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 isdesired to operate this motor with a 250 A current limit to provide a controlled acceleration atstart-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 Acurrent.

Answered: Image /qna-images/answer/86e81c52-18af-4a9c-81e3-4f2979d344bf.jpg

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.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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