Hello everyone! I started this morning out with a beautiful walk along the gulf coast for the American Heart Association. I wanted to share two things with you today, a couple photos from the event and one more thing (keep reading).
Generosity Begets Generosity
All the giving got me thinking, after all, you know what they say about giving. Generosity Begets Generosity. Generosity is a gift that keeps on giving—so many of the gifts we receive in life turn us into givers.
I wanted to show my appreciation to the Patrons who continue to believe in this project even when life slows its progress way more than I’d like! I was reminded today that I actually did not start this project for myself. I am not a blacksmith, I have no immediate need for an induction heater, but I am a creator. Each and every human has this incredible capacity to imagine and to change things. I wanted to bring a tool within the reach of others that remained out of reach for most. Not a wimpy, “doesn’t deliver on what the box said kind of tool”, but one of a caliber that is not matched in the consumer market at all today.
The Heart of an Induction Heater
I would like to offer the “heart of an induction heater” to all of my existing Patrons (as of today September 22, 2018).
E/I Core from two U/I cores
At about twice the size of a human heart and just about as difficult to source, the matching transformer is by far the most critical, specialized component of the induction heater. Coolant flows around its core in two directions keeping it cool as huge amounts of energy flow through it, making it possible to pump power from your wall outlet into your workpiece. Without it, the IH is just an inverter with some other not really all that exciting electronics. It would be akin to a truck without a transmission. You can’t just connect the crankshaft to the wheels and expect anything good!
I’m including two massive U & I core sets. The same ones that make up the large E/I matching transformer in the newest revision.
Single U-I core set AL: ~8400
Single U-I core set µe: ~2000
Single U-Core Dimensions: 93mm x 76mm x 30mm thick
Single I-Core Dimensions: 93mm x 28mm x 30mm thick
Overall Dimensions: U-I Set: 104mm x 93mm
Opening Dimensions: 47mm x 36mm
3C85 Material Technical Data:
Optimal frequency: < 200kHz
Permeability ui: 2000 +/- 20%
Induction at 100kHz, 250 A/m, Bs: > 400mT
But Wait There’s More
Since driving your IGBT properly is a big deal and kind of important for the whole setup, I’m also including a new driver PCB with two Powerex VLA504-01 Hybrid IC Gate Drivers and two Powerex VLA106-15242 DC to DC Converters. Just those four components are about a $70 value alone if you buy them from Digi-Key. The remaining components on the board are just a few dollars worth of passives. an entire Hybrid Driver kit! The full schematics and bill of materials for the Hybrid Driver board can be found here:
1 x New Hybrid Driver Kit including all parts in the BOM above and a PCB
That is a $106.85 value. Thank you for your support!
If you would like to purchase an additional driver kit or U/I core set I’ve included info on that in the FAQs below.
Send Me Free Stuff!
If you are currently a Patron as of the date of this post and would like me to send you this thank you gift, just drop me a private message on Patron saying hello and include your shipping address. The only thing I would ask is that you only request this gift if you are going to use it. We’ll go on the honor system here. 🙂
I look forward to working on this project more and hearing your feedback as well, as you either work on your own or use an IH I’ve built for you in the future.
Q: Is it possible to drive a tank circuit in an Induction Heater with one IGBT?
A: Yes. This is actually how my brothers old IH is set up now. Here is a quick schematic. The capacitors were all off eBay for cheap.
Q: Can you share more details on the matching transformer?
A: Of course but I need some more space to do it properly. I’m working on a post about just that. In the meantime here is a photo and a short explanation to give you something to start with.
The Matching transformer is wound with 1/4″OD inch copper tubing.
All windings are wrapped in x2 overlapping Scotch Professional Grade Vinyl Electrical Tape Super 88. Meaning as you spiral down the length of the copper tube the electrical tape covers 50% of the layer before it resulting in a 50%+50% overlap (no gaps) and a 200% layer thickness overall (better electrical and mechanical isolation).
The primary winding (connected to the inverter) is composed of 13-14 turns. It has terminals made of copper soldered near the ends to accommodate a high current connection while leaving the ends of the tube free to hook up to the cooling system.
The secondary winding (connected to the tank cap and work coil) is a single turn composed of 4 individual 1/4″ copper tubes connected on each end with a 1/2″ manifold. One side of the manifold connects to one side of the tank capacitor, the other connects to one side of the work coil via a copper plate. The other side of the work coil connects back to the other side of the tank capacitor via another copper plate in close proximity to the first plate. This whole set up ensure the flux is fully enclosed in the system. Were it not you would heat up surrounding metal and loose usable power. (An issue in the first model with the toroidal matching transformer and large tank setup.)
