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Volume 46 (1995), issue 2

Application of Hamm’s approximate method of electric power determination for transport means research


This paper presents Hamm's approximate method of determination of the consumed electric energy in three-phase asynchronous induction electric motors. The method gives brief and sufficiently exact information for a selection of advisable technical factors in working conditions. The basis of this approximate method is dependence of power factor cos φ upon electric motor load. Using empiric data, Hamm has developed a diagram for determination of electric power on the basis of measured current for three characteristic values of the power factor (cos φ = 0.7; cos φ = 0.8; cos φ = 0.9). The method is illustrated with a practical example where specific consumed electric energy of a pneumatic and a mechanical conveyor is determined. Results of the research have confirmed that mechanical conveyor is more favourable than pneumatic conveyor with respect to power.


Faculty of Forestry and Wood Technology

DRVNA INDUSTRIJA Scientific Journal of Wood Technology

ISSN 0012-6772 (Print) / ISSN 1847-1153 (Online)

Faculty of Forestry and Wood Technology University of Zagreb, Svetošimunska 25, 10000 Zagreb, Hrvatska - Croatia
Tel: +3851 2352 430, E-mail:
Editor-in-Chief: Prof. Ružica Beljo-Lučić, Ph.D. E-mail:
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