DISTRIBUTED GAP ELECTRICAL CHOKE

PROBLEM TO BE SOLVED: To provide a method of annealing an amorphous core to form a distributed gap in the amorphous core. SOLUTION: An electrical choke has a magnetic core with the distributed gap. The magnetic core is made from an iron based metal alloy which is solidified rapidly. The distributed gap configuration is produced by an annealing treatment which causes partial crystallization of the amorphous alloy. As a result of the annealing treatment, the magnetic core exhibits permeability, in a range of 100 to 400, low core loss (i.e. less than 70 W/kg at 100 kHz and 0.1T) and superior DC bias behavior (at least 40% of the initial permeability is maintained, at a DC bias field of 3980 A/m or 50 Oe). COPYRIGHT: (C)2011,JPO&INPIT