Q: If I’m not currently a Patron or I would like an additional hybrid driver kit could I just purchase one?
A: Yes. I’m not set up to do this formally yet but I can accept Paypal, just drop me a message. For this small batch I made, I’m selling them for $54.95 flat (free shipping to the 48 states, at cost everywhere else). That’s half the cost of buying all the parts yourself or a similar evaluation board (the BG2B). I’ll be able to get this even lower in the future on larger orders for inclusion in the full IH kit. Done! –> I’m also still working on a bulk order for the passives to get the entire driver kit complete. The price difference with and without the passives will likely be less than a couple bucks, keep that in mind if ordering those parts would be an issue for you.
Here is the full excel pricing sheet with individual component pricing info from Digi-Key current as the date of this post.
Q: If I’m not currently a Patron or I would like an additional set of ferrite U/I cores could I just purchase one?
A: Yes. These are quite heavy and require careful packing since they are a fragile ceramic. I’m selling them for $25.95 a set (1 x U core and 1 x I core) flat (free shipping to the 48 states, at cost everywhere else).
Q: What shipping method are you using for the free shipping option?
A: Whichever is the lowest cost at the time of shipping to your location. Usually either USPS first class, priority, or FedEx ground. If you would like to choose a specific method I can do that and just pass on the exact cost to you, no markup.
Q: What about the other parts of the system like the main board, AC rectification & filtering, liquid cooling setup, etc. Can I get one of those?
A: Although I do have fairly complete designs worked out on the rest of the system I don’t have a stock on the parts. I am going to start making posts on the individual components starting with the matching transformer to give you what you need to duplicate each part. The main board schematic and board design are on GitHub although I will be making some changes to it on the next go around.
It’s been a busy couple of weeks, both with my day job and working with suppliers to get the best price and quality on parts for the hybrid driver but I do have a driver kit update. I have finalized the supply chain and received all but the passive components and packaging materials. I expect everything to be here by the end of January. Once I have all the parts I’ll take the photographs for the plans, which will be available for free.
I also want to make a test rig for the hybrid driver ICs and the isolated DC to DC converters. They are critical components and cost a decent amount. I want to know that they are performing as expected before they go out in the kits or machines. I have a couple of ideas for building a simple but detailed and accurate Arduino based performance curve profiler similar to those used for testing transistors, diodes, and other electronic components. In the meantime, I’m getting back into the code using the two new driver boards I build from the spare components.
$400 AA Battery Accident
I dropped a harmless little AA on my desk while changing the batteries in my mouse. The battery bounced and rolled away, I didn’t think much about it. A few minutes later I noticed my screen took a hit… awesome. The outer glass isn’t even cracked. It was one of the substrate layers that broke and let out all the magic liquid crystals. Looking around for a replacement LCD for my MacBook Pro Retina, 15-inch, Mid 2014 it seems like $300-$390 is the price range, ouch! I saw some cheaper off brands but this is a beautiful Retina display, and I don’t want to change it out for some knockoff junk LCD.
I have been looking at the new MacBook Pros, but I genuinely don’t like them. The taskbar is a POS gimmick, and the keyboard feels like a toy. I switched to using MacBooks around 2009 when I got fed up with Windows interfering with my work. An [NTFS file system error] blue screen of death the night of a large network activation for AT&T Lightspeed/U-verse was the last straw. I went out and bought my first Mac the next day.
Yes, Mac hardware is costly, but it JUST WORKS! It is always something with Windows. I was tired losing valuable time fixing issues, updating, reinstalling, etc. The MacBooks I have used have ALWAYS worked rock solid. I run CleanMyMac to keep things tidy and a Time Machine at home which is the most intuitive and real world usable backup system ever, for a personal computer at least.
I didn’t mean for this to be a MacBook fanboy review or a windows roasting session, I still use windows too. Personal my favorite OS is Debian, maybe I’ll get a Linux computer. Probably not though, I just run VMware when I need it locally. Besides, I do love the integration between all my devices that Apple affords i.e., desktop, laptop, tablet, phone, TV, etc… It’s just that this is the first physical problem I’ve ever had with a Mac and honestly I’m sort of surprised how easy it broke considering how rough I’ve been on them over the years.
I’m going to order a screen today. I just tell myself, “Don’t worry, you can sell this Mac for about a grand when you upgrade!” Still, what a disappointing accident.
