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Topic: Linear induction motors

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	Linear motor - Wikipedia, the free encyclopedia
		A linear motor is essentially an electric motor that has had its stator "unrolled" so that instead of producing a torque (rotation), it produces a linear force along its length.
		Outside of public transportation, vertical linear motors have been proposed as lifting mechanisms in deep mines, and the use of linear motors is growing in motion control applications.
		High-acceleration linear motors also require very strong magnetic fields; in fact, the magnetic fields are often too strong to permit the use of superconductors.
	en.wikipedia.org /wiki/Linear_motor (919 words)

	Electric motor - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.cs.virginia.edu) (Site not responding. Last check: 2007-11-04)
		Through electromagnetic induction, the rotating magnetic field induces a current in the conductors in the rotor, which in turn sets up a counterbalancing magnetic field that causes the rotor to turn in the direction the field is rotating.
		Induction motors are the workhorses of industry and motors up to about 500 kW (670 horsepower) in output are produced in highly standardized frame sizes, making them nearly completely interchangeable between manufacturers (although European and North American standard dimensions are different).
		A linear motor is essentially an electric motor that has been "unrolled" so that, instead of producing a torque (rotation), it produces a linear force along its length by setting up a traveling electromagnetic field.
	en.wikipedia.org.cob-web.org:8888 /wiki/Electric_motor (6401 words)

	Linear motion: An introduction to linear induction motors: Explain that Stuff!
		Linear motors are used in maglev trains, which have been enthusiastically developed in both Germany and Japan.
		Linear motors are now used in all sorts of machines that require linear (as opposed to rotational) motion, including overhead traveling cranes and beltless conveyors for moving sheet metal.
		In a traditional electric motor, a central core of tightly wrapped magnetic material (known as the rotor) spins at high speed between the fixed poles of a magnet (known as the stator) when an electric current is applied.
	www.explainthatstuff.com /linearmotor.html (1107 words)

	Basics of Design Engineering - Electrical/Electronic - AC Motors - AC linear motors
		A linear motor is conceptually a rotary motor whose stator core has been cut and unrolled.
		The moving member in a linear motor is typically a solid conducting plate or sheet.
		Linear motors also need the secondary to be wider than the primary.
	www.machinedesign.com /BDE/Electrical/bdeee2/bdeee2_2.html (729 words)

	Welcome to The Center for Electromechanics
		The figure shows the unraveling of that motor to form a linear induction motor; the armature winding is excited with phased current to simulate the field pattern in the previous figure.
		The primary difference between linear electric motors and conventional electric motors is the length of either the primary or the secondary.
		When the motor designs are completed and evaluated, it is likely that additional research will focus on optimizing the track itself: characterizing the lift magnets that provide the levitation forces and determining the best shape for the fixed reaction rail against which the LIMs will push.
	www.utexas.edu /research/cem/Maglev_Davey.html (1094 words)

	Linear Motors and Stages: Baldor, a leader in motion control, servo, linear motors, energy efficient electric motors ...
		Linear motors consist of two parts – a stationary track or “platen” and a moving “forcer”.
		They can be provided as a stand-alone linear motor assembly or as a complete stage – built with a housing or enclosure with linear bearings, limit switches, cable track/carrier, protective bellows and linear encoder in a wide variety of lengths.
		The linear induction motor consists of a “primary” which is a coil assembly, and a “reaction plate”.
	www.baldormotion.com /products/linearproducts/overview.asp (1257 words)

	Roller Coaster Research Paper (Site not responding. Last check: 2007-11-04)
		Linear Induction Motors are integrated into roller coasters by making fins out of a non-ferrous, conductive metal, usually brass or aluminum, that act as the reaction plates and are attached to each side of the train (Reitz).
		Linear Synchronous Motors are incorporated into roller coasters by placing the motors between the rails of the track along a straight section.
		LIMs are often designed to go on the sides of the track because this eliminates structural design challenges created by placing the LIMs in the center of the track.
	members.aol.com /shupepaper/rca-i.html (404 words)

