Abstract
An automatic electric power generator that utilizes self-excited rotation has been investigated as a power supply for information devices. By the approximate analysis with the dynamic model and the numerical simulation, the conditions that the self-exited rotation takes place are clarified. In order to create self-excited rotation, a system that increases the angular speed is suggested. When increasing the rotational speed, the motor is used as an actuator rather than a generator. The experimental results show that generating output increases from 10μW to 380μW by the system. The input voltage and time was optimized to reduce energy loss. A system that increases the rotational speed till self-excited rotation occurs in order to lessen the influence of the initial mass position and angular speed is proposed.
