Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor

Singh, Shashi Bhushan; Singh, Asheesh Kumar

doi:10.2478/jee-2013-0004

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…This results in torque pulsation, speed reduction, increases in machine loss, derating of the machine etc. Additionally, due to small value of negative sequence impedance

false(Z_{sn} false)

, negative sequence voltage generates large negative sequence current and consequently increases of motor losses and reduction in motor life [13].…”

Section: Influence Of Pufs On Im Performancementioning

confidence: 99%

“…In [12], Singh and Singh used complex current unbalance factor (CCUF) for measuring the degree of unbalance in current, which depends on magnitude and unbalanced angle of current. While in [13], Singh and Singh used impedance unbalance factor with CVUF to discuss the steady‐state performance of IM under supply voltage unbalance condition.…”

Section: Introductionmentioning

confidence: 99%

“…PUFs are divided into three factors: output PUF

false(K_{normalp} false)

, reactive PUF

false(K_{normalQ} false)

, and apparent PUF

false(K_{normals} false)

. To analyse the effect of PUFs on the performance of IM with unbalanced voltage supply symmetrical component approach is used [13]. Positive and negative sequence equivalent circuits of IM are presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Approach to measure the degree of the unbalanced power in induction motor for energy‐efficient use

El-Kharashi

Massoud

2017

J. eng.

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“…This results in torque pulsation, speed reduction, increases in machine loss, derating of the machine etc. Additionally, due to small value of negative sequence impedance

false(Z_{sn} false)

, negative sequence voltage generates large negative sequence current and consequently increases of motor losses and reduction in motor life [13].…”

Section: Influence Of Pufs On Im Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…PUFs are divided into three factors: output PUF

false(K_{normalp} false)

, reactive PUF

false(K_{normalQ} false)

, and apparent PUF

false(K_{normals} false)

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Approach to measure the degree of the unbalanced power in induction motor for energy‐efficient use

El-Kharashi

Massoud

2017

J. eng.

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“…Electric motors are also a load sensitive to voltage unbalance, which can also be accompanied by voltage magnitude variations. Studies relating both phenomena and their negative impacts on electric motor's torque, power factor, and efficiency have been presented in [14], [16], [26]- [32].…”

Section: Introductionmentioning

confidence: 99%

Assessing Energy Efficiency and Power Quality Impacts Due to High-Efficiency Motors Operating Under Nonideal Energy Supply

Tabora¹,

Tostes

Bezerra

et al. 2021

IEEE Access

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The search for more competitive equipment in the global market has led to the implementation of new materials and technologies in the search for greater energy efficiency. This is certainly a guideline followed by the electric motor industry that has introduced new technologies in rotating machines, such as the permanent magnet motor, evolving into increasingly efficient motor classes. However, subjecting these efficient motors under nonideal electric grid power conditions, such as voltage unbalance, can cause these efficient machines to generate additional distortions in the voltage and current waveforms, which in turn not only affect the performance of electric motors themselves but also that of the electrical system in general. This work presents a comparison between energy efficiency gain and the corresponding power quality degradation through a detailed harmonic analysis of the effects of voltage harmonics and voltage unbalance in three 0.75-kW electric motors classes: IE2, IE3, and IE4, The results show that for increasing percentages of a specific harmonic distortion, other harmonics are also increased in the higher efficiency electric motors sample analyzed, and similar responses were also observed for large percentages of voltage unbalance, mainly in the line-start permanent magnet motor class IE4. The results achieved are interesting but rigorously reflect only the tested motor sample and cannot be generalized to all motors, in other power ranges, of the respective motor classes tested. For generalization, exhaustive tests must be accomplished to formulate general conclusions according to the electric motors' classes commercially available.

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“…Due to the wide application of IMs in different technological processes and installations, the robustness of these motors against any disturbance such as voltage fluctuations is of high significance. Therefore, it is very important to carry out studies about the effects of power quality issues on the behavior of IMs in detail from the theoretical and practical point of view (Singh and Singh, 2013). The previous research studies show that the voltage fluctuations affect the behavior of the IM (Baptista et al , 2010; Bucci et al , 2005; Ghaseminezhad et al , 2009, 2012, 2013, 2017a, 2019, 2021; Gnaciński and Pepliński, 2014; Gnacinski et al , 2019a, 2019b; Medeiros and de Oliveira, 2002; Tennakoon et al , 2008; Zhao et al , 2012).…”

Section: Introductionmentioning

confidence: 99%

High torque and excessive vibration on the induction motors under special voltage fluctuation conditions

Ghaseminezhad

Doroudi²,

Hosseinian

et al. 2021

COMPEL

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Purpose Voltage fluctuation (flicker) is a power quality disturbance that can produce several undesirable effects on industrial equipment. This paper aims to present the methodology and results of investigations undertaken to examine the speed and torque of an induction motor (IM) under voltage fluctuation conditions. Design/methodology/approach The IM response to different characteristics of voltage fluctuations is presented. It will be shown that under a special condition the IM torque can even reach two times the rated torque. To show how this occurs, a qualitative discussion is given on the motor response by linearized equations. Findings The small-signal analysis was used to determine the frequency which leads to maximum speed fluctuations. It was shown that, if the motor is excited with a modulation frequency (resonant frequency) which is one of its natural frequencies (modes), the mode will act as a fluctuating amplifier and greatly increase the amplitude of torque and speed fluctuations. Sensitivity analysis is also carried out to evaluate the influence of motor parameters on the resonance frequency. The results show that the resonance frequency is not affected at all by the changes in magnetizing reactance. This has been shown that magnetic saturation does not have any impact on the resonance frequency. The most effective parameters are rotor and stator resistances. Originality/value With the increasing popularity and use of arc furnace loads in the metallurgy industry and due to the wide application of large IMs in the industry, it is possible that the frequency of torque pulsation locates near a natural frequency and then will create an oscillation with a large magnitude, potentially leading to accelerated fatigue or severe damage of shaft. However, if this phenomenon occurs in industries, the resonance frequency must be filtered from the input voltage. Experimental results on a 1.1 kW, 380 V, 50 Hz, 2 pole IM are used to validate the accuracy of simulation results.

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Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor

Cited by 12 publications

References 16 publications

Approach to measure the degree of the unbalanced power in induction motor for energy‐efficient use

Approach to measure the degree of the unbalanced power in induction motor for energy‐efficient use

Assessing Energy Efficiency and Power Quality Impacts Due to High-Efficiency Motors Operating Under Nonideal Energy Supply

High torque and excessive vibration on the induction motors under special voltage fluctuation conditions

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