What is a Step Lap Full Mitre Core
Oct 22, 2025
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In a step-lapped mitre core, the core steel is mitre cut and step stacked in groups of 5 -7 laminations at a time. In this arrangement, the grain orientation of the core steel lines up with the direction of the flux, which then flows parallel with the direction of the grain orientation.
Four main parts make up a dry-type transformer: the core, the coils, the terminals and the structural frame. The core's job is to provide a path for the magnetic flux where the windings are linked, transferring energy from the primary winding to the secondary winding. When voltage is applied to the primary, current flows producing a magnetic field, or flux. Secondary voltage is induced due to the coupling of the secondary to the magnetic field.
Energy is required to magnetize the core. The amount of energy required depends on the composition of the core material, joints or air gaps within the core and the type of core construction. The four main types of core construction are wound cores, stamped laminations, butt-lapped cores and step-lapped miter cores.
Step Lap Full Mitre Core Benefits
Lower Losses:
The step-lap joint reduces local saturation effects in the joint, leading to lower energy losses.
Reduced Noise and Magnetizing Current:
This design can significantly decrease noise levels and the amount of magnetizing current needed.
Improved Efficiency:
The optimized magnetic path and reduced leakage flux result in a more efficient transformer core.
Labor Savings:
Using a single piece yoke instead of a double yoke and more plates per layer can lead to labor savings during assembly.
Structural Strength:
The interlocking steps create a more rigid and mechanically stable core.
Silicon Steel specification
| Material | Cold-Rolled Oriented Silicon Steel/Non-Oriented Silicon Steel |
| CRGO: 20ZDKH75, B20P075, B20P070, B18R070 B23G110, B23G100, B23P100, B23R095, B23R090, 23ZH90, 23QG090 B23R080 27Q120, 27QG100, 27QG095, B27P120, B27P100, B27P095 30Q130, 30Q120, 30QG105; B30G130, B30G120, B30P120, B30P105 35Q155, B35G155, 35Z155 |
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| CRNGO: B35A270, B35A250, B35A230, B35A300, 35WW270, 35WW250, 35WW230 B50A Grade 800, B50A600, B50A470, B50A400, B50A310, B50A290, B50A250, B50A1300, B50A1000 |
|
| Form | Annealed / Non-Annealed / Rectangular/ Three Phase / Single Phase |
| Dimension | Width: 3-300mm; Length: 3-2500mm |
| Thickness | 0.1mm, 0.18mm, 0.20mm, 0.23mm,0.27mm,0.30mm,0.35mm, 0.5mm |
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Founded in 2008 and located in Anyang in China, Gnee Electric is a high-tech enterprise specializing in researching and manufacturing iron core products.
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GNEE EC was founded in 2008, which is a National High-tech Enterprise & Famous Brand Enterprise in China, developing into a professional manufacturer and supplier of high-quality iron cores.
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Over 200 employees;
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