Fall_2012_HW#7 Solution

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Unformatted text preview: f\itI_{A}\rm\bf (A)'); title ('\bfSynchronous Motor V-Curve'); grid on; 3 ECE3602012FLHW#7 Problem #2 a) The , , and at rated condition power factor is leading and it would be, 746 500 || 373 373000 √3 √3 480 527.82 0.85 Since the motor is delta connected, || || 304.74 √3 Since the power factor is 0.85 leading, 304.74∠ 0.85 304.74∠31.79 259.03 160.53 Since it is motor not generator, 480∠0 0.6 304.74∠31.79 576.32 155.42 596.91∠ 15.1 The filed current is directly proportional to| | | ∴ |, with | | | 596.91 480 480∠0 480 4 4 b) When the load is removed from the motor, | ∴ | 4.97 |remains unchanged but 596.91∠0 0.6 0 194.85∠90 4 ECE3602012FLHW#7 Problem #3 a) The magnitude of the internal generated voltage ∴| b) | 90000 440 3 √3 3 440 ∠0 √3 377.32∠ 28 129.34∠24.07 1.5 cos 24.07 0.913 The maximum power is, | 3 e) 28 377.32 The power factor of motor is, . d) 1.5 The magnitude and...
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