This paper describes the electromagnetic vibration of a magnetic gear. The sources of the electromagnetic vibration are shown, and the components contained in the vibration are theoretically described. The components observed in the cogging torque are verified by employing 3-D finite element method and carrying out measurements on a prototype, and those which are not observed in the cogging torque are verified by employing coupled analysis between electromagnetic and structural analysis. Lastly, these results are also verified through measurements of the sound pressure.
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