Posted by daestrom on April 28, 2005, 4:43 pm
>> DJB/E have no brushes....they use a Brushless generator.....It is a
>> For Real Genset, not one of the 3600 Rpm Toys....
> Then (drawing on my limited knowledge of this subject) it must either
> be a PM generator or a squirrel cage-type head. How do you regulate those
> types of heads? Do you agree with Ig that the regulator is a probable
> source of the problem?
Naaa, You'd be surprised what can be done with a few diodes ;-)
The idea is you actually have a second tiny generator right inside the main
one. A different coil on the rotor has a voltage induced into it, which is
rectified by diodes mounted in the rotor. The DC from them feeds the main
field on the rotor, to provide the magnetic field for the main generator.
So if you regulate the small fixed field that the 'exciter coil' is spinning
in, you control its output, which is the input to the main generator's
field. No brushes, just a small field control of the field that the exciter
coil is spinning in.
daestrom
Posted by Vaughn on April 28, 2005, 7:01 pm
> Naaa, You'd be surprised what can be done with a few diodes ;-)
> The idea is you actually have a second tiny generator right inside the main
> one. A different coil on the rotor has a voltage induced into it, which is
> rectified by diodes mounted in the rotor. The DC from them feeds the main
> field on the rotor, to provide the magnetic field for the main generator.
> So if you regulate the small fixed field that the 'exciter coil' is spinning
> in, you control its output, which is the input to the main generator's field.
> No brushes, just a small field control of the field that the exciter coil is
> spinning in.
Good explanation. Thanks!
Vaughn
Posted by samuelchamb on April 26, 2005, 2:48 pm
is the engine hunting ? (slowing down then speading up)
Ignoramus21174 wrote:
> I posted earier that my UPSes did not like my generator.
>
> I ran it again recently and have a better understanding of the
> problem. The power provided by my generator is not quite stable.
>
> Once every 2 seconds or so, lights noticeably flicker. That's what
> makes UPSes switch to and from their batteries.
>
> The house can run on the generator, but not quite exactly the way I
> want.
>
> Based on mechanical consideration, this should be more likely a
> problem with electronics of the generator, than with its engine. But I
> would like some comments.
>
> i
Posted by Ignoramus21174 on April 26, 2005, 3:06 pm
On Tue, 26 Apr 2005 19:48:12 +0100, samuelchamb
> is the engine hunting ? (slowing down then speading up)
Does not sound ike it, although, I will try to check it more
carefully. It seemed more of an electronics problem.
i
> Ignoramus21174 wrote:
>> I posted earier that my UPSes did not like my generator.
>>
>> I ran it again recently and have a better understanding of the
>> problem. The power provided by my generator is not quite stable.
>>
>> Once every 2 seconds or so, lights noticeably flicker. That's what
>> makes UPSes switch to and from their batteries.
>>
>> The house can run on the generator, but not quite exactly the way I
>> want.
>>
>> Based on mechanical consideration, this should be more likely a
>> problem with electronics of the generator, than with its engine. But I
>> would like some comments.
>>
>> i
--
Posted by Tim Keating on April 27, 2005, 2:35 am
On 26 Apr 2005 15:17:21 GMT, Ignoramus21174
>I posted earier that my UPSes did not like my generator.
Your primary connection wires appear to be undersized and the
wrong(*) type. P.S. Throw out the code book on sizing genny wire
connections. The NEC is based on allowable voltage drops and power
losses, which yields unacceptable results in many power production
applications.
Oversize your primary generator wire connections by at least two wire
gauges (copper).
(*)Note: Any electrical connection which is subject to significant
vibration or movement should be connected via stranded copper wire
encased in a liquid tight flexible conduit. Also helps to reduce
mechanical stress on the wire termination points.
>I ran it again recently and have a better understanding of the
>problem. The power provided by my generator is not quite stable.
Also plug a couple of 60 watt incandescent light fixtures on the
gen ny output as a constant minimum load.
>Once every 2 seconds or so, lights noticeably flicker. That's what
>makes UPSes switch to and from their batteries.
>The house can run on the generator, but not quite exactly the way I
>want.
Had a similar problem with my Tripplite APS912's after hurricane
Frances. (Too much wire run + too small of gauge == cycling problems.)
>Based on mechanical consideration, this should be more likely a
>problem with electronics of the generator, than with its engine. But I
>would like some comments.
see above..
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>> For Real Genset, not one of the 3600 Rpm Toys....
> Then (drawing on my limited knowledge of this subject) it must either
> be a PM generator or a squirrel cage-type head. How do you regulate those
> types of heads? Do you agree with Ig that the regulator is a probable
> source of the problem?