[GreenKeys] Need motor for 50Hz supply (or DC)

[Brenda Gentry]

Consider a small Variable Frequency Drive. Most can be set wherever you 
like  for voltage and frequency, many will accept a single phase power 
input and load.

    Brenda Gentry

On 9/3/26 2:26 PM, Malcolm Macleod via GreenKeys wrote:
> Greetings all.
>
>   
>
> I have a 115V/60Hz Model 28 KSR that I imported to Australia some years
> back.  My aim is to get this working on our local mains supply (230V 50Hz).
> I'm happy to use a 230V/115V stepdown transformer if needed.  The bigger
> issue is the change in mains frequency, and possibly gear change if the new
> motor speed is 3000RPM (rather than 3600RPM).
>
>   
>
> Wondering if anyone can help with a suggestion as to which motor(s) and/or
> gear sets I should be looking for.
>
>   
>
> The main resource I've been looking at is Teletype Corp bulletin 295B
> (particularly page 67) ->
> https://www.navy-radio.com/manuals/tty/295B-7012.pdf
>
>   
>
> Option 1: Am I able to run the existing 60Hz synchronous motor at 50Hz and
> just change the gear set to accommodate the reduced RPM?  If so, what gear
> set do I need for 45.4Bd/60WPM at 3000RPM?  I remember trying this a decade
> ago on an ASR33 and it wasn't successful due to excessive heating of the
> motor.
>
>   
>
> Option 2: Might I be able to run a 115V/60Hz 3600RPM series governed motor
> on 50Hz?  If so, it seems I should be looking for an LMU4, LMU6, LMU41,
> LMU57 or LMU61.  If it's acceptable to use an ASR motor in the KSR, then the
> additional options (for 115V/60Hz) seem to be LMU14, LMU39 or LMU61.
>
>   
>
> Option 3: If it's not OK to run a 60Hz series governed motor at 50Hz, then
> the 115V/50Hz options seem to be LMU38 or LMU50, though these will run at
> 3000RPM.
>
>   
>
> Option 4: I would also be fine of course with an LMU55 (230V/50Hz), though I
> don't think I will be lucky enough to find one of these, and a gear change
> would be necessary as well.
>
>   
>
> Option 5: Another alternative seems to be an LMU29 (Series governed
> 48V/3600RPM).
>
>   
>
> If you have any of these motors that you might be willing to sell, or
> otherwise can shed some light in how to solve this problem, please let me
> know.  I'm in the U.S. for the next couple of weeks, so can easily take one
> back with me if there's one available there.  Similarly interested in
> anything that might be available in Australia or the U.K. for local
> shipping.
>
>   
>
>
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