scholarly journals Theoretical and Experimental Investigation of the Supply Voltage Unbalance Effects on Squirrel Cage Induction Motors

2019 ◽  
Vol 4 (2) ◽  
pp. 51-60
Author(s):  
Fatma Zohra DEKHANDJI ◽  
Hamid BENTARZI
Keyword(s):  
Experimental Investigation ◽  
Analytical Study ◽  
Induction Motors ◽  
Supply Voltage ◽  
Factor Model ◽  
Power Losses ◽  
Voltage Unbalance ◽  
Squirrel Cage ◽  
Current Unbalance ◽  
Copper Losses

Voltage unbalance is one of the power quality problems causing a lot of ill effects on induction motors. These are namely: Overheating, line-current unbalance, derating, torque pulsation, and inefficiency. The objective of the present work is to assess and quantify the effects of voltage unbalance on induction motors using both theory and experimentation. The analytical study is performed using the complex voltage unbalance factor model of this problem. The work deals specifically with the influence of the variations in the complex angle of the voltage unbalance factor on the stator and rotor currents, stator and rotor copper losses and total losses. The experimental investigation is carried out using an apparatus that measures currents, torque and power losses.

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

2013 ◽  
Vol 64 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Shashi Bhushan Singh ◽  
Asheesh Kumar Singh
Keyword(s):  
Steady State ◽  
Performance Assessment ◽  
Induction Motor ◽  
Supply Voltage ◽  
High Sensitivity ◽  
Positive Sequence ◽  
Voltage Unbalance ◽  
Precise Assessment ◽  
Copper Losses ◽  
Steady State Performance

This paper presents precise assessment of steady-state performance of induction motor (IM) operating under voltage unbalance. The variation of two voltage unbalance factors viz. complex voltage unbalance factor (CVUF) and impedance unbalance factor (IUF) with positive sequence voltage component, reveals that degree and manner of unbalance in supply voltage is exactly reflected in CVUF and IUF, respectively. On this basis, it is shown that for the precise assessment of IM performance, knowledge of both, manner (IUF) and degree (CVUF) of unbalance is important. Further, effect of angle of unbalance, on the performance of the IM and voltage pattern is analyzed. Results depict high sensitivity of derating factor and peak copper losses to this angle. Thus, it should be included along with unbalance factors for the precise and complete performance assessment of IM.

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