Consider a permanent-magnet dc motor with the following parameters: Ra = 0.35?, La = 1.5 mH,
kE = kT = 0.5, and Jm = 0.02 kg*m2. The rated motor torque of this motor is 4Nm.
Plot the steady state torque-speed characteristic for Va = 100V, 60V, and 30V.
Calculate the armature voltage to be applied in the steady state at the speed of 1500 rpm when the motor torque load require is 3 Nm.