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hw6_solutions

# hw6_solutions - l-l 60(Hz It has R s = 2.8 Ω R r = 6.3...

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ECE 320: Energy Conversion and Power Electronics Name: Spring 2009 Homework #6 (Due: Friday, April 10, 2009) Circle or box your answer (don’t forget units). Staple any additional paper used to arrive at your answers to this sheet. 1. A 3-phase 2-pole induction motor is rated 230 (V), 60 (Hz) with Y-connected windings. The stator and rotor resistances are 1 and 2 ( ), magnetizing reactance is 100 ( ), stator and rotor side leakage reactances are 2 and 2 ( ), respectively. a. Calculate the starting torque. b. Calculate the no-load current and power factor. 2. A 3 phase, 4-pole squirrel-cage, Y connected induction motor is rated 208 (V

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Unformatted text preview: l-l ), 60 (Hz). It has R s = 2.8 ( Ω ) , R r = 6.3 ( Ω ), X m = 190 ( Ω ), X ls = 4.1 ( Ω ), X lr = 2.3 ( Ω ). The load connected to the motor has a variable torque of: m L T ω ⋅ + = 0035 . 6 . (N·m) with in (rad/s) a. Will the motor start if it is connected to a source of rated voltage? b. Assume the motor does start. Is it going to reach a stable operating point? c. Will the motor start if it is connected to the source through a line of X line = 4.5 ( Ω )? -30-20-10 10-200-100 100 200 300 400 500 T (N·m) T L (N·m) T (N·m) ω m (rad/s) Operating Point...
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• Spring '09
• TimHogan
• Electric motor, Ω, induction motor, operating point, 3-phase 2-pole induction, Power Electronics Spring

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hw6_solutions - l-l 60(Hz It has R s = 2.8 Ω R r = 6.3...

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