A.2 a) b) A 480 V permanent-magnet excited DC motor has armature resistance of 1.5 . When driving a load of constant load torque at rated speed of 1200 rpm, the armature takes rated 20 A. 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 415 V, 50 Hz, interfacing transformer is not used, and armature current is continuous. The machine operates at rated speed with rated load. Determine rectifier output voltage and thyristor firing angle. Determine the rated motor torque and power. at 250 d with 750/

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QA.2
a)
b)
c)
d)
A 480 V permanent-magnet excited DC motor has armature
resistance of 1.5 . When driving a load of constant load
torque at rated speed of 1200 rpm, the armature takes rated
20 A. 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 415 V,
50 Hz, interfacing transformer is not used, and armature
current is continuous.
The machine operates at rated speed with rated load.
Determine rectifier output voltage and thyristor firing angle.
Determine the rated motor torque and power.
The machine operates at 25% of the rated speed with 75%
of the rated load. Determine rectifier output voltage and the
thyristor firing angle.
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?
Transcribed Image Text:QA.2 a) b) c) d) A 480 V permanent-magnet excited DC motor has armature resistance of 1.5 . When driving a load of constant load torque at rated speed of 1200 rpm, the armature takes rated 20 A. 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 415 V, 50 Hz, interfacing transformer is not used, and armature current is continuous. The machine operates at rated speed with rated load. Determine rectifier output voltage and thyristor firing angle. Determine the rated motor torque and power. The machine operates at 25% of the rated speed with 75% of the rated load. Determine rectifier output voltage and the thyristor firing angle. 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?
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