| 单词 | permanent magnet |
| 例句 | Others like U.S. startup Niron Magnetics are developing permanent magnets without rare earths. Focus: Automakers' drive to avoid China's EV rare earth dominance gathers speed 2023-11-14T05:00:00Z The company is also working on rare earth free permanent magnets. The automakers and suppliers pushing to cut rare earths from EVs 2023-11-14T05:00:00Z The rare earth oxides are used in making high-strength permanent magnets for electric vehicle motors, wind turbines and consumer electronics. Stellantis reaches preliminary deal for rare earth minerals with NioCorp 2023-07-06T04:00:00Z For years, some researchers have been striving to build scanners that use much smaller permanent magnets, made of the alloy often found in desk toys. MRI for all: Cheap portable scanners aim to revolutionize medical imaging 2023-02-22T05:00:00Z The European Raw Materials Alliance notes that while the European Union has a massive electric-motor manufacturing sector, “it is almost fully import dependent” when it comes to rare earth permanent magnets. Sweden finds rare earth deposits that could benefit Western consumers 2023-01-13T05:00:00Z And where western automakers are sticking with rare-earth permanent magnets, they are working to dramatically reduce their content, he added. Focus: Automakers' drive to avoid China's EV rare earth dominance gathers speed 2023-11-14T05:00:00Z Toyota is working on a permanent magnet with a 50% reduction in neodymium, a heavy rare earth. The automakers and suppliers pushing to cut rare earths from EVs 2023-11-14T05:00:00Z Conversely, a permanent magnet can be demagnetized by hard blows or by heating it in the absence of another magnet. College Physics for AP Courses 2015-08-12T00:00:00Z Paramagnetic and diamagnetic materials do not act as permanent magnets. Chemistry 2019-02-14T00:00:00Z The Sarfartoq project does not contain elevated levels of uranium, but has high levels of neodymium and praseodymium, two essential elements for rare earth permanent magnets, Hudson has said. Neo agrees to buy Greenland rare earth project from Hudson Resources 2022-08-22T04:00:00Z Automakers have mostly relied on motors with rare earth-based permanent magnets, which have been the most efficient at providing the torque to power EVs. Focus: Automakers' drive to avoid China's EV rare earth dominance gathers speed 2023-11-14T05:00:00Z Electric motor component maker EuroGroup Laminations is working on both rare earth free permanent magnet motors and motors with limited rare earth content for automaker customers. The automakers and suppliers pushing to cut rare earths from EVs 2023-11-14T05:00:00Z Their response to a current-carrying coil and a permanent magnet is seen to be very similar, especially near the ends of the coil and the magnet. College Physics for AP Courses 2015-08-12T00:00:00Z Schaeffler, Germany’s fifth biggest auto supplier by revenue, is also working with European partners to use the rare earths processed by REEtec to produce permanent magnets. EV parts maker Schaeffler signs first of a kind European rare earth deal 2022-04-19T04:00:00Z MP Materials, a mining company, is also investing $700 million to create 350 jobs in the sector developing permanent magnets, which are used in electric-vehicle motors, defense systems, electronics and wind turbines. Biden calls for more domestic production of rare minerals, says U.S. cannot depend on China 2022-02-22T05:00:00Z But different types of motors without permanent magnets that were previously too big and too inefficient, or those with greatly-reduced rare earth content have become commercially viable, prompting the rush for alternatives. Focus: Automakers' drive to avoid China's EV rare earth dominance gathers speed 2023-11-14T05:00:00Z Tesla initially used induction motors without rare earth permanent magnets, but switched to a permanent magnet motor for the mass-market Model 3 in 2017. The automakers and suppliers pushing to cut rare earths from EVs 2023-11-14T05:00:00Z A group of materials made from the alloys of the rare earth elements are also used as strong and permanent magnets; a popular one is neodymium. College Physics for AP Courses 2015-08-12T00:00:00Z The European Union, Britain and the United States are scrambling to build domestic rare earth and magnet industries to wean themselves off China, which supplies 98% of permanent magnets to Europe. EV parts maker Schaeffler signs first of a kind European rare earth deal 2022-04-19T04:00:00Z China controls up to 85% of the world’s rare earth oxides and about 90% of rare earth metals alloys, and permanent magnets, according to the Center for Strategic and International Studies. Biden calls for more domestic production of rare minerals, says U.S. cannot depend on China 2022-02-22T05:00:00Z The EU has targeted rare earths as a top priority because 98% of the bloc's permanent magnets, also vital for the