Effect of The Twist Rod Angles on An Inertial Rotary Electromagnetic Energy Harvester

This paper presents the effect of the twist rod angles on an inertial rotary electromagnetic energy harvester. Adopting a twist driving system and ratchet clutch system, the harvester can convert linear motion into inertial rotation. There is a remarkable increase of the output when the twist rod is designed with an angle of 50 degrees compared with that of 80 degrees. A power output of 6.2 mW is achieved on the 50 degrees harvester when the rod speed reaches 154.93 mm/s, while the power output is only 0.34 mW on the harvester of 80 degrees. Detailed study is made to investigate the rod speed, the rotor rotating speed, the output and force on the lid. Linearity is observed in the rod speed and the output. The curve related to the 50 degrees harvester has a largest slope among all harvesters.