[GreenKeys] 14-15-19 Etc. motor

[Pete Lancashire]

Well if anybody really needs a motor I have a couple that are sitting by
themselves I don't know the condition but the price would be oh I don't know
$1 each ? The issue is I can't even lift one nowadays. And they are either
in Portland Oregon or Banks Oregon.

If in Banks and if interested the next time I'm there I could have somebody
put them in the truck.



On Thu, Jul 5, 2018, 1:26 PM Ralph Mowery <rmowery28146 at earthlink.net>
wrote:

> After taking a close look at things, I see the light.
>
> The motor in question is a 50 hz motor,but it only runs at 1500 rpm so when
> running at 60 hz it will run at 1800 rpm.
>
> This motor is rated for 110 volts, so should work ok in the US if the
> correct gears are used.
>
> Not having a 50 hz motor in hand, I just wonder if
> Teletype put enough iron in the motors so they would run at 50 or 60 hz and
> just slapped on the name tag whatever they needed for the countries power
> grid and made gears to make up the difference ?
>
> Iron and air flow does make a difference.  With enough air flow for cooling
> it may be possible to run the 60 hz motor at 50 hz.
>
> -----Original Message-----
> From: Jim Haynes [mailto:jhhaynes at earthlink.net]
> Sent: Thursday, July 05, 2018 3:47 PM
> To: Ralph Mowery
> Cc: GreenKeys at mailman.qth.net
> Subject: Re: [GreenKeys] 14-15-19 Etc. motor
>
> It's really quite simple.  The 50 Hz motor will turn at 1800 rpm when
> powered by 60 Hz.  The only difference in the motors is the extra iron
> needed to work at 50 Hz.  1800 RPM is the same speed the 60 Hz motor runs.
> Teletype gear sets are not permanent parts of the motor, so a gear set
> for any 60 Hz speed will work equally on a 50 Hz motor running on 60 Hz
> power.
>
> If you ran a 60 Hz motor on 50 Hz power the speed would be 1500 rpm and
> the motor would overheat from lack of iron causing excessive currents
> in the winding.
>
> Of course this is all about synchronous motors.  Speed governed motors
> are a different matter altogether.
>
> Now there's also the matter of line voltage, since 115V more or less is
> the standard in the U.S. but 230V is the standard in Europe where 50 Hz
> power is commonly used.  I neglected to mention that in the earlier
> posting.  If it's a 230V motor you can run it in the U.S. by hooking
> across the two "hot" leads of the power system rather than one hot and
> one neutral as is standard for all 115V appliances.  Or you could use a
> step-up transformer.  The line voltage should be printed on the motor
> nameplate.
>
>
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