	Copley Motion Systems----TT Micro
		The tubular linear motor has only two components, the rod and the forcer.
		Linear Electric Motors provide direct thrust for the positioning of a user's payload.
		The benefits of linear motors are readily available to machine manufacturers throughout industry.
	www.copleycontrols.com /motion/technologies/motor (431 words)

	A linear motor primer
		Typically, the "rotor" or reaction plate in a linear induction motor is a non-magnetic conductor such as aluminum or copper.
		Inductive motors propel a conductive reaction plate (or wound rotor coil) along a moving magnetic field by inducing a secondary magnetic field in the rotor.
		Linear induction motors require either a ferrous backing plate on the reaction plate, or a matched stator coil to form a double-sided LIM in order to provide an adequate magnetic field in the reaction plate.
	capital2.capital.edu /admin-staff/dalthoff/lim.html (2798 words)

	Motors and Drives Conference 2007 - Brought to you by eDrive Magazine (Site not responding. Last check: 2007-11-04)
		In the past, linear motors have generally been constrained to the stroke of a single stator, limiting the range of motion.
		If this limitation can be surmounted, linear motors can overcome many of the limitations inherent in conveyor systems including high maintenance, low accelerations, uncontrolled movement profiles, and the inability to independently move individual payloads.
		Numerous motor metrics, including efficiency measurements, are used to show how axial motor performance compares to other motor types and some of the fundamental differences between radial and axial motors are examined.
	www.e-driveonline.com /motors_conf_program.htm (3873 words)

	News & Analysis
		The Navy's idea is to use a linear induction motor, driven into explosive motion by energy from an advanced storage system, to catapult aircraft into the air.
		The heart of the EMALS is the 103-meter-long linear induction motor, which propels an armature, with the aircraft attached.
		The linear motor of the EMALS is powered by energy from rotational storage devices that draw electric power from the ship's electrical distribution system.
	www.mae.ncsu.edu /courses/Mae535/buckner/EMALS.htm (979 words)

	Mr Freeze - Six Flags Over Texas
		Powered by unique, linear induction motors, Guests are sent streaking out of the tunnel and into a totally vertical climb, eventually twisting until the car is completely upside down.
		The ride's linear induction technology allows the design of a roller coaster that does not contain the traditional "lift hill." With this state-of-the-art technology, instantaneous speed can be engineered by creating a system of magnetic waves that launch the vehicle forward (or backward).
		There are 228 linear induction motors (LIMs) imbedded in the track to create the magnetic waves necessary to propel the coaster car at speeds up to 70mph.
	www.coasterphotos.com /SFOT/mrfreeze.htm (301 words)

	LMAC - AC Linear Induction Motor: Baldor, a leader in motion control, servo, linear motors, energy efficient electric ...
		The single sided Linear Induction Motor consists of a primary coil assembly and a secondary called a reaction plate.
		The coil assembly is comprised of steel laminations and phase windings with a thermal sensor encapsulated in thermal epoxy.
		Should the coil assembly be the moving element of the motor then the reaction plate length must be equal to the length of stroke plus the length of one coil assembly.
	www.baldor.co.uk /products/linearproducts/lmac.asp (510 words)

	Linear Induction Catapult Motors (Site not responding. Last check: 2007-11-04)
		linear induction motors combine direct-drive, high-thrust with an ultra high-strength vehicle mounted reaction rail.
		The LIM catapult motor is designed for either a repulsive or neutral vertical force; there is no magnetic attraction between the reaction rail and the stator.
		LIMs are now a popular method of launching steel roller coaster carriages up to 70 mph on a horizontal take-off zone and not requiring an uphill start ramp.
	www.powersuper.com /licm.html (313 words)

	Characteristics of a Freight Pipeline Transportation System
		Linear electric motors belong to a special group of electrical machines that converts electrical energy directly to mechanical energy in translational motion [13-20].
		A linear induction motor (LIM) consists of a primary and a secondary.
		A linear synchronous motor (LSM) has a similar structure, except that its secondary must be either a permanent magnet or a wound field with a direct current.
	faculty.washington.edu /jbs/itrans/zhao.htm (2628 words)

