Self-Sensing Dual Push-Pull Solenoids using a Finite Dimension Flux-observer

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Position feedback in a solenoid actuated system typically requires a position sensing device such as a Linear Variable Differential Transformer (LVDT). The goal of self-sensing is to obtain position information directly from the electrical signals to the solenoid actuators, thus obviating the additional cost and footprint of a LVDT or another displacement sensing device. Such measurement is possible due to the position dependence of electrical inductance in the solenoids. This paper proposes a finite-dimensional nonlinear observer for the magnetic flux linkage for the solenoids. Once the flux linkage has been identified, the solenoid position can be determined via the position-inductance relationship. The algorithm has been adapted for actual solenoids modeled as a third-order system that includes two eddy current modes accurate up to 1024 Hz. Implementation on commercially low-cost solenoids (with 5mm stroke) has demonstrated RMS position accuracy up to 0.061mm. The ability to self-sense accurately can enable solenoids to be deployed at low-cost for many motion control applications besides hydraulic valves.

Original languageEnglish (US)
Title of host publication2020 American Control Conference, ACC 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781538682661
StatePublished - Jul 2020
Event2020 American Control Conference, ACC 2020 - Denver, United States
Duration: Jul 1 2020Jul 3 2020

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619


Conference2020 American Control Conference, ACC 2020
Country/TerritoryUnited States


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