Explanation: If lamination thickness is made less than 0.4 mm, the reduction in eddy current losses is achieved, but at the cost of additional labor charges in assembling the rotor. 6. In an induction motor, which of the following is correct:
A. Stator core loss < rotor core loss
B. Stator core loss = rotor core loss
C. Stator core loss > rotor core loss
D. Any of the mentioned
Answer:A
Explanation: If lamination thickness is made less than 0.4 mm, the reduction in eddy current losses is achieved, but at the cost of additional labor charges in assembling the rotor. 6. In an induction motor, which of the following is correct:
A. Stator core loss < rotor core loss B. Stator core loss = rotor core loss C. Stator core loss > rotor core loss D. Any of the mentioned
Explanation: The rotor core loss is almost negligible because of reduced frequency of the flux reversals (equal to slip frequency, sf) in the rotor, and Pe∝f2 and Ph∝f. ( Pe = eddy current losses, Ph = hysteresis losses) 7. The pole shoes in DC and synchronous machines are laminated to reduce _____________