1800 Watt to 2500 Watt ZVS Induction Heater Transition Planning

[@bucketlistbeginner]

I love the series on the induction heater. What would you say is the best size to anneal brass cartridges? Up to say a .308 casing. Am I right that the coils size dictates your frequency? Is 50hrtz better then say 10krtz for brass?? Thanks for the great ahows

[@frenchcreekvalley]

You don't get to choose the frequency with these induction heaters, except by changing work coil design. But, in general, I think 50 kHz would be better than 10 kHz The 1000 watt unit seems to work well for what you want to do.. See: kzbin.info/www/bejne/nWeqd4Cmj7qNbc0

[@bucketlistbeginner]

@@frenchcreekvalley thanks for your time, I’m retired and am going to start reloading again, if I can get supplies. Thanks for the help, the coil was what I was thinking about for frequency and will head down that road. I’ll give that 1k unit a try, have a nice xmas

[@Rotorholics]

Hi, great Video! How did you insulate the coils?

[@frenchcreekvalley]

Insulation for ZVS Induction Heater Coils June 25, 2020 I think I usually order the 6mm diameter size, which fits snugly on 1/4" OD copper tubing. I did order 8mm once and it works okay since it is looser on the tubing. Ebay Desc: Φ1~40mm White 600°C HIGH TEMP Fiberglass Sleeving Wire Cable Insulating Tube Ebay Listing: www.ebay.com/itm/%CE%A61-40mm-White-600-C-HIGH-TEMP-Fiberglass-Sleeving-Wire-Cable-Insulating-Tube/153050276433?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

[@Rotorholics]

@@frenchcreekvalley thanks a lot sir!

[@umairali-rm4si]

Hello sir how are you hope your fine well I need to ask one thing about the zvs 1800 watt induction heater I need to add a frequency controller to modify my induction heater do you have any way to add it on because there is an issue like when I melt copper in a carbon crucible it melts but suddenly after melting the ampere goes low and temperature decreases. Thing isn't what I want I need to add a frequency of a duty cycle in the gates of mosphet to control I'm using a 50 volt 48 amps switching power supply please let me know about this how to modify it, Thank you for your videos they are really help full

[@frenchcreekvalley]

I have seen the effect that you mention. I believe that the molten copper "shorts out" the carbon crucible reducing the electrical "friction" of the system. I do not have a good answer for your question, but I offer these thoughts: - You say that you need to add a "frequency controller". For these ZVS heaters, I don't know of any good way to control the frequency of oscillation other than to change work coil characteristics or changing the tank capacitance. The easiest way to change frequency would be to switch in more capacitors to reduce the frequency or to switch out some of the existing capacitors to increase frequency. But, unless you know that a certain frequency will solve the problem, you will have to do a lot of experimenting. I don't think it will help you very much. -If you could add a very thin layer of ceramic material to the INSIDE of the crucible, I think you would solve the problem, although I have not tried it myself. -I assume that you are using a graphite crucible inside a ceramic shell. If this is not the case, then get one. -Add insulation: Adding more and thicker insulation around the crucible, top and bottom, will reduce heat loss considerably. -If the fans are blowing any air at all onto the work coil, you will be taking heat away from the work. Place a baffle between the front fan and the work coil. -The crucible "wears out" with use. The graphite wall gets thinner with use and the current becomes less and less. Try a new crucible. I am sorry that I do not have a direct answer to your question. I hope some of these thoughts help. Pete Stanaitis ----------------------

[@Иван-р5н9н]

Please tell me, how you manage the power input of heating? I dont see any regulator. I need to heat steel up to fixed temperature and stand on it.

[@frenchcreekvalley]

I do not have any "regulator" on my induction heaters. I have seen one or two youtube videos where they use a heavy-duty relay to cycle the DC power (not the AC power to the power supply) on and off to control the average power. Of course, then you can use a PIC temperature controller like this one: www.wolfautomation.com/timer-temp-controller-1-relay-pulse-out-48x48mm-1/ to supply the on-off signal to the heavy duty relay. I also believe that there are DC rated solid state relays that could handle the load, but I have not tried one.

[@jpjay1584]

what Amperage mostfets are safe to use (reliable?) 50A, or even a 100A IGBT?? then also what capacitor voltage is ok? (also to be reliable) 1000V, 0,47uF 10 pcs. total 4,7uF is that ok to operate safely without blowing up? or over rated?

[@frenchcreekvalley]

Hello JP jay. Look up the datasheet for the Infineon IRFP260N Mosfet. I think you will find it acceptable for your application. The 1000 volt capacitors seem about right. I repeat my comment to the recent similar question you asked on another one of my videos: The ZVS induction heaters that I use all use !RFP260N Mosfets. They work well with a 48 volt DC power supply. I water cool my work coil and fan cool the Mosfets and the capacitors. The 1000 watt model in this video uses two of those Mosfets. The 1800 watt model uses two PAIRS of the same Mosfet and the 2500 watt model uses three Pairs of them. I have not experimented with other Mosfets or with IGBT's so I can't comment on their use. In my experience, more capacitance equals more idle current and more heat in the capacitors that needs to be dissipated.

[@jpjay1584]

@@frenchcreekvalley thanks a lot. that sounds fantastic.