Question 5: [20 Marks] A single phase full-wave rectifier shown in Figure 4 is used to control the speed of a10 hp. 220

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Question 5 20 Marks A Single Phase Full Wave Rectifier Shown In Figure 4 Is Used To Control The Speed Of A10 Hp 220 1 (50.12 KiB) Viewed 19 times

Question 5: [20 Marks] A single phase full-wave rectifier shown in Figure 4 is used to control the speed of a10 hp. 220 V, 1000 r/min separately excited DC motor. The converter is connected to a single-phase 250 V, 50 Hz supply. The armature resistance is Ra = motor torque (or voltage) constant is ko 0.252, and armature inductance is La 2.005 Nm/A. 10 mH. The = X A v.(wt) 50 Hz A Figure 4: Question 5 5.1. Determine the firing angle of the converter when the motor is operating under rated conditions- [3] 5.2. Determine the supply power factor for operating conditions in 5.1. [5] 5.3. The DC motor runs at 800 r/min, and draws a current of 40 A from the supply. Assuming that the motor current is ripple free, determine the firing angle of the converter under this condition. [6] 5.4. If the process requires that the motor should be run at 2000 r/min, explain how this could be achieved. [6]