On Mon, 26 Jan 2015 12:07:10 -0500
twoten <teslafirma@xxxxxxxxx> wrote:
> I'm trying to find a 120v 1200rpm synchronous motor to spin my 6
> electrode rotating spark gap. I have a 1200 rpm synchronous motor but
> it's 3-phase and 230volts. I have been looking into microcontroller
> solutions and building my own 3-phase motor driver. I have a vfd that
> can spin the motor at the proper rpm but the phase drifts slowly
> around the clock as seen by my homemade 120hz led strobe light..
> Existing vfd's don't have inputs for zero crossing signals and so
> can't be phase locked to the line. If anyone knows where I can find a
> motor or even if they exist please let me know. Thanks in advance!
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I have successfully made a fan motor (6 pole single
phase) sync by milling 6 flats on the rotor. The motor came from an A/C
condensing unit. It did not require much material to be removed.
There are instructions on the web and in the list archives for two pole
and four pole motors. Works the same with six pole, just more flats.
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