Graduate Student Researcher
Ann Arbor, Mi
• Used new actuator figure of merit (referred to as the performance metric (PM) throughout M.S. thesis) to optimize design of moving magnet actuator (MMA) for integration in desktop-size, single-axis, flexure-based, MMA-driven nanopositioning system (PM value of 15.4 [√(Hz) /√(kg)] achieved in fabricated design).• Identified PM via analysis of motion system’s dynamics in context of control system design for high performance motion systems; found that PM bounds simultaneous large range, high speed, and high motion quality (accuracy, precision, and resolution) in single-axis, flexure-based, MMA-driven motion systems.• Clarified utility of dynamic actuator constant (actuator figure of merit prior work suggested one maximize to maximize overall motion system performance) as figure of merit with which to compare relative difference in performance between MMA designs; identified fundamental upper limit to maximum achievable dynamic actuator constant of a Lorentz force actuator (using best available materials, max=62.8 [√(Hz)]).• Developed methodical evaluation process to identify variation of recently introduced concentric coil, radial magnet (CCRM) MMA architecture with highest potential performance (four actuator level design specifications: (1) long range, (2) high force-stroke uniformity, (3) reasonably small off-axis attraction forces between permanent magnet and back iron, and (4) large PM value).• Developed brute-force search optimization process that quickly identifies optimal (i.e. highest PM value) CCRM MMA geometry in given design space (using closed form approximation of PM (derived via magnetic circuit analysis) to identify approximately optimal design and FEA simulations to hone in on optimal design).