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Thanks for the response guys :). Ya I know safety is first . the image which I mentioned here is just for the working principal of magnetizer. Dear sir 2spoons I want to make this magnetizer to make a neodymium magnet of 8inch dia * 3 inches height disk . My question is does my input power of 4kv 75m amps from 2 MOTs is sufficient to charge capacitor bang to get 18000 j energy ??
Registered Member #42796
Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195
rajheman wrote ...
My question is does my input power of 4kv 75m amps from 2 MOTs is sufficient to charge capacitor bang to get 18000 j energy ??
what do you mean by sufficient? a better question is in how much time do you want the cap bank to be charged? and from that a charging current can be calculated
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Ok, you got me hooked (damn you!). I had a quick play with femm - if you surround your "magnet" with a steel mag head ( ie no air gaps) and put the coil around the periphery of the "magnet" I get a figure of roughly 200000 A.T to generate the 30kOe field needed. Thats about 15000J in the coil. The coil was modelled as single turn of solid copper 0.5 inches thick and 3 inches high, with an ID of 9 inches. It ends up dissipating 500kW. The real coil will need multiple turns to drop the current to something feasible, and slow the pulse down to allow field penetration of such a large piece of neo.
So... scary, but doable, though I have no idea how you plan on separating your finished magnet from your magnetising head.
hi guys after a long time ...i got free time to work on this magnetizer, toady i got two mots from local electronic shop cost 19$ each .. on googling i got same piratical project on 24k joule capacitor bank discharge using open-air thyratron system by cevyn his work is well matching to my work to make my magnetizer . but i have one doubt in charging system.how to monitor the power while charging the capacitor bank . because the out put from two mots is above 4KV ..my multi meter reads only upto 600 volts . i want to monitor power while charging the capacitor bank ..any ideas please help
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
rajheman wrote ... ...how to monitor the power ... because the output from two mots is above 4KV ..my multi meter reads only upto 600 volts ... any ideas please help
It's alarming that you are working with lethal electricity before you understand how voltmeter scales are determined.
STFI and read about how voltmeters work. Learn how you can make one for any desired full-scale reading, or adapt yours to read higher voltages. For a topic so basic and universal, "search the Internet" does not mean "ask on a forum". Unless you want to demonstrate laziness on top of ignorance.
Please come back after you have measured the AC output voltage of a MOT and lived to tell about it.
Registered Member #2906
Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
hmmmh. klugesmith.. i was more concerned about the fact that he wants to measure "power" while charging the capacitor bank with a "volt"-meter... but your rant also delivers the right message thx for doing the job, i didnt want to be the negative guy again.. i guess i fear to become known for that. hmmmmmmh
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Magnetizer
