mechanical induction heater attempt - Page 1
Forum section: electronics / rf-microwave

author: coppercone2
author_rank: Super Contributor
timestamp: February 10, 2021, 02:48:24 am
content: Some of you might be wondering what happens when you rotate a magnetic field mechanically, but don't want to waste money on something so crazy, a similar concept to the Alexanderson transmitter.A bit more powerful then a degausser you might have built for a old CRT

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 10, 2021, 04:25:48 am
content: Simpsons, er, Cody did it earlier:https://youtu.be/l8PxXZoHTVUTim

author: Berni
author_rank: Super Contributor
timestamp: February 10, 2021, 06:45:51 am
content: Hacksmith went onto the idea of using the same thing to make a working hoverboard.Since any currents that get induced are opposing and so repel metal objects. It worked but it has taken double digit kW of power. All this power made inductive heating a problem since it produced so much heat that the aluminium plates it rides on started warping all over.

author: coppercone2
author_rank: Super Contributor
timestamp: February 10, 2021, 07:57:34 am
content: Lol, does this stuff interfere with transmitters for LF beacons (nav) and sub communications? Main reason I never spun a magnet around for no reason (save for a small weak one on a spade drill for degaussing a CRT) is fear that I would be making a 'intentional transmitter' and have the navy and or coast guard show up because its interfering with LORAN or Cuttler. Usually spinning magnets have a shield around them or some kind of closed path. Granted I assume that literary every induction stove and induction heater ever does more harm but I am not sure if they just choose frequencies and harmonics that are outside of critical regions, I do feel like there must be tons of more powerful radiators out there that are the norm and all over the place given its a common operating region for power electronics.What I think would possibly be the most possible to interfere with is e-loran since there is much renewed interest in it now, but it does seem to operate at frequencies (90+KHz) well outside of what can be made mechanically without air spindles or more hardcore equipment.. and I guess the VLF submarine transmitters (5-50KHz) are extremely high power so it would be swamped with a reasonably sized magnet?https://en.wikipedia.org/wiki/List_of_VLF-transmitters

author: FenTiger
author_rank: Regular Contributor
timestamp: February 10, 2021, 12:53:59 pm
content: How quickly can you spin a magnet?LORAN works at about 100kHz so to interfere with it you'd have to rotate your magnet at 6 million RPM.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: February 10, 2021, 01:07:56 pm
content: Quote from: coppercone2 on February 10, 2021, 07:57:34 amVery similar to a motor. There will not be any EMI from this.

author: coppercone2
author_rank: Super Contributor
timestamp: February 10, 2021, 01:29:50 pm
content: the motor has a steel shell around it though, this is exposed magnets. Well in these induction heaters they try to contain the field to a smaller area so I guess you are saying the leakage is small regardless because of how its used? Those RF-benchtop induction coils would be the worst candidate I think (bolt remover)i saw a large inductor nail a CRT monitor from like 10 feet away before