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A large 3-phase, 4000 V, 60 Hz, squirrel- induction motor draws a current of 23 cage 385 A and a total active power of 2344 kW when operating at full-load. The correspon- ding speed is accurately measured and is found to be 709.2 r/min. The stator is con- nected in wye and the resistance between two stator terminals is 0.10 2. The total iron losses are 23.4 kW and the windage and friction losses are 12 kW. Calculate the following: a. The power factor at full-load b. The active power supplied to the rotor c. The total I'R losses in the rotor d. The load mechanical power [kW], torque [kN-m], and efficiency [%] 24 If we slightl.

A large 3-phase, 4000 V, 60 Hz, squirrel- induction motor draws a current of 23 cage 385 A and a total active power of 2344 kW when operating at full-load. The correspon- ding speed is accurately measured and is found to be 709.2 r/min. The stator is con- nected in wye and the resistance between two stator terminals is 0.10 2. The total iron losses are 23.4 kW and the windage and friction losses are 12 kW. Calculate the following: a. The power factor at full-load b. The active power supplied to the rotor c. The total I'R losses in the rotor d. The load mechanical power [kW], torque [kN-m], and efficiency [%] 24 If we slightl.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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2) a 11 at r/min. Wha along a force tive resis Calculate the currer as con- ge in- the ro- Draw the complete coil connection If the conducting l; o braking force exer A 3-phase, 5000 h he same 27 -IXO..ddu 22 The 3-phase, 4-pole stator of Fig. 25 ho. ency: internal diameter of 250 mm and o stacking (OL 12 at 594 r/min. Wha 28 12-pole, wound-re following: a. The peripheral speed [m/s] of the tor PR losses at r. s of full- d no-load 29m The motor in Pro ob characteristics: 1. dc resistance = 0.112 2 a ase, connected to a 60 Hz source b. The peak voltage induced in the rotor bors c. The pole-pitch A large 3-phase, 4000 V, 60 Hz, squirrel- cage induction motor draws a current of 385 A and a total active power of 2344 kW when operating at full-load. The correspon- ding speed is accurately measured and is found to be 709.2 r/min. The stator is con- peed and percent. 2. dc resistanc 23 3. open-circui slip-rings w 4. line-to-line motor cent and late the bub5. no-load sta ppears cor in- 6. active pow load = 91 nected in wye and the resistance between two stator terminals is 0.10Q. The total iron losses are 23.4 kW and the windage and friction losses are 12 kW. Calculate the following: a. The power factor at full-load b. The active power supplied to the rotor c. The total IR losses in the rotor d. The load mechanical power [kW], torque [kN-m], and efficiency [%] ked. d by a 7. windage a 8. iron losse 9. locked-rot 10. active po" = 2207 k by a he across on as Calculate edo n as a. Rotor and 75°C (ass b. Voltage ar ating 24 have (increase or decrease) upon a. Starting torque rotor whe 594 r/min c. Reactive nstan- an an- g current to create d. PR losse speed ictor runs at m onea 75°C) e. Active Ț output he principle of magnetic levitation. no-load 30
Transcribed Image Text:2) a 11 at r/min. Wha along a force tive resis Calculate the currer as con- ge in- the ro- Draw the complete coil connection If the conducting l; o braking force exer A 3-phase, 5000 h he same 27 -IXO..ddu 22 The 3-phase, 4-pole stator of Fig. 25 ho. ency: internal diameter of 250 mm and o stacking (OL 12 at 594 r/min. Wha 28 12-pole, wound-re following: a. The peripheral speed [m/s] of the tor PR losses at r. s of full- d no-load 29m The motor in Pro ob characteristics: 1. dc resistance = 0.112 2 a ase, connected to a 60 Hz source b. The peak voltage induced in the rotor bors c. The pole-pitch A large 3-phase, 4000 V, 60 Hz, squirrel- cage induction motor draws a current of 385 A and a total active power of 2344 kW when operating at full-load. The correspon- ding speed is accurately measured and is found to be 709.2 r/min. The stator is con- peed and percent. 2. dc resistanc 23 3. open-circui slip-rings w 4. line-to-line motor cent and late the bub5. no-load sta ppears cor in- 6. active pow load = 91 nected in wye and the resistance between two stator terminals is 0.10Q. The total iron losses are 23.4 kW and the windage and friction losses are 12 kW. Calculate the following: a. The power factor at full-load b. The active power supplied to the rotor c. The total IR losses in the rotor d. The load mechanical power [kW], torque [kN-m], and efficiency [%] ked. d by a 7. windage a 8. iron losse 9. locked-rot 10. active po" = 2207 k by a he across on as Calculate edo n as a. Rotor and 75°C (ass b. Voltage ar ating 24 have (increase or decrease) upon a. Starting torque rotor whe 594 r/min c. Reactive nstan- an an- g current to create d. PR losse speed ictor runs at m onea 75°C) e. Active Ț output he principle of magnetic levitation. no-load 30
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