Induction Heater

WDG

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Does anyone have a real good way to make a cheap induction bearing heater? I've been on youtube and have watched a few but I wasn't real fond of what they put together. Usually talking over my head in electronics. Although and E&I tech I'm not a component man so making a choke and other things isn't what I want. I think the transformer from a microwave is the best what I would like to know is if anyone has first hand knowledge?
 
i wish i knew something about them , i too would like to learn about induction heaters.
i have seen them and used them, but i'm not exactly sure how they work.
i'm envisioning that you are short circuiting a heavy transformer's secondary circuit with a semi resistant metal that the bearing is supported on.
the resistance creates heat that warms the bar and bearing.
the input voltage, the transformer VA rating, the secondary voltage and the warming bar's resistance will dictate the potential of heat induction capabilities.
if you could vary the output, that'd be sweet! :grin big:
 
The object being warmed is the secondary, and the eddy currents developed in it amount to a direct short, thus warming up said object. That's why they only work on conductive materials, with ferrous being the foremost.

Of course, there's more to it than that oversimplified statement, and it is interesting how they work. Totally practical for the home shop. Interesting build project.
 
How about a worktop induction hob from the charity shop, I'd expect it to work well as it does the same job on pots and pans?

Dave H. (the other one)
 
I have not used one, but did see some on ebay after a discussion here.
Someone was asking about one for localized heating for rusted bolt/nut removal.

http://www.ebay.ca/itm/1000W-ZVS-Lo...805772?hash=item1c683b5f4c:g:aiwAAOSw5cNYmTqI

http://www.ebay.ca/itm/20A-ZVS-Indu...936570?hash=item41c7ade4fa:g:SscAAOSwjKFZO7J2

(I have no interest in those sellers, just grabbed two random vendors!)
The pictures on those two look really interesting.

I'd like to hear some first hand experience if anyone has tried one.

-brino
 
I've been using a coffee mug warmer to get my bearings to fit over shafts. Works pretty good, I need gloves to pick them up. Of course we are talking bearings smaller than a coffee mug.. Not huge honkers.
 
Does anyone have a real good way to make a cheap induction bearing heater? I've been on youtube and have watched a few but I wasn't real fond of what they put together. Usually talking over my head in electronics. Although and E&I tech I'm not a component man so making a choke and other things isn't what I want. I think the transformer from a microwave is the best what I would like to know is if anyone has first hand knowledge?
This is a thing of beauty, carry on.
 
Here's a link about making one.

Bill -Thanks for that link!
What a simple circuit, low parts count, and very tweak-able.....and even gives a spice circuit simulation file.

Another project added to the list!
-brino
 
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