defence sector, are imported from China. Blockchain rare earth scheme to certify sustainable output for EVs 2022-02-07T05:00:00Z Most electric motors are powered by permanent magnets, sometimes no larger than a pack of playing cards, that are made of rare earth metals. BMW’s iX M60 is a dual-motor performance EV with 280 miles of range 2022-01-04T05:00:00Z The strongest permanent magnets have fields near 2 T; superconducting electromagnets may attain 10 T or more. College Physics for AP Courses 2015-08-12T00:00:00Z Schaeffler, which also has an industrial division, wants to lock in supply of permanent magnets to support its plan to be a major global supplier of electric drivetrains to the fast-growing EV industry. EV parts maker Schaeffler signs first of a kind European rare earth deal 2022-04-19T04:00:00Z Electric motors are powered by permanent magnets, sometimes no larger than a pack of playing cards, that are made of rare earth metals. General Motors makes moves to source rare earth metals for EV motors in North America 2021-12-09T05:00:00Z A government-funded feasibility study is due to be published on Friday, laying out the steps Britain must take to restart output of rare earth permanent magnets, the sources said. EXCLUSIVE UK gears up to produce rare earth magnets, cut reliance on China 2021-11-04T04:00:00Z “I believe we are in a similar situation with rare earths and permanent magnets as we were a few years ago with batteries and lithium,” he said at the time. Exclusive-EU considers help for rare earth magnet production - sources 2021-08-23T04:00:00Z Domains can grow and align on a larger scale, producing permanent magnets. College Physics for AP Courses 2015-08-12T00:00:00Z Motors without permanent magnets, such as induction motors, use electric current, often with copper wiring, to create a magnetic field and power the motor. Factbox: Automakers cutting back on rare earth magnets 2021-07-19T04:00:00Z But he said permanent magnet motors will still dominate, mainly because of their power and efficiency. China frictions steer electric automakers away from rare earth magnets 2021-07-19T04:00:00Z LCM is one of the only companies outside of China that transforms rare earth raw materials into the special compounds needed to produce permanent magnets. EXCLUSIVE UK gears up to produce rare earth magnets, cut reliance on China 2021-11-04T04:00:00Z Neo owns the only commercial rare earth separation facility in Europe and is prepared to build a $100 million permanent magnet factory in Estonia, Karayannopoulos added. Exclusive-EU considers help for rare earth magnet production - sources 2021-08-23T04:00:00Z But instead of fashioning bizarrely shaped coils for the machine, Cowley envisions using conventional ones and adding high-strength permanent magnets on electronically adjustable mounts to shape the field. After decades of decline, the U.S. national fusion lab seeks a rebirth 2020-02-06T05:00:00Z The world's biggest EV maker initially used induction motors without rare earth permanent magnets, but in 2017 it released its Model 3 with a permanent magnet motor. Factbox: Automakers cutting back on rare earth magnets 2021-07-19T04:00:00Z The permanent magnets in hybrid and EV motors cost more than $300 per vehicle or up to half the cost of the motor, analysts say. China frictions steer electric automakers away from rare earth magnets 2021-07-19T04:00:00Z Each actuator comprises two connected parts: a coil of copper wire sealed in an acrylic base, and a permanent magnet mounted on a polymer beam. Virtual and augmented reality enhanced by touch 2019-11-19T05:00:00Z China also aims to use the minerals to produce its own versions of permanent magnets and electric vehicles. The hidden costs of China's rare-earth trade 2019-07-29T04:00:00Z Department of Defense’s purchases of rare earth permanent magnets are “relatively minor” when compared to imports for electronic, automotive and other applications. China June rare earth magnet exports to U.S. fall 3.9% from May 2019-07-27T04:00:00Z VW is using permanent magnets with less of two rare earths, terbium and dysprosium. Factbox: Automakers cutting back on rare earth magnets 2021-07-19T04:00:00Z The induction motor provides more power, while the one with permanent magnets is more efficient, Tesla said: Including a rare earth motor boosted the models’ driving range by 10%. China frictions steer electric automakers away from rare earth magnets 2021-07-19T04:00:00Z The beige droplets react strongly to a spinning magnetic field—as a permanent magnet should—whereas the red and green droplets do not. Watch Liquid-Based Magnet Droplets Twirl and Morph 2019-07-23T04:00:00Z For example, rare earth elements such as neodymium and dysprosium are frequently combined in permanent magnets. Don't Panic About Rare Earth Elements 2019-05-31T04:00:00Z For example, rare-earth permanent magnets are used in miniature motors or generators in many, now ubiquitous, technologies. China gears up to weaponize rare earths in trade war as summit approaches 2019-05-29T04:00:00Z This electromagnetic force is generated using a coil of wire surrounded by permanent magnets. Why we’re killing the kilogram for a new one 2018-11-13T05:00:00Z Like other hybrid vehicles, this is what the Prius uses, though it calls them synchronous AC permanent magnet motors. Do electric cars dream of software fixes? 