RE: (ET) Capacitor removal...

["Elie, Larry (L.D.)" <lelie ford com>]

I use the term generically; they are oil-filled.  I doubt GE hand picked
them to better than 10%, which is 'high precision' in capacitor circles.

Larry


-----Original Message-----
From: David Roden (Akron OH USA) [mailto:roden ald net]
Sent: Friday, June 21, 2002 5:03 PM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Capacitor removal...


On 21 Jun 2002 at 16:47, Elie, Larry (L.D.) wrote:

> First, I got a GE motor-RUN capacitor, 4 micro-Farads, 660V, (I think the
330
> and 440 are OK too) same rating, style, polarity (non) and vendor as the
> original, $4 and change at Granger.  Very cheap.

You say "electrolytic," but the cap apparently shouldn't really be one.  A 
friend of mine who's an electrical engineer and an EV old-timer advised me 
strongly against using an electrolytic in a ferroresonant charger.  He was 
referring to a Lester charger, but the GE's principle is the same.  Here 
are

his words:

> They need to be high quality AC-rated dry film or oil-impregated 
> paper capacitors. NOT electrolytics or DC-rated film capacitors! 
> For efficiency, the capacitors need to have a low ESR and low 
> losses. The capacitor winding is normally wound to produce 
> high voltages, so 330vac to 660vac rated capacitors are 
> normally used.
> 
> The capacitance value is critical if you want good regulation. 
> They usually use 2% to 4% accuracy, or hand-pick the capacitor 
> to trim the output voltage to the desired value.
> 


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea 36vdc
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