Techniques for Improving Torque Performance of Three Phase Induction Motor under Single Phasing Condition Using Capacitor and Neutral Wire
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Abstract
Induction motors are widely used in industrial applications. When the induction motors lose one of their three-phase line voltages due to a faulty power supply or single-pole tripping of recloses, they become single phasing. They will continue to run, however, they will draw current more than their rated values. The motor’s torque performances are also degraded. Therefore, this paper presents a method for improving the motor performance under the loss of one phase voltage by connecting the star points between the motor and the power sources using the neutral lead. The additional capacitor is also employed to reduce the degrees of current unbalance. The experiment is conducted into four study cases: three-phase balance with no neutral connection, loss of one phase voltage, loss of one phase voltage with the neutral wire connection, and capacitor connected in series with the phase-loss winding. The study results show that the neutral wire and the additional capacitor connected in series with the phase-loss winding of motor help to improve the motor’s running torque and to reduce the unbalanced current within the acceptable level. This proposed method allows the induction motors to keep running without damage when they experience a one-phase loss of voltage.
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References
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