Explanation: Sinusoidal current sheet produces sinusoidal MMF wave leading by 90°. 13. In a DC machine, z,p,Ia and a are respectively the number of conductors, number of poles, armature current and number of parallel paths. The peak value of fundamental component of armature MMF wave is ____________
A. 8/Π[(z/2p)(Ia/a)]
B. 8/Π2[(z/p)(Ia/a)]
C. 4/Π[(z/2p)(Ia/a)]
D. 8/Π2[(z/p)(Ia/a)]
Answer:A
Explanation: Sinusoidal current sheet produces sinusoidal MMF wave leading by 90°. 13. In a DC machine, z,p,Ia and a are respectively the number of conductors, number of poles, armature current and number of parallel paths. The peak value of fundamental component of armature MMF wave is ____________
A. 8/Π[(z/2p)(Ia/a)] B. 8/Π2[(z/p)(Ia/a)] C. 4/Π[(z/2p)(Ia/a)] D. 8/Π2[(z/p)(Ia/a)]
Explanation: The peak value of the fundamental sine component Fa for a DC machine is Fa=8/&Pi2;[(z/p)(Ia/a)] AT/pole. 14. The armature MMF wave in a DC machine is triangluar and