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Compared with a 2-pole synchronous machine of same frame size and rating with the same excitation, a 4-pole machine synchronous machine: a. b. C. d. A voltage source driven Permanent Magnet Synchronous Machine (PMSM) is operating in motoring mode. Initially, the mechanical load results in torque angle of 8 = -89⁰. What happens when the magnitude of the mechanical load suddenly increases by 20%? a. b. C. d. C. d. Will have a steady state rotor speed twice that the 2 pole machine Will have a steady state rotor torque twice that the 2 pole machine Both a and b Neither a nor b Which of the following phasor condition(s) will yield the lowest Is|²Rs losses for a given mechanical power delivered to the rotor? a. b. Unity (stator) power factor (cos (0) = 1) Unity internal power factor (cos (y) = 1) Maximum torque angle (sin (8) = 1) Both b and c. C. d. The torque angle increases to the maximum ( 8 = -90°) and then back EMF increases to meet the new load requirements. The torque angle exceeds the stability limit of 8 = -90° and the rotor comes out of synchronism with the voltage source. q-d based Field Oriented control of SMS: a. Uses two current regulators b. a. The sine of the torque angle (= sin(8)) decreases by 20%. None of the above. C. d. Like DC machines, separately excited (wound field) synchronous machine capability curves Uses physical hardware (inverter, machine stator windings, etc) located in the q-d (Park) rotating reference frame Uses back EMF decoupling Both a and c Have a constant torque region Have a constant power region at high speeds with field weakening Both a and b Neither a nor b

Compared with a 2-pole synchronous machine of same frame size and rating with the same excitation, a 4-pole machine synchronous machine: a. b. C. d. A voltage source driven Permanent Magnet Synchronous Machine (PMSM) is operating in motoring mode. Initially, the mechanical load results in torque angle of 8 = -89⁰. What happens when the magnitude of the mechanical load suddenly increases by 20%? a. b. C. d. C. d. Will have a steady state rotor speed twice that the 2 pole machine Will have a steady state rotor torque twice that the 2 pole machine Both a and b Neither a nor b Which of the following phasor condition(s) will yield the lowest Is|²Rs losses for a given mechanical power delivered to the rotor? a. b. Unity (stator) power factor (cos (0) = 1) Unity internal power factor (cos (y) = 1) Maximum torque angle (sin (8) = 1) Both b and c. C. d. The torque angle increases to the maximum ( 8 = -90°) and then back EMF increases to meet the new load requirements. The torque angle exceeds the stability limit of 8 = -90° and the rotor comes out of synchronism with the voltage source. q-d based Field Oriented control of SMS: a. Uses two current regulators b. a. The sine of the torque angle (= sin(8)) decreases by 20%. None of the above. C. d. Like DC machines, separately excited (wound field) synchronous machine capability curves Uses physical hardware (inverter, machine stator windings, etc) located in the q-d (Park) rotating reference frame Uses back EMF decoupling Both a and c Have a constant torque region Have a constant power region at high speeds with field weakening Both a and b Neither a nor b

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 5: Consider the following synchronous machine questions i through v, each of which is independent from the others. Select the best answer for each. i. ii. iii. iv. V. Compared with a 2-pole synchronous machine of same frame size and rating with the same excitation, a 4-pole machine synchronous machine: a. b. C. d. A voltage source driven Permanent Magnet Synchronous Machine (PMSM) is operating in motoring mode. Initially, the mechanical load results in torque angle of 8 = -89⁰. What happens when the magnitude of the mechanical load suddenly increases by 20%? a. b. C. d. C. d. Which of the following phasor condition(s) will yield the lowest Is|²Rs losses for a given mechanical power delivered to the rotor? a. b. a. b. Will have a steady state rotor speed twice that the 2 pole machine Will have a steady state rotor torque twice that the 2 pole machine Both a and b Neither a nor b C. d. The torque angle increases to the maximum ( 8 = -90°) and then back EMF increases to meet the new load requirements. The torque angle exceeds the stability limit of 8 = -90° and the rotor comes out of synchronism with the voltage source. q-d based Field Oriented control of SMS: Uses two current regulators The sine of the torque angle (= sin(8)) decreases by 20%. None of the above. d Unity (stator) power factor (cos (0) = 1) Unity internal power factor (cos (y) = 1) Maximum torque angle (sin (8) = 1) Both b and c. C. d. Like DC machines, separately excited (wound field) synchronous machine capability curves Uses physical hardware (inverter, machine stator windings, etc) located in the q-d (Park) rotating reference frame Uses back EMF decoupling Both a and c a. Have a constant torque region b. Have a constant power region at high speeds with field weakening Both a and b Neither a nor b
Transcribed Image Text:Problem 5: Consider the following synchronous machine questions i through v, each of which is independent from the others. Select the best answer for each. i. ii. iii. iv. V. Compared with a 2-pole synchronous machine of same frame size and rating with the same excitation, a 4-pole machine synchronous machine: a. b. C. d. A voltage source driven Permanent Magnet Synchronous Machine (PMSM) is operating in motoring mode. Initially, the mechanical load results in torque angle of 8 = -89⁰. What happens when the magnitude of the mechanical load suddenly increases by 20%? a. b. C. d. C. d. Which of the following phasor condition(s) will yield the lowest Is|²Rs losses for a given mechanical power delivered to the rotor? a. b. a. b. Will have a steady state rotor speed twice that the 2 pole machine Will have a steady state rotor torque twice that the 2 pole machine Both a and b Neither a nor b C. d. The torque angle increases to the maximum ( 8 = -90°) and then back EMF increases to meet the new load requirements. The torque angle exceeds the stability limit of 8 = -90° and the rotor comes out of synchronism with the voltage source. q-d based Field Oriented control of SMS: Uses two current regulators The sine of the torque angle (= sin(8)) decreases by 20%. None of the above. d Unity (stator) power factor (cos (0) = 1) Unity internal power factor (cos (y) = 1) Maximum torque angle (sin (8) = 1) Both b and c. C. d. Like DC machines, separately excited (wound field) synchronous machine capability curves Uses physical hardware (inverter, machine stator windings, etc) located in the q-d (Park) rotating reference frame Uses back EMF decoupling Both a and c a. Have a constant torque region b. Have a constant power region at high speeds with field weakening Both a and b Neither a nor b
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