Magnetic core with air gaps in end faces and inductor

Abstract

The utility model belongs to the technical field of inductors, and particularly relates to a magnetic core with air gaps in end faces and an inductor, the magnetic core comprises a first magnetic core and a second magnetic core, the top end face of the first magnetic core abuts against the bottom end face of the second magnetic core, a winding space is formed between the first magnetic core and the second magnetic core, and a magnetic core rod is arranged in the middle of the winding space. A first air gap is formed between the upper end surface of the magnetic core rod and the second magnetic core; the inductor comprises the magnetic core, and a winding is wound in the winding space of the magnetic core along the magnetic core rod. According to the magnetic core with the air gaps formed in the end faces and the inductor, the winding part of the winding space and the first air gap are prevented from being overlapped as far as possible, the influence of scattered magnetic flux generated by the first air gap on the winding can be reduced to the maximum extent, and induced current is prevented from being generated.

Description

Technical Field

[0001] The utility model belongs to the technical field of inductors, and particularly relates to a magnetic core with an end-face air gap and an inductor. Background Art

[0002] An inductor is an electromagnetic induction component wound with windings and is also one of the commonly used components in electronic circuits. An inductor is a set of series coaxial turns wound with enameled wire, cotton-covered wire, plastic-coated wire, etc. on an insulating skeleton, magnetic core or iron core. It is represented by the letter "L" in the circuit. Its main functions are to isolate and filter AC signals or form a resonant circuit with capacitors, resistors, etc. Inductors are generally divided into air-core inductors and magnetic-core inductors. Magnetic-core inductors are more widely used in industry. The accuracy of the inductance value is a key issue and is of great significance both theoretically and in practical applications.

[0003] In currently commonly used inductors, there are many positions where the air gap easily coincides with the windings. The scattered magnetic flux generated by the air gap easily affects the windings and generates induced current. Moreover, the unconstrained magnetic flux generated by the magnetic core easily causes eddy currents in the windings, and the larger the air gap, the more obvious the effect. Eddy currents easily cause the windings to heat up and lose energy. Since the magnetic flux in the magnetic core is a high-frequency alternating magnetic flux, the changing magnetic flux will generate current. When the magnetic flux passes through the windings, it will generate current in the wires, causing energy loss and resulting in the windings heating up. Content of the Utility Model

[0004] The purpose of the utility model is to provide a magnetic core with an end-face air gap and an inductor to solve the technical problems raised in the above background art.

[0005] To achieve the above technical purpose, the technical solution of the utility model is as follows:

[0006] A magnetic core with an end-face air gap includes a first magnetic core and a second magnetic core. The top end face of the first magnetic core abuts against the bottom end face of the second magnetic core. A winding space is formed between the first magnetic core and the second magnetic core. A magnetic core rod is provided in the middle of the winding space. A first air gap is formed between the upper end face of the magnetic core rod and the second magnetic core.

[0007] As an improvement, the first magnetic core is a first U-shaped piece. A first groove is provided on the inner side of the bottom wall of the first U-shaped piece. The inner sides of both side walls of the first U-shaped piece are first arc surfaces. The magnetic core rod is in a cylindrical shape. The arc extension direction of the first arc surface matches the arc extension direction of the outer peripheral surface of the magnetic core rod.

[0008] The lower end face of the magnetic core rod is flush with the top surface of the bottom wall of the first U-shaped piece. A second air gap is formed between the lower end face of the magnetic core rod and the bottom wall of the first groove.

[0009] As a further improvement, the second magnetic core is a first sheet, a bottom end surface of the first sheet is provided with a second groove, and the size, shape and position of the second groove correspond to the size, shape and position of the first groove;

[0010] The upper end surface of the magnetic core rod is flush with the bottom surface of the first I-piece, and the first air gap is formed between the upper end surface of the magnetic core rod and the top wall of the second groove.

[0011] As a further improvement, the second magnetic core is a second U-piece, and a third groove is provided on the inner side of the top wall of the second U-piece, and the size, shape and position of the third groove correspond to the size, shape and position of the first groove;

[0012] The inner sides of both side walls of the second U-piece are second arc-shaped surfaces, and the arc-shaped surface extension direction of the second arc-shaped surface matches the arc-shaped surface extension direction of the outer peripheral surface of the magnetic core rod;

[0013] The upper end surface of the magnetic core rod is flush with the top wall end surface of the second U-piece, and the first air gap is formed between the upper end surface of the magnetic core rod and the top wall of the third groove.

[0014] As a further improvement, the first magnetic core is a third U-piece, the magnetic core rod is in a square column shape, the bottom surface of the magnetic core rod is fixedly connected to the middle part of the bottom wall of the third U-piece, the second magnetic core is a second I-piece, and the bottom end surface of the second I-piece is provided with a fourth groove;

[0015] The upper end surface of the magnetic core rod is flush with the bottom surface of the second I-piece, and the first air gap is formed between the upper end surface of the magnetic core rod and the top wall of the fourth groove.

