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 (DIR) Return to: General Discussion - Dynamos, Generators, Alternato...
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       #Post#: 34036--------------------------------------------------
       Early Motor-Generator Demonstrator
       By: crazydoug Date: January 26, 2021, 10:18 am
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       This early motor-generator demonstrator was purchased at Cabin
       Fever several years ago.  It did not stay in my collection for
       long, due to the fact that my son saw it and decided that it
       needed to be on his shelf, rather than mine.
       Its purpose was to demonstrate its use as both a motor and a
       generator by changing the energized field and the position of
       the brushes on the commutator.  While it was in my possession, I
       could get it to run as a motor, but was never able to get it to
       operate as a generator.  Despite the fact that my son is an
       electrical engineer, we have still never been able to figure out
       how to get it to work as either an AC or DC generator, which it
       is evidently capable of either. I guess modern electrical
       engineering degrees don't include a course in early motors and
       generators!
       It is still quite a nice example of an early demonstration
       device.  Made of cast iron, it is quite heavy and a great
       display piece.
 (HTM) https://youtu.be/tJTZCtrs5Fo
       #Post#: 34057--------------------------------------------------
       Re: Early Motor-Generator Demonstrator
       By: Steam Technology Date: January 26, 2021, 4:26 pm
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       What a great historical piece you have there Doug.
       As it does not have permenant magnets and the crank is not
       geared the output as a generator will be tiny.
       It was probably used with a galvanometer wired to show output as
       well as direction change.
       #Post#: 34091--------------------------------------------------
       Re: Early Motor-Generator Demonstrator
       By: parallelmotion Date: January 27, 2021, 7:29 am
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       Beautiful motor Doug. I notice it has multiple commutators and
       looks like the brushes can be moved around--what does that
       achieve?
       #Post#: 34093--------------------------------------------------
       Re: Early Motor-Generator Demonstrator
       By: crazydoug Date: January 27, 2021, 7:38 am
       ---------------------------------------------------------
       [quote author=parallelmotion link=topic=3626.msg34091#msg34091
       date=1611754142]
       Beautiful motor Doug. I notice it has multiple commutators and
       looks like the brushes can be moved around--what does that
       achieve?
       [/quote]
       with the brushes in the position shown in the video, it runs as
       a motor. By moving the brushes to the rear positions, and some
       different wiring configuration, it can generate either a/c or
       d/c current.
       #Post#: 34094--------------------------------------------------
       Re: Early Motor-Generator Demonstrator
       By: crazydoug Date: January 27, 2021, 7:42 am
       ---------------------------------------------------------
       [quote author=Steam Technology link=topic=3626.msg34057#msg34057
       date=1611700010]
       What a great historical piece you have there Doug.
       As it does not have permenant magnets and the crank is not
       geared the output as a generator will be tiny.
       It was probably used with a galvanometer wired to show output as
       well as direction change.
       [/quote]
       I wish I had an early galvanometer! It did actually read about
       .2 volts on my meter, so maybe it is working, just not what I
       was expecting. Thanks,
       Doug
       #Post#: 34134--------------------------------------------------
       Re: Early Motor-Generator Demonstrator
       By: Steam Technology Date: January 27, 2021, 4:36 pm
       ---------------------------------------------------------
       [quote author=crazydoug link=topic=3626.msg34094#msg34094
       date=1611754947]
       [quote author=Steam Technology link=topic=3626.msg34057#msg34057
       date=1611700010]
       What a great historical piece you have there Doug.
       As it does not have permenant magnets and the crank is not
       geared the output as a generator will be tiny.
       It was probably used with a galvanometer wired to show output as
       well as direction change.
       [/quote]
       I wish I had an early galvanometer! It did actually read about
       .2 volts on my meter, so maybe it is working, just not what I
       was expecting. Thanks,
       Doug
       [/quote]
       There are some on ebay both old and new.
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