) Sketch the phasor diagram of this motor, and find the values of Ia, and Ea. b) Assume that the shaft load is now increased to 36kW. Sketch the behaviour of the phasor diagram in response to this change. c) Find Ia, and Eaf after the load change. What is the new power fac
A 208V, 45hp, 0.8pf leading, Y- connected 60Hz cylindrical rotor synchronous motor has a synchronous reactance of 2.5Ω and a negligible armature resistance. Its friction and windage losses are 1.5kW. Initially, the shaft is supplying an 11kW load at 0.8 power factor (leading).
a) Sketch the phasor diagram of this motor, and find the values of Ia, and Ea.
b) Assume that the shaft load is now increased to 36kW. Sketch the behaviour of the phasor diagram in response to this change.
c) Find Ia, and Eaf after the load change. What is the new power factor of the machine?
d) Calculate the percentage change of the rotor excitation current (If) that would bring the power factor to the unity.
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 4 images
