Magnetic core for direct current detection
By designing a multi-layered composite structure of semi-circular ring core one and semi-circular ring core two, combined with the staggered arrangement of nanocrystalline layers and ferrite layers and air gap design, the problem of single core material in traditional current transformers is solved, achieving the requirements of high saturation magnetic flux density and low high-frequency loss, and improving the detection accuracy and reliability of current transformers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHU JUNHUA MATERIAL CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-04-10
AI Technical Summary
Traditional current transformers use a single core material, which cannot meet the requirements of high saturation magnetic flux density and low high-frequency loss. Furthermore, large current or DC components can easily saturate the core, leading to output distortion.
It adopts a multi-layer composite structure of semi-circular magnetic core one and semi-circular magnetic core two, combined with nanocrystalline layer and ferrite layer interleaved, and air gap and insulating gasket are set at the mating surface. It is encapsulated with epoxy resin to improve magnetic performance and stability.
It improves the accuracy and reliability of current transformers, adapts to stable detection in high-frequency environments, reduces the risk of magnetic core saturation, and improves linearity and detection accuracy.
Smart Images
Figure CN224110099U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a mutual -inductor technical field, concretely is a magnetic core for direct current detection. BACKGROUND
[0002] The open-close type current transformer is a current measuring device, mainly used in power system, industrial control and outdoor environment, and directly clamped on the measured wire for detection, especially suitable for the system in operation or the occasion inconvenient to power off.
[0003] The magnetic core of the traditional mutual -inductor has performance bottleneck under high frequency and complex working condition, the magnetic core material of the traditional mutual -inductor is single, cannot satisfy the demand of high saturation magnetic density and low high frequency loss, and the magnetic core of the traditional mutual -inductor is easy to be saturated by large current or direct current component, resulting in the problem of mutual -inductor output distortion, and therefore, the utility model provides a magnetic core for direct current detection. UTILITY MODEL CONTENTS
[0004] The utility model discloses a magnetic core for direct current detection, solve the magnetic core material of traditional mutual -inductor single, cannot satisfy the demand of high saturation magnetic density and low high frequency loss and the magnetic core of traditional mutual -inductor exist large current or direct current component easy to make the magnetic core saturation, resulting in the problem of mutual -inductor output distortion.
[0005] To realize above -mentioned purpose, the utility model provides the following technical scheme: a magnetic core for direct current detection, including half circular ring magnetic core one and half circular ring magnetic core two, two butt joint surfaces of half circular ring magnetic core one and half circular ring magnetic core two each set up one air gap, and two air gaps are symmetrically arranged, the air gap is the plane air gap that leaves empty of butt joint surface processing, the air gap position of butt joint surface of half circular ring magnetic core one and half circular ring magnetic core two is equipped with insulation pad and fills the air gap;
[0006] Half circular ring magnetic core one and half circular ring magnetic core two are arranged in the upper shell and the lower shell of mutual -inductor respectively, two butt joint ends of half circular ring magnetic core one protrude outward at the two ports of the upper shell, two butt joint ends of half circular ring magnetic core two are inwardly received into notches at the two ports of the lower shell, the butt joint end of half circular ring magnetic core one extends to the notch position of the butt joint end of half circular ring magnetic core two and butt joints, forming stable butt joint and ensuring the stability of gap parameter;
[0007] Half circular ring magnetic core one and half circular ring magnetic core two are both multilayer composite structures, half circular ring magnetic core one and insulation pad are encapsulated in the upper shell through an epoxy resin layer, half circular ring magnetic core two and insulation pad are encapsulated in the lower shell through an epoxy resin layer, half circular ring magnetic core one and half circular ring magnetic core two are both nanocrystalline layer and ferrite layer staggered setting laminated composite structures, and an insulation layer is arranged between the nanocrystalline layer and the ferrite layer.
[0008] Preferably, the insulating gasket is an epoxy gasket or a ceramic gasket.
[0009] Preferably, the insulating layer between the half circular ring magnetic core one and the half circular ring magnetic core two is a polyimide insulating layer.
[0010] Preferably, the upper shell and the lower shell are hingedly installed at one side butt end position, the upper shell and the lower shell are provided with threaded connections connected by bolts at the other side butt end position, and a gasket is arranged on the bolt between the threaded connections of the upper shell and the lower shell.
[0011] The utility model has the following beneficial effects:
[0012] The utility model discloses a half circular ring magnetic core one, half circular ring magnetic core two and insulating gasket are set up, and the multilayer composite structure of half circular ring magnetic core one and half circular ring magnetic core two solves the material performance limitation problem, and nanocrystalline layer and ferrite layer provide high saturation magnetic density and inhibit high frequency eddy current, and the air gap arranged between half circular ring magnetic core one and half circular ring magnetic core two solves the magnetic circuit nonlinearity problem, and the air gap increases the magnetic resistance, reduces effective permeability, postpones the saturation point, improves linearity, and the combination of two can significantly improve the precision and reliability of mutual inductor, and adapt to new market demand. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is whole structure schematic diagram of the utility model;
[0014] Figure 2 It is structure schematic diagram of upper shell position of the utility model;
[0015] Figure 3 It is structure schematic diagram of lower shell position of the utility model;
[0016] Figure 4 It is the utility model Figure 1 It is the structure enlarged view of A of the utility model.
