Re: Generator info sought

Kim, I'd say from the resistance of the regulator (if that says 0.4 ohms)
that a 12V battery across the field should do the trick if it's gone flat,
like wot Martin says. When you polarise a dynamo, put a bleed resistor (in
this case say a headlamp bulb) across the winding, to avoid damaging the
insulation with a high voltage kick when you break the battery circuit. You
might like to check a few things first though: Lift the DC brushes off the
com and check for a field circuit of a few ohms between them. Make sure it's
going at full speed, it probably won't do anything much below 3000 rpm. Also
check for shorts on the AC side, as it may not self-excite into a short
circuit, which is a good thing. Has it definitely worked with that engine?
If not, it could be rotating the wrong way, which doesn't matter on some
alts, but this is like a shunt dynamo with an extra AC winding and the
polarity of the shunt field connections to the com depend on the direction.
HTH
Lucien


"Oily" <martin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote > I reckon the comm is
just a dc exciter and the output control is just manual
> field regulation for the load and with it being stood for a long time
> there's still no residual magnetism even for the dc to start. I *still
> *think it needs waking up with a battery!
>
> Martin
>
>


.

Relevant Pages

  • Re: LED Buffer Circuit
    ... than 3kHz & it can't draw much current from the input. ... resistor at 5V, it shows typical resistance of 10 ohms, which with the ... just like to add a 5V regulator to the entire circuit. ... put a linear device in there & give up that battery life to heat. ...
    (sci.electronics.design)
  • Re: Measuring amps on 9 volt battery
    ... >confirm with a 9V battery, ... >Using letter R to represent ohms, showing Law and actual MM readings ... resistance of the battery. ...
    (sci.electronics.basics)
  • help: 300sd alternator
    ... Battery in a 1982 300SD died the other day, so I took a multi-meter to ... The voltage regulator seemed to be working: ... The voltage regulator only has a over all resistance of 7 or 10 ohms, ...
    (alt.auto.mercedes)
  • Re: help: 300sd alternator
    ... It turned out that the alternator was partially shortted: the resistance between the two battery cable poles was in the teens with the battery disconnected and alternator connected, the resistance with the alternator disconnected was infinity. ... The voltage regulator seemed to be working: ...
    (alt.auto.mercedes)
  • Re: Continuing E30 Charging problems
    ... It is in the current path from the battery voltage ... I checked the resistance on my car ... from the alternator body to the battery ground cable end that's ... I got 0.3 ohms. ...
    (alt.autos.bmw)
Loading