Self sensing: closed-loop estimation for a linear electromagnetic actuator

Author

Hanson, Ben M. ; Brown, M.D. ; Fisher, J.

Author_Institution

Sch. of Mech. Eng., Leeds Univ., UK

Volume

2

fYear

2001

fDate

2001

Firstpage

1650

Abstract

Self-sensing is a valuable technique that allows information about position and/or force to be obtained directly from the actuator, without separate sensors. This technique has been applied to piezoceramic actuators and electromagnets for vibration control applications. This paper reports on the development of a rheometer to quantify viscoelastic bone cement; this measurement task requires a more powerful, longer stroke actuator. A new type of electromagnetic linear actuator is analytically modelled and configured as a self-sensor. Tests confirm that displacement estimation using the new actuator is accurate to 0.2mm with the actuator oscillating with a magnitude of 32mm (peak-peak). Further testing reveals that the actuator can estimate the size of an added mass to within 0.0025kg, with a load of up to 0.15kg

Keywords

biomedical equipment; closed loop systems; electric actuators; self-adjusting systems; 0.2 mm; 32 mm; closed-loop estimation; displacement; force estimation; linear electromagnetic actuator; rheometer; self-sensing; velocity estimation; Actuators; Bones; Elasticity; Electromagnetic forces; Electromagnets; Force sensors; Piezoelectric materials; Testing; Vibration control; Viscosity;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 2001. Proceedings of the 2001

Conference_Location

Arlington, VA

ISSN

0743-1619

Print_ISBN

0-7803-6495-3

Type

conf

DOI

10.1109/ACC.2001.945965

Filename

945965