The comparative study on two controllers of torque ripples in the photoelectric tracking servo system

According to the inevitable nonlinear torque disturbances in the photoelectric tracking position servo system using the permanent magnet torque motor, two diffident suppression methods are put forward into the application for high stability and accuracy of the servo system in this paper. The design of control structure of two diffident regulators and its mechanisms for the motor torque ripple interferences are discussed. Based on the modeling for the controlled photoelectric servo system and the torque ripple of the permanent magnet torque motor, we adopt Matlab to analyze the control methods of the permanent magnet torque motor servo system. The simulation results of the two controllers demonstrate that the feedback regulator with three closed loops is better than the position-velocity regulator. The results indicate that the adoption of the additional control loop is more effective in improving the steady-state tracking accuracy, obtaining satisfactory dynamic characteristics and restraining the corresponding motor torque disturbances in the controller with position, velocity and acceleration closed loops than the double-loop feedback control compensator.