In recent years, battery-free self-powered sensing has attracted much attention. However, effective energy harvesting over wide frequency bandwidth is still a great challenge. This paper explores a bistable vibration energy harvester. The harvester uses a spherical magnet as a moving magnet, combining the restoring force of limit spring, attractive magnetic force and gravity to achieve bistability to increase power output and bandwidth. A prototype of the harvester is constructed and characterized experimentally. The nonlinear dynamic model of the harvester is formulated and validated using the experimental data. The impedance matching experiment is carried out at a fixed frequency. The working frequency range is 12–43 Hz at 4.5 g. The maximum peak to peak output voltage is 18.9 V. At 40 Hz and with a 900 Ω load, the output power reaches 11.5 mW.

近年来，无电池自供电传感备受关注。然而，在宽频率带宽上进行有效的能量收集仍然是一个巨大的挑战。本文探讨了一种双稳态振动能量采集器。收割机采用球形磁体作为动磁体，结合限位弹簧的恢复力、磁吸力和重力实现双稳态以增加功率输出和带宽。收割机的原型被构建并通过实验表征。利用实验数据制定并验证了收割机的非线性动力学模型。阻抗匹配实验在固定频率下进行。工作频率范围为 12-43 Hz，4.5 g。最大峰峰值输出电压为 18.9 V。在 40 Hz 和 900 Ω 负载下，输出功率达到 11.5 mW。