Evaluation of Stray Load Loss in Induction Motors With a Comparison of Input–Output and Calorimetric Methods

Bradley, K.J.; Cao, Wenping; Arellano-Padilla, J.

doi:10.1109/tec.2006.879674

Cited by 40 publications

(9 citation statements)

References 10 publications

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“…The accuracy with which a calorimeter measures power is thus higher (Cao et al, 2010a). Bradley et al (2006) points out that even small errors in the inputoutput power measurement lead to considerable error in efficiency calculations, especially for those machines with expected efficiency greater than 97 %. This is a deficiency in the difference method; and the only way to overcome it is if the accuracy of the power measurements are rather (unrealistically) high (Aarniovuori et al, 2015a).…”

Section: Calorimetric Measurementmentioning

confidence: 99%

“…Error in loss measurement, calorimeter vs. input-output method. Adapted from (Bradley et al, 2006) . Rasilo et al, 2012;Kosonen et al, 2013;Aarniovuori et al, 2015a andKanchan et al, 2015).…”

Section: Calorimetric Measurementmentioning

confidence: 99%

“…To measure segregated machine power loss with a calorimeter is not easy, as the heat source would need to be isolated within the calorimetric chamber. Bradley et al (2006) calorimetrically measured the losses in motors of 11-150 kW to verify the input-output loss measurement, with the objective of quantifying the stray load/ additional losses. This work reiterates that the calorimetric method is of superior precision in loss estimation of electrical machines.…”

Section: Calorimetric Measurementmentioning

confidence: 99%

See 2 more Smart Citations

Design of Water-Cooled Calorimeter for Electric Motor's Power Loss Measurement

Nair

Daryabin

Jannasch

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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Section: Calorimetric Measurementmentioning

confidence: 99%

Section: Calorimetric Measurementmentioning

confidence: 99%

Section: Calorimetric Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Design of Water-Cooled Calorimeter for Electric Motor's Power Loss Measurement

Nair

Daryabin

Jannasch

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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show abstract

“…For other load points, SLLs are assumed to vary as the square of the stator current. The problem is that this level of SLLs is atypically low for most small machines (below 150 kW) and this approach had been questioned by many authors in the past [8][9][10][11][12][13]. In the authors' previous study on 23 new induction machines rated between 5.5 and 225 kW, the ratios of SLL to input power were found to be within the range of 0.1-1.8%.…”

Section: Testing Standardsmentioning

confidence: 99%

Assessment of iec 60034-2-1 in determining induction machine efficiency

Cao

Huang

French

et al. 2010

Euro. Trans. Electr. Power

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This paper evaluates the efficiency of induction machines and measurement uncertainties arising from applying two editions of the International Electrotechnical Commission (IEC) testing standard in industry. Machine testing standards vary in methodology, procedure and required instrumentation accuracy, therefore leading to significant discrepancies in the experimentally determined efficiency for the same induction machine tested to different standards as well as by different testing personnel. Five new induction machines with ratings between 7.5 and 150 kW are carefully tested using IEC 60034-2 (old edition), 60034-2-1 (new edition) and Institute of Electrical and Electronics Engineers (IEEE) standard 112 method B which is used as a benchmark. Furthermore, a 30 kW calorimeter is employed to validate power loss measurements and a realistic uncertainty estimation (RUE) is adopted to assess associated measurement uncertainties in power losses and efficiency, and then to assess the standard methods. Experimental results and uncertainty analysis confirm that IEC 60034-2-1 standard has improved over its previous version in defining a set of higher instrumentation accuracy, a more detailed testing procedure and more accurate models for core loss and particularly stray load loss (SLL). Overall, calorimetric methods justify the effectiveness of IEC 60034-2-1 in terms of providing reliable power losses and efficiency. Finally the need for a unified international induction machine testing standard is highlighted.

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“…It should be pointed out that these uncertainty analyses focus on instrumentation errors only. In practice, the overall measurement errors are generally greater and mainly due to human factors [20].…”

Section: Uncertainty Levelsmentioning

confidence: 99%

Comparison of IEEE 112 and New IEC Standard 60034-2-1

Cao

2009

IEEE Trans. Energy Convers.

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This paper describes a comparative study of induction motor testing standards IEEE 112 and newly published IEC 60034-2-1, primarily used in the United States and Europe, respectively. IEC 60034-2-1 has been refined from its earlier version IEC 60034-2 with reference to the IEEE 112. Six induction motors are tested following the two standards and the results are compared with regard to their instrumental accuracy and testing procedures. Power loss results are validated by the calorimetric method. A quantitative method is devised to evaluate the measurement uncertainty that can be interpreted into an efficiency deviation by quadrature addition. This paper is aimed to provide a guideline on interpreting the measured machine efficiency values using these standards and to validate the new IEC standard.

show abstract

Evaluation of Stray Load Loss in Induction Motors With a Comparison of Input–Output and Calorimetric Methods

Cited by 40 publications

References 10 publications

Design of Water-Cooled Calorimeter for Electric Motor's Power Loss Measurement

Design of Water-Cooled Calorimeter for Electric Motor's Power Loss Measurement

Assessment of iec 60034-2-1 in determining induction machine efficiency

Comparison of IEEE 112 and New IEC Standard 60034-2-1

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