Error analysis of efficiency estimation methods for induction motors

Herndler, B.; Barendse, Paul; Khan, Azeem

doi:10.1109/iemdc.2011.5994831

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…For a complex system, like an induction motor, the explicit expressions of the derivatives are not available; the influence coefficient of each input variable can be approximated by applying a small perturbation in the corresponding input variable and measuring the change in the output variable [23]. The RPBE method is introduced in [20], [23], and [24] as a technique that improves the results obtained from the WCE. The effects of the individual instrumentation errors are discriminately accounted for according to their corresponding influence coefficient, hence, the estimate of the measurement error is more realistic [23].…”

Section: Error Analysis and Uncertaintymentioning

confidence: 99%

“…When all error sources are added up using (58), the overall realistic error in the output variable can be obtained. In order to develop a proper uncertainty study, the actual motor efficiencies must be measured and their accuracies must be guaranteed [20], [23], [24]. In this section, the two techniques (i.e., WCE and RPBE) will be used to investigate the uncertainty of the measured and estimated motor efficiencies.…”

Section: Error Analysis and Uncertaintymentioning

confidence: 99%

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A Novel Algorithm for Estimating Refurbished Three-Phase Induction Motors Efficiency Using Only No-Load Tests

Al-Badri

Pillay

Angers

2015

IEEE Trans. Energy Convers.

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Induction motors fail due to many reasons, and many are rewound two or more times during their lifetimes. It is generally assumed that a rewound motor is not as efficient as the original motor. Precise estimation of efficiency of a refurbished motor or any existing motor is crucial in industries for energy savings, auditing, and management. Full-load and partial-load efficiency can be measured by using the dynamometer. This paper presents a novel technique for estimating refurbished induction motors' full-load and partial-load efficiencies from only no-load tests. The technique can be applied in any electric motor workshop and eliminates the need for the dynamometer procedure. It also eliminates the need for the locked-rotor test. Experimental and field results of testing eight induction motors are presented, and the degree of accuracy is shown by comparing the estimated efficiencies against the measured values. To provide the necessary credits to the proposed technique, an error analysis is conducted to investigate the level of uncertainty through testing three induction motors, and the results of uncertainty of the direct measurements and no-load measurements using the proposed technique are presented.Index Terms-Absolute error, accuracy, dc test, direct measurements, error analysis, hot temperature, induction motor, influence coefficient, nameplate, no-load test, realistic perturbation-base estimation, relative error, rewound motor, stray load loss, uncertainty, worst-case estimation.

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Section: Error Analysis and Uncertaintymentioning

confidence: 99%

Section: Error Analysis and Uncertaintymentioning

confidence: 99%

A Novel Algorithm for Estimating Refurbished Three-Phase Induction Motors Efficiency Using Only No-Load Tests

Al-Badri

Pillay

Angers

2015

IEEE Trans. Energy Convers.

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“…The second term in (15) has as the noise influence coefficient of the additive noise , which is often neglected to simplify the analysis [23], [24].…”

Section: Error and Sensitivity Analysismentioning

confidence: 99%

“…The expressions of the derivatives in (16) cannot be explicitly determined in an induction motor [23] and [24].…”

Section: Error and Sensitivity Analysismentioning

confidence: 99%

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Analysis of a Nonintrusive Efficiency Estimation Technique for Induction Machines Compared to the IEEE 112B and IEC 34-2-1 Standards

Gajjar

Kinyua

Khan

et al. 2015

IEEE Trans. on Ind. Applicat.

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International efficiency testing standards such as the IEEE 112-B and IEC 34-2-1 can determine an induction machine's efficiency accurately at the cost of hindering the machine's productivity. Alternatively, various methods used to determine a machine's efficiency in-situ do so at the cost of accuracy. This paper proposes a method that determines an induction machine's efficiency over a range of load conditions from tests conducted and centered around one thermally stable load point in the least intrusive manner possible. The results are then compared to those of the IEEE 112-B and IEC 34-2-1 motor testing standards using segregated loss analysis. It was found that despite the proposed algorithm being unable to accurately determine core losses, the efficiency of a machine can be estimated to within 0.5-2.1% and 1.1-1.7% error when compared to the IEEE 112-B and IEC 34-2-1 standards respectively over a 25-150% machine load profile (dependent upon the proposed method's implementations).

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Development and efficiency estimation of a regenerative test rig for induction motor testing

Kinyua

Khan

Barendse

2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Error analysis of efficiency estimation methods for induction motors

Cited by 6 publications

References 6 publications

A Novel Algorithm for Estimating Refurbished Three-Phase Induction Motors Efficiency Using Only No-Load Tests

A Novel Algorithm for Estimating Refurbished Three-Phase Induction Motors Efficiency Using Only No-Load Tests

Analysis of a Nonintrusive Efficiency Estimation Technique for Induction Machines Compared to the IEEE 112B and IEC 34-2-1 Standards

Development and efficiency estimation of a regenerative test rig for induction motor testing

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