Electric Power Acquisition from the Vibration of an Electric Vehicle Using a Permanent Magnetic Linear Power Generator

Abstract

This study considers the possibilities of obtaining electric power from vibrational energy of an electric vehicle using a permanent magnetic linear power generator. A mover of the linear power generator can convert any mechanical vibration to electric power. A mover of the proposed linear power generator, which includes permanent magnets, is linearly driven through a stator by an external force, directly. Therefore, the generator can convert any mechanical vibrations into electrical power. Nd Fe-B magnets in the mover are placed so that the same magnetic poles face each other, in order to make the large change in magnetic flux in the coils of the stator. The coils are placed in the stator with the same interval as the magnets. Alternate coils connected in a series were wound in opposite directions to the next coil. The stator was covered with a magnetic material cover, so that the magnetic flux is extended through the cover and reduces cancellation of the flux in the coils of the stator. The pilot generator was produced on the basis of numerical simulation results derived from the distribution of the magnetic field, electromotive force and uniaxial stress. The produced linear power generator was put in an experimental apparatus that emulated the function of suspension in a car. The characteristics of the generator were measured by adding various mechanical vibrations to the experimental apparatus.