A 240 V, 70 rad/s, dc, separately excited motor has a field constant K? = 3 Vs and an armature resistance of 1 ?.
a. Calculate the dynamic braking resistance that will not allow the braking current
to be larger than twice the rated value.
b. If the motor drives a constant-torque load of 60 Nm, calculate the new steady-
state speed and the current after the dynamic braking is applied.
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