Comparison of Standards for Determining Losses and Efficiency of Three-Phase Induction Motors

Abstract

The efficiency of induction motors has emerged as having the biggest potential in saving energy consumption. This is important to South Africa where energy saving has risen as a major concern. This paper looks at the different motor efficiency standards that are available and attempts to compare them. The paper discusses results obtained from tests done on a 3kW high efficient motor. Three standards used were the CSA-390 a Canadian standard, IEEE 112 an American standard and the new European standard, the IEC 61971. Results show that the IEEE and CSA-390 produce higher efficiencies than the IEC standards. The reasons for this are discussed. The effects of equipment accuracy and supply harmonics are discussed in brief. A suggestion for a South African Standard with aspects drawn from the standards is put down as the present SANS IEC 60034-2 (1972) is outdated.

A Comparative Analysis of Performance Characteristics of 2.2 kW 3 Phase Induction Motor using DAR and DCR Technology

“…The standards differ mainly in their treatment of the stray losses in an induction machine [16,17]. A detailed comparison of the different efficiency results between the standards was presented in [18]. The Indian standard IS 12615: 2004 was used in the research related to this paper.…”

Optimization of a Three-Phase Induction Machine Using Genetic Algorithm

“…The common needs of different size companies to reduce the electricity consume and the costs lead to the use of higher efficiency induction motors. Other consequences like the reduction of CO 2 emission are taken into account too [2,3]. The electrical machines are the main consumers in the industrial sector with an electrical consumption up to 70% of the total consumed energy.…”

“…In the last years several studies demonstrated the potential energy saving in the electrical machines can be estimated at about 20% -25%. [4] For this reason the International Electrotechnical Commission (IEC) promulgated the new set of rules IEC 60034-30 in 2007 [2]. The aim of this set of rules is to lead to an unification of the efficiency energetic classes with the scope to make clear the difference among the rules active in the different EU countries [3].…”

Influence of the sinusoidal supply frequency on the induction motor stray load losses

“…From smaller companies up to bigger multinationals, the target is to reduce the electric energy costs by higher efficiency induction motors [6], [7]. As a consequence, this approach leads not only to a reduction of the energetic bill but also to a reduction of the CO 2 emissions, with solid advantages for the ambient [8]- [ 10].…”