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

Al-Badri, Maher; Pillay, Pragasen; Angers, Pierre

doi:10.1109/tec.2014.2361258

Cited by 45 publications

(15 citation statements)

References 20 publications

(21 reference statements)

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“…Among them, it can be highlighted the methods based on induction motor slip [9], [10], current [11], equivalent circuit [3], [12], [13], and air-gap torque (AGT) [14]- [19].…”

mentioning

confidence: 99%

Induction Motor Efficiency Evaluation Using a New Concept of Stator Resistance

Salomon

Sant’Ana

Silva

et al. 2015

IEEE Trans. Instrum. Meas.

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This paper presents an air-gap torque (AGT)-based method for efficiency estimation of induction motors. A new concept of stator resistance that includes the mechanical losses effect is proposed. This new stator resistance is estimated through a particle swarm optimization approach based on the stator flux equations and minimization of torque error at the rated operation point. Then, the obtained stator resistance is used in the AGT equations to estimate the shaft torque and then the efficiency. Moreover, the rotor speed is estimated using induction motor current signature analysis. Thus, the proposed methodology for induction motor efficiency estimation relies only on line currents, line voltages, and nameplate data, being appropriate for in-service applications. Finally, the simulation and experimental results are presented to validate the proposed method at different load conditions.

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“…Among them, it can be highlighted the methods based on induction motor slip [9], [10], current [11], equivalent circuit [3], [12], [13], and air-gap torque (AGT) [14]- [19].…”

mentioning

confidence: 99%

Induction Motor Efficiency Evaluation Using a New Concept of Stator Resistance

Salomon

Sant’Ana

Silva

et al. 2015

IEEE Trans. Instrum. Meas.

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“…The eddy current loss of rotor end-rings is assumed to be same to simplify the loss calculation. The total losses P Load l of the induction motor at full-load condition can be defined by: (1) where P Load 1copper is the copper loss of the stator windings under full-load conditions, P NoLoad iron is the no-load core loss, P Load 2cageF is the fundamental eddy current loss of the rotor squirrel cage under full-load, P Load s is the full-load stray loss and P m is the mechanical loss. The mechanical loss P m can be calculated by an empirical equation [21].…”

Section: Full-load Performance Calculationmentioning

confidence: 99%

“…Energy issues have caused motor designers, manufacturers and users to pay more attention to efficiency when applying electric motors to production and daily life, as they consume roughly two-thirds of all the electrical energy used by industrial or commercial applications in industrialized countries [1]. Three-phase squirrel-cage induction motors are one of the most widely used motor types in various fields [2][3][4], therefore it is extremely meaningful to increase the efficiency of this kind of motor. models are used in this paper because the commercial measures concerned, such as changing the type of stator windings and the air gap length, have no important influence on end-winding field.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Methodology for Analyzing the Performance of Induction Motors with Efficiency Improvement by Specific Commercial Measures

Lee

Kirtley

et al. 2019

Energies

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This paper presents a hybrid methodology to analyze the commercial measures of changing stator windings and adjusting air gap length to upgrade efficiency of typical three-phase direct-on-line induction motors with die-cast copper rotor (DCR). The calculation is carried out through combining the time-stepping and time-harmonic finite element analysis (FEA) and the circuit equivalent circuit model. Typical full-load performance of stator windings with different air gap lengths are computed by MATLAB invoking the 2D transient and eddy current field analysis in ANSYS/MAXWELL. Then, MATLAB scripts about post-processing of the FEA results are used to obtain the full-load running performance including the loss distribution and circulating current. The MATLAB scripts of circuit model built based on the FEA results is used to compare the overload and starting performance. After that, four stators with the four windings and three DCRs with different air gap of an 11 kW motor are fabricated and tested to validate the calculations. By comparing results from both calculations and measurements, it is shown that the factors of stator windings and air gap length can effectively improve the efficiency of the 11 kW DCR induction motor without the addition of extra materials. The motor with the 11/12 pitch Y-∆ series winding and 0.6 mm air gap has the best performance, in terms of efficiency, overloading capability and starting performance. Its efficiency can increase from 90% to the highest 92.35% by sole adjustment of stator winding and air gap length.Many technical measures have been investigated for improving the efficiency of induction motors. The higher efficiency can usually be achieved by increasing the active materials, such as increasing the stack length [5,6], in induction motors. Another measure of upgrading materials such as premium electrical grade lamination steel is used for decreasing core losses and Ohmic losses [6][7][8].The efficiency can also be improved by enhancing the performance of cooling and bearing systems to reduce the mechanical losses [7] and improving cooling performance to make Ohmic losses less significant [9]. These methods either rise the raw material cost or increase manufacturing complexity. Although geometry optimization techniques [10][11][12][13][14][15][16] can be used to increase the efficiency of induction motors without increasing the active materials, this technique ends up producing a different design from the original one. Consequently, a new stator and rotor punching mold is required and additional cost results. It can be seen that in practice these measures can only be used to design a new motor, therefore many manufacturers have paid more attention to ways of increasing the efficiency of their induction motors with the least cost. That means the techniques should change construction or parameters of the existing motors as little as possible. Die-cast copper rotor (DCR) technology that involves the development of heated nickel-base alloy dies presents a potential route to design hi...

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“…as presented in equation (23), is used as the magnetization admittance in (15), (16) and (18) for the series magnetization circuit. The goal of optimization is to minimize the error between the measured and estimated quantities defined by the following functions:…”

Section: ( )mentioning

confidence: 99%

“…Steady state methods use simplified motor models to solve the parameter estimation problem 194 but require multiple tests measurements at different loading conditions. Optimization techniques that are inspired by the phenomenon of natural evolution and Swarm Intelligence (SI) have been applied for IM parameter estimation [15][16][17]. These methods rely only on measurements of the motor terminal voltages and currents under steady state operation.…”

Section: Introductionmentioning

confidence: 99%

A parameter estimation algorithm for induction machines using Artificial Bee Colony (ABC) optimization

Aminu

2019

Nig. J. Tech.

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Conventionally, parameters of the Induction Motor (IM) are determined using the standard noload and locked rotor test. Performing the no-load test is simple and involved running the machine uncoupled to a load, while measuring the power, voltage, current and shaft speed at different voltage test points. On the other hand, the locked rotor test requires full control of the rotor mechanically in the locked condition before measurements are taken. This paper presents a method for estimating the parameters of IMs without the need for the no-load and locked rotor tests. The method is based on optimization approach using a relatively new swarm based algorithm called the Artificial Bee Colony (ABC) optimization. Two different equivalent circuits are implemented for the parameter estimation scheme; one with parallel and the other with series magnetization circuit. Parameters of a standard 7.5kW IM are estimated using the measured and estimated stator current, input and output power and the power factor. Based on the experimental results obtained, the optimization method using the ABC algorithm gave accurate estimates of the IM parameters when compared to the reference parameters determined using the IEEE standard 112-2004. The maximum errors of -13.730% and 2.249% are obtained for the parallel and series equivalent circuits respectively.

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

Cited by 45 publications

References 20 publications

Induction Motor Efficiency Evaluation Using a New Concept of Stator Resistance

Induction Motor Efficiency Evaluation Using a New Concept of Stator Resistance

A Hybrid Methodology for Analyzing the Performance of Induction Motors with Efficiency Improvement by Specific Commercial Measures

A parameter estimation algorithm for induction machines using Artificial Bee Colony (ABC) optimization

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