In article , Robert Swinney says...

No load, no generation, Don. An idler running with no load motor does not
constitute a RPC. The network and supported current flow through that
network makes a RPC. Remember the idler is running as a single-phase
machine and the 3rd leg is open, that is, until it is connected into a RPC.

No current flow, yes. But the third leg does come up in voltage, even
when open circuited. While it won't do any work, folks would be tempted
to say that the third leg is indeed "generated" even when it's open
circuited. Another one of those semantic mine fields....

Jim


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