linear actuator, buttkicker, etc...

ßart West-VL. · 2nd June 2012, 11:15 AM

I'm planning on trying to build a good seat-shaker for a friend, just to experiment.
I have strong magnets and a coil with a core.
So I need a good suspension to get the coil and core centered between magnets.
How can I build a good suspension that doesn't restrict the movement too much?
I have strong short springs that don't attract much to magnets.

ßart West-VL. · 2nd June 2012, 02:39 PM

Did a fast setup. The springs keep the magnets away and the magnets keep everything together by pulling force only. These are tough springs!
The coil is 20Ω DC , that's a pity but at the moment I have no other coil that is suitable.

It is vibrating clearly at only 10W but nowhere near 'buttkicker' levels of course. I don't expect to reach that efficiency either.

How to improve?

pic's or it never happened, right?

Alvis · 2nd June 2012, 02:45 PM

It's a good idea.

A regular enclosed subwoofer with a mechanical connection to the couch works great too.

Experiment, experiment.

Alvis · 4th June 2012, 03:07 PM

Any further progress here? Interesting project.

ßart West-VL. · 4th June 2012, 05:58 PM

Sorry Alvis. Haven't got time, living alone and full time job...
If I could just get a mechanical setup to work with but I doubt that magnets are a good thing, since they attract to the iron core by themselves, it might work against the goal.
I would like to experiment without core, or without magnets.

Any thought is appreciated!
Thanks for your interest.

NEO Dan · 5th June 2012, 05:23 AM

Your transformer suspended on springs in a C core wired out of phase:

ßart West-VL. · 5th June 2012, 05:10 PM

I don't get it completely, would the springs be between the coil and de C-core?
Where does the vibration come from?
I doubt the coil would want to jump up and down the core this way.

NEO Dan · 5th June 2012, 09:08 PM

Here you go, how about now?

ßart West-VL. · 6th June 2012, 05:11 AM

Thanks for the drawings.
I'll have to do more tests to see what it does. Just need some spare time first.
thanks.

2nd June 2012, 11:15 AM	#1
ßart West-VL. diyAudio Member Join Date: Jun 2005 Location: West Vlaanderen	linear actuator, buttkicker, etc... I'm planning on trying to build a good seat-shaker for a friend, just to experiment. I have strong magnets and a coil with a core. So I need a good suspension to get the coil and core centered between magnets. How can I build a good suspension that doesn't restrict the movement too much? I have strong short springs that don't attract much to magnets. __________________ Break in your loudspeakers at 35% RMS power Right-click→'save as...' Brown noise mono 192kbps(hit "repeat")

4th June 2012, 05:58 PM	#5
ßart West-VL. diyAudio Member Join Date: Jun 2005 Location: West Vlaanderen	Sorry Alvis. Haven't got time, living alone and full time job... If I could just get a mechanical setup to work with but I doubt that magnets are a good thing, since they attract to the iron core by themselves, it might work against the goal. I would like to experiment without core, or without magnets. Any thought is appreciated! Thanks for your interest. __________________ Break in your loudspeakers at 35% RMS power Right-click→'save as...' Brown noise mono 192kbps(hit "repeat")

5th June 2012, 05:10 PM	#7
ßart West-VL. diyAudio Member Join Date: Jun 2005 Location: West Vlaanderen	I don't get it completely, would the springs be between the coil and de C-core? Where does the vibration come from? I doubt the coil would want to jump up and down the core this way. __________________ Break in your loudspeakers at 35% RMS power Right-click→'save as...' Brown noise mono 192kbps(hit "repeat")

6th June 2012, 05:11 AM	#9
ßart West-VL. diyAudio Member Join Date: Jun 2005 Location: West Vlaanderen	Thanks for the drawings. I'll have to do more tests to see what it does. Just need some spare time first. thanks. __________________ Break in your loudspeakers at 35% RMS power Right-click→'save as...' Brown noise mono 192kbps(hit "repeat")

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2nd June 2012, 02:45 PM	#3
Alvis Banned Join Date: Apr 2012	It's a good idea. A regular enclosed subwoofer with a mechanical connection to the couch works great too. Experiment, experiment.

4th June 2012, 03:07 PM	#4
Alvis Banned Join Date: Apr 2012	Any further progress here? Interesting project.

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