Analysis of Factors Influencing Peak Torques and Peak Losses of Rotary Voice Coil Actuators Used in Aerospace

Rotary voice coil actuators (RVCAs) are commonly used for precision servo drive systems working within limited angle range in some fields including aerospace. In this paper, expressions of RVCAs' peak torque and peak loss are derived based on a simple magnetic circuit model, and influences of wire diameter and equivalent area on peak torque and peak loss are analyzed. Especially, two unique influences of installing dimension and environment temperature for this type of motor are researched as well. Armature reaction and its restraining for this type of actuator are also studied. Finally, several effective measures of improving RVCAs' torques are summarized, which are of important value in practical engineering applications.