Pancake Coil Test on 2500 Watt ZVS Induction Heater
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- เผยแพร่เมื่อ 15 ก.ย. 2024
- Recently, I tested a 10 inch diameter single layer work coil (a "Pancake" Coil) on my 1000 Watt ZVS Induction Heater, but today, we will see how it behaves on the 2500 Watt Induction heater. And, there is even a bit of drama when I unintentionally short the work coil leads together --- but I don't ruin anything.
As per Captain Obvious, the heating of any piece of steel or metal depends on its total magnetic hysteresis given whatever alloy it has. If it doesn’t have much of a reactance to the applied alternating field, it won’t heat up much.
You could use the pancake coil on one ZVS to preheat a smoked graphite ingot mould when you are about to pour from a melt on another ZVS. Very little chance of disturbing the carbon coating.
More good stuff - thank you!
Have you considered a "Tesla-wound" pancake coil??
Lucky break there with the coffee can short--I would have sworn that was a MOSFET failure! Does your power supply have overcurrent protection??
OK, I just heard your explanation for the short-circuit save...should've listened to the last few seconds before commenting!
What will happen if you reduce the number of turns in the pancake coil, about 4" OD?
If the OD of the coil was about 4 inches and the ID about 1 inch I think I might get about 6 turns. That would cause the frequency to increase substantially and the power density too. I'm just guessing here, but the frequency may be a bit too high for the Mosfets, maybe not.
@@frenchcreekvalley
Thankyou for your reply.
I really appreciate your prompt response. Maybe I can have the same size coil, but put a bit of a curve to it. Like the shape your hand would make on a 5" diameter pipe. 😊👍
Hi. Nice Work same as usual.
How long to take a piece of metal (say steel) get around 200-300 Celsius.
You can see that the heating is uneven, but the thin tin, (the unrolled coffee can) would get to about 300° C in about 20 seconds. The 16 gauge steel sheet would get to the same temp in about 50 seconds. This heating rate would require that the insulation be in place on both sides of the material, as you see in the video.
Hi, Is Coil Voltage also 48V or more than that?
If Yes, is there difference between 2500W, 1800W and 1000W?
Yes, the voltage across the work coil is a lot higher than that of the power supply.
I just measured the voltage across a 12 turn 2 inch ID work coil on my 1000 watt heater with a multimeter and it is 220 volts rms. I also looked at it with my old Tectronix 422 scope and then remembered why I don't pay much attention to the voltage across the work coil. When I connected the 10X scope probe and turned on the power, I got a 300 volt peak to peak signal (at about 65kHz) that was approximately sinusoidal. But, after about 30 seconds, the scope probe became too hot to touch, the insulation on the ground lead melted, and I almost burned it up. The scope probe circuit's inductance (whatever it was) tried to act as a parallel work coil, but with only tiny conductors!!!
I don't think these readings would change very much for the 1800 watt or 2500 watt heaters, but I have not measured them. I really don't need to do that for my applications.
For what it's worth, the experts say that the voltage across the Mosfets will equal
The power supply input voltage X pi.
@@frenchcreekvalley I want to measure frequency with my multimeter it's up to 250V. I guess can't do with it.
@@mohammadrezasafari102 If your multimeter reads rms AC voltage, it should be okay.
If you live in the USA, check the voltage at a power outlet in your home. If it measures approximately 120 volts, then your meter is reading rms. If this is true (which is quite normal for a multimeter) then you will be able to read the voltage across the work coil.
As always, use caution when measuring voltages this high.
Hi, would this pancake coil heat two sheets of metal if you placed one underneath the coil and one on top please?
@@lukebrown6913 yup.