A hula-hoop energy-harvesting system

C. H. Lu*, Y. J. Wang, C. K. Sung, Chang-Po Chao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


This paper proposes a hula-hoop energy-harvesting system that integrates a hula-hoop motion transformer with an electromagnetic generator. The hula-hoop motion transformer converts the linear motion from environment, machinery, or even human body into rotational one under specifically designed dynamic conditions. Then, the system can generate power through electromagnetism after combining the electromagnetic generator with the rotational motion. The equations prescribing the relation between induced voltage and power for the system are derived according to Faraday's theory. Meanwhile, the physical model of energy-harvesting system is established and the governing dynamic equations are derived as well via the Lagrange's equations. Good agreement of induced voltage and power between theoretical and experimental results is obtained. The maximum power that the system can generate is approximately 5 mW when the frequency and amplitude of the external excitation are 8 Hz and 11.2 N, respectively.

Original languageEnglish
Article number6028060
Pages (from-to)2395-2398
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
StatePublished - 1 Oct 2011


  • Electromagnetic induction
  • energy-harvesting system
  • Faraday's theory
  • hula-hoop motion transformer

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