[TheForge] air hammer

[James Binnion]

Hey Pete,

Not really true, sure if you use the in expensive "solid state" phase  
converters that are nothing but a few capacitors then this the result  
you will get. But a properly sized and built rotary phase converter  
will get you to at least 95% or better of the nameplate HP and an  
inverter type converter like the VFD's are full name plate power  
devices with the added bonus of speed control. So it all depends on  
how you do it. For anything over 5HP you will probably be limited to  
rotary types but they work fine and I have seen them up to 25 HP but  
you will need one hell of a single phase circuit to run one of those :-)

Jim

On Nov 3, 2008, at 4:59 PM, Peter Fels & Phoebe Palmer wrote:

> An addendum; Converting a 3 ph to single phase looses about 1/3 of  
> the power. There's a good argument for using jack shafts, pullys and  
> belts to get the right RPM and HP with an inexpensive 1 Ph motor..pf

James Binnion
jbin at well.com