Multi-directional and broadband vibration energy harvester using magnetoeletric transducer

作者：Yue Xihai^*; Yang Jin; Wen Yumei; Li Ping; Bai Xiaoling

来源：Chinese Journal of Scientific Instrument, 2013, 34(9): 1961-1967.

• Broadband vibration
• Magnetic field distribution
• Magnetic force
• Magnetic-field intensity
• Non-linear dynamic equations
• Non-linear vibrations
• Nonlinear oscillation
• Vibration energy harvesters

Aiming at the problems that existing vibration energy harvesters can only pick up the energy in single direction and narrow bandwidth, a multi-directional and broadband vibration energy harvester using magnetoelectric transducer is proposed. The harvester consists of a cylinder elastic cantilever beam, a ring magnetic circuit and a complex magnetoelectric transducer. Owing to the magnetic coupling, the cylinder elastic cantilever beam exhibits a nonlinear oscillation characteristic in arbitrary directions in the cross-section plane, as well as a wide bandwidth. The nonlinear dynamic equation and electrical-output model of the cylinder elastic cantilever beam are developed. The magnetic analysis software Ansoft Maxwell is used to analyze the magnetic field distributions of 3 magnetic circuits composed of rectangular, round and ring permanent magnets; and the influences of the nonlinear magnetic force, magnetic field intensity and their variations for different magnetic circuits on the nonlinear dynamic equation and electrical-output are analyzed, which provides the design basis for designing the vibration energy harvesters with better performances. The experimental results show that the harvester with ring magnetic circuit can pick up the vibration energy at arbitrary angles from 0° to 180° with a bandwidth range from 4.4 Hz to 5.6 Hz under the acceleration of 5.88 m/s2, and has the maximum power of 0.5 mW across an optimal resistance of 3 MΩ.

• 出版日期2013