POWER GENERATION ELEMENT AND ACTUATOR USING STRUCTURE OF SAID POWER GENERATION ELEMENT

摘要

A power generation element of inverse magnetostrictive type has: a first power generation part including a first magnetostrictive rod made of magnetostrictive material, a first coil wound around the first magnetostrictive rod, and a first magnetic rod having appropriate rigidity and a shape to apply a uniform compressive force or tensile force to the first magnetostrictive rod and being placed in parallel with the first magnetostrictive rod; a frame made of magnetic material bent in a substantially U shape, whose one end and other end across the bent location constitute a fixed end and free end, respectively; and a magnet. The power generation element can suppress the loss of kinetic energy while vibrating so that vibration will last long. The power generation element can be used in an actuator.

主权项

1. A power generation element of inverse magnetostrictive type characterized by having: a first power generation part comprising a first magnetostrictive rod made of magnetostrictive material, a first coil wound around the first magnetostrictive rod, and a first magnetic rod having appropriate rigidity and shape to apply a uniform compressive force or tensile force to the first magnetostrictive rod and placed in parallel with the first magnetostrictive rod; a frame made of magnetic material bent in a substantially U shape, whose one end and other end across the bent location constitute a fixed end and free end, respectively; and a magnet;
wherein the first power generation part is installed on the free-end side and/or bent location of the frame; the magnet is placed only on one of two opposing inner side faces of the frame, so that a part of the frame functions as a back yoke and a gap is also formed between the magnet and the inner side face on which the magnet is not placed; and the frame on the free-end side and frame on the fixed-end side vibrate together when an external force is applied.