A $220 \mathrm{~V}, 1000 \mathrm{rpm}, 20 \mathrm{~A}$ dc series motor is driving at rated conditions a load whose torque is proportional to speed squared. The combined resistance of armature and field is $1.2 \Omega$. Calculate motor terminal voltage and current for a speed of 900 rpm .

Explanation

To calculate motor terminal voltage, we need to subtract the voltage drop across the armature and field resistance from the supply voltage. To calculate motor terminal current, we need to consider the change in speed and its effect on the armature current.

A $220 \mathrm{~V}, 1000 \mathrm{rpm}, 20 \mathrm{~A}$ dc series motor is driving at rated conditions a load whose torque is proportional to speed squared. The combined resistance of armature and field is $1.2 \Omega$. Calculate motor terminal voltage and current for a speed of 900 rpm .

Explanation

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