[GreenKeys] 35-KSR motors: governed versus synchrous

[WA5CAB--- via GreenKeys]

This won't likely be the case if you buy a VFD over there, but if you buy a 
small one out of the USA, be sure to check what the input voltage is.  
Small ones are apt to be for 120 VAC input and 208 V output.  That would cost 
you two step up/down transformers.

In a message dated 08/04/2015 17:50:36 PM Central Daylight Time, 
pete at petelancashire.com writes: 
> Small single phase VFDs have dramatically dropped in price over the past 
> couple years. One need to see if the motor used in a 35 will work. VFDs 
> imposes some pretty nasty requirements on motors and can generate some really 
> fun electrical noise.
> 
> I've acquired some via Ebay good to 1/2 HP for less then $30. Good quality 
> small single phase new ones run around $100 to $250.
> 
> 
> On Tue, Aug 4, 2015 at 3:32 PM, <WA5CAB at cs.com> wrote:
> >> All that I know about M35's is that the Teletype repair men called them 
>> the "rubber band and door spring" machines.  But before you source a 
>> governed motor of any voltage, you should probably check that it uses the same 
>> gears as the 60 cps synchronous motor.  Knowing Teletype Corp, it 
>> probably didn't.  Absent finding a 220 V 50 CPS sync motor and gears, probably 
>> your best bet would be the VFD previously mentioned.  That at least you 
>> could probably buy locally.  And use a 2:1 step-down transformer with it.
>> 
>> In a message dated 08/04/2015 17:21:57 PM Central Daylight Time, 
>> pete at petelancashire.com writes: 
>> >>> An interesting project for this winter would be to play with a VFD 
>>> drive
>>> 
>>> -pete
>>> 
>>> 
>>> On Tue, Aug 4, 2015 at 3:11 PM, Jack <wa2hwj at att.net> wrote:
>>> >>>> There was a LMU-10 on Ebay for some time.
>>>> It is a series governed motor.
>>>> 
>>>> Jack K0TTY
>>>> 
>>>> 
>>>> 
>>>> -----Original Message-----
>>>> From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of 
>>>> Jim
>>>> Haynes
>>>> Sent: Tuesday, August 4, 2015 5:10 PM
>>>> To: Gabriel Egan <mail at gabrielegan.com>
>>>> Cc: greenkeys at mailman.qth.net
>>>> Subject: Re: [GreenKeys] 35-KSR motors: governed versus synchrous
>>>> 
>>>> There exists a 50 Hz 230V sync motor for Model 28/35.  Of course it 
>>>> needs
>>>> different gears from the 60 Hz units since the speed is 3000 RPM rather 
>>>> than
>>>> 3600.
>>>> 
>>>> If you are looking for a governed motor, the ones for Model 28 and 
>>>> Model
>>>> 35 are the same.  I'm not sure if a 60 Hz governed motor will speed up 
>>>> to
>>>> 3600 RPM so that 60 Hz gears can be used.
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>>> 
>> 
> 
> 
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20150804/f45b9185/attachment.html>