I’ve been working on getting the Development Environment setup and coding over the last week. Doing things setting up the new file structure and weeding out coding errors with the old libraries. I’m about to fire up the ReactorForge and flash over the old code with the new! Then I will start moving the old chunks of commented code out of main.c and get the induction heater up and running with ReactorGraph to begin optimization and clean up of the working code.
Coding is Important but so is Hardware
Also in the photo is a seven wire DIN connection I’m considering. For simplicity, I initially chose a standard power barrel connector like this one from DigiKey, to connect the foot pedal. On the final model, I want one port to cover all the possible accessories, not just the foot pedal. One I’m most excited about is a DIY optical pyrometer to measure the temperature of your near molten chunks of metal. But that’s for after we tackle CriticalMass.
BTW, Audible Rocks!
On my way back from the break I listened to this book and wanted to share it. If you ACTUALLY WANT to work smarter, not harder doing things like coding for example, then I highly recommended you read or listen to this book. It is packed full of insight and detailed information on how to use your brain to it’s fullest capacity.
That link above is using my affiliate link. Audible is a great way to support the creators you enjoy following, and you get two free books! I signed up under Destin over at Smarter Every Day and never looked back! I love listening to a new book on every long drive I make or when I’m doing something that doesn’t require my full attention. I especially like the speed feature. I find 1.5x to be the perfect speed to absorb information at a pace that doesn’t leave me tapping my foot saying ok ok get on with it. 🙂
If you love using Amazon as much as I do, or just use it every once and a while, consider changing your Amazon shortcut to use my affiliate link. https://www.amazon.com/?tag=reactorforge-20 When you do this, everything works the same as usual on your end, and a small portion of everything you do on Amazon goes to help support this project! Awesome and Thank You! 😀
TLDR; The short version is, Patreon moved its credit card processing service fees from the creator to the patron. Because of this change, Patreon was able to lower the overall fee amount and give more to the creator. The fee amount is (2.9% + $0.35) for each monthly pledge.
Because I have worked on unique e-commerce projects, I understand the intricacies and complications of bulk credit card processing, multiple payees, and the associated charges and chargeback liabilities. However, I do not support Patreon’s decision, and I firmly believe there is a better solution. Because Patreon is a goodwill engine, I think this move is, for lack of better terms, just weird. In addition, I won’t personally be canceling any of my Patreon pledges. Nevertheless, as a patron myself and now a fledgling creator, I do hope that we see these processing fees moved back to the creator.
Other Support Options
Your support is much appreciated, but entirely voluntary. You may continue to make a small donation to support the project and website using Patreon. If you decide to cancel out of principal, I understand entirely. If you prefer I’ve added a PayPal button on the pledge page “Coffee” to enable you to make a small reoccurring monthly pledge that you can change or cancel it at any time.
Or you can send a one-time pledge. Please include a note to let me know it’s a gift and what made you decide to support ReactorForge!
I may add members only functionality to the website linked to Patreon PayPal as well, to mirror and even enhance the capabilities Patreon offers. But I’m not sure there is indeed a need for that yet, or possibly ever. Thank you all again for your support, be it monetary, intellectual, or constructive criticism. I value all of it!
ReactorForge Parts Delivery
I just received the first shipment of parts for building more ReactorForge induction heaters, 258 pounds worth. This component is of one particular importance and one I have settled on despite other possible changes I will be making to the design. Anyone care to take a guess what part this is?
Don’t silence humanities most successful form of communication!
Despite what country you live in the topic of Net Neutrality once again affects you. I will get back to updates and work on the ReactorForge Induction Heater tonight, but this is a pressing issue, and we should all be very concerned. More so than concerned we should be active and involved. Voicing your opinion requires only minimal effort. If you don’t have an opinion or have never even heard of the issue, don’t just repeat someone else’s. A quick google search of “Net Neutrality 2017” will help explain the problem. Yes, do include 2017, because this happened already, back in 2015. The following paragraph is my synopsis and view on the matter.
Net Neutrality 2017
I rarely voice my opinion publicly on political matters but hear me out. Our policymakers disgust me. Despite the fact that both parties support net neutrality, they yet again go against our voice. The internet is by far, the most successful form of communication humans have ever invented. We can not give away control of that medium to entities who would redefine it for their financial gain. ISPs or any corporate entity for that matter SHOULD NOT be in control of Internet services. Internet traffic should be treated equally – email, files, web content, can’t be blocked, slowed or discarded by ISPs. I hope our state reps continue to back us up. Call, Facebook, Twitter, and or snail mail your rep! https://www.house.gov/representatives/find-your-representative