with reference to 3 phase motor, state with reason a) significance of the air gap in...
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with reference to 3 phase motor, state with reason
a) significance of the air gap in...
5. (a) State the reason(s) for using a starter to start an induction motor. b) Describe,...
5. (a) State the reason(s) for using a starter to start an induction motor. b) Describe, with the aid of diagram(s), two methods for starting of a squirrel cage induction (c) The results of no-load and blocked-rotor test on a 3-phase, star-connected induction motor are as follows No-load test: Line-to-Line voltage = 380V: Input power = 1500W: Block-rotor test: Line-to-Line voltage 38V; Input power - 2.4kW Input current-15A; Friction and windage losses is 500W Input current-65A. Stator resistance between terminal...
4. A 3-phase, 340 V, Induction motor is supplied with 60 A at .85 pf lagging....
4. A 3-phase, 340 V, Induction motor is supplied with
60 A at .85 pf lagging. Its stator and rotor copper
losses are 4000 W and 800 W respectively, while its core losses are
2000 W, and its Friction, Windage
and Stray losses are a combined 750 W. Determine:
a. Draw a diagram depicting the energy flow in the motor (Similar
to the one we had drawn in class)
b The air gap power
c. The mechanical power developed
d....
The input power to a 480V, 3 phase, 6 pole, 50 Hz induction motor is 75kW...
The input power to a 480V, 3 phase, 6 pole, 50 Hz induction motor is 75kW with a line current of 75A and runs at a slip of 2.5%. If the stator core loss is 2 kW, windage and friction loss is 1.2 kW, and the stator resistance per phase is 0.16 ohm. Calculate: a. Power supplied to the rotor (Air gap power) b. Rotor copper loss c. Shaft power d. Efficiency of the motor e. Shaft torque f What...
8) The motor model for a 3-phase 480V 1750 RPM induction motor is shown below. Stray...
8) The motor model for a 3-phase 480V 1750 RPM induction motor is shown below. Stray losses are 1000W. Assuming it is running at full rated load in the United States, find: 0.01 j0.14 j0.14 0 _ 0.01 A 19 j16 30.01/18 ) Synchronous Speed= RPM Number of poles= Poles Slip= Stator current iz = Amps Rotor current lz= Amps Magnetization currently = Amps Watts HP Volts Power across the air gap= h) 3-phase shaft (brake) horsepower= Terminal Voltage "V"=...
Q4. State whether the following sentences are true or false, and give the reason behind your...
Q4. State whether the following sentences are true or false, and give the reason behind your answer. 1. Two equally rate three-phase induction and permanent magnet synchronous motors with unknown name plate data. At no load one of them draws a current of 40 A, and he second motor draws 50A. It is stated that the 50 A belongs for the induction motor. 2. Star delta starter is preferred for an induction motor coupled with a high mechanical load. 3....
A 3-phase, 208 V, 60 Hz, 30 hp, four-pole induction motor
A 3-phase, 208 V, 60 Hz, 30 hp, four-pole induction motor has the following equivalent circuit parameters. R1 = 0.2 Ω, , , Xm = 12Ω.The rotational loss is 500 W. For a slip of 5%, calculate (a) The motor speed in rpm and radians per sec (b) The current drawn by the motor from the power supply (c) The stator cu-loss (d) The air gap power (e) The rotor cu-loss (f) The shaft power (g)The developed torque and the shaft torque (h) The efficiency of the motor Use...
4. A 3-phase, 340 V, Induction motor is supplied with 60 A at.85 pf lagging. Its...
4. A 3-phase, 340 V, Induction motor is supplied with 60 A at.85 pf lagging. Its stator and rotor copper losses are 4000 W and 800 W respectively, while its core losses are 2000 W, and its Friction, Windage and Stray losses are a combined 750 W. Determine: a. Draw a diagram depicting the energy flow in the motor (Similar to the one we had drawn in class) b The air gap power c. The mechanical power developed d. The...
A three phase, 60 Hz induction motor rated at 440 V and 40 hp drives a...
A three phase, 60 Hz induction motor rated at 440 V and 40 hp drives a load at 1710 rpm. The induction motor has the following impedances referred to the stator in /phase: R,=0.1512, X,=0.7512; R2=1.222,X=0.7522; X=25 12 . The core loss is 450 W and friction and windage loss is 250 W. Calculate the following 1. line current and power factor 2. Real and reactive input power 3. Air-gap power 4. Mechanical power and torque developed 5. shaft horse...
If a 3-phase induction motor is to be fed by a fixed 50 Hz supply voltage,...
If a 3-phase induction motor is to be fed by a fixed 50 Hz supply voltage, is it possible that the induction motor operates at a speed of 4000 RPM? YES/NO? WHY?
5. (a) State the reason(s) for using a starter to start an induction motor. b) Describe, with the aid of diagram(s), two methods for starting of a squirrel cage induction (c) The results of no-load and blocked-rotor test on a 3-phase, star-connected induction motor are as follows No-load test: Line-to-Line voltage = 380V: Input power = 1500W: Block-rotor test: Line-to-Line voltage 38V; Input power - 2.4kW Input current-15A; Friction and windage losses is 500W Input current-65A. Stator resistance between terminal...
4. A 3-phase, 340 V, Induction motor is supplied with
60 A at .85 pf lagging. Its stator and rotor copper
losses are 4000 W and 800 W respectively, while its core losses are
2000 W, and its Friction, Windage
and Stray losses are a combined 750 W. Determine:
a. Draw a diagram depicting the energy flow in the motor (Similar
to the one we had drawn in class)
b The air gap power
c. The mechanical power developed
d....
8) The motor model for a 3-phase 480V 1750 RPM induction motor is shown below. Stray losses are 1000W. Assuming it is running at full rated load in the United States, find: 0.01 j0.14 j0.14 0 _ 0.01 A 19 j16 30.01/18 ) Synchronous Speed= RPM Number of poles= Poles Slip= Stator current iz = Amps Rotor current lz= Amps Magnetization currently = Amps Watts HP Volts Power across the air gap= h) 3-phase shaft (brake) horsepower= Terminal Voltage "V"=...
Q4. State whether the following sentences are true or false, and give the reason behind your answer. 1. Two equally rate three-phase induction and permanent magnet synchronous motors with unknown name plate data. At no load one of them draws a current of 40 A, and he second motor draws 50A. It is stated that the 50 A belongs for the induction motor. 2. Star delta starter is preferred for an induction motor coupled with a high mechanical load. 3....
4. A 3-phase, 340 V, Induction motor is supplied with 60 A at.85 pf lagging. Its stator and rotor copper losses are 4000 W and 800 W respectively, while its core losses are 2000 W, and its Friction, Windage and Stray losses are a combined 750 W. Determine: a. Draw a diagram depicting the energy flow in the motor (Similar to the one we had drawn in class) b The air gap power c. The mechanical power developed d. The...
A three phase, 60 Hz induction motor rated at 440 V and 40 hp drives a load at 1710 rpm. The induction motor has the following impedances referred to the stator in /phase: R,=0.1512, X,=0.7512; R2=1.222,X=0.7522; X=25 12 . The core loss is 450 W and friction and windage loss is 250 W. Calculate the following 1. line current and power factor 2. Real and reactive input power 3. Air-gap power 4. Mechanical power and torque developed 5. shaft horse...
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