Laser Powered Actuator and its Closed Loop Rotation Speed and Torque Control

The wire connection under harsh environmental conditions (high temperature or high radiation) results in many limitations. Laser power transmission (LPT) is regarded as a convenient conduit for power delivery wirelessly. LPT has many benefits, which include zero electromagnetic interference, immunization from temperature and radiation, and long transmission distance. Based on the LPT structure, an LPT powered actuator system is proposed. The steady-state characteristic of the system is analyzed, and the result shows the steady-state characteristic mainly depends on the load torque. A robust speed control method is proposed by feedback of the DC motor speed to determine the laser on/off state to adjust the speed. The result indicates that in the analyzed-controllable range, the speed is stably controlled.