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- W4313174700 abstract "Magnetically levitated motor systems create opportunities for new applications of electromechanical power conversion where high-speed and contact-free operation are required. These systems require position sensors and control algorithms for stable levitation which often require filters to reduce feedback noise. Noisy position feedback creates challenges for high-bandwidth estimation of velocity and disturbance force; however, these unmeasured states can be helpful for high-performance control algorithms. This common problem in drives for electric motors has been solved using the Luenberger-style motion state observer. This article investigates the applicability of the observer to digitally-controlled magnetically levitated systems. First, the observer's embedded plant model is derived for discrete-time implementation. Then, it is shown that the most advantageous use-case of the observer is different for magnetically levitated systems versus rotary motor systems. Unlike motor systems, the zero-lag filtering property of observers is minimally useful, while the ability to estimate and reject disturbances yields significant performance improvements for applications that care about run-out. Comprehensive experimental results are provided on a prototype bearingless motor which validate the observer's performance versus frequency and its ability to estimate disturbance forces for use in reducing the rotor run-out. Experimental results achieve over 10× run-out reduction at low-medium speeds while also reducing control current by 50%." @default.
- W4313174700 created "2023-01-06" @default.
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- W4313174700 date "2023-03-01" @default.
- W4313174700 modified "2023-09-27" @default.
- W4313174700 title "State Observers and Run-Out Reduction for Magnetically Levitated Motor Systems" @default.
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- W4313174700 doi "https://doi.org/10.1109/tia.2022.3226134" @default.
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