Homework Answers
The motor is not steady when operating at speeds below maximum torque. It operates in that region only while starting.
The operating region is between rated speed and synchronous speed.
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9) Sketch the torque speed curve for a typical induction motor. Label the synchronous speed (N)...
(b) (i) Explain briefly why an induction motor can never run at synchronous speed? (2 Marks)...
(b) (i) Explain briefly why an induction motor can never run at synchronous speed? (2 Marks) (ii) If a six-pole induction motor supplied by a three-phase 50 Hz supply has a rotor frequency of 2.3 Hz, Calculate: (a)The percentage slip (b)The speed of the rotor in rpm (4 Marks) (iii)Draw a typical torque versus slip characteristic curve of an induction motor. If rotor resistance is increased show how the new torque versus slip curve deviates from the original one. (4...
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence it...
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t(slip) % of the Peak Torque Floalslip) Slightly reduced operating speed, but double the operating slip 2001000 100 200 slip) % of the Starting Torque We can influence its torque production...
QUESTION 8 The speed-torque characteristic of an induction motor has been empirically determined as follows: Speed 147 440 41 1.3001.100 Torque 3 Speed 900 750 350 rev/min Torque 13 11 75 N-m 6 9 15...
QUESTION 8 The speed-torque characteristic of an induction motor has been empirically determined as follows: Speed 147 440 41 1.3001.100 Torque 3 Speed 900 750 350 rev/min Torque 13 11 75 N-m 6 9 15 13 The motor will drive a load requiring a starting torque of 7 N-m and increase linearly with speed to 13 N-m at 1,500 rev/min. Find the steady-state operating point of the motor. Enter the one best answer (as a number without the units) from...
I want to solve this problem step by step. Thanks 3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's i...
I want to solve this problem step by step. Thanks
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t (slip) fslip) load slip) of the Peak Torque Slightly reduced operating speed, but double the operating slip 200 -200 100...
true or false 11. the speed of a synchronous motor does not decrease with an increase...
true or false 11. the speed of a synchronous motor does not decrease with an increase in mechanical output. 12. selsyn motors are selective synchronous motors. the capacitor-start, induction-run motor interchange the connections of the leads to the polarized starting capacitor. 14. to reverse direction of rotation of a capacitor-start induction-run motor interchange the connections of the leads to the polarized starting capacitor. 15. the centrifugal switch contacts will close when a motor gets close to it's normal operating speed....
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the ...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
4. The below Torque vs load curve is Torque Peak Torque a typical characteristic curve for...
4. The below Torque vs load curve is Torque Peak Torque a typical characteristic curve for a stepper motor. Briefly discuss (1 or Startng forque (Stand still 2 sentence for each) about the keywords mentioned in the figure. Answer: No load speed Speed
Below shows a graph of speed vs torque characteristic of a 3-phase induction motor. Describe how...
Below shows a graph of speed vs torque characteristic of a
3-phase induction motor. Describe how the induction motor speed
varies as the motor torque increases.
Graph of Speed vs Torque Characteristic Torque (N.m) 0 2 00 400 600 1000 1200 1400 1600 800 Speed (r/min)
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and...
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and 12 poles. The synchronous speed of a 3-phase, 4-pole induction motor is 60 rev/s. Determine the frequency of the supply to the stator windings. The synchronous speed of a 3-phase induction motor is 25 rev/s and the frequency of the supply to the stator is 50 Hz. Calculate the equivalent number of pairs of poles of the motor. A 6-pole, 3-phase induction motor is...
Three-phase induction motor The three-phase induction motor nameplate gives the following informa...
Three-phase induction motor The three-phase induction motor nameplate gives the following information: 100 HP, 6 poles, 600 V, 60 Hz, PF =0.87. Rated motor slip s=0.0275 and rated motor current is 91.7 A. Measured at rated speed friction and ventilation losses are 1100 W. Measured between two motor terminals resistance is 0.305 Ω. f) For a load such where the motor rotates at the speed of 1180 r / min, determine shaft torque and calculate the mechanical power in HP,...
(b) (i) Explain briefly why an induction motor can never run at synchronous speed? (2 Marks) (ii) If a six-pole induction motor supplied by a three-phase 50 Hz supply has a rotor frequency of 2.3 Hz, Calculate: (a)The percentage slip (b)The speed of the rotor in rpm (4 Marks) (iii)Draw a typical torque versus slip characteristic curve of an induction motor. If rotor resistance is increased show how the new torque versus slip curve deviates from the original one. (4...
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t(slip) % of the Peak Torque Floalslip) Slightly reduced operating speed, but double the operating slip 2001000 100 200 slip) % of the Starting Torque We can influence its torque production...
QUESTION 8 The speed-torque characteristic of an induction motor has been empirically determined as follows: Speed 147 440 41 1.3001.100 Torque 3 Speed 900 750 350 rev/min Torque 13 11 75 N-m 6 9 15 13 The motor will drive a load requiring a starting torque of 7 N-m and increase linearly with speed to 13 N-m at 1,500 rev/min. Find the steady-state operating point of the motor. Enter the one best answer (as a number without the units) from...
I want to solve this problem step by step. Thanks
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t (slip) fslip) load slip) of the Peak Torque Slightly reduced operating speed, but double the operating slip 200 -200 100...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
4. The below Torque vs load curve is Torque Peak Torque a typical characteristic curve for a stepper motor. Briefly discuss (1 or Startng forque (Stand still 2 sentence for each) about the keywords mentioned in the figure. Answer: No load speed Speed
Below shows a graph of speed vs torque characteristic of a
3-phase induction motor. Describe how the induction motor speed
varies as the motor torque increases.
Graph of Speed vs Torque Characteristic Torque (N.m) 0 2 00 400 600 1000 1200 1400 1600 800 Speed (r/min)
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and 12 poles. The synchronous speed of a 3-phase, 4-pole induction motor is 60 rev/s. Determine the frequency of the supply to the stator windings. The synchronous speed of a 3-phase induction motor is 25 rev/s and the frequency of the supply to the stator is 50 Hz. Calculate the equivalent number of pairs of poles of the motor. A 6-pole, 3-phase induction motor is...
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