Author Topic: Ring Launcher AC vs DC?  (Read 1452 times)

Offline nsled

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Ring Launcher AC vs DC?
« on: October 05, 2023, 02:04:12 PM »
Why does an AC launch a ring much further than DC? It's demonstrated here but not explained;

/>
I believe that example is just using mains AC/rectified DC. Would a capacitor discharge into the coil result in the AC or DC effect?

Offline dexter

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Re: Ring Launcher AC vs DC?
« Reply #1 on: October 05, 2023, 05:32:52 PM »
Current is induced into the ring only when the magnetic flux changes. In the DC experiment that happens when the switch either closes or opens, so the ring will not move that much. When AC is applied the long iron core the coil and the ring is a induction motor.

A capacitor discharge into the coil result in the DC effect.

Offline FPS

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Re: Ring Launcher AC vs DC?
« Reply #2 on: October 05, 2023, 06:53:22 PM »
I was thinking the DC pulse would resonate with the capacitor in effect operating as an AC pulse.

So why do the flat launchers not use an iron core as well? like this one doesn't.

/>
There's plenty of examples online but every capacitor driven launcher has no iron core, every AC mains one does have an iron core. I guess I'm looking for the reason, if any.

Offline MRMILSTAR

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Re: Ring Launcher AC vs DC?
« Reply #3 on: October 05, 2023, 10:02:46 PM »
I can think of several reasons. The AC induction launcher uses a long solenoid-type coil excited by continuous 60 Hz AC. The iron core serves to concentrate the magnetic flux. The energy applied to the ring is added continuously along the length of the coil. If DC were applied, energy would only be added for the duration of the damped sinusoid response. In this case the damped sinusoid duration and frequency would be determined by the coil inductance and parasitic capacitance of the coil. The duration would be considerably shorter than the length of the coil thus making continuous AC much more effective.

For the case of a disc launcher, the coil is flat and the disc is in almost direct contact with all of the coil. The capacitor discharges all of its energy into the coil within a few microseconds. The waveform shape is that of a damped sinusoid caused by the resonance of the capacitor/coil combination. My launcher has a resonant frequency of about 7500 Hz. At frequencies that high, an iron core is unnecessary and would be very lossy.
« Last Edit: October 06, 2023, 05:02:53 AM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline FPS

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Re: Ring Launcher AC vs DC?
« Reply #4 on: May 19, 2024, 03:55:37 AM »
Which would launch further, just a coil and plate on top, or one with another aluminium plate on the bottom? It's just a meandering thought. I would assume the bottom plate will suck the energy out of the system and result in a lower velocity, but I'll pose the question as I don't really know.

Theory relies on a a few things. 1. That most of the magnetic pulse is lost out the bottom and not used to accelerate the plate, 2. the plate only has a few millimetres to accelerate, and 3. increasing the time the plate is in the magnetic field will have a significant result even if in the order of microseconds.

So placing a plate underneath will make the coil jump with the projected plate and lengthen the time it's under its influence thus resulting in higher velocity.


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Re: Ring Launcher AC vs DC?
« Reply #4 on: May 19, 2024, 03:55:37 AM »

 


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