Author Topic: Can crusher attachment  (Read 1199 times)

Offline MRMILSTAR

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Can crusher attachment
« on: August 29, 2019, 06:05:49 AM »
I finished version 2 of my can crusher attachment for my pulsed power generator. It is much more efficient than version 1 because the coil almost touches the can for excellent coupling. The coil is also only about 0.5 inch long which yields a very concentrated magnetic field. Version 2 consists of 3.5 turns of 9 AWG double-build magnet wire wound inside a 0.5 inch thick ring of G10 sandwiched between two pieces of acrylic. The acrylic actually holds the can and prevents the can from touching the wire. This coil can cut a can in half with 1500 joules.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline kamelryttarn

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Re: Can crusher attachment
« Reply #1 on: August 29, 2019, 08:03:50 AM »
WoW! Beautiful workmanship! What kind of capacitor bank do you use?

Offline MRMILSTAR

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Re: Can crusher attachment
« Reply #2 on: August 29, 2019, 03:38:24 PM »
Thanks. It is a single Aerovox Aerostor energy discharge capacitor. The capacitance is 100 uF rated for 22 KV. The capacitor weighs 225 pounds. I have posted a number of pictures of the pulsed power generator on here earlier if you want to see it.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Mads Barnkob

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Re: Can crusher attachment
« Reply #3 on: August 30, 2019, 10:14:43 AM »
Beautiful looking work coil, but also a possible fragmentation grenade if you push the bank at full charge through it. Is that the reason for the connector plates where it is soldered to? To make a weak link that will blow up before shredding the coil into pieces?
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Offline MRMILSTAR

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Re: Can crusher attachment
« Reply #4 on: August 30, 2019, 03:18:40 PM »
I was very aware of the fragmentation possibilities. That is why I used the heaviest gauge magnet wire that I could buy which was 9 AWG. I also limit the energy to a maximum of 1500 joules. This is enough to cut a can in half so its pointless to go any higher. I looked at other can crushers and they used smaller wire and up to 2000 joules without explosion so I felt confident with the 9 AWG wire and a 1500 joule limit. The lead wires are extended down into the blast cage for connection. Since these have no shielding this seemed like a good way to prevent any shrapnel from escaping from the leads if they did happen to explode. I feel pretty good about the coil itself. It is encased in a 0.5 inch thick G10 containment. I got the idea for the G10 containment ring from a Harvard Physics Department can crusher demo. I didn't intentionally limit the size of the solder joint to the connection tabs. That is just the way the solder flowed. I may build an acrylic viewing case to place over the entire mechanism just for an added measure of safety.
« Last Edit: March 02, 2020, 10:32:53 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline MRMILSTAR

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Re: Can crusher attachment
« Reply #5 on: November 25, 2019, 09:23:08 PM »
I thought these might prove interesting. These are oscilloscope screen captures of the time domain response of my can crusher with only a 15 volt charge on the capacitor. The first screen capture shows the response with no can in the work coil. The second screen capture shows the response with a can inserted into the work coil.

Here are the results with no can inserted:

* Resonant frequency = 8.3 kHz
* Total inductance = 3.6 uH
* Total resistance = 0.03 ohms
* Duration of initial 3 cycles = 360 us

Here are the results with a can inserted:

* Resonant frequency = 9.1 kHz
* Total inductance = 3.1 uH
* Total resistance = 0.06 ohms
* Duration of first 3 cycles = 325 us

So the time available for the energy to crush the can is about 350 us.
« Last Edit: November 25, 2019, 09:28:17 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

High Voltage Forum

Re: Can crusher attachment
« Reply #5 on: November 25, 2019, 09:23:08 PM »

 


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