how it works; the latest at the theme park: a magnetic attraction
The future transportation system in the United States is here.
Today, travelers can experience extraordinary acceleration with almost silent public transport and reach high speeds ---
If they like roller coasters
Suspension transportation system-wheel-
There are fewer trains hovering above the track and using a magnetic propulsion system called a linear induction motor.
But the country\'s amusement parks have accepted some of this technology to design rides for the tenacious heart.
Find adventurers in fast Gonzales
Just like experience can be gained from Superman, who claims to be the world\'s fastest roller coaster Six Flags Magic Mountain: escape in Valencia, California.
The linear synchronous motor pushes the passenger forward and then pushes the vertical track up to the height of the 41 th floor.
The people on this sledding device accelerated to 100 miles per hour in almost surreal seven seconds, subjected to force four times more than gravity, and then briefly fell free on the way down the mountain.
Six-flag designers have considered dragging Superman cars up the hill in the usual way, and then let gravity push them.
Travel at 100p. h.
This will take a starting point mountain of 350 feet high.
The six-flag high-class man, wearing a husband Steinbeck, said no one had ever built the first ordinary roller coaster with a mountain height of 200 feet.
The roller coaster \"California scream ad\" at Disney\'s California Adventure amusement park in Anaheim also uses linear induction motors to avoid traditional hills --and-chain start.
The car shot at the passenger on the first hump, speeding the car up to 55 metres. p. h.
Four seconds later.
Advertising can imagine a standard circular motor that can open the case and flatten it.
In a linear induction motor, the stator or static winding is embedded in the track.
When applying current, a moving magnetic field is generated, which generates a secondary magnetic field in aluminum or copper sheet attached to the side of the car.
The reaction between the two magnetic fields has driven the development of the car.
In a linear synchronous motor, copper or aluminum is replaced by large magnets under the car that are attracted or rejected by the magnetic field generated in the stator winding.
These cars travel at a speed that is synchronized with track and field speed.
Magnets make the system much heavier than the standard linear induction motor, but the synchronous system is more efficient, generates less heat and requires less power to move the car.
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The power supply control of California\'s screaming car is 100-yard-
In the long room below the bus, a 25-
Megawatt transformer power supply 5,000
Horsepower frequency conversion drive.
When the car begins to travel along the track, the jagged blades on the lower side of each car pass through more than 20 redundant optical sensors;
The time required for each blade to pass through the sensor indicates its speed.
Travel too fast, passengers will experience weightlessness;
The trip was too slow for the car to cross the mountain.
Empty cars require less power than full cars, so the power passed to the motor is adjusted to keep the car at the right speed.
Linear induction motors have been successfully used in many other applications such as sliding doors, airport luggage-
Short processing systemDistance-
Promoters of theme parks and parts
Supply system of factory.
But throw a group of dizzy teenagers in a 40-
The second ride is not the same as transporting thousands of passengers in hundreds of miles using the same technology.
Despite years of development, there is still no working rail transit system with linear induction or synchronous motors.
The Germans have tested the magnetic properties.
The suspension system combines magnetic propulsion for many years, but nothing has been built other than the test track.
The world\'s first magnetic
Suspension train system for 20-1
The mile route, which uses German technology in Shanghai, will open in 2004.
In the United States, five cities are considering using the maglev system in urban traffic, including the Pittsburgh system from Las Vegas to the California border. There is an ambitious connection between Los Angeles International Airport and Ontario Airport near San Bernardino.
A spokesman for the California maglev Alliance said that in the best case, this will be completed in ten years.
Sam Gurol, city maglev project manager at San Diego General Motors, said the transportation industry is very conservative.
\"They drew a line in funding an unproven technology.
\"GM has signed up with the Air Force to use linear induction motors to test the durability of its bunker.
The rocket will follow a magnetic-
The suspended track enters the structure at speeds up to 9 times the sound speed.
In theory, there is no limit on the speed of the moving object of the linear induction motor, but in the atmosphere, the actual limit is 400 m. p. h. , Mr. Gurol said.
This will be a fun amusement park tour.
Last Thursday, an article about linear induction motors in roller coasters incorrectly mentioned efforts to develop rail and traffic systems using such motors.
In fact, transportation systems in several cities, including Detroit, Tokyo and Vancouver and BC, have already used them.
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A version of this article was printed on page G00007 of the National edition on August 30, 2001, with the title: How it works;
The latest in the theme park: eye catching.