NEW METHOD FOR ROTOR TEMPERATURE ESTIMATION

M. Maximini, H.-J. Koglin, M. Igel

Abstract

This paper presents a new method for observing the rotor temperature of high-power squirrel cage induction machines in measurable variables. The method is based on the fact that the rotor resistance depends on the actual rotor temperature. The main problem is to separate the changes in the rotor resistance due to temperature and skin effect. By comparing the input impedance with a known circle diagram measured in the start-up phase, it is possible to calculate changes in the rotor temperature. Further analyses also make it possible to obtain the absolute rotor temperature at any time.

Keywords

induction machine, thermal protection, rotor temperature, differential measurement

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IMEKO-WC-2000-TC12-P313.pdf

DOI

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IMEKO TC

TC12 - Temperature and Thermal Measurements

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