Problem 4.4: A 200-hp, three-phase, 60-Hz, six-pole, 1150-rpm, 0.90-pf induction motor operates with a VFD connected to 480-V lines. The VFD design has CSI fed from a de link. If the motor needs to runs at half the rated speed, determine (a) the rectifier firing delay angle and (b) the VFD output voltage at the motor terminals.

Problem 4.4: A 200-hp, three-phase, 60-Hz, six-pole, 1150-rpm, 0.90-pf induction motor operates with a VFD connected to 480-V lines. The VFD design has CSI fed from a de link. If the motor needs to runs at half the rated speed, determine (a) the rectifier firing delay angle and (b) the VFD output voltage at the motor terminals.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.2P

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Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

Problem 4.4: A 200-hp, three-phase, 60-Hz, six-pole, 1150-rpm, 0.90-pf
induction motor operates with a VFD connected to 480-V lines. The VFD
design has CSI fed from a de link. If the motor needs to runs at half the
rated speed, determine (a) the rectifier firing delay angle and (b) the VFD
output voltage at the motor terminals.

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Step 3: Determining VFD output voltage at motor terminal:

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