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The key idea is how a three-phase generator interacts with a rectifier that uses six switches (a six-pulse arrangement). In a six-pulse converter, conduction happens in six 60-degree steps, with two phases conducting to form a line-to-line path at any moment. The resulting line-to-line voltage waveform has a fundamental component whose peak is about 0.866 times the peak of the line-to-line voltage. When you relate that to the common RMS rating of the machine, this works out to roughly 0.87 of the rated voltage on the AC side under that loading condition. In other words, a three-phase six-pulse setup inherently tends to present about 87% of the rated voltage to the circuit it’s connected to. The other generator types don’t produce this specific characteristic voltage relationship: autotransformers shift voltage levels but aren’t tied to this 0.87 factor; twelve-pulse arrangements improve harmonic performance but don’t define this particular voltage ratio; high-frequency generators serve different applications and don’t define the 87% relationship either.