For part (a) asked in part (e) the answer is (Field Winding and Armature winding

Question

For part (a) asked in part (e) the answer is (Field Winding and Armature winding)

What is the displacement angle between the MMFs produced by the two windings identified in (a) that results in maximum torque per ampere and what is the physical mechanism in DC machine construction that enables this relationship to be true (4 points)? e. f, If Ea%,, is the DC or Synchronous machine operating as a motor or a generator points)? A 12 pole induction motor has an applied frequency of 50 Hz and a slip of 6 percent. What is the mechanical speed? 8- B.

Explanation / Answer

(f) here machine behaves as synchronous generator.

(G) synchronous speed Ns=(120*50)/12=500 rpm.

Mechanical speed N=500*(1-0.06)=0.04*500=20 rpm.

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