LIFTER WITH ELECTROPERMANENT MAGNETS

摘要

A lifter with electro-permanent magnets comprises an external bearing structure (2, 3) closed at the bottom by a plate, provided with a heat shield (9), from which the circuit poles (1) protrude with their pole pieces (5), each of the electro-permanent magnets being composed of a reversible magnet (6) arranged on top of one of said poles (1), of a fixed polarization magnet (7) formed by a plurality of blocks placed along the lateral faces of the pole (1) and of a coil (8) arranged around the reversible magnet (6) to cause the reversal of the polarization of the latter by means of an electrical pulse, the fixed polarization magnet (7) being made of an alloy of samarium-cobalt that has a Curie point of about 770° C. and a residual coercive field able to resist the pulse of polarization reversal of the reversible magnet (6) even when the lifter operates on materials at 600-650° C.

主权项

1. Lifter with electro-permanent magnets comprising an external bearing structure closed at the bottom by a plate provided with a heat shield, the circuit poles of said electro-permanent magnets with their possible pole pieces protruding from said bottom plate, each of the electro-permanent magnets being composed of a reversible magnet; arranged on top of one of said poles and in contact therewith, of a fixed polarization magnet formed by a plurality of blocks placed along the lateral faces of said pole, and of a coil arranged around said reversible magnet and suitable to cause the reversal of the polarization of the latter by means of an electrical pulse, wherein the fixed polarization magnet is made of an alloy of samarium-cobalt that has a Curie point of about 770° C. and a residual coercive field able to resist said pulse of polarization reversal of the reversible magnet even when the lifter operates on materials at 600-650° C.