TITLE:
Characteristics of and Control over Resonance in the Electromotive Force of Electromagnetic Induction
AUTHORS:
Sang Don Bu, Jin Kyu Han, Jin Young Hyeon, Gi Gwan Kim
KEYWORDS:
Electromagnetic Induction; Electromotive Force; Resonator, Resonance/Anti-Resonance Frequency
JOURNAL NAME:
Journal of Electromagnetic Analysis and Applications,
Vol.5 No.8,
August
6,
2013
ABSTRACT:
The principles of electromagnetic induction are applied in many devices
and systems, including induction cookers, transformers and wireless energy transfer;
however, few data are available on resonance in the electromotive force (EMF)
of electromagnetic induction. We studied electromagnetic induction between two
circular coils of wire: one is the source coil and the other is the pickup (or
induction) coil. The measured EMF versus frequency graphs reveals the existence
of a resonance/anti-resonance in the EMF of electromagnetic induction through
free space. We found that it is possible to control the system’s resonance and
anti-resonance frequencies. In some devices, a desired resonance or antiresonance
frequency is achieved by varying the size of the resonator. Here, by contrast,
our experimental results show that the system’s resonance and anti-resonance
frequencies can be adjusted by varying the distance between the two coils or
the number of turns of the induction coil.