Electromagnetic induction with time-varying magductance under constant magnetic field

What is it about?

As one basic mechanism of electrical energy conversion in the world, Faraday's law of electromagnetic induction points out that the electrical current will be induced in a closed conductive coil exposed to a changing magnetic field. However, how to generate electrical current with the invariant magnetic field has never been answered by classical electromagnetic field theory and even regarded impossible. During exploring the physical essence of the new magnetic component of the magductance, we find that the magnetomotive force (MMF) or electrical current can be generated by the change of magductance under the invariant magnetic field, revealing a new law of electromagnetic induction. Thus, it provides a new way to harvest electrical energy. Experiments have been presented to verify the new electromagnetic induction law.

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Photo by israel palacio on Unsplash

Photo by israel palacio on Unsplash

Why is it important?

Our findings break through the conventional cognition that the voltage can be induced and thus the electrical current can be generated only by changing magnetic field in electromagnetic materials, and may bring revolutionary evolution to electromagnetics. Based on the new electromagnetic induction, novel electrical energy harvesting devices may be achieved, which own good potentials for wide applications.