MAGNETOSTRICTIVE VIBRATION POWER GENERATION DEVICE

摘要

A magnetostrictive vibration power generation device including: a longitudinal magnetostrictive element formed of a magnetostrictive material and configured to be attached to a vibrating member at at least one end part thereof; a coil wound on a closed magnetic path constituted including the magnetostrictive element; and a permanent magnet arranged so as to apply a bias magnetic field to the closed magnetic path. A yoke member formed of a magnetic material is arranged in parallel at a side of the magnetostrictive element, and the closed magnetic path is formed including the magnetostrictive element and the yoke member, the permanent magnet is attached to the yoke member on the closed magnetic path, and the yoke member is allowed relative displacement in relation to the magnetostrictive element on at least one side in a magnetic path lengthwise direction of the closed magnetic path.

主权项

1. A magnetostrictive vibration power generation device comprising:
a longitudinal magnetostrictive element formed of a magnetostrictive material and configured to be attached to a vibrating member at at least one end part thereof; a coil wound on a closed magnetic path constituted including the magnetostrictive element; and a permanent magnet arranged so as to apply a bias magnetic field to the closed magnetic path, wherein the magnetostrictive element is subjected to vibration from the vibrating member in a direction of bending deformation, a yoke member formed of a magnetic material is arranged in parallel at a side of the magnetostrictive element, and the closed magnetic path is formed including the magnetostrictive element and the yoke member, the permanent magnet is attached to the yoke member on the closed magnetic path, the yoke member is allowed relative displacement in an axis-perpendicular direction in relation to the magnetostrictive element on at least one side in a magnetic path lengthwise direction of the closed magnetic path, and the yoke member is arranged in relation to an outer circumference surface of the magnetostrictive element in a state where, during the relative displacement, a distance between parts of the yoke member and the magnetostrictive element that transmit magnetic flux is kept constant.