January 25, 2021 in Uncategorized
Not all Strong Neodymium Magnets consist of a solid piece of ferromagnetic material. Some of them are made of wire coils. Known as electromagnets, they use electricity to generate a magnetic field. As electricity flows through the wire coils, it becomes magnetized. When the electricity stops flowing through the wire coils, it loses its magnetic field. Below are five fun facts about electromagnets and how they work.
Electromagnets are controllable. This is one of the features that distinguish them from traditional, solid magnets. Other magnets generate a permanent magnetic field. The magnetic field is generated by the ferromagnetic material of which they are comprised. Electromagnets are different because they only generate a magnetic field when electricity flows through the wire coils. By disrupting the flow of electricity through the wire coils, the magnetic field can be disabled.
2) Discovered In the 19th Century
Electromagnets were first discovered in the 19th century by Danish scientist and researcher Hands Christian Orsted. Orsted found that electricity, when ran through wire coils, produces a magnetic field. About a decade later, a British scientist named William Sturgeon built an electromagnetic out of copper wire. Sturgeon applied a voltage to the coiled copper wire, resulting in the production of a magnetic field.
3) Adjustable Power Level
Another unique feature of electromagnets is an adjustable power level. The power of their magnetic field can be adjusted by increasing or decreasing the amount of electricity flowing through the wire coils. The more electricity that flows through the wire coils, the stronger the magnetic field will be. Permanent magnets don’t offer an adjustable power level. They produce the same, consistent magnetic field at all times.
4) Used in MRI Machines
A common application for electromagnetics is magnetic resonance imaging (MRI) machines. MRI machines are medical imaging devices that are used to diagnose injuries and illnesses in people. Most MRI machines rely on superconducting electromagnets to perform this task. They feature a large coil that’s cooled with helium. The electromagnets in MRI machines are so, strong, in fact, that can typically lift a vehicle. This is why patients are required to remove all jewelry before entering an MRI machine.
5) Used in Generator
In addition to MRI machines, electromagnets are commonly used in generators. Wind and hydro generators, for instance, typically generate energy through induction. They feature a coil of wire that spins between two magnets and Ndfeb Magnet Price. As the wire coil spins, electricity is generated.
January 11, 2021 in Uncategorized
What is a magnetic field?
A magnetic field is quite simply the area around a Ring Neodymium Magnet in which its magnetism can affect other objects. If you were to be able to see a magnetic field, you would see lines called lines of flux that show the direction of a magnet’s force or field.
So what is gauss?
Gauss is a term used to refer to the flux density, or number of lines of flux measured per square centimeter. The magnetic field strength generally refers to the total flux available in an area of interest. This is foremost determined by the magnetic material used in manufacturing the body or cake of the magnet. For example, we hear the term MGOe (Mega Gauss Oersteds) when describing magnetic material used to manufacture magnets. Each different MGOe level will have a maximum strength the material can be magnetized to. Currently 52 MGOe is the strongest material available. A magnet will only generate a finite amount of flux, depending on the style or geometry, size and material used. For this reason, when we design a magnet, we design it to use the available flux in the most efficient manner to accomplish the desired results.
What is the pull value?
In some industry terms, it is the amount of force that is required to remove a magnet away from a flat piece of iron. However, varying grades of iron make this test inconsistent and it is impossible to conduct in the field with many styles of separation equipment.
In our industry when we refer to the pull value of the magnet, we are referring to the amount of force (in pounds of pull) that is required to remove, or pull a certain size piece of metal away from the surface of the magnet. You can also understand this as “hold value.” The larger the piece of metal used to test a magnet, the higher the pull value will be. We typically conduct pull tests with either a ½” ferrous ball or a ¼” ferrous ball. Varying degrees of pull value can be seen from manufacturer to manufacturer utilizing the same level MGOe material, based upon the magnet design and purpose. However, this usually is accomplished by utilizing a much thinner protective sleeve covering the magnet reducing the air gap, or distance between the magnetic material and the surface of the protective sleeve. It should be noted that when this is done, it reduces the durability and possibly the longevity of the magnet.
What is Air Gap?
Air gap is the distance between the actual body of the magnet and the outer surface of its protective cover that your product will flow across. Air gap drastically changes the gauss level and pull value of the magnetic field. Simply stated, the further away from the magnet, the less strength of the magnetic field.
Don’t I always want the minimum amount of Air Gap possible to increase the magnet strength when choosing a magnetic separator?
Not necessarily. If your product you are processing is abrasive or you are experiencing large tramp metal at high processing rates, you will want to weigh the cost of replacing the magnetic separator pre-maturely versus the actual strength necessary to retain the tramp metal you are looking to remove with the separator. When using a thicker protective cover, you can increase the longevity of your magnet while maintaining adequate magnetic field strength and holding value to provide effective tramp metal separation.
