Evaluation of the effect of magnetic parameters on power of an electromagnetic induction type vibration power generator

Abstract

A vibration power generator produce electricity using environmental vibration, such as floor vibration caused by people walking, vibration caused by cars and trains, and factory piping vibrations. Electric power generated by the vibration power generator is expected to be an alternative to a power source (a battery or the like) used in IoT sensor or the like. There are various types of vibration power generation such as electromagnetic induction type, magnetostriction type, piezoelectric type and electrostatic type. We are paying attention to electromagnetic induction type among them. There have been many studies on electromagnetic induction type vibration power generators, and it can be expected that the generated power will increase depending on each application. However, there are few studies to increase the generated power in the simple configuration of the vibration generator, that is, the configuration using the one-degree-of-freedom oscillator consisting of the magnetic circuit and the spring. Therefore, we constructed a mathematical model that formulated the effect of the magnetic parameters of a vibration generator using a one-degree-of-freedom oscillator on the generated power, and obtained design guidelines for a magnetic circuit for increasing the generated power. Furthermore, the validity of the model was evaluated by comparing the power generation performance test using the prototype and the calculation.