Amorphous Transformer Core

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Amorphous Transformer Core

Amorphous transformer cores are made by winding thin, non-crystalline alloy ribbon into a rectangular shape with rounded corners. The ribbon’s material structure and small thickness help reduce magnetic loss. The central window leaves room for the windings, and the open joint lets the core be fitted around them during assembly. These cores are used in single-phase and three-phase distribution transformers for utility networks, commercial buildings and industrial sites. They are especially useful where transformers remain energized for long periods, because no-load loss continues even when electricity demand is low.

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Amorphous Transformer Core amorphous core amorphous steel core transformer amorphous c-core amorphous alloy core

Product Details

Product Description

Amorphous transformer cores are used in single-phase and three-phase distribution transformers where low no-load loss is a key design goal. Thin amorphous alloy ribbon is wound into rectangular cores with rounded corners, forming the magnetic path around the transformer windings. The rectangular window provides space for the winding assembly.

The open joint allows the core to be assembled around the windings. Window dimensions, ribbon width and core build can be selected for different winding arrangements and magnetic cross-sections. Core performance is evaluated at the specified operating frequency and magnetic flux density.

Technical Specifications

Parameter	NJREC Specification
Saturation Flux Density	1.64 T
Coercive Force	≤3.8 A/m
Specific Core Loss at 50 Hz, 1.35 T	0.14 W/kg
Specific Exciting Apparent Power at 50 Hz, 1.35 T	0.16 VA/kg
Lamination Factor	≥88%
Material Density	7.25 g/cm³
Crystallization Temperature	475°C
Curie Temperature	374°C
Vickers Hardness	980 HV
Ribbon Thickness	23–25 μm

The specific core loss and exciting apparent power values apply to the stated test point of 50 Hz and 1.35 T. The no-load loss of a complete transformer is assessed separately.

Please send NJREC the latest drawing, steel specification, quantity, required supply condition and delivery destination.

Why Choose NJREC

Application-focused selection: Window size, ribbon width and core build are considered together for the intended single-phase or three-phase transformer.
Clear performance data: Core loss and exciting apparent power are stated with their test frequency and magnetic flux density.
Assembly coordination: The core opening, winding installation sequence and protection of the ribbon layers can be included in the order requirements.
Order identification: Individual core identification supports batch handling and order checking.

Factory

Amorphous Transformer Core Production Photos

Rectangular wound Amorphous Transformer Core

Amorphous transformer cores are made from thin amorphous alloy ribbon wound into rectangular sections. Their open ends allow the windings to be installed before the core is closed. Window dimensions provide space for the winding assembly, while ribbon width and core build determine the magnetic cross-section. This construction is used in distribution transformers designed to reduce no-load loss.

Wooden-Case Export Packaging

Wooden cases during CRGO transformer core packing

Closed reinforced wooden cases with pallet-style bases

The transformer cores are wrapped and secured inside reinforced wooden cases with timber crossbars and straps to limit movement during handling and transport. The cases have reinforced panel frames, metal corner brackets and pallet-style bases for forklift handling. Internal supports and wrapping are arranged according to each core's dimensions, weight and assembly condition. Any additional moisture or edge protection can be confirmed before packing.

Container Loading

Forklift moving wooden transformer core cases into a shipping container

Wooden transformer core cases being positioned inside the container

Please send NJREC the latest drawing, steel specification, quantity, required supply condition and delivery destination.

FAQ

Can an amorphous core replace a CRGO core without changing the drawing?

A direct substitution should not be assumed. The selected amorphous material, magnetic cross-section, window space, joint arrangement and winding installation method must be checked against the transformer design. A lower material-loss figure alone does not establish dimensional or electrical compatibility.

What does a core-loss value in W/kg tell me?

It states loss per unit mass for the specified material or core at defined test conditions. To evaluate a complete core, confirm its mass and finished-core test result in W, together with frequency and flux density. The transformer's no-load loss is assessed separately on the assembled transformer.

Why do the window and joint dimensions matter?

The windows must accommodate the windings and required clearances, while the joint determines how the magnetic circuit is assembled around them. Joint build and any edge protection also affect the finished envelope. These dimensions are especially relevant when changing from a CRGO design to an amorphous design.

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