Re: making a motor synch?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Christoph Bohr by way of Terry Fritz <teslalist-at-qwest-dot-net>" <cb-at-luebke-lands.de>

I went through some similar problems when I tried to get my motor sync. I
found a normal fluorescent hand lamp like the ones you can buy at automotive
supply stores perfectly usable. I painted a 2" pattern on my disk that holds
the electrodes and the phasing can be perfectly seen with other lights in
the room off.

My motor wouldn't get into sync until I changed the run cap from 3µF to7µF.
The motor gets a bit hot that way but thats not a problem with the short
runtimes. By adding capacitance I was able to increase tourque a bit, too.
The SRSG is fed through a variac ( ordinary setup ) and to my surprise I am
able to change phase up to 45 degree by altering the voltage to the Motor,
so no special phase controller has to be used :-)

Maybe some pics and specs of your motor and mods might give me a better
chance to give you some hints what to do.

regards

Christoph


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, June 01, 2003 6:08 PM
Subject: Re: making a motor synch?


 > Original poster: "Mark Broker by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<mbroker-at-thegeekgroup-dot-org>
 >
 > David, the sound you describe is probably the hunting noise made when the
 > motor is NOT syncing properly.  How much material did you remove?  You may
 > need to remove some more.
 >
 > If available, a monitor can be set to a 60Hz refresh rate.  A TV's
vertical
 > scan rate (similar to a monitor's refresh rate) is about 60 Hz
 > (59.something).  It would be hard to see a disc from the light of a
monitor
 > or TV, but your painted lexan disc would work quite well ;)  I once ran my
 > coil out on a street corner in the city (remember that one, Boden? ;) )
and
 > was able to see the elctrodes sweeping out about a 45 degree arc,
 > presumably due to the sodium street lights.
 >
 > Regards,
 >
 > Mark Broker
 > Chief Engineer, The Geek Group
 >
 >
 > On Sat, 31 May 2003 20:38:32 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:
 >
 > >Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 > >
 > >Hi David,
 > >
 > >I am not sure the wa-wa-wa-wa sound is right.  That may be the motor
 > >slipping sync.  The files you seek are at:
 > >
 > >http://hot-streamer-dot-com/TeslaCoils/Misc/syncmot.zip
 > >
 > >You almost need a card the is half black and half white to see the
 > >sync.  Flourescent lights or pretty sluggish so you need a very clear
 > >pattern for it to show up.
 > >
 > >Cheers,
 > >
 > >Terry
 > >
 > >
 > >At 10:24 PM 5/31/2003 -0400, you wrote:
 > >>Hi all,
 > >>
 > >>I decided to try to redo the ASRG of my big coil and try to
 > >>go sync with the motor. I took the motor apart and ground
 > >>2 flats on the rotor (3450 rpm) and then slapped it back to-
 > >>gether. I tried the paint marks on the disc attached to the
 > >>shaft (was one of the original RSG lexan disc). I turned it
 > >>on under flourescent lights of my shop but could not spot
 > >>the white paint marks on the disc. Did hear the motor mak-
 > >>ing a wa-wa-wa-wa sound though. Does this mean that she
 > >>is synching? The motor does seem to have less torque and
 > >>also seems to get pretty warm to the touch with just a few
 > >>minutes of operation like this. I know many have stated
 > >>that it's really hard to get the strobe affect under flourescent
 > >>lights. Also some have stated to just place a temporary
 > >>cardboard disc on the shaft for strobing. Anyway, I was also
 > >>planning on replacing the lexan discs and 3/8" brass allthread
 > >>rotory electrodes w/ G-10 disc and 1/4" tungsten rotory elec-
 > >>trodes. I will probably have to have the G-10 disc cut out by
 > >>someone with good machining facilities as I certainly don't
 > >>have that myself.
 >
 > <snip>
 >
 >
 >
 >
 >