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Give two basic speed control schemes of DC shunt motor?
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By using the flux control method-in this method a rheostat is connected across the field winding to control the field current. So by changing the current, the flux produced by the field winding can be changed, and since speed is inversely proportional to flux speed can be controlled

Armature control method-in this method a rheostat is connected across armature winding by varying the resistance the value of resistive drop(IaRa)can be varied and since speed is directly proportional to (Eb-IaRa) the speed can be controlled
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