2018-04-22T04:00:00Z Unlike the DC motors of the time, Tesla’s motors didn’t create sparks or require expensive permanent magnets to operate. Why Elon Musk named his electric car Tesla 2017-12-31T05:00:00Z Unlike the D.C. motors of the time, Tesla’s motors didn’t create sparks or require expensive permanent magnets to operate. Tesla the Car Is a Household Name. Long Ago, So Was Nikola Tesla. 2017-12-30T05:00:00Z That turns them into an electromagnet, generating a magnetic field which pushes against an existing field generated by a second set of permanent magnets inside the stator. As electric motors improve, more things are being electrified 2017-09-14T04:00:00Z Each of the two engines consists of a DC/DC converter to increase the voltage from the batteries, and a permanent magnet motor drive to transform the electrical signal into mechanical energy. Finland's oldest operating ferry given electric motor - BBC News 2017-04-28T04:00:00Z On Monday, Hyperloop Transportation said it created a way to elevate hyperloop pods using permanent magnets, a new technique that is cheaper and conserves more energy than previous methods. Hyperloop One Accelerates Towards Future With High-Speed Test 2016-05-11T04:00:00Z Moving a permanent magnet near a loop of wire will cause a current to flow in the wire, as English physicist Michael Faraday discovered in 1831. Hyperloop Transportation says it will use a ‘cheaper, safer’ form of magnetic levitation 2016-05-09T04:00:00Z General Atomics Aeronautical Systems Inc., maker of the U.S. military’s Predator drones, built a 450-foot maglev track in San Diego using permanent magnets 10,000 times as strong as refrigerator magnets. Hyperloop Race Picks Up Speed 2016-01-22T05:00:00Z A reluctance motor eliminates the permanent magnets as well as the brushes. As electric motors improve, more things are being electrified 2017-09-14T04:00:00Z For many years headphone receivers were the simple "Bell" type with permanent magnet, coil and diaphragm. The 19th Century plug that's still being used - BBC News 2016-01-10T05:00:00Z Do this in the presence of permanent magnets and a coil of wire, such as are found in conventional generators, and it will generate electricity. Waving good buy? 2015-11-05T05:00:00Z Passive magnetic levitation, which was developed by the late physicist Richard Post in 2000, uses unpowered loops of wire in the track and permanent magnets in the train pod to create levitation. Hyperloop Transportation says it will use a ‘cheaper, safer’ form of magnetic levitation 2016-05-09T04:00:00Z The skate park spans 200 meters and was constructed using permanent magnets. Levitating magnetic hoverboard unveiled - BBC News 2015-08-05T04:00:00Z In newer motors the usual order of things is reversed, with the windings held in the stator and the rotor sporting permanent magnets. As electric motors improve, more things are being electrified 2017-09-14T04:00:00Z Most fluorescent lights contain europium, yttrium and terbium, for example, and strong permanent magnets typically contain neodymium and dysprosium. Chemistry: Degrees of separation 2015-04-21T04:00:00Z Alien-sounding elements such as yttrium, neodymium, europium, terbium and dysprosium are key components of energy-saving lights, powerful permanent magnets and other technologies. Green Technology Depends on Metals with Weird Names 2013-12-26T13:15:04.236Z The Lexus Future Concept Coupe features both a petrol engine and a water-cooled permanent magnet electric motor. In pictures: 2013 Shanghai Auto Show 2013-04-23T16:17:48Z Once in the on position, they don’t require additional energy, since the permanent magnet is doing the work. A Tiny Transforming Robot Inspired by Protein (and Junkyard Magnets) 2012-12-05T18:25:18Z The permanent magnets can be improved, too, by making them from strongly magnetic rare-earth materials such as dysprosium and neodymium. As electric motors improve, more things are being electrified 2017-09-14T04:00:00Z The main practical difference between a reluctance motor and a normal one is that the reluctance motor has no permanent magnets. Electric motors: Reluctant heroes 2012-11-15T16:05:22Z As the air rushes across the carbon-fiber wing, the rotors generate electricity by spinning permanent magnets. High-Tech Kites Harvest the Power in Sea Breezes (preview) 2012-09-24T11:15:13.397Z However, these generators currently use permanent magnets based on rare-earth materials such as neodymium and dysprosium for their high remnant fields, field anisotropy and high-temperature stability. Opportunities and challenges for a sustainable energy future 2012-08-15T17:21:52.727Z Bob Wolf, head of sales at magnet supplier Alliance LLC, counts more than 100 permanent magnet applications in a modern car. Analysis: Search for rare earth substitutes gathers pace 2012-06-22T15:49:04Z V and W are two strong permanent magnets provided with armatures V' W', respectively. