Explain the effect of rotor resistance on starting torque and speed in induction motors and draw...
Explain the effect of rotor resistance on starting torque and speed in induction motors and draw typical curves of torque versus speed for 1x, 2x, 4x, and 8x of rotor resistance?
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Explain the effect of rotor resistance on starting torque and
speed in induction motors and draw...
(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...
A wound rotor, induction motor has a rotor resistance of 0.6 ohms per phase and a...
A wound rotor, induction motor has a rotor resistance of 0.6 ohms per phase and a rotor leakage reactance of 8 ohms . a) What is the operating speed (rpm) of this 2-pole induction motor fed from a 50 Hz supply if the slip is 5%? b) If maximum torque occurs when R2 = sX2, what is the slip at maximum torque? c) What resistance must be added to the rotor circuit to give maximum starting torque?
Explain the braking methods of induction motors by giving their torque-speed characteristics
Explain the braking methods of induction motors by giving their torque-speed characteristics
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...
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...
Q10. Based simply on the concept of rotor induction, explain what happens as the rotor approached...
Q10. Based simply on the concept of rotor induction, explain what happens as the rotor approached synchronous speed and why the rotor, practically, will always be slower than synchronous speed. What causes the rotor mmf? How must the rotor move with respect to the stator magnetic field in order to have a rotor mmf? What happens to torque as the rotor mmf (rotor flux density) decreases?
Q10. Based simply on the concept of rotor induction, explain what happens as the...
1)TELL THE RELATIONSHIP BETWEEN STARTING TORQUE , STARTING CURRENT , SLIP , AND SPEED IN CASE...
1)TELL THE RELATIONSHIP BETWEEN STARTING TORQUE , STARTING CURRENT , SLIP , AND SPEED IN CASE OF INDUCTION MOTOR I MEAN THAT IF I AM GIVEN 2 QUANTITIES FROM THEM THEN HOW I CAN MAKE GRAPGH FROM THEM 2) WHAT IS SYNCHRONUS SPEED 3) WHAT IS NOMINAL TORQUE, BREAKDOWN TORQUE, PULL UP TORQUE 4) GIVE CHARACTERISTICS OF WOUND ROTOR INDUNTION MOTOR UNDER NO LOAD , LOAD AND ROTOR IS LOAD
Q1. Summarize the formulas which describe the relationships among applied voltage, armature current, rotor speed, and...
Q1. Summarize the formulas which describe the relationships among applied voltage, armature current, rotor speed, and electromagnetic torque of a separately-excited DC motor. Q2. Explain the main features of a series-wound DC motor. Q3. Explain the main differences among synchronous motors, induction motors and DC motors.
-23 An 8-pole, 230-V, 60-Hz, A-connected, three-phase induction motor has a rotor impedance of 0.025 +...
-23 An 8-pole, 230-V, 60-Hz, A-connected, three-phase induction motor has a rotor impedance of 0.025 + 0.112/phase. The stator winding impedance is negligible. Determine (a) the speed at which the motor develops the maximum torque, (b) the maximum torque of the motor, and (c) the start- ing torque as a percentage of maximum torque. What additional resistance must be inserted in the rotor circuit to make the starting torque equal to 75% of the maximum torque?
Please use exact methods and not approximations! 7.15. A three-phase, 460 V, 60 Hz, 1760 rpm, wound-rotor induction mot...
Please use exact methods and not approximations!
7.15. A three-phase, 460 V, 60 Hz, 1760 rpm, wound-rotor induction motor has the following equivalent circuit parameters Ri=0.25 ohm : R'= 0.2 ohm : Xi = 1.2 ohm : X2,= 1.1 ohm : 'Ku = 35 ohm The motor is connected to a 3ph, 460V, 60Hz supply and is star-connected. Use the simplified equivalent circuit. Initially the external rotor resistance is set to zero. (a) Calculate the speed (in rpm) at which...
(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...
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...
Q10. Based simply on the concept of rotor induction, explain what happens as the rotor approached synchronous speed and why the rotor, practically, will always be slower than synchronous speed. What causes the rotor mmf? How must the rotor move with respect to the stator magnetic field in order to have a rotor mmf? What happens to torque as the rotor mmf (rotor flux density) decreases?
Q10. Based simply on the concept of rotor induction, explain what happens as the...
-23 An 8-pole, 230-V, 60-Hz, A-connected, three-phase induction motor has a rotor impedance of 0.025 + 0.112/phase. The stator winding impedance is negligible. Determine (a) the speed at which the motor develops the maximum torque, (b) the maximum torque of the motor, and (c) the start- ing torque as a percentage of maximum torque. What additional resistance must be inserted in the rotor circuit to make the starting torque equal to 75% of the maximum torque?
Please use exact methods and not approximations!
7.15. A three-phase, 460 V, 60 Hz, 1760 rpm, wound-rotor induction motor has the following equivalent circuit parameters Ri=0.25 ohm : R'= 0.2 ohm : Xi = 1.2 ohm : X2,= 1.1 ohm : 'Ku = 35 ohm The motor is connected to a 3ph, 460V, 60Hz supply and is star-connected. Use the simplified equivalent circuit. Initially the external rotor resistance is set to zero. (a) Calculate the speed (in rpm) at which...
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