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Most rotary phase converters produce 3-
In Figure 9, the L1 and L2 points on the triangle represent the single-
The dotted lines show the distance through the rotary windings from each leg to Neutral (N).
When you look at the path the T3 voltage takes to get to neutral, it is obvious that the "wild leg" is not really wild at all. It is simply electrically farther from T3 to the neutral point, and the distance through the winding simply increases the voltage reading by a factor of 1.73.
Remember that the system neutral is never connected to the rotary windings, and the 3-
phase relationships, Line to Neutral