An electromechanical open-loop control system is shown in Figure P2.13. The generator, driven at a constant speed, provides the field voltage for the motor. The motor has an inertia Jm and bearing friction bm. Obtain the transfer function θL(s)/Vf(s) and draw a block diagram of the system. The generator voltage vg can be assumed to be proportional to the field current if.

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Motor L. Ly Gear ration t Load 0 Gencrator N. FIGURE P2.13 Motor and generator.