https://doi.org/10.1140/epjst/e2015-02592-6
Regular Article
Magnetic force of piezoelectric cantilever energy harvesters with external magnetic field
1 School of Mechanical Engineering, Tianjin University, Tianjin 300072, China
2 Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin 300072, China
a e-mail: leng_yg@tju.edu.cn
Received: 28 August 2015
Revised: 9 September 2015
Published online: 20 November 2015
In piezoelectric cantilever energy harvesters with external magnetic field, one of the difficulties is the impact of the external magnetic field or magnetic force on vibration response and energy harvesting efficiency. Here we use the magnetizing current and magnetic dipoles approaches to analyze the magnetic force. The two calculation models are proposed for the energy harvesters. The calculation results of the two methods are compared with a set of experimental data. It has been proved that errors are produced with both methods while the magnet interval is sufficiently small. However, the calculation result achieved from magnetic dipoles approach is closer to experimental measurements than the one of magnetizing current approach. Consequently, the magnetic dipoles approach can be chosen preferably to calculate the magnetic force of piezoelectric cantilever energy harvesters with external magnetic field.
© EDP Sciences, Springer-Verlag, 2015
