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Topic: Homopolar motor

	Homopolar motor - Wikipedia, the free encyclopedia
		A homopolar motor is of essentially the same construction as a homopolar generator, in general called a homopolar machine.
		Instead there are equal and opposite forces or torques on the two parts of the electrical circuit that carry the current, one of which must be able to slide or rotate (the rotor) while remaining in electrical contact with the other (the stator).
		Other people are confused about homopolar machine operation because they do not realise that while special relativity says there is no such thing as absolute linear motion, it does recognise absolute rotation, and this is borne out by experiment.
	en.wikipedia.org /wiki/Homopolar_motor (520 words)

	[No title]
		The upper curve (a) shows the motor armature input power with a constant motor field current of 6 amperes as the speed is varied with no generator magnet excitation and is seen to reach a maximum of 4782 watts as the speed is increased to 6500 rpm.
		Curve 14b shows the increase of motor armature power over that of curve (a) that results from energizing the generator magnet with a current of 16 amperes but with the generator output switch open so that there is no output current (and hence no output power dissippation).
		The total motor armature input power under these conditions is thus the sum of (a), (b), and (c) and reaches a maximum of 6028 watts at 6500 rpm.
	www.textfiles.com /conspiracy/dpalma5.txt (4569 words)

	U.S. Patent: 6049148 - Integrated magnetic levitation and rotation system - April 11, 2000
		The integrated magnetic motor and suspension system of claim 8, wherein said rotor is a continuous ring with plural pole teeth formed at its periphery and wherein said pole pieces have corresponding poles formed on their rotor-facing peripheries to produce a synchronous homopolar drive.
		The integrated magnetic motor and suspension system of claim 8, wherein said coils are each connected in series with a capacitor and excited by an AC current at a frequency such that the inductance of the associated coil provides a passive radial position control over said rotor.
		The integrated magnetic motor and suspension system of claim 8, wherein said position control current producing means includes means for sensing the magnitude of said currents and calculating from said sensed magnitudes the radial position of the rotor with respect to the stator assembly.
	www.everypatent.com /comp/pat6049148.html (6888 words)

	United States Patent Application: 0040256434
		The apparatus of claim 2, wherein said linear motor is one of a linear induction motor, a linear synchronous motor, a romag motor, a claw-pole motor, a homopolar inductor motor, a heteropolor inductor motor and a traklec motor.
		The machine of claim 23, wherein said linear motor is one of a linear induction motor, a linear synchronous motor, a romag motor, a claw-pole motor, a homopolar inductor motor, a heteropolor inductor motor and a traklec motor.
		Linear motor 28 also includes a cart or transporter 32 with magnet 34, which may be a permanent magnet or an electromagnet or a combination thereof.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040256434".PGNR.&OS=DN/20040256434&RS=DN/20040256434 (3729 words)

	NRL Press Release
		The previous known record for a motor having a high Tc field winding and operating at a temperature of 77 K was 5 hp.
		The motor is a dc homopolar or acyclic machine whose original design and construction used field magnets fabricated with niobium titanium superconducting wire, which is the most widely used superconducting material for magnet applications.
		The NSWC homopolar motor was selected to demonstrate the performance of the high Tc materials, because it is a fundamental property of homopolar machines that there are no forces developed on the field winding of the motor in reaction to the electromagnetically induced torque in its armature (rotor).
	www.nrl.navy.mil /pao/pressRelease.php?Y=1997&R=77-97r (769 words)

	Segmented magnet homopolar torque converter - Patent 4034248
		A homopolar motor and a homopolar generator are concentric and radially displaced from one another to provide a torque conversion arrangement.
		To achieve these results, a homopolar motor and a homopolar generator are each provided with a segmented magnet (i.e., a plurality of magnetic poles).
		In the case of a drum homopolar machine, which is the preferred embodiment disclosed herein, the conductors would be spaced along the axial length of the device; while in the case of a disc homopolar machine, the conductors would be radially spaced.
	www.freepatentsonline.com /4034248.html (3034 words)