Another way some manufacturers decrease their air gap, therefore increase their gauss levels and holding value is to eliminate the protective coating on Neodymium magnetic material. Neodymium is very vulnerable to oxidation. Corrosion causes the magnet to crumble into a powder, losing the magnetic field and possibly causing premature replacement of the magnet.
So what is most important, magnetic field, gauss or pull value?
That is a great question and not one that is easily answered. Each application is unique and requires different considerations when choosing the correct separator for you. To be effective in cleaning your process of tramp metal, we need to consider two very simple things:
First, how close to the magnet does a piece of tramp need to get for the magnetic field to attract it to the surface of the magnet; we call this reach out.
Secondly, we need to understand how tightly we will need to hang on to the piece of metal before it releases it back into your product stream; we call this pull value or holding force. If a magnet is designed with maximum gauss strength at the surface of the magnet but is lacking in the magnetic field reach out, then it will not matter how much gauss or holding force the magnet has because tramp metal will not be drawn to the surface of the magnet to begin with. Likewise, if your magnetic field is adequately strong to reach out and pull your tramp metal to the surface of the magnet, and your magnet is lacking in holding value, then the tramp you have captured simply washes back off into your product stream.
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December 14, 2020 in Uncategorized
Cold weather is great for enjoying hot cocoa by a fireplace, college football, and white Christmases. But what does it do to magnets and does the temperature of a Ring Neodymium Magnet affect its strength?
As it turns out most magnets don’t mind the cold. In fact, some may perform better when the temperature drops. That’s because the atoms that comprise magnets vibrate more slowly and less randomly when cold. The result is a better alignment of the atoms that generates the magnetic field, boosting its strength.
It won’t be a dramatic difference, but if you’re curious you can monitor the change with a simple experiment.
First, check field strength at room temperature by dropping a neodymium bar magnet into a bowl of paper clips, and counting how many become attached. Then fill the bowl with water and put it in the freezer until the temperature of the water falls near freezing (32°F). Drop the magnet into the water and put the bowl back in the freezer for 15 minutes. Remove the bowl from the freezer just before the water freezes. Then pull the magnet from the bowl and count the number of attached paper clips. Compare this number to the number at room temperature. If you like, you can try the experiment again with dry ice that will further lower the temperature to -108°F (-78°C). (Use caution when handling dry ice and objects cooled by it).
Will the magnetic field continue to strengthen the colder it gets?
For neodymium magnets, it will not. Once you move into extremely frigid conditions (below -135°C), the field will begin to diminish. With neodymium magnets, field strength will decrease by 85-90% at the boiling point of liquid nitrogen (196°C). This is caused by the molecules in the magnet falling out of the good alignment seen at lesser temperature drops. However, when the temperature rises, the magnet will return to normal performance. The change in magnetic output is reversible, that is, no permanent loss of magnetic strength occurs.
We’ve used neodymium magnets as an example, but cold-temperature performance would be similar for Samarium Cobalt and for Alnico magnets. Ceramic magnets are the only magnet type where extreme cold would be cause for concern. If your SmCo Ring Magnets application entails exposure to temperatures below -60°C, it may result in a permanent (irreversible) loss of magnetic strength.
November 30, 2020 in Uncategorized
Magnets produce magnetic fields, or areas in which potentially magnetic materials, such as iron, are polarized and attracted to the magnet. There are two types of magnets: permanent magnets and electromagnets. Permanent magnets have a constant magnetic field, while electromagnets only produce a field when an electric current runs through the coil that comprises part of their structure. Ring Neodymium Magnet are permanent magnets that are distinguished by their shape: they are round with a hole in the middle, and because of this shape they are sometimes referred to as donut magnets.
A variety of materials are used to create permanent magnets. Often, they are made of one of a group of materials called rare earth, which are mixtures of elements — usually neodymium, iron and boron or samarium and cobalt. Alnico magnets are mixtures of aluminum, nickel and cobalt. There are also weaker magnets that are made of magnetic materials, like iron oxide, mixed with nonmagnetic materials, such as plastic or ceramics. The magnetic elements produce the field, while the nonmagnetic elements give the magnet shape.
These materials are not naturally magnetic, however — they simply have magnetic potential. In the factories where they are made, workers first form the material into the desired shape, and they may coat the magnet to make it more colorful. Then, they pass the object through a strong electromagnet, which induces magnetic properties in the object that remain even after the electromagnet is turned off. If the electromagnet is strong enough, this process creates a permanent magnet.
The process of magnetization creates poles on the magnet that are labeled north and south, and each repels similar poles and attracts opposite poles. The location of the north and south parts of ring magnets depends on the way they are polarized; one half is always north and one half is south. Sometimes, the magnet is divided so that one side of the ring is north and the other is south, but different kinds of polarization can create magnets that are split into quarters or eighths. North and south segments always alternate around the ring.
