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19. When the maximum torque of three phase induction motor is obtained at high slip: (3...
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,...
20 horsepower, 380V, 60Hz 6-pole 3-phase induction motor has 6% of full load slip. When operated...
20 horsepower, 380V, 60Hz 6-pole 3-phase induction motor has 6% of full load slip. When operated under full load, friction and wind damage are 220W, stator copper loss is 270W, and iron loss is 200W. Find the following under full load. a. Load torque b. Organic torque c. Pore power d. efficiency
A 4-pole, 60 hz, 3-phase induction motor has a blocked rotor reactance per phase that is...
A 4-pole, 60 hz, 3-phase induction motor has a blocked rotor reactance per phase that is four times the rotor resistance per phase. At what speed will the motor develop maximum torque? 1200 rpm 1500 rpm 1350 rpm 1620 rpm What is the ratio of maximum to full load torque in a motor having slip of 4% at full load and 20% at maximum torque? 15 3 2.6 5.2 If a motor has a slip of 2% at rated voltage,...
Question 11: (3 marks) A 6 pole, 60 Hz, star connected three-phase induction motor has a...
Question 11: (3 marks) A 6 pole, 60 Hz, star connected three-phase induction motor has a rating of Pm = 55 kW and line voltage = 420 V. The slip of the motor is 2% at 0.9 power factor lagging. If the full load efficiency is 95%, calculate the torque developed in the motor.
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...
Problem # 3: Induction Motor Analysis [30 points] The parameters of the per phase equivalent circuit...
Problem # 3: Induction Motor Analysis [30 points] The parameters of the per phase equivalent circuit of a three phase wye-connected, 220 V (line- line, rms) 10 hp, 60 Hz, six-pole induction motor are given as: Ri = 0.3 Ohm, R2-0.15 Ohm, Xi-0.5 Ohms, X2= 0.2 Ohm, Xm-15.0 The total friction, windage and core losses add up to be a constant of 400 W. For a slip of 0.025 with motor operating at rated frequency and stator voltage, calculate the...
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?
4. A 110-volt, 4-pole single phase induction motor with rl-1.3, r2-3, xl-2.5, x2-2, and xm-50, operates at full load slip of 3%. Find the full load torque, power facor and ficiency 20 points 4....
4. A 110-volt, 4-pole single phase induction motor with rl-1.3, r2-3, xl-2.5, x2-2, and xm-50, operates at full load slip of 3%. Find the full load torque, power facor and ficiency 20 points
4. A 110-volt, 4-pole single phase induction motor with rl-1.3, r2-3, xl-2.5, x2-2, and xm-50, operates at full load slip of 3%. Find the full load torque, power facor and ficiency 20 points
Problem 2. (25 points) For a 120-V, 1/3 hp, four pole, 1-phase induction motor, the parameters of the equivalent circuit, are R,-1.8(2, R,-2.5Ω, X,-X,-2.462, and Xm-60 Ω. At a slip of 500, the motor&...
Problem 2. (25 points) For a 120-V, 1/3 hp, four pole, 1-phase induction motor, the parameters of the equivalent circuit, are R,-1.8(2, R,-2.5Ω, X,-X,-2.462, and Xm-60 Ω. At a slip of 500, the motor's rotational losses are 51W. The rotational losses maybe assumed constant over the normal operating range of the motor. If the slip is 0.05, calculate a. Input Power b. Air Gap Power, c. Induced Torque Tin d. Output power e. Load torque. f. Overall Motor efficiency g....
Question 2 [10 marks) A six pole, three phase induction motor, with a star connected stator...
Question 2 [10 marks) A six pole, three phase induction motor, with a star connected stator winding is energised from a 380V, 50Hz supply. The ratio of the stator to rotor turns is assumed 1.8 and a full load slip of 4%. If the respective per phase rotor resistance and standstill reactance are 0.120 and 0.8502, determine: a. Torque developed at full load b. The maximum torque and the speed at maximum torque
Problem # 3: Induction Motor Analysis [30 points] The parameters of the per phase equivalent circuit of a three phase wye-connected, 220 V (line- line, rms) 10 hp, 60 Hz, six-pole induction motor are given as: Ri = 0.3 Ohm, R2-0.15 Ohm, Xi-0.5 Ohms, X2= 0.2 Ohm, Xm-15.0 The total friction, windage and core losses add up to be a constant of 400 W. For a slip of 0.025 with motor operating at rated frequency and stator voltage, calculate the...
4. A 110-volt, 4-pole single phase induction motor with rl-1.3, r2-3, xl-2.5, x2-2, and xm-50, operates at full load slip of 3%. Find the full load torque, power facor and ficiency 20 points
4. A 110-volt, 4-pole single phase induction motor with rl-1.3, r2-3, xl-2.5, x2-2, and xm-50, operates at full load slip of 3%. Find the full load torque, power facor and ficiency 20 points
Problem 2. (25 points) For a 120-V, 1/3 hp, four pole, 1-phase induction motor, the parameters of the equivalent circuit, are R,-1.8(2, R,-2.5Ω, X,-X,-2.462, and Xm-60 Ω. At a slip of 500, the motor's rotational losses are 51W. The rotational losses maybe assumed constant over the normal operating range of the motor. If the slip is 0.05, calculate a. Input Power b. Air Gap Power, c. Induced Torque Tin d. Output power e. Load torque. f. Overall Motor efficiency g....
Question 2 [10 marks) A six pole, three phase induction motor, with a star connected stator winding is energised from a 380V, 50Hz supply. The ratio of the stator to rotor turns is assumed 1.8 and a full load slip of 4%. If the respective per phase rotor resistance and standstill reactance are 0.120 and 0.8502, determine: a. Torque developed at full load b. The maximum torque and the speed at maximum torque
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