In this study, the authors proposed an electromagnetic harmonic movable tooth drive system. , The forced
response equation of the drive system to exciting currents was developed. Using this equation, the forced responses of the
drive system to exciting currents were investigated. The results show that the forced responses of the drive system to the
exciting currents were affected by mechanical and electric parameters. To reduce the vibrating amplitudes, smaller coil
current, flexible ring radius, and average static displacement of the flexible ring, increased thickness of the flexible ring,
clearance between the flexible ring and coils, and coil pole pair number should be taken into account. The results can be
used for designing the system and further study of the dynamics performance of the drive system.