Old 01-16-2015, 08:00 AM #1
Marco Polo's Avatar
Class 2M Laser
 
Join Date: Nov 2012
Location: Ohio, USA
Posts: 614
Rep Power: 5432
Marco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond repute
Marco Polo Marco Polo is offline
Class 2M Laser
Marco Polo's Avatar
 
Join Date: Nov 2012
Location: Ohio, USA
Posts: 614
Rep Power: 5432
Marco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond repute
Default Running a 240V/50Hz MOT on 120V/60Hz

Forgive me for posting another one of these. I keep googling for this, but there are a lot of "build a 240V power supply" links and that isn't what I'm going for.

I'm thinking that one way of avoiding MOT core saturation would be to get a 240V/50Hz unit and run it on 120V/60Hz. Unless I'm mistaken, this would result in lower magnetic flux through the core due to twice as many turns/volt on the primary, and also due to the higher line frequency. The output voltage would also be halved, although I'm sure it would still be deadly.

The idea is that by doing this, the idle/magnetizing current would be lower. I think MOT idle current is normally 5 to 10 amps, which is wasteful and will ultimately overheat the unit.

Another thought is that if I rewind the secondary for low volts / high amps, more turns on the primary means more amps at the secondary for a given number of secondary turns.

Is any of this correct or am I way off in left field?


__________________

808nm : SkyLaser HL808 820mW
650nm : [C6] LPC-826 215mW - SkyLaser HL650 175mW - Radio Shack <5mW
638nm : Opnext HL63603TG 190mW - AtlasNova <5mW
632nm : Metrologic ML-868 <5mW - Uniphase 155ASL-1 HeNe 0.95mW
543nm : Melles-Griot 05-LGR-193-497 HeNe 2.4mW
532nm : SkyLaser HL532 w/ IR filter 200mW - Fasttech SD-301 120mW - Lazerer LZCS 105mW - Laser 301 custom mod 85mW - various Laser 301's
520nm : [C6] Osram PL520 110mW - SkyLaser HL520 50mW
450nm : [C6] Osram PL450 260mW - Lazerer LZCS 145mW - SkyLaser HL450 95mW - SkyLaser LP450 90mW
405nm : Laser 303 85mW - Laser 301 90mW

Radiant X4 LPM from Illumination Supply


CHEAP BATTERIES CAN KILL YOU - please read this thread to see the truth about UltraFire and other CRAP brands!
Marco Polo is offline   Reply With Quote


















Old 01-16-2015, 05:29 PM #2
upaa27's Avatar
Class 2M Laser
 
Join Date: Jul 2013
Location: San Francisco
Posts: 624
Rep Power: 191
upaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond repute
upaa27 upaa27 is offline
Class 2M Laser
upaa27's Avatar
 
Join Date: Jul 2013
Location: San Francisco
Posts: 624
Rep Power: 191
upaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond repute
Default Re: Running a 240V/50Hz MOT on 120V/60Hz

To help with the mot's leakage inductance and saturation issues a good amount would be to wind at least 20 extra turns on the primary. This would allow you to remove those shunts. I heard it brings the magnetizing current to under 500 ma for adding 30 extra turns.

This will also increase your current output on the secondary and decrease voltage there as you said.

Last edited by upaa27; 01-16-2015 at 05:36 PM.
upaa27 is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 06:11 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC