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Problem 7 A three-phase, 60 Hz, six-pole, Y-connected, 480-V induction motor has the following parameters: R₁ = 0.202, R'2 = 0.102, Xeq = 50 The load of the motor is a drilling machine. At 1150 rpm, the load torque is 150Nm. The motor is driven by a constant v/f technique. When the frequency of the supply voltage is reduced to 50 Hz, calculate the following: a. Motor speed b. Maximum torque at 60 Hz and 50 Hz c. Motor current at 50 Hz Hint: For a drilling-machine load (an inverse-speed-characteristics load) T₁/T₂ = n2/n₁ = (1-S₂)/(1-S₁)

Problem 7 A three-phase, 60 Hz, six-pole, Y-connected, 480-V induction motor has the following parameters: R₁ = 0.202, R'2 = 0.102, Xeq = 50 The load of the motor is a drilling machine. At 1150 rpm, the load torque is 150Nm. The motor is driven by a constant v/f technique. When the frequency of the supply voltage is reduced to 50 Hz, calculate the following: a. Motor speed b. Maximum torque at 60 Hz and 50 Hz c. Motor current at 50 Hz Hint: For a drilling-machine load (an inverse-speed-characteristics load) T₁/T₂ = n2/n₁ = (1-S₂)/(1-S₁)

Introductory Circuit Analysis (13th Edition)
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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Problem 7 A three-phase, 60 Hz, six-pole, Y-connected, 480-V induction motor has the following parameters: R₁ = 0.202, R2 = 0.102, Xeq = 50 The load of the motor is a drilling machine. At 1150 rpm, the load torque is 150Nm. The motor is driven by a constant v/f technique. When the frequency of the supply voltage is reduced to 50 Hz, calculate the following: a. Motor speed b. Maximum torque at 60 Hz and 50 Hz c. Motor current at 50 Hz Hint: For a drilling-machine load (an inverse-speed-characteristics load) T₁/T₂ = n₂/n₁ = (1-S₂)/(1-S₁)
Transcribed Image Text:Problem 7 A three-phase, 60 Hz, six-pole, Y-connected, 480-V induction motor has the following parameters: R₁ = 0.202, R2 = 0.102, Xeq = 50 The load of the motor is a drilling machine. At 1150 rpm, the load torque is 150Nm. The motor is driven by a constant v/f technique. When the frequency of the supply voltage is reduced to 50 Hz, calculate the following: a. Motor speed b. Maximum torque at 60 Hz and 50 Hz c. Motor current at 50 Hz Hint: For a drilling-machine load (an inverse-speed-characteristics load) T₁/T₂ = n₂/n₁ = (1-S₂)/(1-S₁)
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