Innovative Robust Partial State Feedback Controller for Robotic Manipulators

Strategic Insights -

A recent study published in the International Journal of Robust and Nonlinear Control has introduced an innovative robust partial state feedback controller designed for robotic manipulators actuated by brushless DC motors. The proposed controller/observer structure relies on actuator current and robot joint position measurements, effectively compensating for dynamic uncertainties in both electrical and mechanical subsystems. This approach eliminates the need for precise knowledge of system parameters and ensures the semi-global, uniformly ultimately bounded joint tracking error signal. The effectiveness of the proposed method has been demonstrated through experimental studies conducted on an in-house-built two-link robotic manipulator.

Key Takeaways:

  • The proposed controller/observer structure is designed for robotic manipulators actuated by brushless DC motors, relying solely on actuator current and robot joint position measurements.
  • The controller effectively compensates for dynamic uncertainties in both electrical and mechanical subsystems, eliminating the need for precise knowledge of system parameters.
  • The proposed approach ensures the semi-global, uniformly ultimately bounded joint tracking error signal, affirming the overall stability of the closed-loop system through Lyapunov-based arguments.
  • Experimental studies conducted on an in-house-built two-link robotic manipulator demonstrated the effectiveness and feasibility of the proposed method.
  • The innovation of this research lies in the elimination of joint velocity measurements, allowing for more robust and efficient control of robotic manipulators.
  • The proposed controller has been demonstrated to be effective in compensating for dynamic uncertainties in the electrical and mechanical subsystems of robotic manipulators.

Statistics:

  • The proposed controller has been designed for robotic manipulators with two-link structure.
  • The experimental studies were conducted on an in-house-built robotic manipulator actuated by brushless DC motors.
  • The proposed controller/observer structure relies on actuator current and robot joint position measurements.
  • The closed-loop system stability was affirmed through Lyapunov-based arguments.
  • The proposed control method eliminates the need for precise knowledge of system parameters, allowing for semi-global, uniformly ultimately bounded joint tracking error signal.

Sources:

  • Tracking Control of Robot Manipulators Actuated By Brushless Dc Motors: Elimination of Joint Velocity Measurements With a Robust Observer. International Journal of Robust and Nonlinear Control, 2024;34(12):8465-8480.
  • VertcalNews. Study Results from Edge University Provide New Insights into Robotics (Tracking Control of Robot Manipulators Actuated By Brushless Dc Motors: Elimination of Joint Velocity Measurements With a Robust Observer). Journal of Engineering. October 20, 2025; p 4425.