Discussion
Match the method with what it varies.
1. V/f control 2. Rotor resistance control 3. Pole changing
P. The synchronous speed in discrete steps Q. The frequency and voltage together R. The slip at which the machine runs
Answer: C
Correct answer: 1-Q, 2-R, 3-P
V/f control varies the frequency and the voltage together so as to keep the flux constant, which is Q. Rotor resistance control leaves the synchronous speed alone and changes the slip at which the machine settles, which is R. Pole changing switches the winding between, say, four and eight poles, so the synchronous speed \( 120f/P \) jumps between two discrete values, which is P.
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