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Re: [Amps] motor run cap

To: <kg7hf@comcast.net>
Subject: Re: [Amps] motor run cap
From: Rick Stealey <rstealey@hotmail.com>
Date: Fri, 8 May 2009 13:57:37 +0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>

>  Although I do have a sprague 4.7uF 450V non polarized cap in my junk box 
> (K2XT did you send me those?), not quite the 4uF the data sheet is asking 
> for. 
>

I think I sent you a heavy current cap to be used as a feedthrough for filament 
voltage, didn't I?  Don't really remember.

I think that idea of getting a proper motor capacitor at a supply shop is a 
good one.  
Those caps cause a phase shift between windings on a motor, so one winding 
pushes and the other one pushes a little later.  So they need to be able to 
take a bit of current.  On a rotor we can probably get away with a lossy one 
but on a blower that thing has to work continuously, so best to get a nice 
modern, efficient one is my two cents.

Rick  K2XT

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