This paper proposes a magnetoelectric (ME) vibration generator based on magnetic levitation. The generator uses a Halbach array and a magnet bar to constitute the suspending magnet structure of the magnetic levitation system. The Halbach array employs three NdFeB magnet rings with a particular magnetization pattern, which produces concentrated magnetic field on the outer side where the ME transducer array is placed. Consequently, the ME transducer array undergoes larger magnetic field variations and more vibration energy is converted into electrical energy. An analytical model is developed based on the solution of the kinetic equation and the equivalent circuit of the ME transducer array. Experiments have been conducted and the analytical model is validated by the experimental results. The generator produces a maximal power of 957.8μW with an optimal load resistance of 1.45MΩ at the acceleration of 0.6 g. The proposed device using a Halbach array exhibits a ∼2.5 times higher output power than that of the harvester employing a conventional suspending magnet bar.

本文提出了一种基于磁悬浮的磁电振动发生器。发生器使用Halbach阵列和磁棒构成磁悬浮系统的悬浮磁体结构。Halbach阵列使用具有特定磁化模式的三个NdFeB磁环，该环在放置ME换能器阵列的外侧产生集中磁场。因此，ME换能器阵列经受较大的磁场变化，并且更多的振动能量被转换为电能。基于动力学方程和ME换能器阵列的等效电路的解，建立了一个分析模型。已经进行了实验，并且通过实验结果验证了分析模型。发电机产生的最大功率为957。在0.6 g加速度下为Ω。所提出的使用Halbach阵列的设备的输出功率是采用传统悬挂式磁棒的收割机的2.5倍左右。