[TheForge] 15Ton Press

[Peter Fels and Phoebe Palmer]

At 05:10 AM 1/6/02, you wrote:

Seems to me that the vfd could have a bunch of other interesting 
applications as well....Pete




>Hi Steve,
>
>I think it kinda cool that if I start out with an 1800 rpm 3hp motor and 
>use the VFD to double the speed to 3600, the motor's output torque will 
>meet or exceed a 5hp 3600 rpm motor to satisfy the demand of the pump.  (I 
>only need 2.5hp to run at 1800 so 5hp will handle double the hp of the 
>pump at 1800.)  The local motor repair place does it often.  I can get a 
>5hp VFD factory refurbished for the same price as a new 3hp VFD (about 
>$360).  So I'll start with one of the 3hp motors I got and if that's not 
>kosher for whatever reason I'll scrounge or buy a used 5hp for $80.
>
>The other option would be to make a phase converter and run a 3hp motor I 
>have.  Say $80 for the extra motor plus $70 for the phase converter 
>electronics (I think - correct me if I'm wrong).  So I'm paying $210 for 
>the ability to run the wood splitter and tune-in the speed of my press.  I 
>also have thoughts about wiring a switch in that would allow me to use the 
>VFD to run the power hammer motor.  I've always wanted to play with the 
>rpm of that thing.
>
>All in all, I don't know if it's wise or not, but it seems worth the 
>experience and possible benefits.  If I don't have to do anything exotic 
>with my cylinder porting I'm getting off pretty cheap on this press so the 
>extra $210 doesn't make me whine to much.
>
>Ed
>
>
>>If you double the speed, you also double the HP required out of the 
>>motor. I don't
>>know if this is a wise idea.
>>
>>Steve
>>
>>Ed Fasula wrote:
>>
>> > Hi Steve,
>> > I'm thinking that I'd like the variable speed so that I can double speed
>> > the motor for splitting wood or if I want to go quicker.  Thanks tho.
>> >
>> > Ed
>
>
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