Nonlinear leakage model of rotary vane actuator

Rotary vane actuator is a high-precision actuating mechanism. Internal structure of seals is more complex than the other actuators. Nonlinear leakage model of rotary vane actuator was put forward based on the analysis of the character of seals of rotary vane actuator. Rotary vane actuator's total leakage consists of three parts. Each part of leakage was analyzed. The key factors of leakage were found. The method of decrease leakage of rotary vane actuator was applied via analysis. In operation, the problem of seal failure existed. The reason of seal failure is about shaft shoulder seals. Increase the compression quantity of O-ring of shaft shoulder seals could prevent seal failure. Leakage of rotary vane actuator not only related to load pressure and velocity of actuator, but related to the rotary angle of vane. The nonlinear model provided the theory proof for electro-hydraulic servo system for rotary vane actuator.