The present disclosure is related to an electromagnetic kinetic energy harvester that uses movements into rotations converter.
State of the art magnetic kinetic energy harvester, described schematically in
This patent application relates to electromagnetic kinetic energy harvester that converts vibration or a linear motion of a body into rotation of an electromagnetic device relative to a coil where the electromagnetic device and the coil may be fixed to the body. The electromagnetic device may be a simple magnet. The magnet may be a non-symmetrical magnet fixed to a hinge such that the center of gravity is off the center of the hinge such that movements of the body cause the magnet to rotate around the hinge and relative to the coil. The invention uses a push back magnet that replaces the spring that is used in the prior art. The rotation of the magnet around a hinge instead of a straight movement that requires a stop and the use of a push back magnet results in a robust kinetic energy harvester.
The magnet (3) is connected to the body (100) by an axial connection (51) that enables the magnet (3) to rotate about an axis of rotation (52). The connection of the magnet to the body is in a connecting point that makes the axis of rotation in a distal and away from the center of gravity (31) of the magnet (3).
The push-back magnet (4) that is fixed to the body is designed to exert repulsive force on the magnet that causes the magnet (3) to rotate about its axis of rotation (52) in such a way that the center of gravity (31) of the magnet (3) rotates away from the push-back magnet (4).
The kinetic excitations of the body (100) cause the magnet (3) to rotate about its axis of rotation (52) in such a way that the center of gravity (31) of the magnet (3) rotates towards the push-back magnet (4), hut then the push-back magnet (4) that exert repulsive force on the magnet causes the magnet (3) to rotate away from the push-hack magnet (4), and so on go and back.
These rotations of the magnet that happened relative to the coil (when its center of gravity rotates away from the push-back magnet (4) and towards the push-back magnet (4)) create alternating voltage between the ends (21) (22) of the coil (2).