" 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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