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RE: [TCML] Using unequal electrode spacing's, was Setting optimal phase angle of SRSG motor
Taper lock for easy change and no run-out. The taper locks I am using have a
keyway, as does the motor. This means I must mark the electrode holes
correctly before drilling, as there is no moving the rotor/hub assembly in
relation to the motors shaft as normal practice.
I just put a temporary vane on the SRSG modified rotor and use an infer-red
detector and emitter positioned at the proposed fixed electrode point. Then
try various vane positions on the rotor to find one of the points that
corresponds with the zero crossing point of the mains voltage. Mark the
rotor and I then work from there and any discrepancy is small enough for the
phase controller to take into account. Then I drill the holes!
Sounds much harder and fiddly than it is in practice, I have done one
before, and only takes 5 mins to find the drilling point
Regards
Phil
www.hvtesla.com
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bturner@xxxxxxxx
Sent: 08 December 2010 16:37
To: Tesla Coil Mailing List
Subject: RE: [TCML] Using unequal electrode spacing's, was Setting optimal
phase angle of SRSG motor
Not sure about taper-lock, still a possibility of rotor shift due to
rotational torque. I use a conventional hub with screws to the motor shaft
flat... A stepped flange with 4 threaded holes, the rotor(s) have a mating
bore and bolt holes. The flange provides accurate centering, and four S/S
10-32 cap screws work just fine. A conventional NEMA motor cradle provides
the phase angle adjustment.
> Thanks John,
> I can see what you are saying regarding the efficiency, rather than
> just the design and timing, allowing it to draw more power. An overall
> consequence is that the power factor shows an increase as well.
> Anyway I will still go ahead for next year, as it seems worth pursuing.
> Deciding on the timing to use will be the tricky part, and getting the
> phase correct with your phase controller will be interesting, as you
> will not be able to listen to the change of sound like a recent thread
> discussed.
> Richie mentions the difficulty of changing rotors to compare results,
> so with this in mind I intended to use taper lock type hubs. It should
> be possible then to swop in a couple of minutes in theory at least
> [grin]
>
> Regards
> Phil
>
> www.hvtesla.com
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Futuret
> Sent: 07 December 2010 22:48
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Using unequal electrode spacings, was Setting
> optimal phase angle of SRSG motor
>
> Phil,
>
> I think I had seen that, but I did my own work with unequal gap
> spacings before Richie did his work. In my work I didn't actually
> calculate or simulate the effect, I just used my judgment for the
> spacings, then verified that I was getting equal sized bangs using a
> scope.
> Because I just estimated the proper spacings, my bang sizes were not
> exactly equal in amplitude but were quite close.
>
> Regarding improvement, it depends on how you look at it. Yes the
> system will draw a lot of power and give longer sparks. What's not
> clear to me is that efficiency is increased. In other words does it
> give longer sparks for a given input power? Certainly if a particular
> system tends to draw more power, it will tend to give longer sparks
> also. From what I remember I didn't actually get longer sparks for a
> given input power, compared to a system using equal gap spacings for
> the same input power. I was using a potential transformer to power
> the coil, so I was able to adjust the ballasting as needed.
> I didn't try the system using NST (current limited) transformers.
>
> I can't remember all the details of my tests, so I can't feel too
> confident in what I'm saying. I just reported what I remember.
> I remember thinking at the time that the extra complexity didn't seem
> worth the effort.
>
> It might be a good idea to do your own experiments, and let us know
> what you find.
>
> Cheers,
> John
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Phil Tuck <phil@xxxxxxxxxxx>
> To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx>
> Sent: Tue, Dec 7, 2010 5:29 pm
> Subject: RE: [TCML] Setting optimal phase angle of SRSG motor
>
>
> John,
>
> I presume you have seen this page many times of Richie's
>
> http://www.richieburnett.co.uk/offset.html
>
> I was seriously thinking of trying it for next year, but you have had
> no
>
> improvement your saying?
>
>
>
> Regards
>
> Phil
>
>
>
> www.hvtesla.com
>
>
>
>
>
> -----Original Message-----
>
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf
>
> Of Futuret
>
> Sent: 07 December 2010 20:54
>
> To: tesla@xxxxxxxxxx
>
> Subject: Re: [TCML] Setting optimal phase angle of SRSG motor
>
>
> If I remember correctly, it's not necessary to use unequally spaced
>
> electrodes to get equal bang sizes at 200 bps.
>
> I've done various experiments with unequally spaced electrodes but I
> didn't
>
> generally obtain longer sparks for a given input power.
>
> John
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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