>>" The motor is a 3 phase 208v 1/2 horse driven by a vfd. Does it make
sense to grind flats on it's armature?"
DON'T try grinding a three phase motor, AFAIK that only works on single
phase units
Regards
Phil Tuck
www.hvtesla.com
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Dave Boyle
Sent: 18 September 2014 02:38
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Resin or fiberglass perfboard for terry filter?
The motor is a 3 phase 208v 1/2 horse driven by a vfd. Does it make
sense to grind flats on it's armature?
On 09/17/2014 08:50 PM, David Speck wrote:
> Dave,
>
> "Pretty close" is not good enough. When your gap drifts far enough
> away from optimum synchronization, the NST will fail permanently.
>
> Look at the old posts that describe how to file flats on a motor
> armature to convert it to a fully synchronous motor. Then, you can
> use a Freau phase adjuster to precisely set the phase angle of the
> motor without having to mechanically rotate the motor body.
>
> (Another) Dave
>
> On 9/17/2014 7:12 PM, Dave Boyle wrote:
>> Oh now you tell me! Hey what about if I operate my spark gap motor in
>> the synchronous zone? At 1 or 2 beats per cycle with the nst switched
>> off while the motor changes speeds? I have an led strobe synced to
>> the ac line light that I use to see when the disc is at the right
>> position. I can't get a phase lock but I can keep it pretty close.
>> Maybe I should build a custom inverter that will run the motor at
>> only those speeds that are safe.
>
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