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SmCo Ring Magnets are most commonly used in science experiments, although they also have medical applications. Some people have implantable cardioverter-defibrillators, or ICDs, that automatically apply shocks to their hearts if the rhythm develops irregularities. If the devices malfunction, they can shock the patients unnecessarily, leading to irregular rhythms and possibly death. Medical personnel sometimes place these magnets on patients’ chests over the ICDs to disable the devices.
November 23, 2020 in Uncategorized
Printing direct to Strong Neodymium Magnets is a cost-effective method of creating high impact vehicle graphics, P.O.P. displays, calendars and other ad specialty items, portraits, decorative magnets, message boards, photos, way finding signs, temporary signage, and more. Achieving quality results from your printer and magnetic sheeting is essential for the success of every project.
Magnetic sheeting is considered a semi-rigid substrate, and, like all semi-rigid substrates, takes a little know-how to produce the best quality product. Here are some tips for printing direct to magnet.
First, when determining magnetic sheeting compatibility, look to see what type of material to use with your printer. Printer compatibility largely depends on the type of ink used. PrintMagnetVinyl™ is a flexible magnetic sheeting with a vinyl coating used with wide-format solvent, eco-solvent, UV and latex printers. Magnetic receptive material, FlexIRON™ , is also compatible with these same printer types.
For printers using aqueous inks, select PrintMagnet™ with a paper topcoat as the compatible option for flexible magnetic sheeting and FlexIRON™ (PP) for a magnetic receptive choice.
Refer to the table for a quick reference of the ink and magnetic sheeting compatibility.
Beyond the ink compatibility, we’ve worked with most major printers to test for quality and compatibility with PrintMagnetVinyl™ and FlexIRON™. Find a list of printers and more information here.
Use Influences Choice
After understanding the type of magnetic sheeting compatible with your printer, the next factor in selecting material is determining where and how it will be used.
Major influencing factors include:
Indoor or outdoor use
Size of project
The thicker the magnetic sheeting means the stronger the sheeting. However, that isn’t always the best way to select the thickness needed for your project. Traditionally vehicle magnets need the strength of 30-mil to adhere securely during high speeds. But promotional items like magnetic calendars only need 15-mil.
Projects designed to withstand the outdoor elements of sun, wind and rain clearly require vinyl sheeting for outdoor use. Alternatively, if printing with aqueous ink on a paper topcoat, laminating the project provides protection from the element. However, items designed to be used exclusively indoors, like magnetic business cards or P.O.P. signage, simply need material for indoor use.
Also, considering the size and scope of your project prior to deciding on the width of material can potentially save you time and Ndfeb Magnet Price
November 16, 2020 in Uncategorized
Many of you may ask yourself: Why are neodymium magnets super magnets? And: Are cheap ferrite magnets enough for my project? The special NdFeB combination (neodymium iron boron) has high adhesion even in small magnets. Therefore, ferrite magnets of the same size are much weaker. If you need small, light magnets or large, Strong Neodymium Magnets, we recommend buying super magnets. Neodymium magnets are a bit more expensive than ordinary ferrite magnets because neodymium is a rare earth metal. This is why super magnets are also called rare earth magnets. In the following situations, we recommend using ferrite magnets:
For outdoor use, we also carry some rubber super magnets. In our online shop: self-adhesive neodymium magnet e. G. Used as clasps for paper and cardboard products, name tags and clasps for handicrafts.
Some “strong” facts about our super magnets:
The strongest ring magnet: ideal for “fishing” ferromagnetic objects. For example, it will easily pull your bike out of the river.
What we call “death magnet”: a compact block magnet with an adhesion of 100 kg.
November 10, 2020 in Uncategorized
N52 Rare Earth Magnets are actually permanent magnets because they lose their magnetism or are naturally demagnetized, about 1% per century. They usually operate in a temperature range of -215°F to 176°F (-138°C to 80°C). For applications requiring a wider temperature range, Sa cobalt (SmCo) magnets are used.
Since uncoated sintered N52 Rare Earth Magnets will corrode and chip when exposed to the atmosphere, they will be sold with a protective coating. The most common coating is made of nickel, although other commercially available coatings are also resistant to high temperatures, high humidity, salt spray, solvents and gases.
N52 Rare Earth Magnets have different grades, corresponding to their magnetic field strength, ranging from N35 (the weakest and cheapest) to N52 (the strongest, most expensive and more brittle). The N52 magnet is about 50% stronger than the N35 magnet (52/35 = 1.49). In the United States, consumer-grade magnets in the range of N40 to N42 are usually found. In mass production, if size and weight are not the main considerations, N35 is usually used because it is cheap. If size and weight are key factors, a higher grade is usually used. The price of the highest grade magnets has a premium, so compared with N52, it is more common to use N48 and N50 magnets in production.