Up to 75% depend on China! U.S. no longer restricts imports of neodymium magnets On September 21, the United States announced that it would no longer restrict the import of neodymium magnets. Neodymium magnets are rare earth materials commonly used in commercial and military applications. According to a report, as the application of such magnets [...]
Giant Magnetoresistance Have you ever sat around on a rainy day contemplating your computer’s hard disk drive? Though often taken for granted, this magnetized device makes it possible to store and retrieve information digitally – in everything from video games to iPods to your personal computer. The first hard disk drives (HDDs) date back to [...]
Permanent Magnets: A Study in Sticktoitiveness There are two basic kinds of magnets permanent and temporary. We'll take on permanent first which is appropriate, because before humans could invent and exploit temporary magnets, they had to discover the permanent kind first. People first happened upon magnets sometime before 600 BC with the discovery of the [...]
Hybrid Magnets: Best of Both Worlds Unlike most of the math that goes on at the Magnet Lab, the equation you need to make a more powerful continuous field magnet is pretty easy. Take a very powerful superconducting magnet say, 11.5 tesla and a very powerful resistive magnet say, 33.5 tesla and put them together. [...]
Electromagnets: Two Forces Team Up Resistive electromagnets, another type of temporary magnet, combine the powers of electricity and of magnetism to enormous effect. Although superconducting electromagnets, which we'll discuss soon, offer many advantages, certain laws of physics prevent them from reaching the field strengths electromagnets are capable of. Some of the world's most powerful resistive [...]
Superconducting Magnets: Power Unplugged Superconductivity is a very cool phenomenon in which electrical resistance is overcome with the help of very cold temperatures colder than anything this side of Pluto! Most superconducting magnets are made using an alloy called niobium-titanium "Ni-Ti" for short. You could think of it this way: In a superconducting current, the [...]
A Boost for Permanent Magnets Scientists at TU Darmstadt explored on an atomic level how changes in iron content influence the micro-structure of samarium-cobalt based permanent magnets. Their results were published in Nature Communications. In the long run they could contribute to the development of permanent magnets with improved magnetic performance. These magnets can be [...]
Scientists Discover Potential Path to Improving Samarium-Cobalt Magnets Scientists have discovered a potential tool to enhance magnetization and magnetic anisotropy, making it possible to improve the performance of samarium-cobalt magnets. The scientists, at the U.S. Department of Energy's Critical Materials Institute at Ames Laboratory, in collaboration with the Nebraska Center for Materials and Nanoscience and [...]
How to Measure the Density of Magnetic Materials? Materials that respond in a certain way to a magnetic field are called magnetic materials. According to the magnetic strength of the material in the external magnetic field, it can be divided into diamagnetic material, paramagnetic material, ferromagnetic material, antiferromagnetic material and ferrimagnetic material. Ferromagnetic substances and [...]
Motor Hall Sensor Magnetic Ring Probably most people will feel strange when they hear this term. In fact, it often appears in our lives. It is usually used in the automobile industry, taxi meters, and inverters. Let ’s take a look at motors. Application principle of Hall sensor magnetic ring. The motor hall sensor magnetic [...]
Precise multi-pole magnetic component and manufacturing method thereof Abstract A method is proposed to manufacture a precise multi-pole magnetic component for using in magnetic encoders. A special layout of the circuit pattern is designed and formed on a printed circuit board (PCB). Alternate and regular magnetic field is induced according to Ampere's law after a [...]
3D electromagnetic analysis and experimental verification of multi-pole magnetization BLDC motor ABSTRACT This paper presents a quasi-3D electromagnetic analysis of the multi-pole magnetization BLDC motor. The permanent magnet (PM) of a multi-pole magnetization BLDC motor has several poles in a magnet. The polar separation section of the multi-pole PM is implemented through the magnetization pattern [...]
What Is a Magnetometer? Learn the basics of magnetometers, including their relation to hysteresis curves and their applications. Magnetometers are devices that can measure the magnitude or direction of a magnetic field. They are present almost everywhere in electronics. They may be as simple as the one that your smartphone uses to detect whether it [...]
MULTI-POLE MAGNETIC CIRCUIT COMPARISONS Permanent magnets can be magnetized with two or more (4, 6, 8, etc.) poles, using permanent or pulse magnetic flux. Pulse magnetization allows achievement of larger magnetic fields necessary for Nd-Fe-B or Sm-Co magnets. Multi-pole magnetization requires special magnetization heads with preformed windings which allow achievement of required distribution of magnetic [...]
Magnet Concept Am area of the magnet, is the cross sectional areal of the magnet perpendicular to the central flux line, measured in sq.cm. at any point along its length. In design, am is usually considered the area at the neutral section of the magnet. B Magnet induction, is the magnetic field induced by a [...]
Residual Magnetic Flux Density Distribution Calculation Considering Effect of Aligning Field for Anisotropic Bonded NdFeB Magnets Abstract This paper presents a calculation method of residual magnetic flux density distribution for a four-pole anisotropic bonded NdFeB permanent magnet (PM) considering the effect of aligning magnetic field during the forming process. To manufacture the anisotropic bonded NdFeB [...]
Magnetic Working Point Magnetic Working point (Magnetic operating point) is a point, where the working line (load line) intersects the magnet's B-H demagnetization curve, and indicates the B and H state of the magnet in the magnetic circuit. Knowing the working point is essentia lasit makes possible to forecast the magnetic flux density Bd that [...]
Types of Magnetic Gears - Based on their operations, magnetic gears can be classified into three types: linear magnetic gears (LMGs), coaxial magnetic gears (CMGs), and axial magnetic gears (AMGs). For LMGs and CMGs, the magnetic flux is typically generated radially inward or outward with reference to the shaft axis. However, for AMGs, magnetic flux [...]
Magnetic Units of Measurement Magnetic Units of Measurement - If the burden of two systems of measurement for common quantities (English vs. metric) throws your mind into confusion, this is not the place for you! Due to an early lack of standardization in the science of magnetism, we have been plagued with no less than [...]
Magnetic fields - The strength of a magnetic field is measured in units of Gauss (G), or alternatively, in Tesla (T). In the MKS (metric) system of units, 1 T = 1 kilogram*ampere/second^2 = 10^4 G. magnetic field For comparison, the magnetic field of the earth at the surface is on the order [...]
