What is a Permalloy core?
Permalloy typically refers to iron-nickel alloys with nickel content ranging from 30% to 90%. It is a widely used soft magnetic alloy. By employing appropriate processing techniques, its magnetic properties can be effectively controlled—for instance, achieving an initial permeability exceeding 105, a high permeability surpassing 106, a coercive force as low as 2‰ Oersted, and a rectangularity factor close to either 1 or nearly 0. Permalloys with a face-centered cubic crystal structure exhibit excellent ductility, allowing them to be fabricated into ultra-thin ribbons as thin as 1 μm and processed into various forms suitable for different applications. Commonly used alloys include 1J50, 1J79, and 1J85. The saturation magnetic induction of 1J50 is slightly lower than that of silicon steel, yet its permeability is several dozen times higher, and its iron loss is 2 to 3 times lower than that of silicon steel. When used in transformers operating at relatively high frequencies (400–8000 Hz), 1J50 exhibits low no-load current, making it ideal for manufacturing small, high-frequency transformers rated below 100 W. 1J79 boasts excellent overall performance and is well-suited for high-frequency, low-voltage transformers, as well as for the cores of leakage protection switches, common-mode inductors, and current transformers. The initial permeability of 1J85 can reach over 105, making it particularly appropriate for use in low-frequency or high-frequency input-output transformers handling weak signals, common-mode inductors, and high-precision current transformers.
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