Question

2. A 6-pole and three-phase induction motor has synchronous speed of (1000+X) RPM.
a) Find the no-load and full-load operating speed of motor for the cases given,
1. 2.5Hz electrical frequency of rotor for no-load condition. (15p)
2. 6.3Hz electrical frequency of rotor for full-load condition. (15p)
b) Find the speed regulation of motor by using parameters found above. (10p)
c) Determine the electrical frequency of rotor under full-load condition so that speed regulation would be equal to 5%? (Electrical frequency of rotor for no-load condition is still 2.5Hz.) (10p)
(X is the last three digits of your student number × 5. For example: If student number is 20-156-054, X=120. RPM is found 1000+(54*5) = 1270r/min.)
(Please use at least 4 digits after decimal point in your calculations. Otherwise, there may be problems about exact answers.)

Answer 1