Anti-shoplifting Devices Electromagnets
Anti-shoplifting Devices Electromagnets Anti-shoplifting Devices Each year, businesses lose billions to shoplifting. To prevent this, most stores have invested in security. Common systems include electronic surveilance, security personel, and alarm systems. One of these systems, called the EM system, uses electromagnets to thwart shoplifters. Electromagnetic (EM) System The EM system, dominant in Europe, uses electromagnetic fields to prevent shoplifting. There are two parts to the system: the actual hardware (often placed at the exit of the store), and the tags on the merchandise. In a store using the EM system, everything is affixed with a small tag. Inside the tag is a ribbon or thin piece of metal, which allows magnetic force to travel through it easily. At the exit, there are two components of the scanner system, a transmitter and a receiver. The transmitter [...]
Permanent electromagnets
Permanent electromagnets have a permanent magnetic field, but when supplied with power, the magnetic field is neutralized. This type of electromagnets is used when the magnetic field is required to work permanent electromagnets(magnetic field on) most of the time, and neutralized once in a while (for example a door lock). If the magnetic field should be off for 50% of the time or more, we would recommend the use of a regular electromagnet. [fusion_builder_container hundred_percent="yes" overflow="visible"][fusion_builder_row][fusion_builder_column type="1_1" background_position="left top" background_color="" border_size="" border_color="" border_style="solid" spacing="yes" background_image="" background_repeat="no-repeat" padding="" margin_top="0px" margin_bottom="0px" class="" id="" animation_type="" animation_speed="0.3" animation_direction="left" hide_on_mobile="no" center_content="no" min_height="none"] Permanent electromagnets Custom permanent electromagnets can be designed and fitted to your company’s requirements. Our experts will be glad to help you and contribute their knowledge & experience, will advise and make sure that our customers will [...]
Hard Drives Electromagnets
Hard Drives Electromagnets Hard Drives Although we may not see them every day, hard drives do immensely important behind-the-scenes work. Hard drives store government files, weather reports, your emails, the pictures on your digital camera, and many other things. In fact, hard drives are the backbone of the Internet: almost everything you see online is being stored on a hard drive. Hard drives use magnetic recording to store information: much like a cassette tape. Magnetic Recording Hard drives store data using electromagnets. On the basic level, the hard drive consists of the platter and the actuator. The platter is a hard material that is ferromagnetic (able to be magnetized). This is where your files are stored. The actuator arm, the piece that writes the data, magnetizes certain parts of the platter, giving it a value [...]
Doorbells Electromagnets
Doorbells Electromagnets Doorbells Although almost every house has a doorbell, we rarely stop and think about how they work. At the basic level, a doorbell consists of an electromagnet that triggers some kind of noise (a buzzer, bell, or chime). When you press the button of a doorbell, you are completing the bell's circuit, activating the electromagnet. In this page, I will outline how certain kinds of doorbells work. Buzzer and Bell A buzzer doorbell revolves around a circuit consisting of an electromagnet, a metal arm, and a small metal piece. When you press the button, the circuit is closed, and the electromagnet turns on. This causes the arm to be attracted upward to the electromagnet. However, as soon as the arm moves, the circuit breaks, and it falls back down again (due to gravity), [...]
Maglev Train Electromagnets
Maglev Train Electromagnets Maglev trains (short for magnetic levitation trains) are modern trains that leverage electromagnets. These trains are faster, quieter, smoother, and more efficient than their wheeled counterparts. Maglev trains are common in many Asian and European countries, and are becoming popular in airports as well. Today's fastest Maglev train can speed along at 581 mph, about the speed of a commercial airplane. While Maglev trains with passengers travel much slower, they still can travel twice as fast as their wheeled counterparts. As Maglev trains become more and more efficient, they may rival airplanes for land travel.Maglev Train Electromagnets All Maglev trains rely on the attraction and repulsion of magnetic poles. There are two main systems in use today, the EMS and EDS systems. The EMS system is used mostly in Germany, while the [...]
Speaker Electromagnets
Speaker Electromagnets - Speakers Even if we don't realize it, speakers are all around us. Our TVs, cellphones, headphones, radios, and computers all use speakers of different types. Although there are many different sizes, shapes, prices, and sounds to speakers, they all use the same underlying system, which relies on electricity and magnetism. [fusion_builder_container hundred_percent="yes" overflow="visible"][fusion_builder_row][fusion_builder_column type="1_1" background_position="left top" background_color="" border_size="" border_color="" border_style="solid" spacing="yes" background_image="" background_repeat="no-repeat" padding="" margin_top="0px" margin_bottom="0px" class="" id="" animation_type="" animation_speed="0.3" animation_direction="left" hide_on_mobile="no" center_content="no" min_height="none"] Speaker Electromagnets How a Speaker Works On a basic level, a speaker is the opposite of a microphone. It takes an electric signal and transforms it into sound waves that humans can hear. However, the underlying technology is more complicated than this. There are three main parts of a speaker: the diaphragm, the voice coil, and the [...]
