Re: [TCML] Alternative RSG Motor and shielding

[Mark X2 <susax2@xxxxxxxxx>]

Hi Greg,
a fellow Dutch coiler succesfully runs his 3 phase spark gap motor on a VFD
and filter.
http://www.youtube.com/watch?v=Bix2y8DpJGI&;

A shielded cable is probably a good idea within a coil's strike distance.
Just keep in mind that the shield should be single side connected to the
motor's housing plus RF-ground only.

Mark



2013/8/29 Greg Peters <greg.j.peters@xxxxxxxxx>

> 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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