TEMPERATURE RISE IN INDUCTION MOTOR WINDINGS AS THE CAUSE OF VARIATION IN ROTATIONAL SPEED OF AN AXIAL FAN

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Živan T. SPASIĆ Milan M. RADIĆ Dragana G. DIMITRIJEVIĆ

Abstract

The paper presents results of an experimental investigation performed under controlled laboratory conditions, in order to identify real causes of variation in the rotational speed of an axial fan that can be noticed after a certain period following the start of operation. The theoretical background important for understanding the observed phenomenon is given and the hypothesis is proposed which states that the temperature rise in motor windings and a consequential rise of their resistances are responsible for such specific behavior of the axial fan. The experiment was performed on a standard test rig with a small industrial axial  fan, driven by a three-phase induction motor with the rated power of 1.5 kW. The experimental procedure is described in details, measured and calculated results are presented and appropriate conclusions are given. The obtained experimental results confirm the proposed hypothesis.

Article Details

How to Cite
SPASIĆ, Živan T.; RADIĆ, Milan M.; DIMITRIJEVIĆ, Dragana G.. TEMPERATURE RISE IN INDUCTION MOTOR WINDINGS AS THE CAUSE OF VARIATION IN ROTATIONAL SPEED OF AN AXIAL FAN. Thermal Science, [S.l.], v. 20, p. S1449-S1459, feb. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/1662>. Date accessed: 17 aug. 2017. doi: https://doi.org/10.2298/TSCI16S5449S.
Section
Articles
Received 2017-02-07
Accepted 2017-02-07
Published 2017-02-07

References

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[3] Spasić, Ž. T., et al., Variation of Operation of Low-Pressure Reversible Axial Fans Driven by Induction Motor from Start to the Steady-State, Proceedings, 15th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, Serbia, 2011, pp. 586-595
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[5] ***, IEC 60085 Electrical Insulation-Thermal Evaluation and Designation, International Electro-technical Commission, 4th ed., 2007
[6] Spasić, Ž. T., Numerical and Experimental Investigation of the Influence of the Blade Profile Shape on the Reversible Axial Fan Characteristics (in Serbian), Ph. D. thesis, University of Nis, Nis, Serbia, 2012
[7] Spasić, Ž. T., et al., Low-Pressure Reversible Axial Fan with Straight Profile Blades and Relatively High Efficiency, Thermal Science, 16 (2012), Suppl. 2, pp. S593-S603

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