Electromagnets
electromagnets - When an electric current flows in a wire, it creates a magnetic field around the wire. This effect can be used to make an electromagnet. A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply. [fusion_builder_container hundred_percent="yes" overflow="visible"][fusion_builder_row][fusion_builder_column type="1_1" background_position="left top" background_color="" border_size="" border_color="" border_style="solid" spacing="yes" background_image="" background_repeat="no-repeat" padding="" margin_top="0px" margin_bottom="0px" class="" id="" animation_type="" animation_speed="0.3" animation_direction="left" hide_on_mobile="no" center_content="no" min_height="none"] electromagnet You can make an electromagnet stronger by doing these things: wrapping the coil around a piece of iron (such as an iron nail) adding more turns to the coil increasing the current flowing through the coil There is a limit to how much current can be passed safely through the wire because the resistance of the wire causes heating. Dr Yan makes [...]
Br Magnetic Question
Br Magnetic Question - The magnet I ordered has a Br spec of 12.4 kG - why is the flux density only measuring 3.0 kG? This is best explained through referencing the permanent magnet characteristic of permeance coefficient, which is strictly determined by geometry. In general, longer magnets have greater permeance coefficients. Additionally, a magnet with a higher permeance coefficient functions at a higher operating point. Now, imagine stretching a magnet so that its magnetic length is infinite. Per the previous few sentences, this would result in a magnet with the largest possible permeance coefficient and, consequently, the highest possible operating point. This is the only configuration where a magnet operates at Br. [fusion_builder_container hundred_percent="yes" overflow="visible"][fusion_builder_row][fusion_builder_column type="1_1" background_position="left top" background_color="" border_size="" border_color="" border_style="solid" spacing="yes" background_image="" background_repeat="no-repeat" padding="" margin_top="0px" margin_bottom="0px" class="" id="" animation_type="" animation_speed="0.3" animation_direction="left" hide_on_mobile="no" [...]
Neodymium Magnets Falling Slowly Through A Fat-Ass Copper Tube
Neodymium Magnets Falling Slowly Through A Fat-Ass Copper Tube - in Copper, Having A Great Time, How Do They Work?, I Play With Magnets On The Regular So There, Kool, Magnets, Metal, Neato, Physics, Slow, Slow Your Roll Magnet Where You Trying To Go In A Hurry?, Sorcery, That Is A NICE LOOKING PIECE OF PIPE YOU'VE GOT THERE Neodymium Magnets Copper Tube This is a video of a guy demonstrating Lenz's Law with neodymium magnets and a thick-ass copper tube. Why does the magnet fall so slowly? SCIENCE. Via Wikipedia because I suck at explaining things except 1) where babies come from and 2) RPG strategies. Eddy currents (also called Foucault currents) are electric currents induced within conductors by a changing magnetic field in the conductor. These circulating eddies of current have inductance and thus [...]
Why does a spherical magnet fall so slowly through an aluminum tube?
Why does a spherical magnet fall so slowly through an aluminum tube? Charles Platt presents a science demonstration involving magnets that will interest juggalos and non-juggalos alike. magnet aluminum tube To explain the perplexing phenomenon of why a spherical magnet falls so slowly through an aluminum tube, I must refer to the right-handed-corkscrew rule. magnet aluminum tube When I first encountered this rule at the age of 16, I found it very hard to believe. My physics teacher, Mr. Sills, explained it. He was a charming but eccentric vegan who fascinated his students by violating the norms of everyday dress. Because he eschewed all use of leather, he wore tennis shoes, which were mildly scandalous in middle-class British society in 1961. Worse still, because vinyl belts did not yet exist, he held up his trousers with old [...]
Could buckyballs make any metal into a magnet?
Could buckyballs make any metal into a magnet? A layer of carbon can bestow the powers of magnetism. Viviane Richter explains. In a feat of modern day alchemy, scientists have successfully turned non-magnetic metals into magnets. Oscar Cespedes at the University of Leeds and his team published their magnetic recipe in Nature in August. The key ingredient? A dusting of carbon. “This is a new way of making magnets – it opens up a new field!” says Naresh Dalal from Florida State University, who also researches magnetic materials. Magnets are crucial in the age of big data. We’ve generated almost as much data in the past two years as during all of human history. To generate and store it, devices such as smartphones and computer hard drives use tiny, powerful magnets that store data as [...]
Rare Earths
Rare Earth elements, largely unknown to the majority of the general public, have become national news in the past decade. The magnet industry has used samarium, neodymium, dysprosium and other rare earths for decades as they are a very important ingredient in magnet design. Many of these magnets have enabled new technologies and are also critical to green initiatives such as wind turbines and hybrid cars. HSMAG has a “mine to magnet” solution for its production of Neodymium and samarium cobalt magnets. We are the only supplier producing Neodymium and SmCo at three different locations: Lupfig, Switzerland, Rochester, NY and China. Most of the material produced in Lupfig stays in Europe. They also send SmCo block to Rochester, NY for fabrication into magnets for industrial and military use as the material is DFARS compliant. The [...]
