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3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results. Voltage (V) Current (A) 6.7 Power (W) 500 (including 230W Open-circuit test 420 mechanical loss) 980 Locked-rotor test 99 14.0 (a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected stator winding. (b) Determine the torque, output power, input line current, power factor and efficiency if the machine operates with a slip of 0.03. (c) If the stator winding is actually connected in delta what would be the value of resistance per-phase obtained from direct measurement?

3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results. Voltage (V) Current (A) 6.7 Power (W) 500 (including 230W Open-circuit test 420 mechanical loss) 980 Locked-rotor test 99 14.0 (a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected stator winding. (b) Determine the torque, output power, input line current, power factor and efficiency if the machine operates with a slip of 0.03. (c) If the stator winding is actually connected in delta what would be the value of resistance per-phase obtained from direct measurement?

Delmar's Standard Textbook Of Electricity
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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3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results. Voltage (V) Power (W) Current (A) 6.7 Open-circuit test 420 500 (including 230W mechanical loss) 980 Locked-rotor test 99 14.0 (a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected stator winding. (b) Determine the torque, output power, input line current, power factor and efficiency if the machine operates with a slip of 0.03. 1 (c) If the stator winding is actually connected in delta what would be the value of resistance per-phase obtained from direct measurement?
Transcribed Image Text:3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results. Voltage (V) Power (W) Current (A) 6.7 Open-circuit test 420 500 (including 230W mechanical loss) 980 Locked-rotor test 99 14.0 (a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected stator winding. (b) Determine the torque, output power, input line current, power factor and efficiency if the machine operates with a slip of 0.03. 1 (c) If the stator winding is actually connected in delta what would be the value of resistance per-phase obtained from direct measurement?
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