Nanocrystalline soft magnetic alloy magnetic core with low angle difference for smart meter and preparation method thereof

Abstract

The invention belongs to the field of magnetically soft alloy and particularly discloses a low-angle-difference nanocrystalline magnetically soft alloy magnetic core for an intelligent electric meter and a preparation method thereof. The molecular formula of the magnetic core is shown as follows: Fe100-a-b-c-d-eSiaBbMcCudNbeM'f, wherein a, b, c, d, e and f are atomic percents, 8<=a<=14, 2<=b<=10, 0.8<=c<=3, 1<=d<=4, 0.5<=e<=2, 0.02<=f<=0.5, the balance is Fe and unavoidable impurities, M is Al or Zn, and M' is one or more of Y, Gd, V, Mo, Mn, Ge, Er, Ga and Sn. The magnetic core which is prepared through a resultant magnetic field annealing treatment method and is excellent in soft magnetic property is further provided, and the requirement for high-precision measurement with a low-angle-difference mutual inductor for the intelligent electric meter is met.

Description

technical field [0001] The invention belongs to the field of soft magnetic alloys, and in particular relates to a low-angle-difference nanocrystalline soft magnetic alloy magnetic core for smart meters and a preparation method thereof. Background technique [0002] For household electric energy metering, turntable induction meters have been used in the past, but in recent years, with the intelligentization of electric energy metering, especially the implementation of remote meter reading and segmented billing systems, smart meters have begun to be popularized. Current transformers are essential for smart meters, and magnetic cores are the core components of current transformers. At present, amorphous nanocrystalline soft magnetic alloy strips are widely used as transformer cores. The accuracy of the current transformer determines the measurement accuracy of the smart meter, and the comprehensive magnetic properties of the transformer core is one of the main factors affecting...

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Problems solved by technology

However, most composite magnetic core structures cancel the setting of the air gap in order to avoid the increase of the winding loss due to the setting of the air gap. However, although it reduces the winding loss, it will lead to an increase in the core loss, so that the magnetic components Increased total loss and lower frequency of application

[0004] U.S. patent application US20030151483 discloses a transformer core made of iron-based amorphous alloy. Its saturation magnetic induction can reach more than 1.5T, but its initial magnetic permeability is low and the loss is large. Poor can not meet the requirements of high precision