A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt- age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec- tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis- tance R = 5 mn. The internal voltage V₂ = kw, where k is a field flux constant equal to 3 V s/rad, and w is the shaft speed in rad/s. The shaft torque is T₂ = kia, where ia is the motor current. It is desired to operate this motor with a 250 A current limit to provide a controlled acceleration at start-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 A current.
A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt- age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec- tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis- tance R = 5 mn. The internal voltage V₂ = kw, where k is a field flux constant equal to 3 V s/rad, and w is the shaft speed in rad/s. The shaft torque is T₂ = kia, where ia is the motor current. It is desired to operate this motor with a 250 A current limit to provide a controlled acceleration at start-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 A current.
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter21: Resistive-capacitive Series Circuits
Section: Chapter Questions
Problem 7RQ: An RC series circuit is connected to a 120-V, 60-Hz power source. The resistor is 25 and has a...
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![21. A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt-
age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec-
tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis-
tance R₁ = 5 ms. The internal voltage Vg = kw, where k is a field flux constant equal to 3 V. s/rad,
and w is the shaft speed in rad/s. The shaft torque is Tekia, where ia is the motor current. It is
desired to operate this motor with a 250 A current limit to provide a controlled acceleration at
start-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 A
current.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9f443a46-23ce-4901-9911-37a8fa89aa68%2F86e81c52-18af-4a9c-81e3-4f2979d344bf%2F08h0g9g_processed.jpeg&w=3840&q=75)
Transcribed Image Text:21. A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt-
age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec-
tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis-
tance R₁ = 5 ms. The internal voltage Vg = kw, where k is a field flux constant equal to 3 V. s/rad,
and w is the shaft speed in rad/s. The shaft torque is Tekia, where ia is the motor current. It is
desired to operate this motor with a 250 A current limit to provide a controlled acceleration at
start-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 A
current.
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