Rising requirements for a new constructions, devices and machines force engineers to monitor them all day long.
An attractive solution seems to be applications of wireless sensors. However, there is a barrier limiting their
application, which is the need to supply them with an electrical power over extended period of time without
using additional wiring or batteries. The potential solution of this problem seems to be an energy harvesting.
Most methods of obtaining the energy from the external sources e.g. vibrations, is to use piezoelectric materials.
However, the amount of energy generated by piezoelectric materials is smaller than most electronic devices
need. Therefore a new method for generating a pulse of energy and conditioning for other loads devices must
be developed. This paper proposes a new energy harvesting device based on magnetostrictive material. In the
course of the experiments with using Terfenol-D rods as actuators and sensors it has been observed interesting
phenomenon. Mechanical impact (e.g.energy between 1J and 10J in infinite time) to magnetic core based on
Terfenol-D rod (diameter 5mm, length 10 mm), NdFeB permanent magnets and coil allowed get electric power
signal enough to supply device of 100 Ohm load on their active state (typical low power controller). In comparison
to the same magnetic circuit built with other typical ferromagnetic materials e.g. Armco iron, showed effect
10 times lower or none. Tests and experiments showed the important role of coupling Terfenol-D and NdFeB
permanent magnets, their configuration and variable coil parameters determined this effect. In regard to the
results the authors proposed the construction of a new impulse harvesting method based on Terfenol-D material
for low impedance load.