A synchronous motor with delta conductive coils is fed from a 480V source. Its synchronous impedance is 102, the product winding resistance is neglected, and the ferrous losses and friction losses are neglected as well. Find the following: A) If it is running a 400hp load at a power factor of 0.85 lead, find the value and angle of E, and Ip B) If the field current increases by 10%, explain the motor behavior using the vector diagram. (C) Find the values of E, I, and I after increasing the load (D) Calculate the power factor after increasing the load.

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A synchronous motor with delta conductive coils is fed from a 480V source. Its
synchronous impedance is 102, the product winding resistance is neglected, and the
ferrous losses and friction losses are neglected as well. Find the following:
A) If it is running a 400hp load at a power factor of 0.85 lead, find the value and
angle of Ep and Ip
B) If the field current increases by 10%, explain the motor behavior using the
vector diagram.
(C) Find the values of Eph, Iph, and I after increasing the load
(D) Calculate the power factor after increasing the load.
Transcribed Image Text:A synchronous motor with delta conductive coils is fed from a 480V source. Its synchronous impedance is 102, the product winding resistance is neglected, and the ferrous losses and friction losses are neglected as well. Find the following: A) If it is running a 400hp load at a power factor of 0.85 lead, find the value and angle of Ep and Ip B) If the field current increases by 10%, explain the motor behavior using the vector diagram. (C) Find the values of Eph, Iph, and I after increasing the load (D) Calculate the power factor after increasing the load.
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