[GreenKeys] KSR35 : What kind of motor is this?

[Bruce Gentry]

With a synchronous motor, the speed is determined by power frequency.  
With regard to voltage,  almost any 50 cycle motor can be run on 60 
cycles, but the speed will be higher and gearing needs to be changed. 
Operating a 60 cycle motor on 50 can sometimes cause overheating. The 
synchronous motors in teleprinters are often designed to get every bit 
of power out of the smallest package, and operating one on a lower 
frequency at the higher frequency voltage will usually cause 
overheating. Reducing the voltage proportionally is usually all that is 
needed to avoid overheating- use 5/6 of the 60 cycle voltage. Speed  has 
to be addressed with gearing changes.


      Bruce Gentry, KA2IVY


On 6/25/19 6:55 PM, Ralph Mowery wrote:
>
> Most  50 Hz motors will run fine at 60 Hz, however they will run 
> faster.   For something like a washing machine  there is usually no 
> problem.  For the teletype machines and other devices that depend on a 
> certain motor speed, the gears need to be changed if you can find the 
> correct gears.
>
> You can buy a veritable frequency drive for small motors and set the 
> speed of the motor to what you need. With that you  can probably use 
> whatever motor you have .  Even run the motor faster or slower to do 
> different speeds.
>
> Ralph ku4pt
>
> *From:*greenkeys-bounces at mailman.qth.net 
> [mailto:greenkeys-bounces at mailman.qth.net] *On Behalf Of *Thomas 
> Tillson via GreenKeys
> *Sent:* Tuesday, June 25, 2019 6:18 PM
> *To:* paul0926 at comcast.net; ka2ivy at verizon.net; greenkeys at mailman.qth.net
> *Subject:* Re: [GreenKeys] KSR35 : What kind of motor is this?
>
> From J. Haynes July 5th 2018: A 50 Hz motor should work fine on 60 Hz 
> power - it's the other way you
> can't go (because not enough iron in the 60 Hz motor to run it on 50.)
>
> *Tom WB2TTY*
>
> In a message dated 6/25/2019 5:34:58 PM Eastern Standard Time, 
> paul0926 at comcast.net writes:
>
> There was a thread a year or so about motors designed for 60Hz being 
> used on 50Hz and vice versa. One way works, one way does not. I cannot 
> recall which.
>
> Paul
>
>
>
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