
Proceedings Paper
Improved design of linear electromagnetic transducers for large-scale vibration energy harvestingFormat | Member Price | Non-Member Price |
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Paper Abstract
This paper presents the design and optimization of tubular Linear Electromagnetic Transducers (LETs) with applications
to large-scale vibration energy harvesting, such as from vehicle suspensions, tall buildings or long bridges. Four types of
LETs are considered and compared, namely, single-layer configuration using axial magnets, double-layer configuration
using axial magnets, single-layer configuration using both axial and radial magnets, double-layer configuration using
both axial and radial magnets. In order to optimize the LETs, the parameters investigated in this paper include the
thickness of the magnets in axial direction and the thickness of the coils in the radial direction. Finite element method is
used to analyze the axisymmetric two-dimensional magnetic fields. Both magnetic flux densities Br [T] in the radial
direction and power density [W/m3] are calculated. It is found that the parameter optimization can increase the power
density of LETs to 2.7 times compared with the initial design [Zuo et al, Smart Materials and Structures, v19 n4, 2010],
and the double-layer configuration with both radial and axial magnets can improve the power density to 4.7 times,
approaching to the energy dissipation rate of traditional oil dampers. As a case study, we investigate its application to
energy-harvesting shock absorbers. For a reasonable retrofit size, the LETs with double-layer configuration and both
axial and radial NdFeB magnets can provide a damping coefficient of 1138 N·s/m while harvesting 35.5 W power on the
external electric load at 0.25 m/s suspension velocity. If the LET is shorten circuit, it can dissipate energy at the rate of
142.0 W, providing of a damping coefficient of 2276 N·s/m. Practical consideration of number of coil phases is also
discussed.
Paper Details
Date Published: 27 April 2011
PDF: 11 pages
Proc. SPIE 7977, Active and Passive Smart Structures and Integrated Systems 2011, 79770O (27 April 2011); doi: 10.1117/12.880579
Published in SPIE Proceedings Vol. 7977:
Active and Passive Smart Structures and Integrated Systems 2011
Mehrdad N. Ghasemi-Nejhad, Editor(s)
PDF: 11 pages
Proc. SPIE 7977, Active and Passive Smart Structures and Integrated Systems 2011, 79770O (27 April 2011); doi: 10.1117/12.880579
Show Author Affiliations
Xiudong Tang, Stony Brook Univ. (United States)
Lei Zuo, Stony Brook Univ. (United States)
Lei Zuo, Stony Brook Univ. (United States)
Teng Lin, Stony Brook Univ. (United States)
Peisheng Zhang, Stony Brook Univ. (United States)
Peisheng Zhang, Stony Brook Univ. (United States)
Published in SPIE Proceedings Vol. 7977:
Active and Passive Smart Structures and Integrated Systems 2011
Mehrdad N. Ghasemi-Nejhad, Editor(s)
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