Give all your answers correct to 4 d.p. A 490 V permanent magnet excited DC motor has armature resistance of 2 . When dr

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Give All Your Answers Correct To 4 D P A 490 V Permanent Magnet Excited Dc Motor Has Armature Resistance Of 2 When Dr 1 (45.69 KiB) Viewed 29 times

Give all your answers correct to 4 d.p. A 490 V permanent magnet excited DC motor has armature resistance of 2 . When driving a load of constant load torque at rated speed of 1,100 rpm, the armature takes rated 15A Speed is controlled by armature voltage variation and armature is supplied from a three-phase fully controllable bridge rectifier. Available AC voltage is three phase 400 V, 50 Hz, interfacing transformer is not used, and armature current is continuous a) The machine operates at rated speed with rated load Determine rectifier output voltage and thyristor firing angle [5 marks] Vredi Number V a = Number (degree) b) Determine the rated motor torque and power 16 marks] Ton = Number Nm Pn= Number KW c) The machine operates at 30 % of the rated speed with 85% of the rated load Determine rectifier output voltage and the thyristor firing angle 15 marks] Vrect2 = Number v 02 Number (degree) d) A three-phase rectifier can operate with different load types at the output. One possibility is placement of a capacitor across the output Explain when this is done and why? [4 marks) (This question is manually graded)