phase converters for big iron

[Gordon JC Pearce]

Jim Beacon wrote:
> From: "Brian Knittel" <brian at quarterbyte.com>
> 
> 
>>Hi,
>>
>>Does anyone have any experience using motor-generator
>>phase converters to produce 3 phase power from single
>>phase power for running big iron? (e.g. IBM mainframe
>>equipment). They seem reasonably priced -- about $1 per
>>peak KW, at least on sale: http://www.phaseconverter.com
>>
>>I'd appreciate hearing from anyone who has actual
>>real experience with or knowledge about this.
>>
>>Thanks
>>Brian
>>
> 
> 
> We used to do it at work to run a 60Hz machine of a 50Hz supply, though it
> was 3 phase in and out.
> 
> Jim.

How does that work, then?
Motor, generator and a 5:6 ratio gearbox? 1500rpm in, 1800rpm out, sort 
of thing?

Gordon.