1. Find the required single-phase excitation voltage at rated voltage and frequency, in Volts 2. Find the required single-phase excitation voltage when both terminal voltage and frequency are 80% of their rated values, in Volts
1. Find the required single-phase excitation voltage at rated voltage and frequency, in Volts 2. Find the required single-phase excitation voltage when both terminal voltage and frequency are 80% of their rated values, in Volts
Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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1. Find the required single-phase excitation voltage at rated voltage and frequency, in Volts
2. Find the required single-phase excitation voltage when both terminal voltage and frequency are 80% of their rated values, in Volts
Transcribed Image Text:A synchronous motor has the following characteristics / nameplate ratings:
Frequency = 60 Hz
●
• Pole count = 4
• Rated power = 100 kW
• Voltage = 480 V
• Power factor = 0.9 lead
• Armature resistance = 0.04 Ohms
Synchronous reactance = 0.3 Ohms
●
This motor is driving a load whose power (in kW) is given by 38 +
power factor is maintained at 0.98 lagging.
0.2w sync
ㅠ
-; mechanical losses are neglected. At the motor terminals, the
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