Amps
[Top] [All Lists]

Re: [Amps] For cats sake!

To: amps@contesting.com
Subject: Re: [Amps] For cats sake!
From: "Will Matney" <craxd1@verizon.net>
Reply-to: craxd1@verizon.net
Date: Mon, 06 Mar 2006 08:31:22 -0500
List-post: <mailto:amps@contesting.com>
I need to clarify one thing I said below. That doesn't mean adding a variac set 
up as a choke to the secondary HV side, it means to use a regular choke. I 
don't think I'd want to handle a variac with 3000 Vac on it.

Best,

Will


*********** REPLY SEPARATOR  ***********

On 3/5/06 at 11:11 PM Will Matney wrote:

>Bill,
>
>It's according to how you hook it up. If you connect one end of the
>variacs winding to the line, and the output to the wiper (going to the
>load), leaving the other side of the variacs winding unconnected, you have
>a variable choke. All it is, is a round iron core toroid, with magnet wire
>wrapped around it, and a wiper running across the bare magnet wire on the
>back side. If you use both ends of the coil (both to the line), and the
>wiper as out, you have a variable autotransformer. It will work either
>way. Generally, I always use them as a variable choke, and have ran
>several motors that way by converting the output AC to DC with rectifiers,
>and hooking that to a DC PM motor. All you have then is a big variable
>voltage DC supply. The old Hobart mig wire feeders worked the same way.
>That's how I powered my winding lathe too, and worked like a charm. In his
>case, he could use a choke to drop the line voltage some, however it will
>raise the current in the primary. He can use it o
> n the secondary side too providing the wire and paper in the choke can
>stand up to the HV (if it's insulated enough). Last he could buck the HV
>winding with a transformer that has a secondary of the right value. I
>personally don't like that route though because of the expense. A choke or
>variac is most likely cheaper than a transformer.
>
>Best,
>
>Will
>
>*********** REPLY SEPARATOR  ***********
>
>On 3/5/06 at 7:49 PM Bill Turner wrote:
>
>>ORIGINAL MESSAGE:
>>
>>At 04:45 PM 3/5/2006, Will Matney wrote:
>>>That or a choke with enough inductive reactance to drop the voltage 
>>>as that's all a variac is.
>>
>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>Can't believe you said that, Will.
>>
>>A variac is a transformer, not a choke. With a choke, the amount of 
>>voltage drop depends on the amount of current drawn, while with a 
>>variac it does not.
>>
>>73, Bill W6WRT
>>
>>_______________________________________________
>>Amps mailing list
>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
>
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps



_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>