[TheForge] that tired old phase converter question again

Wed Jun 26 22:03:01 2002

There is one in the Metal Web News link. I don't remember myself; I go 
there to look it up. You really don't need to tune them unless you're 
interested; the rule of thumb on capacitance works pretty nicely.

http://www.metalwebnews.com/howto/ph-conv/ph-conv.html

Steve

Darrell wrote:
> Do you have a rule of thumb for how much capacitance to start with for a given
> idler motor HP?
> 
> Darrell
> 
> http://www.machinemaster.com
> 
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> 
> ----- Original Message -----
> From: "Steve Smith" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, June 25, 2002 9:29 PM
> Subject: Re: [TheForge] that tired old phase converter question again
> 
> 
> 
>>Exactly. The idler motor goes in parallel with your load motor (with
>>appropriate switching). You have a very simple means to put together a
>>rotary converter (or two). Just adding an idler should improve your
>>chain fall quite a bit (but check it...). Adding capacitors (rule of
>>thumb given in article previously mentioned) will improve things even
>>more. Not so much a matter of efficiency as balancing the current in the
>>motor windings. You basically want to add capacitors until the voltages
>>from each side of the single phase to the third leg are about 10% higher
>>than the single phase itself. This gets you pretty close to balanced
>>under load.
>>
>>It is looking like our move will be next summer. I'll keep you (and
>>others) posted.
>>
>>Steve
>>
>>Ralph Sproul wrote:
>>
>>>        Steve, So your saying you just put this idler motor between the
>>>static unit and the load you are trying to supply??   Just curious as I have
>>>two of those static units and don't really hvae a need for them.   Wondering
>>>if this would improve the efficiency of them as I used a static on a chain
>>>falls once, and it would heat the motor to the point I stopped using it for
>>>fear of destroying a nice electric chain falls.
>>>        Nice to meet you in Wisconsin, let me know when your heading east
>>>some time, or if you move.
>>>
>>>Ralph Sproul - Bear Hill Blacksmith
>>>Webster, NH
>>>
>>>
>>>
>>>----- Original Message -----
>>>From: "Steve Smith" <[email protected]>
>>>To: <[email protected]>
>>>Sent: Monday, June 24, 2002 10:17 PM
>>>Subject: Re: [TheForge] that tired old phase converter question again
>>>
>>>
>>>
>>>
>>>>If you want a rotary converter but don't want to build it, all you need
>>>>to do is get a static phase converter and use it to start an idler
>>>>motor. Now you have a rotary converter.
>>>>
>>>>Steve Smith
>>>>
>>>>Mark A. Pesetsky wrote:
>>>>
>>>>
>>>>>I did a search to see how much a purchased phase converter would be
>>>>
>>>because
>>>
>>>
>>>>>I
>>>>>may need one in the near future as well.  I found that they are
>>>>
>>>expensive
>>>
>>>
>>>>>but
>>>>>I also found a company that builds a panel that you hook up to your own
>>>>>idler
>>>>>motor.  The $325 for the panel sized for a 10hp motor might not be that
>>>>>much
>>>>>more than all the componnents you would need  to buy.
>>>>
>>>http://www.n-e-m.com
>>>
>>>
>>>>>John Newman
>>>>>
>>>>>Gladish Family wrote:
>>>>>
>>>>>Been buying motors and inverters from these people for a while
>>>>
>>>now...GREAT
>>>
>>>
>>>>>people to work with.
>>>>>Look under the "Inverter Drives" section...If you don't see what you
>>>>
>>>need,
>>>
>>>
>>>>>give them a call. They don't always list all that they have in stock..
>>>>>
>>>>>Good Luck
>>>>>Mark
>>>>>
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>>>>>
>>>>>
>>>>
>>>>
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>>>
>>>
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>>
>>
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> 
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