Re: [APML] AC Synchronous Stepper Motor

[rbuckner <rbuckner@earthlink.net>]

Mark,

The motor sounds like a reversable 110v synchronous motor and not 
a stepper. Steppers typically have more leads and would run from 
DC stepping drivers. Not sure what you are driving it with but if it 
is ac, the motor may need a starter capacitor to function properly.


Mark Kaye wrote:
> 
>     I am servicing a focuser from an RC scope that uses an AC synchronous
> stepper motor that runs off of 120 volts to move the secondary to focus the
> telescope.  The SS25 motor from Superior Electric has just three wires.  It
> turns a threaded shaft that moves the mirror in or out.  From the look of
> things, a simple pairing of two of the three leads (white appears to be
> common to red and black) to the power line should turn the motor in one
> direction or the other.  Unfortunately, the mechanism seized at some point
> and now the motor just stutters when I wire it the way I think it should be
> wired.  I am hesitant to do extensive experimentation at this point, after
> all it is 120 volts AC I am talking about here.
>     I have done a pretty extensive web search and I finally found a page
> that makes reference to the family of motors that I think I am interested
> in.  As is usual in web searches, when I find the page that looks like it
> might have the information that I am looking for, I get a page not found
> error.  Can anyone point me in the direction of information on AC stepper
> motors or help me getting this thing to spin?
>     Clear skies!
>                 MK
> 
> http://www3.sympatico.ca/mark.kaye/
> 
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