What is demagnetizing magnetic field?
The demagnetizing magnetic field is the magnetic field Hd generated by the magnetization M within the magnet. The total magnetic field in the magnet is a vector sum of the demagnetizing field and the magnetic field generated by any free or displacement currents.
What causes the demagnetizing field?
The total magnetic field in a region containing magnets is the sum of the demagnetizing fields of the magnets and the magnetic field due to any free currents or displacement currents. The term demagnetizing field reflects its tendency to act on the magnetization so as to reduce the total magnetic moment.
What are 3 ways to demagnetize a ferromagnetic material?
Demagnetization processes include heating past the Curie point, applying a strong magnetic field, applying alternating current, or hammering the metal. Demagnetization occurs naturally over time.
What is meant by demagnetizing effect?
The opposition of armature flux on the main field flux is called armature reaction. This armature reaction has two undesirable effects, either it weakens (reduces) the main field flux called ‘Demagnetising Effect’ or it distorts the main field flux called ‘Cross-magnetising Effect’.
Why demagnetization process is important?
Demagnetization is required to remove the magnetic fields in the material that counteract those of the eddy current probe. This interaction can influence the test so strongly that the test results exceed the sorting threshold and the test piece is declared as a bad part despite its sufficient properties.
What is demagnetization curve?
A demagnetization curve describes the magnetic qualities of a magnet more completely than a single number like Pull Force or Surface Field. It provides information about the strength of the magnet, how hard it is to demagnetize, and how a magnet’s shape (or use in a magnetic circuit) affects matters.
How do you find the field of demagnetization?
1.5. The demagnetizing field can be expressed as Hd = ΔN·Ms, where ΔN is the difference in the demagnetizing factors for different axes. For spherical particles ΔN is 0, therefore there is no shape anisotropy present.
What is the best method of demagnetizing a steel?
Steel can be demagnetized with a commercial demagnetizer, a hammer or by heating it to a very high temperature, known as the Curie temperature.
What is the effect of demagnetizing component of armature reaction?
Explanation: When the armature of a dc machine carries current, the distributed armature winding produces its own mmf (distributed) known as armature reaction. The demagnetizing component acts in the opposite direction, reducing flux/pole in a machine, which will ultimately reduce generator emf.
What is another name for this demagnetization process?
Degaussing is another term for demagnetizing.
What are the differences between magnetization and demagnetization?
A piece of iron can be magnetized by electric current. When a piece of iron touches to a magnet then the iron piece will be magnetized. Demagnetization : When we remove the magnetic property of the magnet it process is called demagnetization.