Abstract
Magnetic gears exhibit torque transfer densities that are comparable to those of helical gears because all the permanent magnets arranged along the circumferential direction contribute to power transmission. However, the reduction ratio that can be realized with a single magnetic gear is not theoretically limited; however, this parameter is not effective in a single gear owing to the decrease in the magnetic strength of the permanent magnet depending on its volume. High reduction ratio can be realized by connecting multiple magnetic gears in series. This study examines the power transfer characteristics of a double reduction gear unit with two magnetic gears having a reduction ratio of 1/3.25. The theoretical modeling, frequency response characteristics, and control test results of this system implemented using hardware are described in detail.
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