[0017] In the drawing: 1, half circular ring magnetic core one;2, half circular ring magnetic core two;121, nanocrystalline layer;122, ferrite layer;123, insulating layer;3, insulating gasket;4, upper shell;5, lower shell;6, epoxy resin layer;7, bolt;8, gasket. DETAILED DESCRIPTION
[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0019] As Figures 1-4 The utility model provides a kind of technical scheme: a magnetic core for direct current detection, including half circular ring magnetic core one 1 and half circular ring magnetic core two 2, two butt joint surfaces of half circular ring magnetic core one 1 and half circular ring magnetic core two 2 each are provided with one air gap, and two air gaps are symmetrically arranged, air gap is the planar air gap that the gap of butt joint surface is left, air gap position of the butt joint surface of half circular ring magnetic core one 1 and half circular ring magnetic core two 2 is equipped with insulating gasket 3 to fill air gap, insulating gasket 3 is epoxy gasket or ceramic gasket, insulating gasket 3 is conducive to the stability of air gap parameter, reduce vibration influence;
[0020] Half circular ring magnetic core one 1 and half circular ring magnetic core two 2 are arranged in the upper shell 4 and lower shell 5 of mutual inductor respectively, the two butt joint ends of half circular ring magnetic core one 1 are outwardly protruding at the two ports of upper shell 4, the two butt joint ends of half circular ring magnetic core two 2 are inwardly retracted into notches at the two ports of lower shell 5, the butt joint end of half circular ring magnetic core one 1 extends to the notch position of the butt joint end of half circular ring magnetic core two 2 and butt joints;
[0021] Half circular ring magnetic core one 1 and half circular ring magnetic core two 2 are both multilayer composite structures, half circular ring magnetic core one 1 and insulating gasket 3 are encapsulated in upper shell 4 by epoxy resin layer 6, half circular ring magnetic core two 2 and insulating gasket 3 are encapsulated in lower shell 5 by epoxy resin layer 6, and the influence of mechanical vibration and humidity on magnetic properties is reduced by encapsulation of epoxy resin layer 6, half circular ring magnetic core one 1 and half circular ring magnetic core two 2 are both laminated composite structures with nanocrystalline layer 121 and ferrite layer 122 staggered, and an insulating layer 123 is arranged between the laminated nanocrystalline layer 121 and ferrite layer 122, and the insulating layer 123 between the laminated half circular ring magnetic core one 1 and half circular ring magnetic core two 2 is a polyimide insulating layer to prevent interlayer short circuiting;
[0022] Upper shell 4 and lower shell 5 are hingedly installed at one side butt joint end position, and the other side butt joint end position of upper shell 4 and lower shell 5 is provided with a threaded connection part connected by bolt 7, and a washer 8 is arranged on the bolt 7 between the threaded connection parts of upper shell 4 and lower shell 5, which is conducive to the stability of air gap parameter, reduces vibration influence.
[0023] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.
[0024] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A magnetic core for DC detection comprising a half toroid core one (1) and a half toroid core two (2), characterized in that: The two butt joint surfaces of the semi-circular ring magnetic core one (1) and the semi-circular ring magnetic core two (2) are respectively provided with an air gap, and the two air gaps are symmetrically arranged, the air gap is a planar air gap left by machining the butt joint surface, and the air gap position of the butt joint surface of the semi-circular ring magnetic core one (1) and the semi-circular ring magnetic core two (2) is provided with an insulating gasket (3) to fill the air gap; The semi-circular ring magnetic core one (1) and the semi-circular ring magnetic core two (2) are respectively arranged in the upper shell (4) and the lower shell (5) of the mutual inductor, the two butt joint ends of the semi-circular ring magnetic core one (1) protrude outward at the two ports of the upper shell (4), the two butt joint ends of the semi-circular ring magnetic core two (2) are recessed inward at the two ports of the lower shell (5), and the butt joint end of the semi-circular ring magnetic core one (1) extends to the recessed position of the butt joint end of the semi-circular ring magnetic core two (2) to butt joint; The semi-circular ring magnetic core one (1) and the semi-circular ring magnetic core two (2) are both multi-layer composite structures, the semi-circular ring magnetic core one (1) and the insulating gasket (3) are encapsulated in the upper shell (4) through an epoxy resin layer (6), the semi-circular ring magnetic core two (2) and the insulating gasket (3) are encapsulated in the lower shell (5) through an epoxy resin layer (6), and the semi-circular ring magnetic core one (1) and the semi-circular ring magnetic core two (2) are both stacked composite structures in which nanocrystalline layers (121) and ferrite layers (122) are staggered, and an insulating layer (123) is arranged between the nanocrystalline layers (121) and the ferrite layers (122).
2. A magnetic core for DC sensing according to claim 1, characterized in that: The insulating gasket (3) is an epoxy resin gasket or a ceramic gasket.
3. A magnetic core for DC sensing according to claim 1, characterized in that: The insulating layer (123) between the semi-circular ring magnetic core one (1) and the semi-circular ring magnetic core two (2) is a polyimide insulating layer.
4. A magnetic core for DC sensing according to claim 1, characterized in that: The upper shell (4) and the lower shell (5) are hingedly installed at one side butt joint end position, the upper shell (4) and the lower shell (5) are provided with a threaded connection part threadedly connected through a bolt (7) at the other side butt joint end position, and a gasket (8) is sleeved on the bolt (7) between the threaded connection parts of the upper shell (4) and the lower shell (5).