Modal engineering of electromagnetic circuits to achieve rapid settling times

Area of Science:

• Electrical Engineering
• Control Systems
• Applied Physics

Background:

• Inductive circuits are crucial in diverse applications like magnetic drives and NMR systems.
• Rapidly switching magnetic fields (DC/AC) is often required but challenging due to inductive response.

Purpose of the Study:

• To develop and present open-loop control algorithms for achieving rapid step and settling times in inductive circuits.
• To provide practical, easy-to-apply algorithms for engineers working with inductive devices.

Main Methods:

• Developed distinct algorithms for four categories of inductive systems (under- and over-damped DC/AC).
• Validated algorithms using Simulink/Simscape modeling, analytical solutions, and experimental coil/Hall sensor data.
• Demonstrated application in reducing ringing in a nuclear magnetic resonance (NMR) circuit.

Main Results:

• Successfully achieved rapid step and settling times in inductive circuits across different damping conditions.
• Experimental validation confirmed the efficacy of the proposed control algorithms.
• Significant reduction in ringing observed in a standard NMR circuit using these techniques.

Conclusions:

• The presented open-loop control algorithms offer a practical solution for fast magnetic field control in inductive systems.
• These techniques are applicable to a wide range of applications requiring precise and quick magnetic field generation.
• The study provides valuable insights and tuning tricks for optimizing inductive circuit performance.