Dyna-motor generator

From:  Bill Noble [SMTP:william_b_noble-at-email.msn-dot-com]
Sent:  Tuesday, May 26, 1998 1:54 AM
To:  Tesla List
Subject:  Re: Dyna-motor generator

why bother with a motor generator when you can make a perfectly adequate
inverter with an old filament transformer and a couple of transistors??
Seriously, all you need are the transformer, two transistors and four
resistors. How much power do you really need?  a 2n3055 will cary about 5
amps at 60 volts, and it's really cheap.  The old motor/generator is
probably worth more as something to put on the shelf than as a power source.

There are such things as self excited generators, back in the dark days when
I worked on airplanes, the L-1011 had such a thing, wherein a permanent
magnet got the thing started, and then one winding acted as a generator to
provide current to the other.  This eliminated the need for brushes, which
is good in an aircraft application.
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: 'Tesla List' <tesla-at-pupman-dot-com>
Date: Monday, May 25, 1998 8:39 PM
Subject: Dyna-motor generator

>From:  gweaver [SMTP:gweaver-at-earthlink-dot-net]
>Sent:  Monday, May 25, 1998 11:36 AM
>To:  Tesla-at-pupman-dot-com
>Subject:  Dyna-motor generator
>I have an antique dyna-motor generator that is fried.  I took it apart
>and unwound one of the windings.  I am trying to figure out what makes this
>thing work.  When I get it fixed I hope to run the generator on my car
>battery to get 120 vac to power a Tesla Coil.
>The armature has a DC winding with brushes.  This winding has 16 coils.
>field winding has 2 coils and is only wide enough to cover the 16 drive
>winding, not the generator windings.  These coils are not connected to the
>generator coils.  Probably 6 volt DC winding.
>The generator section is offset from the drive section about 2".
>The generator section has no field winding.  The generator has 2 sets of
>windings that turn on the armature.  One set of winding are wound with #26
>wire and the other set of winding are wound with #16 wire.  Each of these
>windings has 4 coils like a 60 HZ electric motor.  Each set of winding are
>rotated (offset) from each other, it looks like the start and run windings
>of an electric motor.  The output is from 2 circle rings and brushes.
>This is the interesting part.  The generator section has on power applied
>it internally.  It may be picking up a small amount of magnet field from
>drive section but it can't be very much because of the way its designed
>the 2 being seperate.  The #26 and #16 winding are both connected in
>parallel.  The #26 winding is connected to a centrifical switch.  As the
>armature picks up speed the switch opens and drops out the #26 winding.
>output of the generator is totally from the #16 winding.  I think the
>is suppost to be 32 vac 15 amps.  I can use a step up transformer to get
>vac or rewind the unit to produce 120 vac.
>Is the #26 winding some how energizing the generator to get it started?
>Then once it starts generating it energizes itself?
>This thing is very old.  I got it at an old antique engine show last
>It was probably built around the turn of the centery.  The original name
>is still on it.  It has nothing stamped on the name tag where it says volts
>and amps.  The volt meter goes to 50 volts and the amp meter goes to 15
>amps.  I know that many of the early generators built in those days were 32
>volts so I figure this thing is probably designed to produce 32 volts.
>The name plate says.  Fort Wayne Electric Works.  Fort Wayne Indiana.  It
>even has the serial number.
>It has 2 panel mount meters that are both broken and 2 variable resistors.
>One variable resistor says volts and the other one says amps.  One of the
>variable resistors is broken.  The wiring to the meters and resistors are
>missing.   I would like to hook this thing up without the meters and
>resistors if it will run that way.
>Does anyone know anything about this type of generator technology?
>Gary Weaver