High Pulsed Field Magnetization – Simulation, Analysis and its effects

Introduction

High Pulsed field generation

Finite element analysis – Magnetostatics & Electromagnetics

Study of effect of impulse field

Time -Temperature Behavior in Magnetizing Fixture

Measurement of Impulse current & impulse magnetic field

Abstract

The study of different techniques of generation of impulse current and production of impulse field affecting the magnetic property of the any magnetic material. The analysis and simulation of high impulse current and high magnetic field through FEA & FEM. Te temperature behavior of magnetizing fixture due to high current.  The measurement of impulse current and impulse magnetic field.

Impulse magnetization were the technique adopted to magnetize High energy hard magnetic material like NdFeB,. SmCo, SmFe etc. These materials in particular have high remenance and coercivity which yields them to have high energy product. Magnets produced from this kind of material by nature have to be magnetized at a very high field of 40-50 kilo-Oersted for their complete saturation. The magnetic domain reversal occurs in less than 100 nanoseconds whereas the impulse time scale is about 0.1 milli-seconds. At the peak field the magnet can be saturated at the available coercive force.

Generation of high magnetic field of about 5 Tesla for in a continuous fashion is highly tedious; an alternate method is being followed to produce an impulse current. An Impulse magnetizer is usually used to generate an pulsed current by rapidly discharging the capacitors by means of an electronic switch from a stored electric charge in a bank of capacitors at high voltage. The life of the impulse ceases down in few milli-seconds producing a high pulsed current.

Impulse current in due is generated as high magnetic field in a solenoid to magnetize high energy magnets. Solenoids are capable of producing high pulsed magnetic field in a time frame of 0.1- 4.0 milli-seconds.

Analysis of solenoid for was carried out with Finite Element Method on Magnetics (FEMM) software. The simulation of solenoid includes the flux density distribution, field produce from the pulsed current, inductance, resistance etc. Electrical parameter of the solenoid was studied to perform theoretical calculation for the pulsed current. The inductance and the resistance play a major role in determining the generated current in an impulse magnetizer.

The impulse current is also measured by a storage oscilloscope that has been interfaced with a computer system to record the wave form of the pulse and the maximum current it develops.  Magnetic field produced in the solenoid was simulated with FEMM and their results were compared with the theoretical values.

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