Discussion
A 400 V 50 Hz machine is operated at 25 Hz under constant V/f control. The stator voltage should be about
Answer: A
Correct answer: 200 V
Constant V/f means the ratio is held at its rated value:
\[ \frac{V}{f} = \frac{400}{50} = 8 \text{ V/Hz}, \qquad V = 8 \times 25 = 200 \text{ V} \]In practice a small boost is added above this figure at low frequency to make up the stator resistance drop, but 200 V is the value the constant-ratio rule gives.
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