Page 313 - Solutions Manual to accompany Electric Machinery Fundamentals

C-4. If the machine in Problem C-1 is running as a motor at the rated conditions, what is the maximum torque
that can be drawn from its shaft without it slipping poles when the field current is zero?

SOLUTION When the field current is zero, E A = 0, so

2
3 VE 3 V  X  X 
P   A sin     d q  sin 2   

X d 2  XX q 
d
  3 7621  2 0.62 0.40  
 
P      sin 2 14.8sin 2 MW

  2 0.62 0.40  
At   45  , 14,8 MW can be drawn from the motor.

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