Torque ripple investigation in coaxial magnetic gearsPanteleimon Tzouganakis, Vasilios Gakos, Christos Kalligeros, Christos Papalexis, Antonios Tsolakis and Vasilios SpitasMATEC Web Conf., 366 (2022) 01004DOI: https://doi.org/10.1051/matecconf/202236601004