1. A shunt-connected DC motor equivalent circuit below has V1 = 240 V, and RA = 4 at 1000 rpm. The total field resistance is RF+ Radj = 300 2. The induced armature voltage is 120 V at 0.8A of IF. E, (V) 230 200 Raj RA w RF 120 EA 100 LF 10000 - 1000 rpm Field Armature 0 2.0 0.8 1.0 Fig. 1 (i) Draw the torque(Tdes) versus Speed(rpm) nm plot by using MATLAB. (ii) By changing from RA = 4 N to Ra = 8 N and 12 N respectively, redraw the curves from (i) at V1 = 240 V. (iii) By changing from Vr=240 V to 280V and 320V respectively, redraw the curves from (i) at RA = 40. All the matlab codes are to be submitted and all the curves are shown in the plots as below. Taev T Increasing V K RA Decreasing R V