improved half-power bandwidth. The designs can be implemented using standard MEMS fabrication methods for potential applications in the IoT.
Scavenging mechanical energy from ubiquitous vibrations through miniaturized electromagnetic (EM) transducers is a potential solution to the problem of powering wireless sensor networks for the Internet of Things (IoT). This letter presents the design and performance analysis of fully integrated EM vibration energy harvesters on the scale of microelectromechanical systems (MEMS). Through analytical formulation and finite element analysis, we present a systematic design study to optimize the magnet-coil interaction in a precise location within a small surface area (footprint). The compact device topology yielded an EM coupling as high as 62.9 mWb/m with optimized stripe-shaped micromagnets and rectangular microcoils. The nonlinear spring topology demonstrated six times improvement in the half-power bandwidth compared to its linear counterpart, at a cost of reduced power density. The designs can be implemented using standard MEMS fabrication methods leveraging CMOS-compatible integration at the system level for potential applications in the IoT.
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