A Comparative Study of Methods to Magnetizing the Magnetic Materials

S Karthikeyan, P Nithya

Abstract


Permanent magnets are used in the following major groups: acoustic transducers, motors and generators, magneto mechanical devices, magnetic field and imaging systems. In many products, such as televisions, telephones, computers, audio systems and automobiles permanent magnets are present. Two major families of rare earth permanent magnets are Sm-Co magnets and Nd-Fe-B magnets.  The NdFeB is used in high performance stepper, DC, servo, and linear motors, actuators, loudspeakers, headphones, instrumentation, switches, relays, magnetic imaging for medical and geophysical applications, holding systems, magnetic bearings, magnetic couplings, hard disk drives and etc.,. When magnets are first produced, they are not magnetic, or weakly magnetic. For the magnet to have the properties we need, it must be magnetized. The process of magnetization requires generation of intense magnetic fields in close proximity with the magnetic material to be magnetized. In this paper a comparative study is performed with different magnetization techniques used for hard saturation of the magnetic materials.

Keywords


Permanent magnets, NdFeB magnets, high pulsed fields, magnetization characteristics, magnetization techniques.

References


JK Lee, “The Analysis of a Magnetizing Fixture for a Multipole Nd-Fe-B Magnet”, IEEE Transactions on Magnetics Vol 24, N0.5, Sept 1988 pg 2166-2171

"Magnetizing Techniques for Rare-Earth magnets," J.R. Place, PCIM July 1988, pp 26-29.

R. Parker and R. Studders, “Permanent Magnets and their Application” Wiley 1962, esp. Chapter 7,“Magnetization and Demagnetization”

H. Knoepfel, Pulsed High Magnetic Fields, North-Holland Publishing Co., 1970

Joseph J. Stupak Jr, “ Methods of magnetizing permanent magnets” EMCW Coil Winding Show,1 October-2 November 2000, Cincinnati , Ohio.

H. Feshki Farahani and S. M. Pedram Razi, “ Analysis of Effective Parameters on Magnetizer Using Finite Element Method” ,24th international power system confere.


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