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AC Generator Theory
13 questions By Tony R. Kuphaldt
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Question 13 of 13
Suppose we have an alternator with three sets of windings, A, B, and C:
Each pair of windings in each set is series-connected, so they act as just three separate windings (pay close attention to the phase-marking dots!):
If one end of each winding pair were connected together at a common ground point, and each winding pair output 70 volts RMS, how much voltage would be measured between any two open wires?
Reveal answer121.2 volts
Follow-up question: draw a phasor diagram showing how the difference in potential (voltage) between the wire ends is equal to 121.2 volts, when each winding coil’s voltage is 70 volts.
Notes:This question is a good exercise of students’ knowledge of phase shift, in a very practical context.