[0016] An inductor comprises the above-mentioned magnetic core, wherein a winding coil is wound along the magnetic core rod in the winding space of the magnetic core.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] The utility model provides a magnetic core with an air gap at the end face, a first air gap is formed between the upper end face of the magnetic core rod and the second magnetic core, a second air gap is formed between the lower end face of the magnetic core rod and the bottom wall of the first groove, a winding space is formed between the first magnetic core and the second magnetic core, and the winding part of the winding space avoids overlapping with the first air gap and the second air gap as much as possible, which can minimize the influence of scattered magnetic flux generated by the first air gap and the second air gap on the winding, and avoid the generation of induced current.

[0019] The magnetic core and inductor with an air gap opened on the end face provided by the present utility model, a winding space is formed between the first magnetic core and the second magnetic core. Both inner sides of the two side walls of the first U-shaped piece are the first arc-shaped surfaces, and both inner sides of the two side walls of the second U-shaped piece are the second arc-shaped surfaces. The magnetic core rod is in a cylindrical shape. The arc extension directions of the first arc-shaped surface and the second arc-shaped surface match the arc extension direction of the outer peripheral surface of the magnetic core rod, so as to make full use of the winding space and improve the space utilization rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the first magnetic core of Embodiment 1 of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the second magnetic core of Embodiment 1 of the present utility model;

[0023] Figure 4 is a schematic structural diagram of Embodiment 2 of the present utility model;

[0024] Figure 5 is a schematic structural diagram of Embodiment 3 of the present utility model;

[0025] Figure 6 is a schematic structural diagram of the inductor;

[0026] Wherein: 1 - first U-shaped piece, 11 - first groove, 12 - first arc-shaped surface, 2 - first I-shaped piece, 21 - second groove, 3 - second U-shaped piece, 31 - third groove, 32 - second arc-shaped surface, 4 - second I-shaped piece, 41 - fourth groove, 5 - third U-shaped piece, 6 - magnetic core rod, 7 - winding coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present utility model will be further described below in conjunction with the detailed embodiments and the drawings. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present application; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to this application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] Embodiment 1

[0030] As Figures 1-3 shown, a magnetic core with an air gap on the end face includes a first magnetic core and a second magnetic core. The top end face of the first magnetic core abuts against the bottom end face of the second magnetic core, and a winding space is formed between the first magnetic core and the second magnetic core. A magnetic core rod 6 is provided in the middle of the winding space, and a first air gap is formed between the upper end face of the magnetic core rod 6 and the second magnetic core.

[0031] The first magnetic core is a first U-shaped piece 1. A first groove 11 is provided on the inner side of the bottom wall of the first U-shaped piece 1. The inner sides of both side walls of the first U-shaped piece 1 are first arc surfaces 12. The magnetic core rod 6 is cylindrical, and the arc surface extension direction of the first arc surface 12 matches the arc surface extension direction of the outer peripheral surface of the magnetic core rod 6; so as to make full use of the winding space and improve the space utilization rate of the product.

[0032] The lower end face of the magnetic core rod 6 is flush with the top surface of the bottom wall of the first U-shaped piece 1, and a second air gap is formed between the lower end face of the magnetic core rod 6 and the bottom wall of the first groove 11.

[0033] The second magnetic core is a first I-shaped piece 2. A second groove 21 is provided on the bottom end face of the first I-shaped piece 2. The size, shape and position of the second groove 21 correspond to the size, shape and position of the first groove 11; the upper end face of the magnetic core rod 6 is flush with the bottom surface of the first I-shaped piece 2, and a first air gap is formed between the upper end face of the magnetic core rod 6 and the top wall of the second groove 21.

[0034] For the magnetic core with an air gap on the end face provided in Embodiment 1 of the present utility model, a first air gap is formed between the upper end face of the magnetic core rod 6 and the second magnetic core, a second air gap is formed between the lower end face of the magnetic core rod 6 and the bottom wall of the first groove 11, a winding space is formed between the first magnetic core and the second magnetic core, and the winding part of the winding space is as much as possible avoided from overlapping with the first air gap and the second air gap, which can minimize the influence of the scattered magnetic flux generated by the first air gap and the second air gap on the winding and avoid the generation of induced current.