	Homopolar motor-battery - Patent 4024422
		The homopolar motor-battery as recited in claim 1 wherein said magnets are fixedly mounted in said yoke with clearance provided for the rotation of said conductive disks and shaft within and between said magnets and shroud member.
		The homopolar motor-battery as recited in claim 1 wherein said magnets are fixedly mounted in said shroud member with clearance provided for the rotation of said conductive disks and shaft within and between said magnets and said shroud member.
		The homopolar motor-battery as recited in claim 10 wherein said electrochemically positive metal is selected from the group consisting of gold, silver, copper and nickel, and said electrochemically negative metal is selected from the group consisting of calcium, magnesium, zinc, and an alloy or amalgam thereof.
	www.freepatentsonline.com /4024422.html (1963 words)

	The hunt for compact power (Site not responding. Last check: 2007-10-31)
		The brushes remain a weak point today in the dc homopolar motor program, although advances in solid copper fiber and foil brush systems may prove these technologies better suited to a life at sea than their liquid metal counterparts.
		Motor manufacturers are inclined to build something for which they can sell many copies, Whitcomb said, and ac superconducting motors would be popular indeed for their low cost and energy savings.
		Superconducting motors can develop the same torque and horsepower within a motor frame that is nearly a third the size of a comparably rated conventional motor, Whitcomb said.
	www.memagazine.org /backissues/april00/features/hunt/hunt.html (2444 words)

	Generating Free Energy "Homopolar Style" (Site not responding. Last check: 2007-10-31)
		Known for over 150 years, the Faraday homopolar generator has been claimed to provide a basis for so-called "free-energy" generation, in that under certain conditions the extraction of electrical output energy is not reflected as a corresponding mechanical load to the driving source.
		In July, 1985, I became aware of and was invited to examine and test a so-called free-energy generator known as the Sunburst N Machine.
		The total motor armature input power under these conditions is thus the sum of (a), (b), and © and reaches a maximum of 6028 watts at 6500 rpm.
	www.unexplainable.net /artman/publish/printer_724.shtml (4580 words)

	Demonstrations (Site not responding. Last check: 2007-10-31)
		This motor may also be hooked to one of the lecture bench galvanometers to show that it can also be a generator.
		The smaller motors may be run off any DC power source as long as the voltage rating of each motor is not exceeded.
		In these motors the coil is the stationary part and the magnets are the rotating or moving part.
	faraday.physics.uiowa.edu /em/5K40.10.htm (592 words)

	Re: 12VDC Motor Control Problem
		If it is not a brush motor, then it must be a brushless or stepper or switched reluctance (or some other such thing) motor (since I rather doubt you have a homopolar motor).
		If you have some sort of brushless (or other) motor, and the motor and drive electronics are both supplied from 12 volts then there could be several problems which are affected by the design of the drive.
		The actual motor starting current though may be relatively low as the drive electronics acts to limit the current in order to protect itself from excessive current.
	www.control.com /976718618/index_html (1208 words)

	ZPEnergy.com - Future Energy eNews, Jan 10, 2005
		In the case of a homopolar generator, a voltage dependent on the rotational speed, magnetic field, and radius, is induced in a conductor moving within the magnetic field.
		When current is drawn from the homopolar generator, it also develops a J x B force for the same reason as with the motor but is referred to as back torque or armature reaction.
		The multi-rotor homopolar also does not include sliding contacts at each magnetized rotor rim but instead utilizes a suitable rolling means attached separately to magnets and also to the stator ring for intimately contacting and engaging non-slip rolling between magnets and stator as they orbit around the stator.
	www.zpenergy.com /modules.php?name=News&file=article&sid=1116 (1978 words)

	EVALUATION AND COMPARISON OF ELECTRIC PROPULSION MOTORS FOR SUBMARINES
		The superconducting synchronous motor utilized is loosely based on a design by American Superconductor and uses equations developed from the doctoral research by James L. Kirtley.
		The homopolar motor utilized is based on a novel design proposed by General Atomics.
		For each motor concept, a repetitive optimization algorithm is used in which the design parameters of each motor are randomly generated and the motor attributes are evaluated.
	quanterion.com /Documents/Documents.asp?ArgVal=2520 (303 words)

