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I do not have the direct answer to your question,
it would be too long, however, the first two cars I owned had a
starter-generator set up. The first one was a 700cc DKW model 1938 and the other
one was a 1949 DKW, sort of a post war successor. Both were two cylinder two
strokes. It had an outside armature on the crank shaft with a set of brushes on
a disc type commutation. Once the engine was running, it worked as a generator
through a separate exciter winding in the stator, controlled through the voltage
regulator. The windings on the armature were used as starter and generator.
There was frequently a problem with cranking,
because it was loosing torque with the slightest voltage drop in the
system.
I do not believe that such a system could be built
competing, at least weight wise, with a gear reduction starter motor. As a mater
of principle, a high torque electric motor is always heavier than a high speed
motor producing the same torque through gear reduction. And, of course, at the
same hp.
FWIW.
Richard Sohn
N2071U
----- Original Message -----
Sent: Tuesday, June 03, 2008 5:28
PM
Subject: [FlyRotary] combined starter
alternator
Directed to the electronic wiz
types.
This is not a development issue but an
educational issue as I would like to
understand the issues associated with developing a starter
alternator.
Personally I believe a combined starter,
alternator, flywheel, damper, timing wheel and pick up would be a great
advantage (we live to dream).
Some systems use the combined starter alternator
attached to the gear box shaft just, between the motor and the gearbox fluid
damper.
I believe from talking to Bill Jepson that
getting sufficient power from the current winding used is problematic but
that there had been major improvements in this field. Also reading a little on
the Internet ( if I understand it correctly) an alternator is AC ( alternating
current) and a generator is DC. As Batteries are DC and starters are DC, we
would need to use a DC generator winding in the starter generator (someone
tell if I'm wrong here).
Of course nothing is as simple as this, so I'm
keen to understand the issues associated - from anyone out there in the
electronics world!?
George (down under).
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7:31 PM
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