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Problem 3 (40 points) An induction motor is to be started at a reduced voltage. If...
A 50-KW, 220V, 50 Hz, squirrel-cage three-phase induction motor is needed to rotate a mine conveyor...
A 50-KW, 220V, 50 Hz, squirrel-cage three-phase induction motor is needed to rotate a mine conveyor belt drive. The motor starts sometimes under load, but most of the time is needed to run at rated speed and slip of 3.5%. (a) Propose an appropriate design of this drive motor in order to suit the application. Motivate and then illustrate your design with suitable drawings and speed (slip)-torque graphs. [12] (b) If the supply voltage of the motor in (a) above...
4.6. A 460-V, 75 kW, 4-pole, delta-connected, 60-Hz, three- phase induction motor has a full-load slip of 5 percent, an efficiency of 92 percent and a power-factor of 0.87 lagging at full-load. At st...
4.6. A 460-V, 75 kW, 4-pole, delta-connected, 60-Hz, three- phase induction motor has a full-load slip of 5 percent, an efficiency of 92 percent and a power-factor of 0.87 lagging at full-load. At start-up, the motor develops 1.9 times the full load developed torque but draws 7.5 times the rated current at the rated voltage. This motor is to be started with an auto- transformer reduced-voltage starter. Assume the stator resistance and the stator core loss to be negligible. Calculate...
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...
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...
how do we calculate ii and iii) - induction motor (25 marks) QUESTION 3 A three-phase,...
how do we calculate ii and iii) - induction motor
(25 marks) QUESTION 3 A three-phase, 400 V, 50 Hz, 4-pole, 1370 rpm, star connected, squirrei-cage induction motor has the following parameters: R, 20, R2- 3 Q, X1-X2- 3.5 and Xm=40 .Motor is controlled by a voltage source inverter at constant V/f ratio. By using IEEE equivalent circuit; Calculate the starting torque and starting current at 10 Hz To- If the torque-speed to be a straight line calculate the slip...
3, A 34, 400-V 50-Hz induction motor takes 4 times the full-load current and develops twice the f...
3, A 34, 400-V 50-Hz induction motor takes 4 times the full-load current and develops twice the full- load torque when direct-switched to 400-V supply. Calculate in terms of full-load values (a) the line curent, the motor current and starting torque when started by an auto-starter with 50% tap and (b) the voltage that has to be applied and the motor current, if it is desired to obtain full-load torque on (a) 100%, 200%, 50% (b) 228 V, 282%) starting...
A 3-phase, 460 V, 1740 rpm, 60 Hz, 4-pole wound-rotor induction motor has the following parameters...
A 3-phase, 460 V, 1740 rpm, 60 Hz, 4-pole wound-rotor induction motor has the following parameters per phase: R1 = 0.25 Ω, ' 2R = 0.2Ω, ' 1 2 X = X = 0.5Ω, 30 m X = Ω. The rotational losses are 1700 W. With the rotor terminals short-circuited, find: 1. at starting: • current when started direct on full voltage, • a torque 2. at full load: • slip • current • ratio of starting current to full-load...
7. A 3-phase, 300 kW, 2300 V, 60 Hz, 1800 r/min induction motor is used to...
7. A 3-phase, 300 kW, 2300 V, 60 Hz, 1800 r/min induction motor is used to drive a compressor. The motor has a full- load efficiency and power factor of 93 percent and 87 percent, respectively. If the terminal voltage rises to 2750 V while the motor operates at full-load, determine the effect (increase or decrease) upon a. Mechanical power delivered by the motor b. Motor torque c. Rotational speed d. Full-load current e. Power factor and efficiency f. Starting...
I just want the answer for part D. So, I will give the answers to the rest of the questions to as...
I just want the answer for part D. So, I will give the answers
to the rest of the questions to assist in answering part d of the
question.
A) i) 244.2 A (ii) 0.408 lagging (iii) 183.8 Nm B) (i) 0.033
(ii) 42.8A (iii) 5.7 (iv)0.941 lagging (v) 162.8 Nm (vi) 87% C) (i)
Rth = 0.24 Xth = 0.49 X2 = 0.5 (ii) 0.196 (iii) 431.2 Nm
Hopefully, these answers will help
A 3-phase, Y-connected, 460V, 60Hz, 4-pole...
Problem#(50 points) The nameplate for a three phase induction motor is shown below. The "NEMA NOM. EFF." of 93.6% can be taken to be the efficiency. Keep in mind that voltage and cu...
Problem#(50 points) The nameplate for a three phase induction motor is shown below. The "NEMA NOM. EFF." of 93.6% can be taken to be the efficiency. Keep in mind that voltage and current in a 3PH system are specified as line voltage and current SIEMENS PE 21 PLUS PREMUM EFFICE 40 LL AND CHEMICAL DUITY QUALL Part A Assume the motor is run at the rated nameplate conditions: (a) Find the real electrical input power. (b) Find the numerical value...
4.6. A 460-V, 75 kW, 4-pole, delta-connected, 60-Hz, three- phase induction motor has a full-load slip of 5 percent, an efficiency of 92 percent and a power-factor of 0.87 lagging at full-load. At start-up, the motor develops 1.9 times the full load developed torque but draws 7.5 times the rated current at the rated voltage. This motor is to be started with an auto- transformer reduced-voltage starter. Assume the stator resistance and the stator core loss to be negligible. Calculate...
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...
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...
how do we calculate ii and iii) - induction motor
(25 marks) QUESTION 3 A three-phase, 400 V, 50 Hz, 4-pole, 1370 rpm, star connected, squirrei-cage induction motor has the following parameters: R, 20, R2- 3 Q, X1-X2- 3.5 and Xm=40 .Motor is controlled by a voltage source inverter at constant V/f ratio. By using IEEE equivalent circuit; Calculate the starting torque and starting current at 10 Hz To- If the torque-speed to be a straight line calculate the slip...
3, A 34, 400-V 50-Hz induction motor takes 4 times the full-load current and develops twice the full- load torque when direct-switched to 400-V supply. Calculate in terms of full-load values (a) the line curent, the motor current and starting torque when started by an auto-starter with 50% tap and (b) the voltage that has to be applied and the motor current, if it is desired to obtain full-load torque on (a) 100%, 200%, 50% (b) 228 V, 282%) starting...
I just want the answer for part D. So, I will give the answers
to the rest of the questions to assist in answering part d of the
question.
A) i) 244.2 A (ii) 0.408 lagging (iii) 183.8 Nm B) (i) 0.033
(ii) 42.8A (iii) 5.7 (iv)0.941 lagging (v) 162.8 Nm (vi) 87% C) (i)
Rth = 0.24 Xth = 0.49 X2 = 0.5 (ii) 0.196 (iii) 431.2 Nm
Hopefully, these answers will help
A 3-phase, Y-connected, 460V, 60Hz, 4-pole...
Problem#(50 points) The nameplate for a three phase induction motor is shown below. The "NEMA NOM. EFF." of 93.6% can be taken to be the efficiency. Keep in mind that voltage and current in a 3PH system are specified as line voltage and current SIEMENS PE 21 PLUS PREMUM EFFICE 40 LL AND CHEMICAL DUITY QUALL Part A Assume the motor is run at the rated nameplate conditions: (a) Find the real electrical input power. (b) Find the numerical value...
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