	Sea Power: Electric Drive for DD(X) Sparks Competition Over Exotic Motors
		DRS is a leading developer of permanent magnet motors, which use solid blocks of alternating north/south magnets made of a rare earth material called neodymium iron boron attached to the rotor to create a rotating magnetic field in place of the usual wire coils.
		Mongeau concedes that the 36-megawatt motor would be "the world's biggest permanent magnet motor." DRS built a 5-megawatt motor, which was tested by the Navy, and other firms have made permanent magnet motors up to 10 megawatts, he said.
		In case there are problems with the DRS motor, the Navy has a fallback in a 36-megawatt "advanced induction motor," a relatively safe upgrade to a conventional electric motor, Collins said.
	www.findarticles.com /p/articles/mi_qa3738/is_200409/ai_n9427289 (1551 words)

	Foresight Exchange (Site not responding. Last check: 2007-10-31)
		A high power density, high-torque electric motor of at least 36 megawatt will be available for use in the DD(X) destroyer or future cruisers on or before December 31, 2006.
		American Superconductor of Westborough, MA is developing a motor with even greater power density that is scheduled for testing in 2006.
		General Atomics of San Diego, CA is developing a direct current superconducting homopolar motor that operates at a colder temperature than the American Superconductor motor (about minus 400 degrees Fahrenheit).
	www.ideosphere.com /fx-bin/Claim?claim=ExMot (277 words)

	Roschin & Godin: Magneto-Gravity Effects; Verification of the Searl Effect
		Afterwards the electric motor is completely disconnected by the electromagnetic muff and the ordinary electrodynamics generator is connected to the basic shaft of the device through the same muff.
		The multi-rotor orbiting homopolar also does not include sliding contacts at each magnetized rotor rim but instead utilizes a suitable rolling means attached separately to magnets and also to the stator ring for intimately contacting and engaging non-slip rolling between magnets and stator as they orbit around the stator.
		Homopolar generator may be employed in reverse as a motor to convert electrical energy into mechanical energy.
	www.rexresearch.com /roschin/roschin.htm (8958 words)

	Electromagnetic Guns (Site not responding. Last check: 2007-10-31)
		The factor of 1/2 accounts for the fact that the field is B behind the slide and zero in front of it, the average being B/2.
		The railgun is in essence a single-turn motor.
		Linear motors might be on the threshhold of an evolution comparable to the evolution of rotary motors.
	www.oz.net /~coilgun/theory/electroguns.htm (4483 words)

	On the Nature of Electrical Induction
		Contemporary experiments have also shown the Faraday disc to be a superior motor or generator when the fixed exciting magnet is attached to and rotates with it, thereby removing a constant drag which is superimposed on the mechanical input, or output of the machine.
		As a motor the one-piece homopolar machine produces the same amount of torque as an equivalent two-piece induction machine for measurements made with a blocked rotor.
		The reduced drag obtained by physical connection of the magnet to rotate with the disc in the motor mode is not unambiguously useful since the torque output of the machine is only with respect to the rotating reference frame of the machine.
	depalma.pair.com /Absurdity/Absurdity09/NatureOfElectricalInduction.html (3515 words)

	Robert Kincheloe: N-Machine Test
		The generator may be recognized as a so-called homopolar, or acyclic machine, a device first investigated and described by Michael Faraday [3] in 1831 (Figure 4 and Figure 5) and shown schematically in Figure 6.
		Various homopolar devices have been used for specialized applications [9] (such as generators for developing large currents for welding, ship degaussing, liquid metal magnetohydrodynamic pumps for nuclear reactor cooling, torque motors for propulsion, etc.), some involving quite high power.
		The generator was driven by a 3 phase AC 40 horsepower motor by a belt coupling sufficiently long that magnetic fields of the motor and generator would not interact.
	www.rexresearch.com /kinchelo/kinche~1.htm (4589 words)

	The 'N' Effect - Bad Astronomy and Universe Today Forum
		Now Micheal Faraday created the first Homopolar generator in (1831, I think), which it essentially what this is, but it was in 1979 that the Sunburst N-machine was made.
		Most electric motors have 20 to 200 turns of wire each generating or moving in a magnetic field and in this way are very efficient as the voltage(pressure of electricity) is high and current(flow of electricity) is low and so very small sections of wire can be used.
		The homopolar generator would have an application in say the electroplating industry where they need low voltages and high currents and if they had to generate their own power then this sort of machine could be usefull.
	www.bautforum.com /showthread.php?t=27143 (1795 words)

	Chapter 2: Electromagnetism
		This version is called a linear homopolar motor.
		The homopolar motor was one of the first motors ever built.
		Unlike our previous motors, this one does not change the poles of an electromagnet from north to south and back.
	www.scitoys.com /scitoys/scitoys/electro/railgun/railgun.html (1138 words)

