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Thanks Ted, yet another thing I forgot to mention. The MOTs have their bottoms removed (open ended cores), so saturation should be pretty much impossible. Tonight I might try and pull three of them out of the oil and disconnect the cores. I'm dreading trying to sand the insulation off the HV wire though. Sent from my mobile. -------- Original message -------- From: Tesla <tesla@xxxxxxxxxxxxxxx> Date:02/12/2013 4:59 AM (GMT+10:00) To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> Subject: Re: [TCML] 3 phase mot dc coil first light Well Greg looks really good. The machine will be interesting when configured for full power. I was not too sure if you gapped your ring up inductors or not but I believe it is quite important if they will be running more than about 300mA . The cores saturate quite easily and gapping made a big difference. In some less than well documented experiments I set up a MOT to measure the actual inductance as the DC component in the secondary was increased against various gapping from zero gap thru to about 0.5mm which is why I am sure gapping is the way to go and to array them up to get the inductance required. Thanks for the post Regards ted in NZ -------------------------------------------------------------------------------- -----Original Message----- From: Greg Peters Sent: Monday, December 02, 2013 3:16 AM To: Tesla Coil Mailing List Subject: [TCML] 3 phase mot dc coil first light At low power, low coupling and limited tuning.... few gremlins to iron out though: Http://www.gregsstuff.co Apologies for the terrible video commentary. _______________________________________________ _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla