Force and stress for electromechanical integrated toroidal drive

The force and stress for electromechanical integrated toroidal drive were examined. The drive consisted of four basic elements that include the central worm, planets, a toroidal shaped stator, and a rotor, which forms the central output shaft upon which the planets are mounted. The coils were mounted in helical grooves of the worm surface. The planets and the stator have permanent magnets instead of teeth. The coordinate transformation principle was used to obtain the internal forces on normal section of the stator tooth. The results showed that the internal forces and torques in stator tooth were all zero for single tooth mesh, at initial and final mesh points between planet and stator. There were abrupt changes of the internal forces and torques at mesh points. The internal forces and torques in stator tooth were much larger at three teeth mesh regions than those at two teeth mesh regions. There were two dangerous points on the normal section of the stator tooth.