Question

A 230 V, 250 rpm, 100 A separately excited dc motor has an armature resistance of...

A 230 V, 250 rpm, 100 A separately excited dc motor has an armature resistance of 0.5 Ω. The motor is connected to 230 V dc supply and rated dc voltage is applied the field winding. It is driving a load whose torque-speed characteristic is given by

TL = 500 − 10ω where ω is the speed in rad/sec and TL is the load torque in N-m. Find

(a) the steady state speed at which the motor will drive the load. (b) the armature current.

Neglect the rotational losses of the machine.

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