Improvement in Position Response of Laser Focus Controlled Magnetic Actuator Based on Mixed Sensitivity Robust Control

The relative position between the laser beam and nozzle is controlled by laser-focus-controlled magnetic actuators to achieve non-coaxial cutting improve efficiency. In this paper, a 3-DOF (degrees of freedom) actuator designed solve inconsistency focus in off-axis cutting. A mixed sensitivity robust controller designed, its simulation analysis experimental research are carried out. First, kinetic mathematical equations established according structure actuator. Then, analyzed using MATLAB/Simulink. control performance simulated under 20% parameter variation pulse disturbance with an uncertain model external disturbance, respectively. Finally, study step response results show that Y, X, θ directions can quickly reach steady-state value. Furthermore, error X 1.6%; Y 0.39%; 0.45%. Their errors all less than 0.025 mm, so they meet requirements. It provide technical support for