Yep, I made some custom stuff to line it all up, put the stuff where I could
find it if needed. Bolt came loose on the rotor, %$##%%$ have to realign,
but guess what...? can't find my align hardware and don't remember how I
made it to begin with. Ended up making it all again and this time documented
it with the camera. That is what happens when you get old. Later on
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Lux, Jim
Sent: February 15, 2021 1:14 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] sync motor
On 2/15/21 9:48 AM, Gary Gaspar wrote:
> Shuan yes it is a hard thing now to find. Can give problems finding the
> sweet spot. My comment had fun with strobe light & the SRSG with the sweet
> spot.
>
> On Sun, Feb 14, 2021 at 10:19 AM shaun <snoggle@xxxxxxxxxxxxxx> wrote:
>
>> I have read the archives for days looking for leads on cheep sync motors,
>> always day or several years too late to get in on the action. I have been
>> looking at the oriental motors that are synchronous but don't lock at the
>> same phase each time, so I would have to use a 1800 rpm with 4 contacts
for
>> 120 bpm so where ever it locked would be in sync, assuming 90 degree
locks.
>>
Yeah, there's not much in the way of things using synchronous motors
these days(do they even make teletype machines any more?), so the
surplus is drying / dried up.
I wonder if one could use a variable speed drive (they're fairly
inexpensive now) and a regular induction motor (or a PSC), with some
sort of feedback control to keep the phasing (the load on a rotary gap
is pretty constant, so you should be able to slowly "drift" the phasing
by running it slightly slow or fast.
One might also be able to use a *big* stepper or variable reluctance
motor, but like sync motors, those are less common these days as surplus.
I've always wanted to really explore a triggered blast gap, but haven't
had the time over the years. One should be able to reliably fire it at
any desired phase.
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