Give All Your Answers Correct To 4 D P A 400 V 50 Hz 4 Pole 1 410 Rpm Star Connected Induction Motor Has The Follow 1 (28.33 KiB) Viewed 40 times
Give All Your Answers Correct To 4 D P A 400 V 50 Hz 4 Pole 1 410 Rpm Star Connected Induction Motor Has The Follow 2 (29.39 KiB) Viewed 40 times
Give all your answers correct to 4 d.p. A 400 V, 50 Hz, 4-pole, 1,410 rpm, star connected induction motor has the following parameters: stator and rotor resistances are respectively, 0.6 0 and 0.92, and stator and rotor leakage reactance are 10 each (magnetising reactance can be neglected). The motor is controlled by simultaneous stator voltage and frequency variation, using VF control principle. A voltage boost at zero frequency is not used. The motor is supplied from a three-phase voltage source inverter, operated in 180 degrees conduction mode.
b) Calculate the machine speed, fundamental component of the stator phase voltage and stator current for load torque equal to 60% of the rated torque and frequency equal to 25% of the rated frequency (it may be assumed that torque-speed curves are linear and parallel in the operating region). n = Number rpm V1 = Number V 11 = Number A C) Explain the purpose of the voltage boost, normally used in the voltage variation law for an induction motor, and how its omission affects the motor operation. (This question is manually graded.)
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