	Force Engineering's Introduction To Linear Motors
		LIM thrusts vary from just a few to thousands of Newtons, depending mainly on the size and rating.
		The stator, usually known as the LIM, consists of a 3 phrase winding in a laminated iron core.
		The LIM is ideal for applications where space is at a premium.
	www.force.co.uk /page2.html (799 words)

	Linear Induction Magnets - A Great Resource of Information (via CobWeb/3.1 planetlab2.cs.virginia.edu) (Site not responding. Last check: 2007-11-04)
		These are induction motors, which consists of a copper clad rod...
		Linear Induction Motors (LIMs) Definition Large, flat magnets arranged along a track; used to generate thrust Context LIMs were first developed to launch spacecraft into orbit.
		The corresponding linear resolutions of one VLT UT and the VLTI are indicated.
	www.magnetpad.com.cob-web.org:8888 /linearinductionmagnets (1453 words)

	Electric motors and generators
		As in the DC motor, the ends of the coil connect to a split ring, whose two halves are contacted by the brushes.
		When the motor is loaded, then the phase of the voltage becomes closer to that of the current (it starts to look resistive) and this apparent resistance gives a voltage.
		Similar linear motors, although of course without the paper cone, are often used to move the reading and writing head radially on a disc drive.
	www.phys.unsw.edu.au /~jw/HSCmotors.html (4701 words)

	Mr. Freeze's Linear Induction Motors (Site not responding. Last check: 2007-11-04)
		Each LIM unit has a large letter stenciled on it (these are "A" type units).
		LIMs are generally a non-contact propulsion system, and where the only moving parts are the (in this case) vehicles themselves.
		Another interesting observation is that some kind of a jig is in place on the LIM to the right of the picture, compared to the one to the left.
	home.comcast.net /~gep-2/mrfrlims.html (625 words)

	Re: [femm] Linear induction motors
		The thing is, we made a double face linear induction motor, based on an ordinary induction motor.
		Propelling the disk the motor current was very small and as your program has proved there was no saturation.
		We are now increasing the motor current, and we decided to use the Iron-Si 4% magnetization curve.
	femm.foster-miller.net /list/msg00190.html (449 words)

	SERAPHIM (Site not responding. Last check: 2007-11-04)
		The Segmented Rail Phased Induction Motor (SERAPHIM), developed at Sandia National Laboratories, is a new type of linear induction motor (LIM) offering unique capabilities for high-thrust, high-speed propulsion for urban maglev transit, advanced monorail, and other forms of high-speed ground transportation.
		Linear induction motors are already in use for applications such as airport transit systems, subway systems, theme park rides, and industrial material handling systems.
		SERAPHIM is an improvement on the conventional linear induction motor in that it allows larger tolerances and results in a more efficient motor.
	www.sandia.gov /seraphim (155 words)

	..: INTELTEK AUTOMATION PVT. LTD. :.. (Site not responding. Last check: 2007-11-04)
		Baldor is the single source for linear motors and linear stage products.
		Standard and custom linear motor and positioning stages are available.
		Induction motor speeds to 270 in/sec [6.8 m/s] at 60hz to 2000 in/sec [50 m/s] at increased frequency.
	www.inteltekindia.com /products/components/linearmotors.asp (101 words)

	PUBLIC ROADS On-Line (Autumn 1994): Tube Freight Transportation
		One modern proposed system called SUBTRANS uses capsules that are electrically powered with linear induction motors and run on steel rails in a tube about two meters (6½ feet) in diameter.
		This system, which proposes to use linear induction traction, is currently being evaluated and developed by the Ministry of Construction.
		Linear induction motor powered systems are also technically feasible although such systems have not been demonstrated or, in fact, designed in detail yet.
	www.tfhrc.gov /pubrds/fall94/p94au21.htm (3943 words)