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The stator usually forms the casing and houses a set of permanent magnets. Electric motors: Reluctant heroes 2012-11-15T16:05:22Z We use heavy duty circuit boards and permanent magnets rather than wire windings and iron laminations used in conventional motors. Outdoor Power Equipment Goes Gas-Free: Makes Way To Wind Energy 2012-02-09T23:15:47Z The simplest arrangement for this purpose is a powerful permanent magnet so placed that its inter-polar field embraces the contact points and is at right angles to them. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z GM is looking at reducing its overall use of rare earths by eventually replacing permanent magnet motors, but that will take time, said Yucong Wang, manager of GM's Department of Materials Technology. Analysis: Search for rare earth substitutes gathers pace 2012-06-22T15:49:04Z Its magnetic field is obtained from permanent magnets, hence the electromotive force generated is comparatively small. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z But unlike a normal motor it has no need of permanent magnets, rare-earth or otherwise, for it works on a different principle: least magnetic reluctance. Electric motors: Reluctant heroes 2012-11-15T16:05:22Z Any material that will retain its magnetic influence after removal from the source of magnetism is known as a permanent magnet. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z In place of the alternating current, Mr. Brown finds that a revolving permanent magnet can be used to produce the alternating magnetisation of the pole pieces of the sensitive tube or coherer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Japanese media reports say Toyota Motor Corp has found a way to make electric cars without rare earths, while Renault SA has started producing cars with electric motors that do not need permanent magnets. Analysis: Search for rare earth substitutes gathers pace 2012-06-22T15:49:04Z These are known as permanent magnets in distinction from electromagnets. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z That reverses the polarity of the electromagnets and causes the rotor to be pulled around by attraction and repulsion between the electromagnets and the permanent magnets. Electric motors: Reluctant heroes 2012-11-15T16:05:22Z Steel is used in all cases where permanent magnets are required, while soft iron is employed in all cases where an intermittent magnetic action is desired. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z The added power was obtained by turning the instrument inside out, as it were, making the coil the moving part and the permanent magnet the fixed part. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z "We think that their technology will accelerate the uptake of the permanent magnet generator," Jackson said. Analysis: Search for rare earth substitutes gathers pace 2012-06-22T15:49:04Z A solenoid has north and south poles, and in fact possesses all the properties of an ordinary permanent magnet, with the important difference that the magnetism is entirely under control. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Cover the permanent magnet with the cardboard or paper. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z “Everybody is going back to the drawing board and trying to redesign their generators to minimize the usage of permanent magnets,” said Steve Duclos, chief scientist and manager of material sustainability for GE Global Research. Rare Earths Fall as Toyota Develops Alternatives: Commodities 2011-09-29T02:26:16Z This enabled him to employ a very powerful permanent magnet in place of the minute one made of watch-spring. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z In this Movable coil galvanometer. instrument a permanent magnet, generally of the horseshoe shape, is employed to create a strong magnetic field, in which a light movable coil is suspended. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The creation of permanent magnets, a key component in so many green technologies, is one of the key uses of rare earths. Precious scarcity 2011-07-12T00:23:48Z What material is needed for a permanent magnet? Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z If a piece of hard steel is treated in the same way it becomes a permanent magnet. Autobiography of an Electron Wherein the Scientific Ideas of the Present Time Are Explained in an Interesting and Novel Fashion 2011-06-19T02:00:25.633Z The AMS consists of a powerful permanent magnet surrounded by a suite of particle detectors. Antiuniverse here we come 2011-05-04T17:20:30.963Z One of the effects which electricity can be made to produce is the magnetising of steel bars to form the ordinary and well-known permanent magnets which are used in ships’ compasses, &c. Wrinkles in Electric Lighting 2011-01-22T03:00:17.277Z The weaker field of the permanent magnet, Dr. Ting said, would be more than offset by the longer time the equipment would be aloft and a slight redesign of the particle tracking arrays. A Costly Quest for the Dark Heart of the Cosmos 2010-11-17T11:38:00Z Pass the coil back and forth close to the end of a permanent magnet. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z In 1982, Mountain Pass Mine began processing samarium oxide and in 1989, it began processing neodymium oxide, both critical components of two types of permanent magnets. The rare earth element big squeeze 2010-08-30T21:47:00Z In the case of permanent magnets it is also important for preserving their magnetism when not in use, and hence it is sometimes termed the keeper. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Also, if a permanent magnet be suspended so as to give out a musical sound when it is struck, the magnetism will be much weakened by making it thus to vibrate. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action The simplest is to let the current, or part of it, flow through a coil which is pivoted between the N and S poles of a strong permanent magnet. Letters of a Radio-Engineer to His Son This ink ... can be rendered magnetic by means of a permanent magnet. Development of the Phonograph at Alexander Graham Bell's Volta Laboratory Contributions from the Museum of History and Technology, United States National Museum Bulletin 218, Paper 5, (pages 69-79) The diamagnetic quality of this metal can be detected by means of a good permanent magnet, and its repulsion by a magnetic pole had been more than once recognized before the date of Faraday's experiments. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" The term is also applied to the core and coil of the electro-magnet, which revolves before the poles of the permanent magnet in the magneto-electric machine. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli In one case a permanent magnet is thrust into a coil of wire, and in the other a piece of iron is made a magnet while enclosed in a coil. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action Soft iron does not make a good permanent magnet. Letters of a Radio-Engineer to His Son The desired action is secured by a combination of a permanent magnet and an electromagnet which is connected to the alternating current supply. The Automobile Storage Battery Its Care And Repair He constructed a telephone in which a rod of soft iron, about six feet in length, was used instead of a permanent magnet. Little Masterpieces of Science: Invention and Discovery What is electricity?—Forms of electricity—Magnetism—The permanent magnet—Lines of force—Electro-magnets—The electric bell—The induction coil—The condenser—Transformation of current—Uses of the induction coil. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use The power of the electro-magnet is enormously greater than that of any permanent magnet. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action Look, we make a roller bearing, this shape only it's a permanent magnet. Junior Achievement Hard steel retains a great deal, and for this reason steel is used for permanent magnets, of the horseshoe type so familiar. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine What is the continuing and ever-acting cause which makes all planetary bodies, including the sun, their centre, to be permanent magnets? Aether and Gravitation The coil poles therefore try to seek the contrary poles of the permanent magnet, and the coil revolves until its S. pole faces the N. of the magnet, and vice versâ. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Moreover, if a permanent magnet be heated to a red heat, its magnetism is destroyed; for such a heat allows the molecules to freely arrange themselves without any external constraint. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action But the iron is incapable of becoming a permanent magnet. Fragments of science, V. 1-2 The removal of magnetism from a permanent magnet, or a horse-shoe magnet, for instance. Electricity for Boys That is to say, we shall have such phenomena as magnetic fields, magnetic lines of force, magnetic induction, and the production of permanent magnets by electricity. Aether and Gravitation In a central hole of an ebonite casing is fixed a permanent magnet, M. The casing expands at one end to accommodate a coil of insulated wire wound about one extremity of a magnet. