Affiliations: [a] Centre for Built Infrastructure Research, Faculty of
Engineering and Information Technology, University of Technology, Sydney, NSW, Australia | [b] School of Mechanical Engineering, Nanjing University
of Science and Technology, Nanjing, Jiangsu, China
Correspondence:
[*]
Corresponding author: Xuezheng Jiang, City Campus, Building
27054, PO Box 123 Broadway, NSW 2007, Australia. Tel.: +61 0406 031 113; Fax:
+61 2 9514 2435; E-mail: [email protected]
Abstract: This paper presents the design and evaluation of a novel permanent
magnet (PM) energy harvesting system for scavenging electrical energy from
ambient vibrations. A two-phase tubular linear PM vibration energy harvester
consisting of a mover attached with permanent magnets and a slotted stator with
built-in two-phase electromagnetic coils is proposed to convert vibrational
kinetic energy into electrical energy. Aiming at maximizing the efficiency of
vibration-to-electrical energy conversion under designated vibration and
limited space requirement, a systematic research, including innovative device
design, theoretical modelling and analysis, and finite element evaluation on
the PM vibration energy harvester will be presented in this paper. In addition,
the methodology of winding the two-phase coils in slotted stator is explicated
in order to fully utilize the harvested electrical energy. A two-phase
rectifier circuit is developed to convert the alternative voltage generated by
the PM harvester into DC voltage that can be used directly by the external
resistive load. Simulation results indicate that the proposed linear PM
vibration energy harvesting system is able to generate about 100 watt DC
electrical power under the vibration with the velocity of 0.4 m/s and the
output electrical power is proportional to the levels of vibration excitations.
Keywords: Energy harvesting, vibration, electromagnetic, magnetic circuit, theoretical model
