Design and performance of linear biomechanical energy conversion devices

This paper addresses three human motions and devices for potential energy harvesting. Arm swing, horizontal foot movement, and up-down center of gravity movement during walking are analyzed for energy harvesting. Given commonality among the three motions, a general, linear-motion-coil, magnetic generator is proposed. Based on a finite-element model, prototype devices are designed and built for each motion to match their biomechanical characteristics. High-efficiency voltage multipliers are built and used as a battery charging circuit. Experimental results are reported.