It turns a 10 inch 1/2 inch thick G10 rotor with 4 flying electrodes at 3600 RPM with no problem.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Tedd Dillard" <tedd.dillard@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, February 16, 2021 9:37:06 AM
Subject: Re: [TCML] sync motor
Thank you Steve I also have that information and am planning on building
one that way. I was looking for feedback on performance as I have also
heard about difficulties. I am glad to hear from someone that has actual
satisfactory experience with the design.
Thanks
Teddy
On Tue, Feb 16, 2021, 10:27 AM Steve White <steve.white1@xxxxxxxxx> wrote:
> I have a synchronous motor made that way and it works great. It has two
> flats machined 180 degrees apart. You really need a milling machine to cut
> the flats. My motor started as a standard 1/2 HP 3550 RPM induction motor.
> For a 1750 RPM induction motor as a starting point you need to cut 4 flats
> spaced 90 degrees apart. There are some guidelines buried in the archives
> about how deep and where to make the cuts. I actually have some PDF and JPG
> files of the guidelines but since we can't attach files I can't post them
> on this board. I didn't create these files. These are files that I have
> collected from various sources over the years. If you supply your E-Mail
> address I can send them to you.
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Tedd Dillard" <tedd.dillard@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Tuesday, February 16, 2021 8:43:03 AM
> Subject: Re: [TCML] sync motor
>
> Are there any comments on machining flats on the rotor of an induction
> motor. I understand that has been done with some success. Most of the
> issues I have seen are about the machining.
> Teddy
>
> On Tue, Feb 16, 2021, 8:56 AM Matthew Edwards <matthew.n.edwards@xxxxxxxxx
> >
> wrote:
>
> > I know this was not what you were looking for in regards to an answer but
> > how about winding your own? You would learn a hell of a lot in the
> > process... Who knows, it might spark ideas for future projects :)
> >
> > On Mon, Feb 15, 2021, 9:08 PM Steve White <steve.white1@xxxxxxxxx>
> wrote:
> >
> > > My method was similar but a little riskier. I timed it with the 4
> flying
> > > electrodes in place. I used one of those U-shaped optical
> > > transmitter/receivers that allows the tungsten electrode to pass
> through
> > > it. The clearances are tight.
> > >
> > > Steve White
> > > Cedar Rapids, Iowa
> > >
> > > ----- Original Message -----
> > > From: "shaun" <snoggle@xxxxxxxxxxxxxx>
> > > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > > Sent: Monday, February 15, 2021 12:41:26 PM
> > > Subject: Re: [TCML] sync motor
> > >
> > > I have two holes in the rotor (for 120 bps). On one side of the
> spinning
> > > rotor I point a sk2035a photo transistor through the hole on the rotor
> > and
> > > on the other side the detector. When it spins sends a pulse to the
> scope
> > > which is triggering on line to a old transformer the other channel has
> > the
> > > rotor pulse. Overlap the two channels and align. Works very well and is
> > > fun.
> > > Later on.
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Gary Gaspar
> > > Sent: February 15, 2021 12:49 PM
> > > To: Tesla Coil Mailing List
> > > Subject: Re: [TCML] sync motor
> > >
> > > 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.
> > > >
> > > >
> > > >
> > > > I have purchased from ebay, 2 of the teletype motors and they work
> very
> > > > well, but the ones that are there now, are way too pricey.
> > > >
> > > >
> > > >
> > > > Anyone have any to sell, or a tip on where to get one. I followed Dr
> > > > Resonants leads on motors he talked about, but just another dead
> end. I
> > > > don't really want to machine one up, but I guess that is a option.
> > > >
> > > >
> > > >
> > > > Thanks all.
> > > >
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