Re: [TCML] speeding up sync motors ?

["huil888" <huil888@xxxxxxxxxxxx>]

James -

Vee belts always run with a small percentage of "slip", no matter how 
tightly the tension is set.

You need to use a toothed timing belt, which will maintain the angular 
relationship between driving and driven shafts. See McMaster-Carr or PIC 
Design for a wide variety of timing belts and pulleys. For a light-duty 
application like driving an RSG disk, the acetal pulleys will work fine. 
Depending on the size & mass of your RSG disk and your motor HP, you might 
be able to use a relatively inexpensive 1/2" belt width.

Regards,
Scott Hanson


----- Original Message ----- 
From: "James Zimmerschied" <zimtesla@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Saturday, November 24, 2007 7:58 PM
Subject: Re: [TCML] speeding up sync motors ?


Tesla List,
I would like to hear if anyone has succeeded in driving a synchronous gap 
with a belt drive. I have been cobbling together such a project but found 
that the belt slippage negates the synchronous aspect of the design. I am 
looking for some cog belts that might do the trick.

Any thoughts or experiences would be welcome.
Jim Zimmerschied
 ----- Original Message ----- 
 From: S&JY<mailto:youngs@xxxxxxxxx>
 To: 'Tesla Coil Mailing List'<mailto:tesla@xxxxxxxxxx>
 Sent: Thursday, November 22, 2007 3:53 PM
 Subject: RE: [TCML] speeding up sync motors ?


 Chris,

 A few have reported they run their SRSGs with variable frequency drives.
 But with most electric motors, the range of RPM that can be achieved 
without
 losing sync or overheating the motor is limited.  You might get a 60 Hz
 motor to work reliably at 40 to 90 Hz, but not 400 Hz.

 You could experiment with a variable frequency sine wave oscillator 
driving
 a hefty audio amplifier (capable of several hundred watts rms) driving a
 beefy 6 volt filament transformer run backwards to step up the voltage to
 120, and drive a small motor, e.g. 1/4 or 1/3 Hp.

 But why not do as Dr. Resonance suggests and belt drive your RSG to step 
up
 or down the RPM by varying the pulley sizes?

 --Steve Y.

 -----Original Message-----
 From: tesla-bounces@xxxxxxxxxx<mailto:tesla-bounces@xxxxxxxxxx> 
[mailto:tesla-bounces@xxxxxxxxxx] On Behalf
 Of Chris Swinson
 Sent: Thursday, November 22, 2007 11:59 AM
 To: Tesla Coil Mailing List
 Subject: [TCML] speeding up sync motors ?

 Hi all,

 Wonder if anyone has tried to speed up sync motors by using a higher
 frequency (maybe 200 or 400hz)...  Options for this are either a 400hz
 generator, or hack a regular DC to AC inverter to run at 400hz.... Just
 pondering really!

 Cheers,
 Chris

 _______________________________________________
 Tesla mailing list
 Tesla@xxxxxxxxxxxxxx<mailto:Tesla@xxxxxxxxxxxxxx>
 http://www.pupman.com/mailman/listinfo/tesla<http://www.pupman.com/mailman/listinfo/tesla>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla