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Magnetic hysteresis is the phenomenon where the magnetization of a material depends not only on the current magnetic field, but also its history. When the magnetic field is applied and then removed, the material retains some magnetization, showing a lag or "memory" in its response to changing magnetic fields. This results in the characteristic hysteresis loop observed in magnetic materials.
What else can I help you with?
Explain the B-H curve?
The B-H curve, also known as the magnetization curve, represents the relationship between the magnetic field (H) applied to a material and the magnetic induction (B) it exhibits in response. It shows how magnetization changes with the strength of an external magnetic field and helps characterize the magnetic properties of a material, such as ferromagnetic materials showing hysteresis.
What is true of any ferromagnetic materials?
It has an abnormally high magnetic permeability, it has a definite saturation point, and it has appreciable residual magnetism and hysteresis. That's why it remains magnetic even after the forcing magnetic field goes away.
Why the hysteresis curve is so fat in a sample?
The fatness of a hysteresis curve in a sample can be due to factors like impurities in the material, sample geometry, and microstructural features causing domain movement with different energy barriers. These factors can lead to a wider range of magnetic responses within the sample, resulting in a broader hysteresis curve.
How do you calculate the Hysteresis loss given a B-H curve?
hysteresis loss= K B^1.6 egs/sec where k is STEINMEITZ coefficient and B is the maximum magnetic flux density
The effects of reluctance and hysteresis with respects towards the magnetic circuits?
You can compare a magnetic circuit to an electric circuit, wheremagnetomotive force is equivalent to electromotive forceflux is equivalent to currentreluctance is equivalent to resistanceFor a magnetic circuit, the equivalent of Ohm's Law is: flux = mmf/reluctance.So, for a given value of magnetomotive force, the greater the reluctance, the lower the resulting flux. For example, iron will have a very low value of reluctance whereas air will have a very very high reluctance, so if a magnetic circuit has an airgap, then the overall reluctance of the circuit will be far greater than for a magnetic circuit without an airgap.Hysteresis comes from a Greek word, meaning to 'lag behind'. It describes how a magnetic circuit's flux density behaves when it is continuously magnetised and demagnetised. For example, when we apply a magnetising force, the flux density increases but, if we then remove the magnetising force, some flux density remains and, in order to remove this, we need to apply a magnetising force in the opposite direction. The amount of flux density remaining after we remove the magnetising force is called 'retentivity' and, for materials such as steel, this is quite large; but for other materials, such as iron, this is very small. So, hysteresis is a way of describing whether a metal is going to be suitable for use as a permanent magnet or for use as a temporary magnet. In particular, we need to understand the significance of hysteresis when choosing a suitable metal to manufacture transformer cores or motor magnetic circuits.
Does a diamagnetic substance exhibit hysteresis loss?
No, diamagnetic materials do not exhibit hysteresis loss because they do not have permanent magnetic moments that can be aligned and re-aligned in response to an external magnetic field. Hysteresis loss occurs in ferromagnetic materials due to the energy dissipated during the reversal of magnetic domains.
How can hysteresis loss in magnetic material may be reduced?
Hysteresis losses depend on the type of metal used to manufacture the magnetic circuit of a machine. Most magnetic circuits are made from silicon steel. Generally speaking, there's not much you can do to reduce hysteresis losses as that has already been factored in by the machine's designer.
Why core is made up of silicon steel?
produces magnetic properties,such as small hysteresis area and permeability Hysteresis loss depends upon the material of the core
WHAT IS THE The phenomenon in which magnetism lags behind the magnetizing current?
The phenomenon you are referring to is known as hysteresis. In hysteresis, the magnetic field in a material lags behind changes in the magnetic field strength, creating a loop-shaped relationship between the magnetic field and the magnetic flux density. This lag is due to the alignment of magnetic domains within the material.
What has the author Walter Lynn Cheney written?
Walter Lynn Cheney has written: 'Magnetic testing of straight rods in intense fields' -- subject(s): Magnetic testing 'Measurement of hysteresis values from high magnetizing forces' -- subject(s): Hysteresis
What is the significance of hysteresis?
Hysteresis is the delay between an observed outcome and the quantity of change applied.When a ferromagnetic material is magnetized in one direction, it will not relax back to zero magnetization when the imposed magnetizing field is removed. It must be driven back to zero by a field in the opposite direction. If an alternating magnetic field is applied to the material, its magnetization will trace out a loop called ahysteresis loop. The lack of retraceability of the magnetization curve is the property called hysteresis and it is related to the existence of magnetic domains in the material. Once the magnetic domains are reoriented, it takes some energy to turn them back again. This property of ferrromagnetic materials is useful as a magnetic "memory". Some compositions of ferromagnetic materials will retain an imposed magnetization indefinitely and are useful as "permanent magnets". The magnetic memory aspects of iron and chromium oxides make them useful in audiotape recording and for the magnetic storage of data on computer disks.Variations in Hysteresis CurvesThere is considerable variation in the hysteresis of different magnetic materials.
The area of hysteresis loop in a ferromagnetic material of?
The area of the hysteresis loop in a ferromagnetic material represents the energy losses that occur during the magnetization and demagnetization processes. It is a measure of the energy dissipated as heat due to the magnetic domain reorientation within the material. The larger the area of the hysteresis loop, the greater the energy losses and the lower the efficiency of the material in applications such as transformers or inductors.
What is the hysteresis motor with diagram?
A hysteresis motor is an AC motor that operates based on the magnetic hysteresis effect, where the rotor's magnetic material retains some magnetization after the external magnetic field is removed. This motor typically features a smooth, squirrel-cage rotor and operates without brushes, which reduces maintenance. The rotor aligns itself with the rotating magnetic field of the stator, resulting in continuous rotation. While I cannot provide a diagram, a simple representation would show the stator with windings and the rotor, illustrating the magnetic field lines interacting with the rotor.
What is hystereses losses in trans former?
Hysteresis losses in a transformer refer to the energy lost due to the magnetization and demagnetization of the core material during each AC cycle. This phenomenon occurs because the magnetic domains in the core material do not return to their original positions when the magnetic field reverses, resulting in heat generation. Hysteresis losses are influenced by the material properties of the core, the frequency of the alternating current, and the peak magnetic flux density. These losses are typically minimized by using high-quality magnetic materials with favorable hysteresis characteristics.
Explain the B-H curve?
The B-H curve, also known as the magnetization curve, represents the relationship between the magnetic field (H) applied to a material and the magnetic induction (B) it exhibits in response. It shows how magnetization changes with the strength of an external magnetic field and helps characterize the magnetic properties of a material, such as ferromagnetic materials showing hysteresis.
What does hysteresis mean in magnetism?
A hysteresis curve is a plot, graph or some kind of pictorial representation of the relationship between the magnetic field strength (H) and the magnetic flux density (B) of a material under inspection.
Causes of hysteresis loss in transformer?
No, you're hysteresis losses are set by Bmax, frequency, and material. The function is highly nonlinear and the loss goes up disproportionately with Bmax. When designing power transformers, you typically want the hysteresis + eddy losses to equal the copper losses.
