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)
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Author:Robert L. Boylestad
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Chapter1: Introduction
Section: Chapter Questions
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Question
![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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F53cd4567-e9c0-49bc-8f29-7fe4db37c68a%2F790dbfb9-dfcb-48b3-980f-c5fb795cd725%2Ffcy8pvf_processed.jpeg&w=3840&q=75)
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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