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  The design of the magnetic core does not allow any current to flow. However, it is a conductive loop that undergoes a changing magnetic field, so small currents are induced in it-these are called "eddy currents." Laminated cores  reduce it to a minimum because they interfere with the effective transmission of energy from the primary coil to the secondary coil. Eddy currents cause energy loss from the transformer when heating the core, which means that electrical energy is wasted as excess heat. Laminating refers to "consisting of insulating layers of iron "glued" together", rather than in a single solid "block." Compared with non-laminated cores having the same number of domains, laminated cores have higher electrical resistance. Therefore, it does not generate such a large current.

  Transformer  windings are another important part of the transformer structure because they are the main current-carrying conductors wound on the laminated part of the core. As shown in the figure, in a single-phase two-winding transformer, there will be two windings. The one that is connected to the voltage source and generates magnetic flux is called the primary winding, and the second winding is called the secondary winding. The result of mutual inductance is the induced voltage. If the secondary output voltage is less than the primary input voltage, the transformer is called a "step-down transformer". If the secondary output voltage is greater than the primary input voltage, it is called a "boost transformer". ​ The type of wire used as the main current-carrying conductor in the transformer winding is copper or aluminum. Although aluminum wire is lighter and generally cheaper than copper wire, it must use a larger conductor cross-sectional area to carry the sam...

The  tape wound toroidal core  is close to the perfect magnetic path configuration and allows for the most efficient application of high magnetic conductivity magnetic alloys. The physical and magnetic properties of the ring reveal many features that contribute to this near-perfect circuit. For example, the air gap in the magnetic path is so small that it does not exist. This minimizes loss, edges, leaks, deformations, and reduces the magnetic force required to produce a given flux within the material. In the ring core and coil assembly, the entire magnetic circuit is contained in the electrical winding, further reducing the leakage flux and increasing the coupling of the winding to the winding. The tape wound cores does produce a smaller flux up the axis, but this leakage flux can be suppressed by assembling it into a ring stack at the top and bottom of the core. The tape wound core configuration also provides good self-shielding to resist external magnetic fields. A sin...

Transformers often require/use iron cores because they operate on magnetic forces, which are difficult to understand when sharing certain characteristics with good old "electricity" (ohms, volts, amperes, etc.). Let's try some simplified ways to get the overall idea. Start with a screwdriver - just a cylindrical coil. If we let the current flow through, a magnetic field (we call it the H field) is formed. The field depicted with the imagined field line flows up through the center of the coil, then disperses again after leaving the cylinder, then reassesses and re-enters the other end. You've seen the picture in the textbook. The magnetic field is strong and contained inside the cylinder (ID), while the magnetic field strength is weak outside (OD) because it diffuses in space. If the H magnetic field interacts with "anything" around the coil, whether it is vacuum, air or iron, it produces what we call a B magnetic induction field within the "material...

Many people know that magnetic shields provide protection by stopping or negating unwanted interference from magnetic fields. But most people have no idea how the shield actually works. There are different ways and materials used in magnetic shielding depending on the frequencies and strengths of the magnetic fields. With the purpose of explaining for this instance, we will use passive low frequency magnetic shielding as an example. The shielding is  normally made of  Mu Metal sheet , and it is formed into a sheet metal component or assembly before being heat treated to maximize the shielding factor of the material. It is normal to expect that a magnetic shield works exactly as what it says and acts as a shield blocking the magnetic field away from the protected area. In essence a magnetic shield does exactly in the opposite way, acting as a “sponge” drawing the magnetic field in. It is where that the clever bit happens: the magnetic field is now directed along the path of the...

You may haven’t noticed but you’d be surprised if you realize how many items you’re using daily or you may encounter in your lifetime which have Mu Metal magnetic shields applied within them. As nowadays we’re living in a society that largely dependent on technology and electronic devices, it’s more and more important to shield the electromagnetic interference emitting from those various kinds of devices or protecting these sensitive electronic devices from outside forces. * Have you ever been in medical facility? If yes, you were actually unknowingly surrounded by Mu Metal magnetic shields. From advanced MRI systems to small disposable parts, Mu Metal is in a broad spectrum of medical devices and accessories. * Have you ever walked through a security scanner at the airport? You just walked through a Mu Metal magnetic shielding product. * Have ever you navigated in your daily life with the help of GPS systems? Without magnetic shielding this technology couldn’t be so accurate. These ar...