7-18. A 208-V, 60 Hz six-pole, Y-connected, 25-hp design class B induction motor is tested in the laboratory, with the following results: No load: Locked rotor: DC test: 208 V, 22.0 A, 1200 W, 60 Hz 24.6 V, 64.5 A, 2200 W, 15 Hz 13.5 V, 64 A Find the equivalent circuit of this motor, and plot its torque-speed characteristic curve.
7-18. A 208-V, 60 Hz six-pole, Y-connected, 25-hp design class B induction motor is tested in the laboratory, with the following results: No load: Locked rotor: DC test: 208 V, 22.0 A, 1200 W, 60 Hz 24.6 V, 64.5 A, 2200 W, 15 Hz 13.5 V, 64 A Find the equivalent circuit of this motor, and plot its torque-speed characteristic curve.
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Transcribed Image Text:7-18. A 208-V, 60 Hz six-pole, Y-connected, 25-hp design class B induction motor is
tested in the laboratory, with the following results:
No load:
Locked rotor:
DC test:
208 V, 22.0 A, 1200 W, 60 Hz
24.6 V, 64.5 A, 2200 W, 15 Hz
13.5 V, 64 A
Find the equivalent circuit of this motor, and plot its torque-speed characteristic
curve.
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Step 1: Stating the given data,
VIEWStep 2: Finding the impedance and impedance angle,
VIEWStep 3: FInding the resistance and reactrance of locked rotor test,
VIEWStep 4: FInding the rotopr reactnace and rotor resistance,
VIEWStep 5: the equivalent circuit in DC test,
VIEWStep 6: FInding the resistance offered by stator,
VIEWStep 7: The equivalent circuit of induction motor,
VIEWStep 8: Plotting the torque speed characteristics of class B induction motor,
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VIEW
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