	NDM Article - Navy to Phase Out Steam Catapults on Carriers
		It has an energy storage device, a power conditioning system, a linear motor and a closed-loop control system.
		The technology that the Navy asked contractors to use is called linear induction motors, noted Michael Doyle, a Navy electrical engineer.
		The linear induction motors make it possible for the vehicle being launched to transverse the length of the catapult (about 300 feet) at speeds ranging from 55 knots to 200 knots, depending on the size of the aircraft.
	www.nationaldefensemagazine.org /issues/2001/Jul/Navy_to_Phase.htm (624 words)

	Remote Actuator at Actuatorlinear.Com (via CobWeb/3.1 planetlab2.cs.virginia.edu) (Site not responding. Last check: 2007-11-04)
		Related terms are c-band actuator motor replacement, actuator subsea, the netherlands aerospace control manufacturers ac, snow plow actuator, and column actuators.
		Linear limit switches are electromechanical devices this demand physical contact between an object in addition to the switch's activator to build the contacts change state.If you wish a particular motor bike suited on behalf of my terrain, select our Quick-Change Sprocket kit.
		Related terms are linear permanent magnet motor, rotary actuator side load, dc linear actuators, making a voice coil actuator, and blend door actuator.
	www.actuatorlinear.com.cob-web.org:8888 /REMOTE%20ACTUATOR.htm (663 words)

	Induction Motors - Induction Motor Manufacturers, Induction Motor Suppliers, Induction Motors Exporters
		Manufacturers of centrifugal monoset pump, centrifugal pump, centrifugal water pump, induction motors, pumps, self priming pump, single phase ac induction motor, submersible pump, submersible water pump and three phase ac induction motor.
		Manufacturers of traction motors, linear induction motors, electrical rotating equipment for the rail and mass transit Industry.
		Importers of stepper motor, servo motor linear and induction motor.
	www.digitivity.com /industrial-materials/motors/induction-motors.html (1292 words)

	Maglev Linear Induction Propulsion Motors (Site not responding. Last check: 2007-11-04)
		Maglev Linear Induction Motors (LIM) combine direct-drive, high-thrust with an ultra high-strength guideway-mounted reaction rail.
		The Maglev propulsion motor is designed for either a repulsive or neutral vertical force; there is no magnetic attraction between the reaction rail and stator.
		Maglev LIMs are for use with urban transit vehicles having electrodynamic or superconducting suspension and guidance.
	www.powersuper.com /lipm.html (271 words)

	How Do Linear Induction Motors Work? (Site not responding. Last check: 2007-11-04)
		Linear Induction Motors, LIMs, are a technology that you'll be seeing a lot more from.
		They are exceedingly reliable, require almost no maintenance, can provide very large accelerations (faster than friction-type drives), and have the huge advantage of allowing a totally passive vehicle (in an automobile replacement system, this means that you don't have to have a portable energy source or prime mover at all in the (thus lightweight!) vehicle...
		Freeze LIMs are (C) 1997 Winkle Electric, used by permission.
	home.comcast.net /~gep-2/limswork.html (357 words)

	Linear Induction Motors
		A basic LIM roller coaster works by placing hundreds of tiny motors along the coaster track at key places were acceleration will be needed – at the launching pad and at the base of each element (twists, turns, inversions, etc.).
		Within an LIM the stator (the fixed part of a rotating machine) is flattened out so that it will produce a linear force along its length.
		This coaster uses LIMs to accelerate the ride through the ride in one direction, and when the end of the track is reached LIMs once again accelerate the ride, this time to ride the track backwards.
	www.unc.edu /~bhuang/limcoasters.htm (502 words)

	Roller Coaster Hurtles Power System into Voltage Troubles (Site not responding. Last check: 2007-11-04)
		All electric motors contain a rotor that is magnetically pulled by the electromagnetic field of the stator.
		To generate the torque needed to accelerate the ride, the linear-induction motors require brief but very large amounts of real and reactive power.
		Although peak reactive demand actually turned out to be much greater than expected, motor terminal voltage is now precisely maintained, so operation of the roller coaster is consistently successful.
	www.emediawire.com /releases/2004/1/emw100134.htm (522 words)

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