INVESTIGATION ON THE IMPEDANCE-FREQUENCY-RESPONSE FOR A DYNAMIC BEHAVIOUR DESCRIPTION OF ELECROMAGNETIC FORCE COMPENSATED LOAD-CELLS

F.Hilbrunner, H. Weis, R. Petzold, T. Fröhlich, G. Jäger

Abstract

In this paper, a method for deriving significant parameters for the description of the dynamic behaviour of electromagnetic force compensated load-cells (EMC) from its impedance-frequency-response is presented. With these parameters, the dynamical behaviour of a loadcell can be depicted and classified near its main resonance frequency, or by going the inverse way the load-cell can be designed based on the favored parameters to fulfill the desired criteria concerning the dynamical behaviour. This method is based on the estimation of parameters describing the behaviour of electrodynamic speakers, called Thiele- Small-Parameters, which is state of the art for designing loudspeakers. It will be demonstrated that the controller design for the EMC load-cell can be based on the derived parameters.

Keywords

dynamic EMC-Balance, parameter estimation, impedance-frequency-response, dynamic mass measurement, Thiele-Small-Parameters, controller design

Download

IMEKO-WC-2012-TC3-O21.pdf

DOI

-

IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

Back to the proceedings