The dc motor of Problem 7.1 is operating in steady state with a speed of 500rad/s. The load is purely inertial with an inertia of 0.04 kg⋅m²
. At some instant, its speed is to decrease linearly and reverse to 100rad/s in a total of 4 s. Neglect Lₐ
and friction. Calculate and plot the required current and the resulting voltage vₐ
that should be applied to the armature terminals of this machine. As intermediate steps, calculate and plot eₐ​, the required electromagnetic torque Tₑₘfrom the motor, and the current iₐ.