Linear induction motor
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A linear induction motor (LIM) is a form of electro-magnetic propulsion containing no moving parts. They may replace a traditional lift hill and brakes. Typically LIM systems launch the roller coaster train from the station extremely quickly. They have since been superseded by linear synchronous motor technology.
The first use of linear induction motors for launching a train was in 1996 with the opening of Flight of Fear at Kings Island and its clone at Kings Dominion. Unlike prior launched roller coasters, which used a weight drop launch, flywheel launch or electric winch launch, LIM technology requires no mechanical contact between the track and the train, reducing wear and tear.[1]
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| Roller coaster descriptions | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Basic elements | Brake run • Station | ||||||||
| Advanced elements | Bunny hill • Headchopper • Inversions • Pre-Drop • Tunnel | ||||||||
| Propulsion | Lift hill (Cable • Catch car • Chain • Electric spiral • Elevator • Ferris wheel • Friction wheel • Spiral)
Powered launch (Cable • Counterweight • Friction wheel • Flywheel • Compressed air launch • Electric winch launch • Hydraulic • LIM • LSM) | ||||||||
| Technology | Block brakes • Car • On-ride camera • On-ride soundtrack • Test seat • Train • Track • Transfer track • Wheel assembly | ||||||||
| Other | Chicken exit • Exclusive ride time • POV • Queue line • Rollback • Theming | ||||||||