Patent ID: 6120617
Filing Date: 2000-09-19
Classification: C21D,H01F,Y10S,Y10T

Abstract:
A method for producing a pronounced pulse by the introduction of a pulse generator having magnetic poles into an alternating magnetic field, due to a sudden reversal of the magnetic poles of said pulse generator in said magnetic field, said method comprising the steps of:selecting an iron alloy from a group of iron alloys which, when heated, expand in volume substantially uniformly until reaching a first temperature and thereafter exhibit diminished expansion and which, when cooled from said first temperature to room temperature, contract in volume substantially uniformly until reaching a second temperature, above room temperature, at which said iron alloys rapidly and pronouncedly expand in volume;selecting a soft magnetic material from a group of soft magnetic materials which expand substantially uniformly when heated at least to said first temperature and which contract substantially uniformly when cooled from said first temperature to room temperature;forming an elongated composite member of an iron alloy selected from said group of iron alloys and at least one soft magnetic material selected from said group of soft magnetic materials;subjecting said composite member to a thermal treatment to produce said pulse generator, wherein said composite member is elevated at least to said first temperature and is subsequently cooled to room temperature for causing said iron alloy and said at least one soft magnetic material in said composite member to become mechanically stressed due to their differing expansion and contraction behavior;generating an alternating magnetic field; andintroducing said pulse generator into said magnetic field and thereby causing a reversal of the magnetic poles of said pulse generator to produce said pronounced pulse.