phase converters for big iron

[Ethan Dicks]

On 4/24/05, Gordon JC Pearce <gordon at gjcp.net> wrote:
> Jim Beacon wrote:
> > We used to do it at work to run a 60Hz machine of a 50Hz supply, though it
> > was 3 phase in and out.
> 
> How does that work, then?
> Motor, generator and a 5:6 ratio gearbox? 1500rpm in, 1800rpm out, sort
> of thing?

I presume they are direct coupled, but each motor is of a type for the
frequency involved.  AFAIK that's done by the geometry of the stator
and the windings.

-ethan