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Application of standard and modified Eh-Star test method for induction motor stray load losses and efficiency measurement

Author(s): Koprivica Branko | Božić Milos | Rosić Marko | Bjekić Miroslav

Journal: Serbian Journal of Electrical Engineering
ISSN 1451-4869

Volume: 9;
Issue: 3;
Start page: 377;
Date: 2012;
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Keywords: induction motor | stray load losses | Eh-Star method | energy efficiency | LabVIEW

The aim of this paper is to present the application of one simple and accurate method for the measurement of stray load losses (additional load losses) in induction machines. That is the Eh-Star method given in the IEC 60034-2-1 standard. In this paper the theoretical background of the method and the measurement procedure have been explained. All measurements have been performed using modern measurement systems based on a personal computer, data acquisition cards and LabVIEW software. According to the measured results for the stray load losses, the efficiency of the induction motor has been calculated. The efficiency obtained has been compared with the IEC standard efficiency classes, in order to determine the efficiency class of the tested motor. Additionally, measurements have been performed using the modified Eh-Star method. The results obtained have been compared with those obtained using the Eh-Star method. The advantages and disadvantages of both methods have been analyzed in this paper.
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