Torque for an electromagnetic harmonic movable tooth drive system

Abstract

The output torque of the mechanical harmonic drive is large but the teeth should be produced on the flexible ring which is a difficult task. To overcome the difficulty, the authors proposed an electromagnetic harmonic movable tooth drive system in which a large output torque can be obtained meanwhile the teeth are removed from the flexible ring. Here, the operating principle of the electromagnetic harmonic movable tooth drive system is illustrated. The forces on the flexible ring and the movable teeth are analyzed. The equation of the output torque for the drive system is developed. Using the equation, the output torque of the drive system and its changes along with the system parameters are investigated. The results show that large coil current, large speed ratio, large flexible ring radius and small flexible ring length, small gas gap should be selected to obtain a large output torque. The results are useful for the further study and application of the drive system.