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A 60 Hz, four-pole 480 V, three-phase, wye-connected induction machine has the following parameters: R1 = 0.2Ω R2’ = 0.3Ω XT = 12Ω The motor is loaded with a unidirectional constant-torque of 40 Nm. A counter current braking is performed on the motor, by interchanging phases A and B. Determine The motor speed at the new steady-state point The operating mode at the new steady-state point. Efficiency of the machine at the new steady-state pint. (Assume negligible core and mechanical loses.)

A 60 Hz, four-pole 480 V, three-phase, wye-connected induction machine has the following parameters: R1 = 0.2Ω R2’ = 0.3Ω XT = 12Ω The motor is loaded with a unidirectional constant-torque of 40 Nm. A counter current braking is performed on the motor, by interchanging phases A and B. Determine The motor speed at the new steady-state point The operating mode at the new steady-state point. Efficiency of the machine at the new steady-state pint. (Assume negligible core and mechanical loses.)

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
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A 60 Hz, four-pole 480 V, three-phase, wye-connected induction machine has the following parameters:

R1 = 0.2Ω              R2’ = 0.3Ω             XT = 12Ω

The motor is loaded with a unidirectional constant-torque of 40 Nm. A counter current braking is performed on the motor, by interchanging phases A and B. Determine

  1. The motor speed at the new steady-state point
  2. The operating mode at the new steady-state point.
  3. Efficiency of the machine at the new steady-state pint. (Assume negligible core and mechanical loses.)
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