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Three-phase motors can draw current in the common leg due to an imbalance in the phase currents, often caused by unequal loads on each phase or faults in the motor windings. Additionally, issues like phase loss, improper connections, or variations in supply voltage can lead to increased current draw in the neutral or common leg. This condition can result in overheating and reduced efficiency, potentially damaging the motor if not addressed promptly. Proper monitoring and balancing of the load across phases are essential for optimal motor performance.

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1mo ago

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Why there is 180 degrees phase shift in common emitter amplifier?

In the common emitter amplifier, an increase of base-emitter current causes a larger increase of collector emitter current. This means that, as the base voltage increases, the collector voltage decreases. This is a 180 degree phase shift.


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Delta motors should have more starting current than Wye (Star) motors because Delta motors have two windings to take current per phase -- they are wired Phase to Phase. Star motors have only one winding per phase -- they are wired Phase to Neutral.


How many percent will be the starting current for motor?

Motor starting current is typically 5-7 times the rated current of the motor. (For three phase induction motors)


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Three phase motors are motors which operate under three phase supply.Each phase is displaced from one another by 120 degrees.It produces three fluxes which are also 120 degrees displaced.


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It is more economical especially for running motors. Most motors start much better with 3 phase service. It also takes less current than single phase for a motor to run, therefore the power meter spins less for electrical cost.


How do single phase motors work?

the working principle of single phase induction motor is similar to the three phase induction motor, when we supply is given to the single phase induction motor a revolving field set up in the stator which produces a torqe air gap between north pole and south pole and rotor picks up speed


Revolving field theory of single phase induction motors?

The revolving field theory of single-phase induction motors suggests that a rotating magnetic field created by current flowing through two windings (main and auxiliary or starting winding) produces a starting torque in the rotor. This theory explains how single-phase motors can operate without the need for a separate rotating magnetic field, as in three-phase motors, by using a split-phase or capacitor start design to generate a rotating magnetic field.


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1. 3 phase is more efficient for electric motors. 2. Electric motors start easier with 3 phase. 3. Less current draw 4. Less heat is produced that is waste.


What do you mean lagging in electrical?

Lagging means the current is out of phase, lagging behind, the voltage. This occurs when there is inductive reactance in the circuit, such as with motors and transformers.


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