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use A permanent magnet is one in which the electricity resides, or remains, as it does in the earth. The Wonder Island Boys: The Mysteries of the Caverns Such kinds of steel are most suited to the formation of permanent magnets. Fragments of science, V. 1-2 A permanent magnet and a revolving armature for generating a current. Electricity for Boys In fact, the reason why steel becomes a permanent magnet is not at all understood. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel The telephone, in its present form, consists of a powerful compound permanent magnet, to the poles of which are attached ordinary telegraph coils of insulated wire. Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. When that is done the same thing is done to the bar as the bar of the permanent magnet exhibits. The Wonder Island Boys: The Mysteries of the Caverns It is manifest, indeed, that without coercive force a permanent magnet would not be at all possible. Fragments of science, V. 1-2 The term applied to the force located near the north pole of the globe, to which a permanent magnet will point if allowed to swing freely. Electricity for Boys The electro-magnets are magnetized by a local battery; permanent magnets might, however, take their place with a gain in simplicity. Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures Between the poles of the magnets, M and M', there is a permanent magnet, A, movable around a vertical axis, i. Scientific American Supplement, No. 508, September 26, 1885 "Then as we want to make a permanent magnet, must we harden both of the bars?" The Wonder Island Boys: The Mysteries of the Caverns In its construction he falls back upon the principle of the magneto-electric machine, employing permanent magnets as the exciters of the induced currents. Fragments of science, V. 1-2 Permanent Magnets.—A permanent magnet is a piece of steel in which an electric force is exerted at all times. Electricity for Boys There are bodies which are natural magnets, and they are called permanent magnets. A Catechism of Familiar Things; Their History, and the Events Which Led to Their Discovery. With a Short Explanation of Some of the Principal Natural Phenomena. For the Use of Schools and Families. Enlarged and Revised Edition. When a current is sent through the coil, the coil becomes a magnet and turns so that its faces will be towards the poles of the permanent magnet. General Science In all the earlier machines permanent magnets of steel were used. Notable Events of the Nineteenth Century Great Deeds of Men and Nations and the Progress of the World If, now, such an electromagnet, a permanent magnet, and a pivoted armature be related to a pair of gongs as shown in Fig. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Direct-Current Dynamo.—We shall now make the simplest form of dynamo, using for this purpose a pair of permanent magnets p. Electricity for Boys To obtain a substance that will retain the power induced, we must make some other election; and hard steel is most serviceable for conversion into a permanent magnet. Lectures on Popular and Scientific Subjects Now I want particularly to ask you to guard against the idea that all these results obtained from electromagnets are equally applicable to permanent magnets of steel; they are not, for this simple reason. Scientific American Supplement, No. 787, January 31, 1891 These could be made much more strongly magnetic than the permanent magnets. Notable Events of the Nineteenth Century Great Deeds of Men and Nations and the Progress of the World Make sketch of Bell's original magneto telephone without permanent magnets. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The batteries were placed in the central portion of a very powerful magnetic field, and after they have been taken out they formed perfectly regular permanent magnets. Scientific American Supplement, No. 455, September 20, 1884 It is changed into a temporary magnet in the mere presence of a permanent magnet, and as long as you leave the two side by side they are both magnets alike. The World's Great Sermons, Volume 10 Drummond to Jowett, and General Index If the direction of flow of current be reversed, by reversing the battery, the electromagnetic polarity also reverses and the end of the permanent magnet swings over to the other side. Edison, His Life and Inventions This ribbon type microphone had a very large and heavy permanent magnet embodied in the design and must have weighed about 1,000 times more than a modern electret lapel microphone. The Dawn of Amateur Radio in the U.K. and Greece: a personal view The armature is in contact with one pole of the permanent magnet and nearly in contact with the other. