Sensorless position control of a linear voice-coil transducer using sliding mode observers

Bradley C. Glenn; Chad E. Bouton

doi:10.1117/12.605469

19 May 2005 Sensorless position control of a linear voice-coil transducer using sliding mode observers

Bradley C. Glenn, Chad E. Bouton

Proceedings Volume 5757, Smart Structures and Materials 2005: Modeling, Signal Processing, and Control; (2005) https://doi.org/10.1117/12.605469
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

There are numerous applications where a voice coil actuator is used for position control and it is not desirable to have a physical position sensor for feedback. This paper proposes a technique for sensorless position estimation of a linear voice coil transducer using sliding mode observers. The method exploits the fact that some voice coil designs possess position-dependent force and back-emf parameters due to their geometrical properties. Using an observer structure that incorporates these position-dependent parameters of the transducer allows the coil position to be observed from a current measurement. The nonlinear model developed for the voice coil is validated and experimental results are presented and discussed. Observability is proven and the results are incorporated into a sliding mode position feedback control algorithm.

Citation Download Citation

Bradley C. Glenn and Chad E. Bouton "Sensorless position control of a linear voice-coil transducer using sliding mode observers", Proc. SPIE 5757, Smart Structures and Materials 2005: Modeling, Signal Processing, and Control, (19 May 2005); https://doi.org/10.1117/12.605469

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