The exact origin of coil whine lies in the electromagnetic coils present ... but as more power flows through the coils, the vibration becomes more pronounced and the tone becomes louder.

Electromagnetic ... EI coils and magnet cores, the most commonly used components in energy harvesters, to come up with a novel design for energy-efficient and high-power-output EI-type vibration ...

Researchers propose a novel design for electromagnetic induction type vibration energy harvesters ... using larger and stronger magnets and more coil turns. However, an innovative approach ...

Its Vibration Energy ... s Principle of Electromagnetic Induction to generate electricity. Brother managed to cram an electromagnetic induction generator comprised of a coil, a magnet and a ...