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The apparatus needed is simply a good compound horseshoe permanent magnet, 15 centimeters long, having six or more plates, giving it a total thickness of at least 3 centimeters. Scientific American Supplement, No. 392, July 7, 1883 The permanent magnet will quickly lose its power of attraction under the combined action of the heat and the jarring to which it will be subjected. Oxy-Acetylene Welding and Cutting Electric, Forge and Thermit Welding together with related methods and materials used in metal working and the oxygen process for removal of carbon The ordinary, permanent magnet, natural or artificial, has little place in the arts. Steam, Steel and Electricity Both transmitter and receiver consist of a permanent magnet of hardened steel around one end of which is placed a coil of insulated wire. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents A permanent magnet will impart temporary magnetism to pieces of iron near it. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. An electromagnet is used instead of a permanent magnet and this is energized by a 6-volt storage battery as shown in the wiring diagram at A in Fig. The Radio Amateur's Hand Book When we take a piece of soft iron and continuously revolve it in front of a permanent magnet, the magnetic poles of the soft iron piece will keep changing their position at each half revolution. Marvels of Modern Science The time came, led to by the improvement of Wilde, in which those steel permanent magnets were no longer used. Steam, Steel and Electricity But if the magnet be made to attract a piece of hardened steel, the latter will retain the magnetism produced in it and become itself a permanent magnet. Side-Lights on Astronomy and Kindred Fields of Popular Science The ends of these pieces which are nearest to the permanent magnet 1 are of the opposite polarity to the end they approach, the free ends being of opposite polarity. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. He next operated with the powerful permanent magnet of the Royal Society, and obtained with it, in an exalted degree, all the foregoing phenomena. Faraday as a Discoverer This band is kept passing in front of a permanent magnet, the magnetism of the wire tending to change as it passes from one pole to the other. Marvels of Modern Science Other types of generators having two, three, or four permanent magnets instead of five, as shown in this figure, are also standard. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The method commonly employed of associating the pole pieces with each other and with the permanent magnets is shown in Fig. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Similarly, a variation of the electromotive forces in the windings varies the pull of the permanent magnet of the receiving instrument upon its diaphragm. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Instead of developing the necessary magnetic field by means of electromagnets, as in the case of the ordinary dynamo, the field of the magneto generator is developed by permanent magnets, usually of the horseshoe form. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. In order that the armature and cores may be normally polarized, a permanent magnet 6 is secured to the center of the yoke piece 1. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. At their lower ends, these two permanent magnets are clamped against the soft iron pole pieces 6-6, a threaded block 7 also being clamped rigidly between these pole pieces at this point. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The most noticeable thing about the construction of this receiver is the absence of permanent magnets. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A permanent magnet so related to iron forms part of a polarized ringer. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The construction in this case is not unlike that of an ordinary permanent-magnet receiver, except that in the place of the permanent magnets two soft iron cores 1-1 are employed. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This field is usually provided by a permanent magnet, hence the name "magneto-generator." Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The permanent magnet was of laminated construction, consisting of four hard steel bars 1, extending nearly the entire length of the receiver shell. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The coil of this receiver was wound on a round iron core 2, flattened at one end to afford means for attaching the permanent magnet. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. That depends Page 43 upon the strength of the permanent magnet. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Until about the middle of the year 1909, it was the universal practice to employ permanent magnets for giving the initial polarization to the magnet cores of telephone receivers. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. |
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