Re: [TCML] Alternative RSG Motor and shielding

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I have done so, and managed to kill 2 VFDs. I finally found evidence that my electrodes were arcing to the motor base, so that's easy to fix.

Like you, I have a question on the best way to not kill my last remaining VFD. I've read about protecting the three phases, but don't have the specs handy.

I'm currently only running three wires to the motor, and letting the motor housing float.




________________________________
 From: Greg Peters <greg.j.peters@xxxxxxxxx>
To: tesla@xxxxxxxxxx 
Sent: Wednesday, August 28, 2013 11:31 PM
Subject: [TCML] Alternative RSG Motor and shielding
 

Hi All,

I am in the process of building an ARSG for my new DC coil. I have already
had an FR4 12" disc CNC machined and will be using 10mm flying electrodes.
It's looking good!

I was originally going to use a DC or universal motor but was able to
obtain a 1HP 3-Phase motor with a single phase to 3 phase inverter for less
than half the price.

Essentially the inverter allows me to run the 3 phase motor from a single
phase with variable speed control from 0 to 6000RPM. It works very nicely.

Anyway, I suddenly have concerns that I might have trouble getting this
arrangement to work in the vicinity of the TC due to RFI.

I was thinking that if I run the inverter in a shielded box, ground the
motor housing, use shielded cable to the motor and an EMI filter on the
inverter supply then I should be OK. Does anyone have any thoughts on this,
before I go spending money on getting a coupling machined to mate the disc
to the motor? If it's a lost cause I will just find a new type of motor,
but I think I should be able to get it to work.

If it does work, it's actually a very nice setup. The motor is industrial
with a cast housing, big bearings, solid mounting and a thick 19mm shaft
with keyway. The inverter allows full speed control and even reversing with
the twist of a knob!

Anyone tried using such a motor and inverter setup?

Advice is appreciated!

Greg.
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