If F1 is the constant amplitude of fundamental rotating MMF wave, the for the space harmonics of order 6K-1 (where K=1,2,3….), the harmonic MMF wave is of _____________
A. Constant amplitude and stationary in space
B. Constant amplitude and rotates along F1
C. Varying amplitude and rotates along F1
D. Constant amplitude and rotates against F1
Answer:A
If F1 is the constant amplitude of fundamental rotating MMF wave, the for the space harmonics of order 6K-1 (where K=1,2,3….), the harmonic MMF wave is of _____________
A. Constant amplitude and stationary in space B. Constant amplitude and rotates along F1 C. Varying amplitude and rotates along F1 D. Constant amplitude and rotates against F1
Explanation: Space harmonics of the order of 6K-1(5,11,17,…) have their constant amplitude equal to 1/(6K-1)F1 and rotate in the direction of fundamental component F1 at a speed of 1/(6K+1) of the fundamental synchronous speed. 2. Which of the following harmonics are present in the resultant MMF produced by 3 phase currents flowing in the 3 phase windings?