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Name: harden
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1993

How are permanent magnets commercially made?

I do not know how they are made on a large scale, and I will bet that each type of magnet is made differently. Maybe others will help outhere. I can tell you how they are made for permanent magnet motors though. Once the material is cast (Alnico, Sumarian Cobalt, "Neo-Iron", etc.) ground, and heat treated (in some cases), it has no particular magnetic field. In the case of a PM motor, they are all placed in the motor stator housing (or around the rotor in the case of brushless systems) and placed around a cone with wire windings and magnetic steel on them. It is a special machine that charges large capacitors, and then very rapidly discharges them through the coil surrounded by the magnetic material. Depending upon the air gap, and the rate of discharge, and the amount of the charge, as well as the material used, after each discharge it will yield magnetic fields around the material in the motor. A good source for this data is a magazine called "Motion" published by Dr. Jacob Tal in California.


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