I managed to balance the coffee can disc to spin fairly smoothly at around 5,000 rpm but did not achieve the thermal production I wanted at that speed.
I am going to just buy some flat stainless steel discs and build a slightly smaller, lighter, better balanced induction disc that I can take up to at least 10,000 rpm.
I am going to narrow the next disc down to about 4 inches but build a thicker stack of aluminium foil, probably 50 layers or so sandwiched between the steel plates and use a large steel soup can as the enclosure with magnets around the outside of the can, aligned with disc.
That was my intent with this disc but it's just taking too long to grind into balance. A narrower disc will be easier to spin faster with less vibration. I have already ordered the pre-cut steel discs 😁
While using lightweight materials such as aluminium there is a bit more tolerance for an imbalanced disc spinning at high rpm. Stainless steel is much heavier and even a small imbalance at high rpm would cause failure. It's a slow process but worth the effort.
This next model using this new induction disc with 24 layers of aluminium foil between two stainless steel plates should be ready within a couple more days.
Steel? Magnets? In the next video, you will see why that is a good combination 🙂
Update May 3, 2020: I am still working on the new disc. Pure iron would be faster to grind round than this tempered stainless steel. I have more than half the grinding / balancing done now but I am returning to work so it will be a few more days..
In the presence of only a couple small magnets in open air, there is heat being produced at 1,500 rpm. It's a 12,000 rpm motor so... I keep grinding until I get at least 5,000 rpm smoothly 🙂
I wanted to demonstrate a longer run of this design using a radiant aluminium top for 15 minutes. I conducted this test outdoors on my deck at 60 degrees F with a mild breeze and still warmed the air above the heater by 18 degrees F. 20 watts in... 18 degrees warmer air out 🙂
This model uses a 20 watt, 9,000 rpm motor to spin a 6 inch aluminium - graphite composite disc in a magnetic field to produce enough heat to warm 800 cubic feet by 4 degrees F in 17 minutes.
My next model will be more powerful due to a change in the disc materials. With a titanium - graphite composite disc, I will be able to heat my entire house and produce reliable thermoelectric power.
Created 1 month ago.
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