A 200 v dc series motor runs at 500 rpm when taking a line current of 25 A the resistance of the armature is 0.3 ohm and that the series field 0.5 ohm if current taken remains constant calculate the resistance necessary to reduce the speed 350 rpm
Added by Michelle C.
Step 1
First, we need to find the back EMF (Eb1) at 500 rpm. We can use the formula: Eb1 = V - I * (Ra + Rse) where V = 200 V (supply voltage), I = 25 A (line current), Ra = 0.3 ohm (armature resistance), and Rse = 0.5 ohm (series field resistance). Show more…
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