That does sound like a cheaper alternative. I used to do that trick with 
Hatachi drives to power up vibratory feeder bowls that came tuned to 50 
herz and would not run in the US on 60 herz.

I think I try and tune my 10hp phase converter using the new information 
I have on tuning a rotary phase converter and see what the result from 
that is.

John

On 5/25/2012 2:51 PM, Dave wrote:
> On 5/25/2012 1:33 PM, Peter C. Wallace wrote:
>> On Fri, 25 May 2012, andy pugh wrote:
>>
>>
>>> Date: Fri, 25 May 2012 18:19:39 +0100
>>> From: andy pugh<bodge...@gmail.com>
>>> Reply-To: "Enhanced Machine Controller (EMC)"
>>>       <emc-users@lists.sourceforge.net>
>>> To: "Enhanced Machine Controller (EMC)"<emc-users@lists.sourceforge.net>
>>> Subject: Re: [Emc-users] Commutating Reactor
>>>
>>> On 25 May 2012 18:00, Dave<e...@dc9.tzo.com>   wrote:
>>>
>>>
>>>> For only generating 1 phase (the missing leg) they are charging some
>>>> serious money for those inverters.
>>>>
>>> They are doing rather more than a typical inverter drive does. They
>>> create a smooth 3-phase waveform regardless of load.
>>>
>>
>> I wonder if a VFD (with suitably tweaked parameters) and 3  inductors would
>> do. I suspect VFDs have fairly low switching frequencies (say 4-10 KHz) so
>> would need a fair amount of filtering
>>
>> Peter Wallace
>> Mesa Electronics
>>
>>
>>
> Many 3 phase input VFDs will run if only two of the phases are connected
> - in other words they will run on single phase power.   Usually the
> control voltage comes off of only two of the phases.
>
> I saw a web article a few months ago where a guy had connected a VFD to
> single phase and in order to fake out the VFD so it would function, he
> connected the third input leg to one of the other input legs via
> a power capacitor (metal can - continuous duty, etc) .   I didn't save
> that link.
>
> If you put a filter choke (line reactor) after the VFD it would smooth
> the power output substantially.   When I was with Siemens we had who did
> this and the standard recommendation was to oversize the VFD by 30-40%.
> But this was for smaller motor applications back then - 3-5 hp etc.
> This was before cheap single phase input VFDs were available for 5-7.5
> hp motors.
>
> Automation Direct has a 20 hp 230 volt input VFD for about $1100.   Add
> a line reactor for another $160 and give it a shot.    They have a 30
> day return policy.   Plenty of time to figure out whether or not you can
> jury rig it into working.
> and a  lot cheaper than a PhasePerfect.
>
> http://www.automationdirect.com/adc/Shopping/Catalog/Drives/DURApulse_-_GS3_%28230_-z-_460_VAC_Sensorless_Vector_Control%29/DURApulse_-_GS3_Drive_Units_%28230_-z-_460_VAC_SLV%29
>
> We'd all cheer you on if you want to try this.  :-)
>
> Dave
>
>
>
>
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