Uncertainty Issues in Direct and Indirect Efficiency Determination for Three-Phase Induction Motors: Remarks About the IEC 60034-2-1 Standard

Bucci, G.; Ciancetta, Fabrizio; Fiorucci, Edoardo; Ometto, A.

doi:10.1109/tim.2016.2599459

Cited by 47 publications

(20 citation statements)

References 21 publications

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“…A hysteresis brake dynamometer Magtrol HD-815 (28Nm, 12000 rpm) provides the load torque and the measures of the mechanical speed and power. The resolution of the instruments are suitable for the computation of the efficiency by the direct method [13]. The data for each specific torque value has been collected at the relative thermal steady state of the motor, the temperature on the TEFC housing has been measured by an infrared fluke 62 thermometer on the top of the front endshield.…”

Section: Prototypes and Experimental Resultsmentioning

confidence: 99%

Experimental Comparison Between Induction and Synchronous Reluctance Motor-Drives

Villan

Tursini

Popescu

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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Section: Prototypes and Experimental Resultsmentioning

confidence: 99%

Experimental Comparison Between Induction and Synchronous Reluctance Motor-Drives

Villan

Tursini

Popescu

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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“…In coherence with the method that was traditionally adopted for the measurement of efficiency in electrical motors, this version of the standard avoids requiring a measurement of output torque, since this was quite difficult in the past before the development of high-performance torque transducers [16]. The quantification of additional losses is to be done by estimation, conventionally as 0.5% rated input electrical power, by varying as the stator current squared.…”

Section: The Indirect Methods For Efficiency Measurement In Iec Standmentioning

confidence: 99%

“…For the considered induction motor, rated P 1 is 6523.59 W. In Table 5, the additional losses, according to (16) are presented. The obtained combined uncertainty is smaller than in Table 5 because it depends only on the accuracy of the RMS current measurement.…”

Section: The Case Of the Uncertainty Propagation In The Estimation Ofmentioning

confidence: 99%

“…With the indirect method, the total losses are 705.405 W, the efficiency η 1 is 0.8870, and u c η 1 is 0.0079; by replacing the additional losses with estimated ones processed with the method in (16), the total losses are 680.210 W, the efficiency η 2 is 0.8910, and u c η 2 is 0.0066. The corrected input power is 6242.68 W, with a combined uncertainty u c (P 1 ) equal to 41.032 W.…”

Section: Effects On the Efficiency Measurementsmentioning

confidence: 99%

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The Measurement of Additional Losses in Induction Motors: Discussion about the Actually Achievable Uncertainty

et al. 2019

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In this paper, a discussion is presented concerning the combined uncertainty when measuring residual and additional losses in the efficiency evaluation of three-phase induction motors, by evaluating some experimental results obtained on a commercial motor. The IEC 60034-2-1 standard is considered, in comparison to a previous version of this standard requiring the estimation of residual losses instead of their measurement. A major goal is to investigate if the complex measurement method introduced in the present version of the standard is justified or not by processing the actually achievable uncertainty both in additional losses and in the overall efficiency measurement. Finally, some considerations are presented about additional issues concerning the classification of the tested motor, in comparison to the IE (International Efficiency) efficiency levels.

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“…In particular, the standard considers up to four classes of efficiency, and it groups motors according to their output power and number of poles. Since 1 January 2017, all motors with a rated power between 0.75 and 375 kW are required to comply with the IE3 efficiency, which is premium efficiency in International Efficiency classification [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study for the Assessment of the Measurement Uncertainty Associated with Electric Powertrain Efficiency Using the Back-to-Back Direct Method

et al. 2018

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Brushless electric motors are used intensively in the industrial automation sector due to the motors low inertia and fast response. According to the International Electrotechnical Commission, IEC 60034-2-1, the efficiency of a three-phase electric machine (excluding machines for traction vehicles) can be determined by direct or indirect techniques. In the case of small traction motors (<10 kW), direct methods are used extensively by manufacturers, even if no standard has been published or scheduled by the IEC. In this paper, we evaluated the accuracy of the (direct) back-to-back method for the estimation of the energy performance of a 3 kW brushless AC electric motor used in a light electric vehicle. We measured the efficiencies of a pair of motors and inverters, as well as the overall efficiency of the entire power train. The results showed that the methodology was sufficiently accurate and comparable with other indirect methods available in existing literature. Moreover, we developed a Simulink model that used the powertrain efficiency map as the input to perform the simulation of a standard urban driving cycle. The simulation was run 500 times to calculate the probability density function associated with the total range of the vehicle, considering the uncertainty of the efficiency that was determined experimentally. The simulation results confirmed the low deviation of the distribution standard compared to the average value of the range of the vehicle.

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Uncertainty Issues in Direct and Indirect Efficiency Determination for Three-Phase Induction Motors: Remarks About the IEC 60034-2-1 Standard

Cited by 47 publications

References 21 publications

Experimental Comparison Between Induction and Synchronous Reluctance Motor-Drives

Experimental Comparison Between Induction and Synchronous Reluctance Motor-Drives

The Measurement of Additional Losses in Induction Motors: Discussion about the Actually Achievable Uncertainty

Experimental Study for the Assessment of the Measurement Uncertainty Associated with Electric Powertrain Efficiency Using the Back-to-Back Direct Method

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