Spinning Magnets in Electromagnetic Education
Recently, spinning magnets have been used to mechanically generate time-varying electromagnetic fields.
While this is inherently an extremely inefficient technique limited to near-field applications, the merit of spinning magnets is the strong practical and educational link between small loop antennas and short magnetic dipoles with fictitious charges.
Furthermore, important topics relevant to antennas, propagation and communications are considered when studying the performance of spinning magnets.
This paper identifies a discrepancy in a major antenna text that leads to a singularity when determining the electromagnetic fields of a spinning magnet.
Comparisons between calculations and published measurements of spinning magnets are also provided.
M. C. Walden, “Spinning Magnets in Electromagnetic Education”, IEEE International Antennas and Propagation Symposium, Atlanta, GA, USA, 7–12 July 2019.
doi: 10.1109/APUSNCURSINRSM.2019.8888377