A gravity energy generator that provides a better and efficient way to use electricity as a source of power. The gravity energy generator includes a horizontal casing, a plurality of magnets and a plurality of wiring. A magnet is positioned on a midpoint of a centered shaft that is adapted to rotate along the centered shaft from an electromagnetic field from the first pair of magnets placed on the first end and the second end within the interior of the horizontal casing. Other embodiments of the gravity energy generator include a horizontal casing, a plurality of magnets, a battery and a pair of copper plates as well as a horizontal casing, a plurality of magnets and a pair of magnetic push and pull devices.

A gravity energy generator that provides a better and efficient way to use electricity as a source of power. The gravity energy generator includes a horizontal casing, a plurality of magnets and a plurality of wiring. A magnet is positioned on a midpoint of a centered shaft that is adapted to rotate along the centered shaft from an electromagnetic field from the first pair of magnets placed on the first end and the second end within the interior of the horizontal casing. Other embodiments of the gravity energy generator include a horizontal casing, a plurality of magnets, a battery and a pair of copper plates as well as a horizontal casing, a plurality of magnets and a pair of magnetic push and pull devices.

An inventory management system includes a beacon or button connected to a warehouse server. The beacon buttons are placed in or near a product storage area with a number of products. The beacon has a controller and a transceiver to communicate with a server. There is a user input on the front of the beacon and several sensors able to detect a user identity and interaction with the products. When the user input is triggered, the beacon sends a message to the warehouse server including a user identity and other sensor data. Additionally, the beacon includes an energy harvester configured to power the beacon from ambient or user provided energy.

A power tool 1 including a bit socket 6 which is configured to hold a chiseling bit 7 so that the latter can move along an axis of movement 3. A magneto-pneumatic striking mechanism 2 includes a primary drive 22 that is arranged around the axis of movement 3 and that has a first magnet coil 46, a permanently and radially magnetizable ring magnet 42 and a second magnet coil 47 arranged consecutively in the striking direction 5. On the axis of movement 3, inside the magnet coils 46, 47, the striking mechanism 2 has a striker 4 and a striking block 13 arranged consecutively in the striking direction 5. An air cushion 23 acts upon the striker 4 in the striking direction 5.

The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (.sub.1,.sub.2) of the electric charge extraction circuit based on detected harvested power (P.sub.HARVEST), each of the first and second parameters (.sub.1,.sub.2) influencing the amount of damping of the mechanical resonator and at least the first parameter (.sub.1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (.sub.1,.sub.2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (.sub.1,.sub.2) of the electric charge extraction circuit based on detected harvested power (P.sub.HARVEST), each of the first and second parameters (.sub.1,.sub.2) influencing the amount of damping of the mechanical resonator and at least the first parameter (.sub.1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (.sub.1,.sub.2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

A vibration energy harvester includes a proof mass that is a magnetic array or a coil array. The magnetic array has multiple magnets. The coil array has one or more coils. The vibration energy harvester includes an enclosed chamber. The enclosed chamber has the other of the coil array or the magnetic array that is not the proof mass. The one or more copper coils and the multiple magnets are configured to generate the electrical energy from a relative movement between the one or more copper coils and the multiple magnets. The vibration energy harvester includes a liquid suspension that suspends the proof mass within the enclosed chamber.

A power generating element 1 according to an embodiment includes a displacement member 10, a displacement member 20, and a fixed member 30. The displacement member 10 and the displacement member 20 are connected via an elastic deformation body 41. The displacement member 10 is connected to an attachment section 51 via an elastic deformation body 42. The displacement member 10 and/or the displacement member 20 includes a first power generation surface. The fixed member 30 includes a second power generation surface opposed to the first power generation surface. An electret material layer is provided on one surface of the first power generation surface and the second power generation surface. A counter electrode layer is provided on the other surface.

A power generating element 1 according to an embodiment includes a displacement member 10, a displacement member 20, and a fixed member 30. The displacement member 10 and the displacement member 20 are connected via an elastic deformation body 41. The displacement member 10 is connected to an attachment section 51 via an elastic deformation body 42. The displacement member 10 and/or the displacement member 20 includes a first power generation surface. The fixed member 30 includes a second power generation surface opposed to the first power generation surface. An electret material layer is provided on one surface of the first power generation surface and the second power generation surface. A counter electrode layer is provided on the other surface.

An electromagnetic transducer includes a magnetic assembly and a coil assembly. The magnetic assembly may include an inner magnet subassembly and an outer magnet subassembly. The inner magnet subassembly and the outer magnet subassembly each have a plurality of axial magnets arranged in a stacked configuration with a spacer disposed between vertically adjacent axial magnets. The coil assembly includes an inner coil subassembly and an outer coil subassembly. The inner coil subassembly is disposed between the inner magnet subassembly and the outer magnet subassembly, and the outer coil subassembly is disposed around the outer magnet subassembly. The coil assembly and the magnetic assembly are configured to move relative to each other.