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Common mode inductors, also commonly referred to as common mode chokes, are vital passive components in electronic circuits. Their core function is to suppress common mode interference signals while allowing normal differential mode signals or DC power to pass through without attenuation. This ensures the stable operation of electronic equipment and helps meet electromagnetic compatibility (EMC) standards.
A current transformer (CT) is an electronic device used to detect the magnitude and direction of current flowing through a conductor and convert it into measurable signals (such as voltage, current, or digital signals). As a critical component for current monitoring, control, and protection in power systems, smart devices, and industrial automation, it is hailed as the "nerve endings" of electrical systems.
Gapped cores refer to the intentional introduction of a non-magnetic space (i.e., an air gap) into the closed magnetic circuit of magnetic materials such as iron-based amorphous alloys or silicon steel sheets. Although the physical dimension of the air gap is typically extremely small (sometimes less than one millimeter), it significantly alters the flow of magnetic flux within the core, making it one of the most powerful yet subtle parameters in the design of magnetic devices. Cut cores represent a critical form in core manufacturing and processing. The core process involves using high-precision mechanical or laser cutting to machine continuous silicon steel strips or wound closed cores into specific shapes or dimensions.
As a highly cost-effective metallic soft magnetic material, iron-based nanocrystalline alloys are composed of iron, silicon, boron, niobium, and copper. Through a specialized crystallization annealing process, an ultra-fine nanocrystalline grain structure of 10–20 nm is formed internally. This material not only boasts superior magnetic properties, including high saturation magnetic induction, high permeability, and low core loss, but also exhibits excellent toughness and corrosion resistance. Currently, it is progressively replacing silicon steel, permalloy, and ferrites, becoming the preferred choice for manufacturing mid-to-high-frequency transformers, instrument transformers, and common-mode inductors.
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