	PIRA 5K10.00 INDUCED CURRENTS AND FORCES (Site not responding. Last check: 2007-10-31)
		Orient a motor driven coil in various ways in the earth's field while the output is displayed on an oscilloscope.
		A motor driven coil of several hundred turns gives a different galvanometer deflection depending on the orientation.
		Turn a large aluminum wheel by hand with the edge of the wheel and a pickoff brush between the poles of a magnet.
	www.physics.ncsu.edu /pira/5eandm/5K10.html (1121 words)

	Military Applications of Superconductivity (Site not responding. Last check: 2007-10-31)
		Purpose and Application: Superconducting solenoidal coils serve as field coils in homopolar motors that can produce more torque and horsepower for their weight, while also running potentially quieter than any other motor.
		Example: A 3000 HP homopolar motor that used superconducting field coils is shown being tested at the Naval Surface Warfare Center in Annapolis Maryland to assess the performance in quite ship electric drive applications is shown below.
		A concept for a larger, more advanced superconducting homopolar motor designed by the Naval Surface Warfare Center, Annapolis is is also shown.
	members.tripod.com /mikeheiberger/page6.htm (119 words)

	PRESOL \| A \| Full Scale (Prototype), Superconducting DC Homopolar Motor Propulsion System Technology Demonstrator \| ...
		This Broad Agency Announcement is directed specifically to superconducting dc homopolar motor approaches that can provide significant improvements over ship propulsion motors currently available or under engineering development.
		Technical approaches are sought which will allow a substantial increase in torque and power density relative to the current state of the art, with weights, dimensions and aspect ratios that are also compatible with efficient podded propulsion of a Naval surface combatant.
		The program will conclude with delivery of a motor, associated motor controller, transformer/switchgear, and controls and any ancillary equipment needed to test the motor at a U.S. Navy facility to be determined at a later date.
	www.fbodaily.com /archive/2004/05-May/22-May-2004/FBO-00589787.htm (495 words)

	EM Timeline
		FARADAY is asked to investigate electromagnetism and quickly produces his "Electromagnetic Rotator", which is the world's first Electric Motor (and is powered by DC and is non-commutated), and it is also the world's first electromechanical power converter that is both homopolar in structure and "Acyclic" in operational nature.
		Shown on the left is a drawing of Faraday's apparatus for producing the rotation of an electric current-carrying conductor around a magnetic pole (which was manufactured and sold to other investigators in 1822.) Shown on the right is a two-figure drawing of an 1850's modification of Faraday's two electromagnetic rotator apparatus.
		This device is also a DC motor and is homopolar (but not acyclic.) Shown is a model probably made for Faraday in 1823 (notice the difference in the intersection between the wheel and the magnetic poles in Faraday's model and that in the background sketch from Barlow.)
	pixii.com /apparatus.htm (3035 words)

	5K10.80 Homopolar Generator
		Thomas D. Strickler, Variation of the Homopolar Motor, AJP 29, 635 (1961).
		Thomas Strickler, Motional emf's and the Homopolar Motor, AJP 32, 69, (1964).
		Stanislaw Bednarek, Unipolar motore and their application to the demonstration of magnetic field properties, AJP 70, 455-458 (2002).
	www.physics.brown.edu /physics/demopages/Demo/em/demo/5k1080.htm (1485 words)

	SAN DIEGO--- General Atomics to Design and Fabricate Advanced Propulsion Motor for US Navy (Site not responding. Last check: 2007-10-31)
		Under this contract, GA will deliver a 36.5-megawatt, 120-rpm advanced design prototype motor, motor drive, and support equipment, which will be shipped to a US Navy facility for full-performance testing.
		Under earlier contracts, GA designed, fabricated, and tested a test-stand motor at the 300-kilowatt level, upgraded this motor to the 3.7-megawatt level for further testing, and completed the preliminary design of the 36.5-megawatt motor.
		The homopolar motor program is being carried out in GA's Electromagnetic Systems (EMS) Division, which currently has several projects aimed at increasing electrical functionality aboard Navy ships.
	www.freshnews.com /cgi-bin/jsj_news/print.cgi?article_ID=22220 (354 words)

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