vfd means Variable Frequency Drive
It will never be in sync with the line voltage, it will be rotating relative
to the output frequency.
A vfd will take your incoming single-phase line, rectify it and spit it out
as a three-phase stepped sine wave. These have an incredible advantage in
machinery as you get solid torque from very low RPMs up to the rated motor
speed. All other methods of regulating a motor's speed will result in poor
torque performance at low RPMs.
If you want to price check, I really like these people: Automation Direct
http://www.automationdirect.com
Here is their listing for a 1/4 horse vfd. The vfd is $99.
http://www.automationdirect.com/adc/Shopping/Catalog/Drives/GS1_(120_-z-_230
_VAC_V-z-Hz_Control)/GS1_Drive_Units_(120_-z-_230_VAC)/GS1-10P2
Here is their listing for an inverter duty (a must-have) 1/4 horse motor
with 1800 RPM max. The combo will drive at almost full torque down to 1.8
RPM. The motor is $148.
http://www.automationdirect.com/adc/Shopping/Catalog/Motors/AC_Motors_-_Gene
ral_Purpose_and_Inverter_Duty_(0.25_-_300HP)/AC_Motors_-_Inverter_Duty,_Mara
thon_(0.25_-_100HP)/Marathon_MicroMAX_(0.25HP_to_10HP)/Y500
The vfd I pointed to has voltage control of the frequency so you could
remotely dial in the RPMs of your gap.
Dave
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of David Boyle
> Sent: Tuesday, April 22, 2014 10:51
> To: tesla@xxxxxxxxxx
> Subject: [TCML] srsg with a vfd
>
> I have a chance to get a motor and vfd drive for a nice price for my
> srsg. My only concern is would a 3 phase synchronous motor
> powered by a
> variable frequency drive running at 1800rpm be in sync with the line
> voltage?
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