A 525-volt, 50-Hz, three-phase induction motor has the following specifications Rated power 75 kW Rated speed 1468 r/min Efficiency 92% Power factor 0 86 lagging Startıng current 57 x In Starting torque 230% of Tn Mechanıcal losses 13 kW Use this information to determine the following 41 The mechanical output power at the shaft (or, "brake power") 42 The electrical input power 43 The output (rated) torque 44 full load current (In) 45 The rotor copper loss 46 The electromagnetic power (or, power input to the rotor through the airgap) 47 The gross torque ( as seen by the electromagnetic power) 48 Explain the difference between the rated torque and the electromagnetic torque (or, Where did the missıng torque go to?)

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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QUESTION 4
A 525-volt, 50-Hz, three-phase induction motor has the following specifications
Rated power
75 kW
Rated speed
1468 r/min
Efficiency
92%
Power factor
0 86 lagging
Startıng current
57 x In Starting torque
230% of Tn
Mechanical losses
13 kW
Use this information to determine the following
41
The mechanical output power at the shaft (or, "brake power")
42
The electrical input power
43
The output (rated) torque
44
full load current (l.)
45
The rotor copper loss
46
The electromagnetic power (or, power input to the rotor through the airgap)
47
The gross torque ( as seen by the electromagnetic power)
48
Explain the difference between the rated torque and the electromagnetic torque (or,
Where did the mıssıng torque go to?)
Transcribed Image Text:QUESTION 4 A 525-volt, 50-Hz, three-phase induction motor has the following specifications Rated power 75 kW Rated speed 1468 r/min Efficiency 92% Power factor 0 86 lagging Startıng current 57 x In Starting torque 230% of Tn Mechanical losses 13 kW Use this information to determine the following 41 The mechanical output power at the shaft (or, "brake power") 42 The electrical input power 43 The output (rated) torque 44 full load current (l.) 45 The rotor copper loss 46 The electromagnetic power (or, power input to the rotor through the airgap) 47 The gross torque ( as seen by the electromagnetic power) 48 Explain the difference between the rated torque and the electromagnetic torque (or, Where did the mıssıng torque go to?)
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