| 摘要 |
<p>A power generation device (1) has a magnetostrictor (10) and a permanent magnet (6) provided adjacent to and apart from the magnetostrictor (10), wherein the permanent magnet (6) is disposed so that the magnetization direction thereof coincides with the axial direction of a magnetostrictive rod (2). The magnetization direction length of the permanent magnet (6) is shorter than the axial direction length of a region where the coil (3) of the magnetostrictive rod (2) is wound, and the permanent magnet (6) is provided so as to correspond to an axial direction middle of the region where the coil (3) of the magnetostrictive rod (2) is wound. When the axial direction length of the region where the coil (3) of the magnetostrictive rod (2) is wound is denoted by A [mm] and the magnetization direction length of the permanent magnet (6) is denoted by B [mm], it is preferable that the power generation device (1) is constructed so as to satisfy a relationship of B≤0.6A.</p> |
