Q3: A 480 V, 250 hp, 60 Hz, four Poles, Y connected induction motor has the parameters in ohms, per phase and referred to the stator side, given in the table below. R=0.635 X=1.105 Neglect rotational and core losses. If the motor is taking from the source 111.1 A and a power of 70.1 kW, determine: A. What is the speed of the motor, n, in rpm? B. What is the torque of the load under these conditions, in N.m? C. Is the motor operating in its stable (to the right Tmax) region? R=0.327 X-0.463 X-25.7

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Q3:
A 480 V, 250 hp, 60 Hz, four Poles, Y connected induction motor has the parameters
in ohms, per phase and referred to the stator side, given in the table below.
R1=0.635
R2=0.327
X;-0.463
X=1.105
Neglect rotational and core losses. If the motor is taking from the source 111.1 A and
a power of 70.1 kW, determine:
A. What is the speed of the motor, n, in rpm?
B. What is the torque of the load under these conditions, in N.m?
C. Is the motor operating in its stable (to the right Tmux) region?
D. How much external additional rotor resistance should be added through slip
rings and brushes to bring the maximum torque to stand-still conditions?
E. Draw the circuit equivalent and torque curve?
X-25.7
Transcribed Image Text:Q3: A 480 V, 250 hp, 60 Hz, four Poles, Y connected induction motor has the parameters in ohms, per phase and referred to the stator side, given in the table below. R1=0.635 R2=0.327 X;-0.463 X=1.105 Neglect rotational and core losses. If the motor is taking from the source 111.1 A and a power of 70.1 kW, determine: A. What is the speed of the motor, n, in rpm? B. What is the torque of the load under these conditions, in N.m? C. Is the motor operating in its stable (to the right Tmux) region? D. How much external additional rotor resistance should be added through slip rings and brushes to bring the maximum torque to stand-still conditions? E. Draw the circuit equivalent and torque curve? X-25.7
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