[Diy_efi] Slightly OT: Need help designing a circuit

[Van Setten, Tim @ ACSSD]

Adam,

When you did your test for the AC voltages across the stator legs, was your
test done with the stator open circuit?
If so, then yes you would see a voltage drop across the leg that has a
problem, such as shorted winding, etc..

If the stator output is hooked across a 3-phase diode assembly AND hooked to
a load (lights, battery charging, etc.), do you still see a "Drop" in that
leg?

In normal operation, the stator output is connected as stated above.  Also,
wouldn't the "Conduction Time" across the set of diodes be less on the
damaged phase as compared to the good ones?   Just wondering.......Tim.



-----Original Message-----
From: Adam Wade [mailto:espresso_doppio at yahoo.com]
Sent: Wednesday, March 31, 2004 9:49 AM
To: A list for Do-It-Yourself EFI
Subject: RE: [Diy_efi] Slightly OT: Need help designing a circuit


--- "Van Setten, Tim @ ACSSD"
<tim.van.setten at L-3com.com> wrote:
> Adam

> The problem is that you need to be measuring current
> in each leg of the stator, not voltage.

Actually, when a leg is going bad, the AC voltage does
drop.  It's usually a short across some of the coils
in a leg that is the first sign of trouble.  I've
successfully diagnosed a large number of failing
stators by checking AC voltage between pairs of output leads.
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