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3. The nameplate of a Y-connected synchronous motor has the following information. Hp 20,000, RPM 1800,...
A 3-phase, 6,600 V, 6,000 HP, star-connected synchronous motor is to be operated under rated conditions...
A 3-phase, 6,600 V, 6,000 HP, star-connected synchronous motor is to be operated under rated conditions with full-load and a leading power factor of 0.50. The rotational losses under this conditions are 130 kW and may be taken as constant. The effective resistance and reactance are 0.085 and 2.90 ohms respectively. What is the value of the excitation voltage under this condition?
A 1500 kW, unity pf, 3-phase, Y-connected, 2300 V-(line), 30 pole, 60 Hz synchronous motor has...
A 1500 kW, unity pf, 3-phase, Y-connected, 2300 V-(line), 30 pole, 60 Hz synchronous motor has a synchronous reactance of 1.95 22/phase. For this problem all losses may be neglected. a. Compute the max. torque in Nm which this motor can deliver if it is supplied with power from an infinite bus, and if its field excitation is constant at the value which would result in unity (1.0) pf at rated load. b. Now, suppose that the motor is supplied...
4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rat...
Electric Machines - Synchronous Motors
4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rated load has a synchronous reactance of 1.20 ohms/phase, determine: Excitation voltage Power angle Pull-out torque Draw a phasor diagram a. b. c. d.
4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rated load has a synchronous reactance of 1.20 ohms/phase, determine: Excitation voltage Power angle Pull-out torque Draw a phasor diagram a....
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RP...
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RPM NEMA Design D Determine the speed at which the motor will produce maximum torque.
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RPM NEMA Design D Determine the speed at which the motor will produce maximum torque.
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240...
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RPM NEMA Design D Determine the speed at which the motor will produce maximum torque.
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,...
10.17.A split-phase motor has this information on its nameplate: 3/4 hp 1,725 rpm 13.8/6.9 A Full-load...
10.17.A split-phase motor has this information on its nameplate: 3/4 hp 1,725 rpm 13.8/6.9 A Full-load power factor: 0.70 Insulation class B Code U 115/230 V The motor is wired for low-voltage operation. (a) What is the synchronous speed of this motor? (b) What is the maximum locked-rotor cur rent it should draw if wired for 115-V opera- tion? (c) What is the full-load torque (lb ft)?
A 208 V, star-connected, 3-phase synchronous motor has a synchronous reactance of 4 ohms/phase and negligible...
A 208 V, star-connected, 3-phase synchronous motor has a synchronous reactance of 4 ohms/phase and negligible armature winding resistance. At a certain load, the motor takes 7.2 kW at 0.8 pf lagging. If the power developed by the motor remains the same while the excitation voltage is increased by 50% by raising the field excitation, determine (a) the new armature current and (b) the new power factor.
Question # 2(25 points) A three phase, 200 hp, 2400 V, 60 Hz, 4 pole, Y connected synchronous mot...
Question # 2(25 points) A three phase, 200 hp, 2400 V, 60 Hz, 4 pole, Y connected synchronous motor has a reactance of 12 Ω phase and a negligible armature resistance. The motor draws 150 KW at a power angle of-18 Determine a) The synchronous speed of the motor in rpm. (3 points) b) The excitation voltage E. (5 points) c) The line current. (5 points) d) The motor power factor. (3 points) e) The pull-out torque (maximum torque). (3...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a synchronous reactance of 0.6 and negligible armature resistance. Ignore the mechanical and core losses. The magnitude of the internal machine voltage is 480 V when the field current is 4 A. Assume magnetic linearity. Initially, the motor operates at the rated conditions. a) Find the speed of this motor. b) Find the armature and field currents. c) What is the developed torque? What is...
A 1500 kW, unity pf, 3-phase, Y-connected, 2300 V-(line), 30 pole, 60 Hz synchronous motor has a synchronous reactance of 1.95 22/phase. For this problem all losses may be neglected. a. Compute the max. torque in Nm which this motor can deliver if it is supplied with power from an infinite bus, and if its field excitation is constant at the value which would result in unity (1.0) pf at rated load. b. Now, suppose that the motor is supplied...
Electric Machines - Synchronous Motors
4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rated load has a synchronous reactance of 1.20 ohms/phase, determine: Excitation voltage Power angle Pull-out torque Draw a phasor diagram a. b. c. d.
4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rated load has a synchronous reactance of 1.20 ohms/phase, determine: Excitation voltage Power angle Pull-out torque Draw a phasor diagram a....
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RPM NEMA Design D Determine the speed at which the motor will produce maximum torque.
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RPM NEMA Design D Determine the speed at which the motor will produce maximum torque.
A motor has a nameplate with the following data: 50 HP 60 Hz 107.8/53.9 AFL 240 480 Volts 1530 RPM NEMA Design D Determine the speed at which the motor will produce maximum torque.
10.17.A split-phase motor has this information on its nameplate: 3/4 hp 1,725 rpm 13.8/6.9 A Full-load power factor: 0.70 Insulation class B Code U 115/230 V The motor is wired for low-voltage operation. (a) What is the synchronous speed of this motor? (b) What is the maximum locked-rotor cur rent it should draw if wired for 115-V opera- tion? (c) What is the full-load torque (lb ft)?
Question # 2(25 points) A three phase, 200 hp, 2400 V, 60 Hz, 4 pole, Y connected synchronous motor has a reactance of 12 Ω phase and a negligible armature resistance. The motor draws 150 KW at a power angle of-18 Determine a) The synchronous speed of the motor in rpm. (3 points) b) The excitation voltage E. (5 points) c) The line current. (5 points) d) The motor power factor. (3 points) e) The pull-out torque (maximum torque). (3...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a synchronous reactance of 0.6 and negligible armature resistance. Ignore the mechanical and core losses. The magnitude of the internal machine voltage is 480 V when the field current is 4 A. Assume magnetic linearity. Initially, the motor operates at the rated conditions. a) Find the speed of this motor. b) Find the armature and field currents. c) What is the developed torque? What is...
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