Answer to Question #196983 in Electrical Engineering for Chester Neil Dapug

Question #196983

A 4-pole shunt motor is lap-wound with 728 conductors, and has a flux of 25 mWb per

pole. The armature takes 50 Amp in current, the resultant demagnetizing effect due to

armature reaction reduces the air gap flux by 5%. What is developed torque of this

motor?


1
Expert's answer
2021-05-25T02:41:02-0400

"Torque=\\frac{1}{2 \\pi}\\times\\frac{ZP}{A}\\times \\phi I_a"

"Torque=\\frac{1}{2 \\pi}\\times\\frac{Z}{1}\\times \\phi I_a"

"Torque=\\frac{1}{2 \\pi}\\times\\frac{728}{1}\\times 25 \\times 10^{-3} \\times 50"

"Torque=\\frac{910}{2 \\pi}"

Considering the resultant demagnetizing effect due to armature reaction reduces the air gap flux by 5%

"Torque=\\frac{910}{2 \\pi} \\times \\frac{95}{100}=137.6 N-m"


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