Patent ID: 9041230
Filing Date: 2015-05-26
Classification: H02K

Abstract:
1. A vibrational energy harvester, comprising: a conductive coil; and a magnet array, wherein the magnet array forms a cavity, wherein the magnet array produces internal magnetic fields within the cavity, wherein the internal magnetic fields have an internal magnetic field pattern, wherein the magnet array produces external magnetic fields in a region outside of the magnet array and outside of the cavity, wherein the external magnetic fields have an external magnetic field pattern, wherein an external maximum magnitude of the external magnetic field pattern is less than or equal to 20% of an internal maximum magnitude of the internal magnetic field pattern, wherein the external maximum magnitude is at least as large as any other magnitude of the external magnetic field pattern and the internal maximum magnitude is at least as large as any other magnitude of the internal magnetic field pattern, wherein the conductive coil is positioned with respect to the magnet array, and the vibrational energy harvester is configured, such that motion of the vibrational energy harvester causes relative motion between the conductive coil and the magnet array such that relative motion between the conductive coil and the magnet array results in a change in an amount of magnetic flux of the internal magnetic fields through the conductive coil that causes one or more of the following: an electric current in the conductive coil, and a voltage in the conductive coil.