Coupling Effects in Parallel Thermomagnetic Generators Based on Resonant Self-Actuation

Joel Joseph, Mira Wehr, Hiroyuki Miki, Makoto Ohtsuka, Manfred Kohl

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigate the cross coupling between parallel operating thermo-magnetic generators (TMGs) on their dynamic performance and power output. TMGs are an emerging technology for waste heat recovery. Here, TMG operation relies on the abrupt drop of magnetization at the Curie temperature of a magnetic shape memory (MSMA) film of Ni-Mn-Ga mounted at the front of a cantilever and on rapid heat transfer due to the film's large surface-to-volume ratio. Parallel designs are highly demanded to increase power output. When exposed to heat source temperatures Ts of 110-170 °C, resonant self-oscillation of each cantilever is excited in the range of 50-70 Hz resulting in a power output up to 30mWcm3 for each TMG. At low Ts, oscillations remain stable even for a small distance D of 0.4 mm between cantilevers, while at \Tsgeq\ 1502, instabilities occur below D=1 mm affecting power output.

Original languageEnglish
Title of host publication21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages463-466
Number of pages4
ISBN (Electronic)9781665412674
DOIs
Publication statusPublished - 2021 Jun 20
Event21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021 - Virtual, Online, United States
Duration: 2021 Jun 202021 Jun 25

Publication series

Name21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021

Conference

Conference21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021
Country/TerritoryUnited States
CityVirtual, Online
Period21/6/2021/6/25

Keywords

  • energy harvesting
  • magnetic shape memory film
  • Ni-Mn-Ga
  • self-actuation
  • Thermomagnetic generator
  • waste heat recovery

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Control and Optimization
  • Instrumentation

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