›› 2014, Vol. 23 ›› Issue (8): 84501-084501.doi: 10.1088/1674-1056/23/8/084501

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Broadband energy harvesting via magnetic coupling between two movable magnets

樊康旗, 徐春辉, 王卫东, 方阳   

  1. School of Electronical & Mechanical Engineering, Xidian University, Xi'an 710071, China
  • 收稿日期:2013-11-01 修回日期:2013-12-23 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51205302) and the Fundamental Research Funds for the Central Universities, China (Grant No. K5051304011).

Broadband energy harvesting via magnetic coupling between two movable magnets

Fan Kang-Qi (樊康旗), Xu Chun-Hui (徐春辉), Wang Wei-Dong (王卫东), Fang Yang (方阳)   

  1. School of Electronical & Mechanical Engineering, Xidian University, Xi'an 710071, China
  • Received:2013-11-01 Revised:2013-12-23 Online:2014-08-15 Published:2014-08-15
  • Contact: Fan Kang-Qi E-mail:kangqifan@gmail.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51205302) and the Fundamental Research Funds for the Central Universities, China (Grant No. K5051304011).

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摘要： Harvesting energy from ambient mechanical vibrations by the piezoelectric effect has been proposed for powering microelectromechanical systems and replacing batteries that have a finite life span. A conventional piezoelectric energy harvester (PEH) is usually designed as a linear resonator, and suffers from a narrow operating bandwidth. To achieve broadband energy harvesting, in this paper we introduce a concept and describe the realization of a novel nonlinear PEH. The proposed PEH consists of a primary piezoelectric cantilever beam coupled to an auxiliary piezoelectric cantilever beam through two movable magnets. For predicting the nonlinear response from the proposed PEH, lumped parameter models are established for the two beams. Both simulation and experiment reveal that for the primary beam, the introduction of magnetic coupling can expand the operating bandwidth as well as improve the output voltage. For the auxiliary beam, the magnitude of the output voltage is slightly reduced, but additional output is observed at off-resonance frequencies. Therefore, broadband energy harvesting can be obtained from both the primary beam and the auxiliary beam.

关键词: piezoelectric conversion, mechanical vibration, magnetic coupling, energy harvesting

Abstract: Harvesting energy from ambient mechanical vibrations by the piezoelectric effect has been proposed for powering microelectromechanical systems and replacing batteries that have a finite life span. A conventional piezoelectric energy harvester (PEH) is usually designed as a linear resonator, and suffers from a narrow operating bandwidth. To achieve broadband energy harvesting, in this paper we introduce a concept and describe the realization of a novel nonlinear PEH. The proposed PEH consists of a primary piezoelectric cantilever beam coupled to an auxiliary piezoelectric cantilever beam through two movable magnets. For predicting the nonlinear response from the proposed PEH, lumped parameter models are established for the two beams. Both simulation and experiment reveal that for the primary beam, the introduction of magnetic coupling can expand the operating bandwidth as well as improve the output voltage. For the auxiliary beam, the magnitude of the output voltage is slightly reduced, but additional output is observed at off-resonance frequencies. Therefore, broadband energy harvesting can be obtained from both the primary beam and the auxiliary beam.

Key words: piezoelectric conversion, mechanical vibration, magnetic coupling, energy harvesting

中图分类号:  (Mechanical energy, work, and power)

  • 45.20.dg
46.70.De (Beams, plates, and shells) 68.35.Gy (Mechanical properties; surface strains)