B4. Fig. B4 shows the per-phase equivalent circuit of a 380 V, 4-pole, 1440 rev/min, 50 Hz, star-connected three-phase i
Posted: Mon May 09, 2022 8:01 am
- B4 Fig B4 Shows The Per Phase Equivalent Circuit Of A 380 V 4 Pole 1440 Rev Min 50 Hz Star Connected Three Phase I 1 (40.16 KiB) Viewed 22 times
4-pole, 1440 rev/min, 50 Hz, star-connected three-phase induction
motor.
Rs : Stator Resistance
0.2Ω
R’r : Referred Rotor Resistance
0.2 Ω
Xs : Stator Reactance
0.6 Ω
X’r : Referred Rotor Reactance
0.6 Ω
B4. Fig. B4 shows the per-phase equivalent circuit of a 380 V, 4-pole, 1440 rev/min, 50 Hz, star-connected three-phase induction motor. 0.2Ω Re: Stator Resistance : Re R: Referred Rotor Resistance Xs: Stator Reactance 0.2 Ω 0.62 X':: Referred Rotor Reactance 0.6 32 E 4 R R W jX 2000 Ri's M jXY 000 D Vs Fig. B4 C (a) Evaluate (1) the slip at rated speed, (in the supply current at rated speed, (iii) the torque at rated speed, (iv) the slip at maximum torque, (v) the supply current at maximum torque, and (vi) the maximum torque. (3 marks) (3 marks) (2 marks) (2 marks) (3 marks) (2 marks) (b) An electrical engineer reported a three phase induction motor (5 marks) performed a low efficiency at low frequency operation with VVVF control. What is the reason behind?