Discussion

Compared to the previous vibration energy harvester design based on a vibrating high-p beam and a stationary bias hard magnet pair, this new generation device utilizes a vibrating hard magnet pair and a stationary solenoid pair with thick multilayer high-p core materials. The multilayer high-permeability solenoids core leads to significantly increased flux change in the solenoid within one oscillation period without increasing the total volume of the device. In addition, the solenoid at both sides of the vibrating magnets makes full use of the spatially inhomogeneous bias magnetic fields on both sides of the magnets, leading to a doubled power output, and a dramatically enhanced power density by approximately 20 times over the previous energy harvester design with high-p materials.

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