LSM or LIM

[hyyyper]

what is exactly the difference between LSM and LIM?
and does the M stand for motor(s) or magnet(s)?
plz help ...

Linear Syncronus Motor [Don't know how to spell]

Linear Induction Motor

I think!

[Dirk_Ermen]

lim works with magnets that launch the track and lsm is just some kind of cable launch. I guess that's the difference... From what i've seen on lsm and lim tracks...

No.

LIM: Linear Induction Motor. Principle: metallic fins under the car slide through gaps in electro-magnets along the launch track. the electro-magnetic induce a magnetic field into the fins. the two magnetic fields cause the train to move forward. This system is pretty cheap. Typical launch force is around 1.4g to 1.6g AFAIK.

LSM: Linear Synchronous Motor. Opposed to a LIM the trains on a LSM-launched coaster have permanent magnets under them. Electro-magnets along the launchtrack need to be pulsed precisely in a synchronous pattern to move the train. This system is more expensive and requires more energy and more precision. Hower the acceleration might be a bit higher than on a LIM (probably up to 1.8g).

So, basically these are similar systems as they both use electromagnetic fields to move the train.

Other launches:
Pneumatic launch or Compressed-AIr-launch: Used on Dodonpa for example. Compressed Air accelarates the coaster out of the station. Basically works like an air gun. On Dodonpa the trains reach 107mph in just 1.8 seconds which can be calculated to be an average acceleration of 2.7g.

Hydraulic Launch: Used on Top Thrill Dragster and Xcelerator for example. A cable on a spool is being attached to the train. The spool starts rotating, causing the train to move forward. Old Schwarzkopf shuttleloops used the same technique, but they had electromotors to rotate the spool. On TTD they use a hydrulic motor. The fluid used is pressed through those motors by compressed gas. According to Cedar Point TTD reaches 120mph in 4 seconds. This gives an average of 1.4g.

Buster.

http://www.rcdb.com/ig140.htm?picture=11

LSM

http://www.rcdb.com/ig1571.htm?picture=10

LIM

I believe most coasters now and changing to Hydrualic launches (well Intamin) i.e. Top Thrill Dragster, Kingda Ka etc. There is of course also Weight drop luanches...

[hyyyper]

thanks for the info u guys
but i heard that escape has the batery for the train fins in the cars itself, is that true, i thought it was because of the size of the car

vekoma also swithed from lim's (xpress/superman the ride/rock'n'rollercoaster) to hydraulics (boosterbike)

There are no batteries, just magnets under the car.

[hyyyper]

Originally posted by Fornication Nation

There are no batteries, just magnets under the car.

that's what i was trying to explain, but its kinda hard. at intamin accelerator coasters the fins on the track are powerd and on escape the fins on the train are powerd, is that right? and if it isnt why is the car that size

Superman: The Escape uses a type of magnet called a rare earth magnet. These magnets are not electro magnets, but come out of the ground fully magnetized, like the magnets we played with as kids. Then, along the track, there are a series of powerful electro-magnets called staters that are magnitized just ahead of the train. The magnets on the train are attracted to the energized staters, and so the train is pulled forward by the magnetic attraction. The magnets on the trains are incredibly large and bulky, which is one reason the trains are so large. High weight and fast speed means that the wheels have to be really big to reduce frictional wear. When the wheels get bigger, the whole train must get bigger to accomidate them.

In a LIM launched coaster, there is a copper fin which is induced with an electric field. Then, the energized fins are attracted to the magnetic pull of the electro-magnets lining the launch to produce acceleration.

[Dirk_Ermen]

Originally posted by Fornication Nation

There are no batteries, just magnets under the car.

would be fun if you hear when ur Q'ing for the ride, Storry for the delay, the batteries were empty and we had to replace it

Or if ur just in the station and you see that they are putting simple AA batteries under the car. [lol]

[hyyyper]

or saying, come back in half an hour, we need to plug the battery in a recharge it

Ok here how it is.
LIM-A Linear Induction Motor (LIM) is basically a rotating squirrel cage induction motor opened out flat. Instead of producing rotary torque from a cylindrical machine it produces linear force from a flat one. It is not a new technology but merely design in a different form. Only the shape and the way it produces motion is changed. But there are advantages: no moving parts, silent operation, reduced maintenance, compact size, ease of control and installation. LIM thrusts vary from just a few to thousands of Newtons, depending mainly on the size and rating. Speeds vary from zero to many meters per second and are determined by design and supply frequency. Speed can be controlled by either simple or complex systems. Stopping, starting, reversing, are all easy. Applications are many and varied, ranging from simple sliding doors to full control of a ten tonne vehicle.

LSM-For

those who don't know, an LSM(Linear Synchronizable Moters) launch is where

you have a row of magnets with opposite polls down the track and one with the same

polls on the car. The magnets will pull/push(depending on where the car is) the car down the track.

LSM are alot harder to get working too.

Originally posted by Dirk_Ermen

Originally posted by Fornication Nation

There are no batteries, just magnets under the car.

would be fun if you hear when ur Q'ing for the ride, Storry for the delay, the batteries were empty and we had to replace it

Or if ur just in the station and you see that they are putting simple AA batteries under the car. [lol]

tanoid: attention riders, does anyone have any of those stupid square batteries which are ridiculously expensive and have no real good use for them? duracell preferable,