question about LIMs

Wednesday, May 1, 2002 11:31 AM
I have been wondering for a while, are LIM fins on the bottom of the car like the brake fins or are they on the side? can someone show me a picture of the LIM fins and LIM motors on a coaster. Thanks in advance.
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Wednesday, May 1, 2002 11:35 AM
the LIM fins are on the side.if i find a picture i'll post the site

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Nitro!!! #1

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Wednesday, May 1, 2002 11:36 AM
thanks man, i remeber loking at chiller and seeing things on the side when i wasnt an enthusiast but i didnt know they were LIMS
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Wednesday, May 1, 2002 11:38 AM

http://www.rcdb.com/installationgallery544.htm?Picture=3

the fins on the side of the car are them

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Nitro!!! #1

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Wednesday, May 1, 2002 11:43 AM

Yet another pic showing the LIMs and fins at the same time.

http://www.sfotcoasternet.com/gallery/photo.php?photoid=10

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Wednesday, May 1, 2002 12:10 PM
thank you guys your awesome
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Wednesday, May 1, 2002 12:57 PM

It depends entirely on the manufacturer. Intamin has their fins under the car, and on some rides (like Volcano) uses them braking as well (with LIM's).

The Premier rides have the fins on the outside with seperate friction brake fins under the train.

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Jeff - Webmaster/Admin - CoasterBuzz.com, Sillynonsense.com
"As far as I can tell it doesn't matter who you are. If you can believe, there's something worth fighting for..." - Garbage, "Parade"

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Wednesday, May 1, 2002 1:03 PM

I also have a question about LIM's.

Since they are magnetic. How do you turn a magnet off?

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Wednesday, May 1, 2002 1:06 PM
Well, they are electromagnets (emphasis added). No electricity, no magnet. Basically, you just turn the power off.
jeremy
--giving the layman's answer
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Wednesday, May 1, 2002 1:15 PM
well does anybody have a pic of volcano or an impulse set of lims? and does the same company make the lims for both intamin and premier? and are they the smae thing basiccly? (sp?)
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Wednesday, May 1, 2002 1:21 PM

never mind i found one

http://rcdb.com/installationgallery1143.htm?Picture=2

are the LIMs on it those things in the center of the track? btw its V2 at SFMW

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Wednesday, May 1, 2002 1:34 PM
I THINK they work by a capacitor(s) discharging into the LIM. This is only speculation, but I think the capacitors charge up during the much discussed (about WT anyways) "cool-down" period. Then just use the good ol' "right-hand rule." to find out where the current is going. I'm sure it's a LOT more complicated than that, but I hope that helps.

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Ride the New England Bush!

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Wednesday, May 1, 2002 2:00 PM
Here is a web page along with some pictures about LIMs off of Daves site
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Wednesday, May 1, 2002 2:54 PM
You wouldn't use a cap to run a LIM because industrial LIMs operate off of 3-phase AC current. The 3-phase gives you direction, the AC gives you a wave propogation velocity.

The only ride I can think of off-hand that I know for certain uses LIMs for braking is Superman: Ultimate Escape at Six Flags at Geauga Lake and its Vertical Velocity clones. Those use LIMs operated at stall for the "holding brake" at the top of the back spike. The Intamin impulse coasters also use the LIMs for fine positioning in the station, which is what all that back-and-forth screeching is about. For braking, those rides use permanent magnet brakes which drop into place along the course between the LIM coils; I believe the LIMs are simply shut off during braking.

Thanks, FoF for the plug. I guess you appreciate that those are your LIMs pictured on my LIM page... :)

--Dave Althoff, Jr.

*** This post was edited by RideMan on 5/1/2002. ***

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Wednesday, May 1, 2002 3:06 PM
Hmm...are you sure?

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Ride the New England Bush!

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