Limited motion rotary actuators of the toroidal-stator, permanent-magnet rotor type

Some aspects of the design of a toroidal-stator, permanent-magnet, salient-pole-rotor type of limited rotation, double-acting rotary actuator are examined. Curves are presented which show how important design parameters are affected by the airgap size. Analysis leading to the prediction of stator self inductance, for a variety of types of rotor configuration, is presented. Test results are compared with theoretical predictions.