1.4 A dc series motor draws 300 A from a 750 V supply when deliveri at 950 r/min. The field and armature resistances are 0.13 oh
1.4 A dc series motor draws 300 A from a 750 V supply when deliveri at 950 r/min. The field and armature resistances are 0.13 oh
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Electrical Machines 1.4
![1.4 A dc series motor draws 300 A from a 750 V supply when delivering full load torque
at 950 r/min. The field and armature resistances are 0.13 ohm and 0.10 ohm,
respectively. Use 5 decimal places when calculating the constant of the
motor. Determine the line current and steady speed in r/min when:
(a) The motor delivers half load torque.
(b) The flux of the motor is weakening by 25% by adding an additional resistor of
1.2 ohm in series with the field coils.
(c) The motor delivers full-load torque with no additional resistor, but with a
reduced supply voltage of 700 V.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd59b5ac6-fe62-4611-92db-2703924e7284%2F9a6cd9cb-4b79-4b6f-9a7a-45dfea20f935%2Frlhm4ug_processed.png&w=3840&q=75)
Transcribed Image Text:1.4 A dc series motor draws 300 A from a 750 V supply when delivering full load torque
at 950 r/min. The field and armature resistances are 0.13 ohm and 0.10 ohm,
respectively. Use 5 decimal places when calculating the constant of the
motor. Determine the line current and steady speed in r/min when:
(a) The motor delivers half load torque.
(b) The flux of the motor is weakening by 25% by adding an additional resistor of
1.2 ohm in series with the field coils.
(c) The motor delivers full-load torque with no additional resistor, but with a
reduced supply voltage of 700 V.
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