Piecewise affine virtual sensor: a case study - estimation of stepping motor current from long distances

Alberto Oliveri, Mark Butcher, Alessandro Masi, Marco Storace

Abstract

In this paper we propose the application of a piecewise affine virtual sensor for the estimation of the motor-side current of hybrid stepper motors, which actuate the LHC (Large Hadron Collider) collimators at CERN. The estimation is performed starting from measurements of the current in the driver, which is connected to the motor by a 720 m long cable. Measured current is therefore affected by noise and ringing phenomena. The proposed method does not require a model of the cable, since it is only based on measured data. A circuit architecture suitable for FPGA implementation has been designed and the effects of fixedpoint representation of data are analyzed.

Keywords

virtual sensors, piecewise affine functions, large hadron collider

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IMEKO-TC4-2014-393.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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