[Milsurplus] A generator question...
James Whartenby
antqradio at sbcglobal.net
Tue Oct 24 18:14:34 EDT 2017
Do a Google search for "replacing pull starter with electric starer"; there are several YouTube videos that show how it can be done. No sense reinventing the wheel! It can be as simple as using a battery powered drill and a 7/8 inch socket!Jim
From: Bruce Gentry <ka2ivy at verizon.net>
To: Milsurplus at mailman.qth.net
Sent: Tuesday, October 24, 2017 4:17 PM
Subject: Re: [Milsurplus] A generator question...
The only type of generator that can be motored to roll an engine is one
with a DC communtator. Applying power to the field alone will not do
anything. I had a PE-75 and used batteries to start the engine as you
have. HOWEVER, the field is connected to the DC brushes and armature.
Newer generators do not have DC communtators,, they use small permanent
magnets to give enough excitation to produce a small output. This weak
AC output is rectified and fed into the rotating field to cause the
generator to build up to full voltage. The only practical way to start
these electrially is to add an electric starter if the engine can accept
one. Te newest generators use an inverter, the rotating field is
permanent magnet. Electric starting is possible, but would require a
total re-design of the inverter circuits and probably a 24 or 36 volt
battery.
Bruce Gentry KA2IVY
On 10/24/17 10:00 PM, Kenneth G. Gordon wrote:
> This may be the wrong forum for these questions, but this forum has such a wide variety of
> very skilled people here that I thought I would try here first.
>
>
> The PE-95 used a somewhat unique method of starting the gasoline engine: it "motored" the
> generator by applying 12 VDC from two large 6 VDC batteries connected in series, to the
> field winding of the generator. The generator would then act like an electric motor and turn
> the armature, which was connected to the jeep engine, eventually starting it. The process
> was totally silent in operation. The field winding then would also charge the batteries.
>
> As I remember it, this "motoring" action by the generator was actually fairly weak, but the
> generator, being large, did the job.
>
> I once used this same method to start a much smaller PE-75, 2500 watt generator which
> had a 10 HP B&S engine on it. I used a 12V car battery, applying that voltage to the
> terminals of the field winding which were reachable under the cover on one end of the
> generator.
> I now own a more modern generator, a Champion Power Equipment 5500 watt job, which I
> have had for 10 years, and which uses a 11 hp single-cylinder Honda clone which is started
> by means of a rope and recoil mechanism.
>
> I recently was given the schematic diagram for this generator, and see that it is NOT an
> "inverter" type, but is a genuine real generator with two "Main" windings, a "Field WInding",
> an "Exciter winding" (which feeds an Automatic Voltage Regulator module), and an auxillary
> "DC winding" which provides 12VDC (hrough an internal full-wave bridge rectifier) to charge
> a battery.
>
> So....I am wondering if anyone here has attempted to use the field winding of such a
> generator to "motor" it, and if so, what were your results?
>
>
> Ken W7EKB
>
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