[0035] Embodiment 2

[0036] As Figures 1-4As shown, a magnetic core with an air gap at the end face is different from the first embodiment in that the second magnetic core is a second U-piece 3, and a third groove 31 is provided on the inner side of the top wall of the second U-piece 3, and the size, shape and position of the third groove 31 correspond to the size, shape and position of the first groove 11; the inner sides of the two side walls of the second U-piece 3 are both second arcuate surfaces 32, and the arc extension direction of the second arcuate surface 32 matches the arc extension direction of the outer peripheral surface of the magnetic core rod 6; so as to make full use of the winding space and improve the space utilization rate of the product.

[0037] The upper end surface of the magnetic core rod 6 is flush with the top wall end surface of the second U-piece 3 , and a first air gap is formed between the upper end surface of the magnetic core rod 6 and the top wall of the third groove 31 .

[0038] In the magnetic core with air gaps at the end faces provided in the second embodiment of the utility model, a first air gap is formed between the upper end face of the magnetic core rod 6 and the second magnetic core, a second air gap is formed between the lower end face of the magnetic core rod 6 and the bottom wall of the first groove 11, and a winding space is formed between the first magnetic core and the second magnetic core. The winding part of the winding space avoids overlapping with the first air gap and the second air gap as much as possible, which can minimize the influence of the scattered magnetic flux generated by the first air gap and the second air gap on the winding and avoid the generation of induced current.

[0039] Embodiment 3

[0040] like Figures 1-5 As shown, a magnetic core with an air gap at the end face is different from the first and second embodiments in that the first magnetic core is a third U-piece 5, the magnetic core rod 6 is in the shape of a square cylinder, the bottom surface of the magnetic core rod 6 is fixedly connected to the middle of the bottom wall of the third U-piece 5, the magnetic core rod 6 and the third U-piece 5 can also be integrally formed, the second magnetic core is a second I-piece 4, and the bottom end surface of the second I-piece 4 is provided with a fourth groove 41; the upper end surface of the magnetic core rod 6 is flush with the bottom surface of the second I-piece 4, and a first air gap is formed between the upper end surface of the magnetic core rod 6 and the top wall of the fourth groove 41.

[0041] In the magnetic core with an air gap at the end provided in the third embodiment of the utility model, a first air gap is formed between the upper end face of the magnetic core rod 6 and the second magnetic core, a winding space is formed between the first magnetic core and the second magnetic core, and the winding part of the winding space and the first air gap are avoided to overlap as much as possible, which can minimize the influence of the scattered magnetic flux generated by the first air gap and the second air gap on the winding and avoid the generation of induced current.

[0042] An inductor includes any one of the magnetic cores of the first, second or third embodiments above, wherein a winding coil 7 is wound along a magnetic core rod 6 in a winding space of the magnetic core, an air gap is arranged at one end or both ends of the magnetic core rod 6, and the winding space and the air gap are avoided to overlap as much as possible, so that the influence of the scattered magnetic flux generated by the air gap on the winding can be reduced to the greatest extent, thereby avoiding the generation of induced current.

[0043] The specific embodiments of the present utility model described above do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A magnetic core with an air gap at the end surface, comprising a first magnetic core and a second magnetic core, characterized in that: The top end surface of the first magnetic core abuts against the bottom end surface of the second magnetic core, a winding space is formed between the first magnetic core and the second magnetic core, a magnetic core rod is provided in the middle of the winding space, and a first air gap is formed between the upper end surface of the magnetic core rod and the second magnetic core.

2. A magnetic core with an air gap at the end surface according to claim 1, characterized in that: The first magnetic core is a first U-piece, the inner side of the bottom wall of the first U-piece is provided with a first groove, the inner sides of both side walls of the first U-piece are first arc-shaped surfaces, the magnetic core rod is cylindrical, and the arc-shaped surface extending direction of the first arc-shaped surface matches the arc-shaped surface extending direction of the outer peripheral surface of the magnetic core rod; The lower end surface of the magnetic core rod is flush with the top surface of the bottom wall of the first U-piece, and a second air gap is formed between the lower end surface of the magnetic core rod and the bottom wall of the first groove.

3. A magnetic core with an air gap at the end surface according to claim 2, characterized in that: The second magnetic core is a first sheet, a bottom end surface of the first sheet is provided with a second groove, and the size, shape and position of the second groove correspond to the size, shape and position of the first groove; The upper end surface of the magnetic core rod is flush with the bottom surface of the first I-piece, and the first air gap is formed between the upper end surface of the magnetic core rod and the top wall of the second groove.

4. A magnetic core with an air gap at the end surface according to claim 2, characterized in that: The second magnetic core is a second U-piece, and a third groove is provided on the inner side of the top wall of the second U-piece, and the size, shape and position of the third groove correspond to the size, shape and position of the first groove; The inner sides of both side walls of the second U-piece are second arc-shaped surfaces, and the arc-shaped surface extension direction of the second arc-shaped surface matches the arc-shaped surface extension direction of the outer peripheral surface of the magnetic core rod; The upper end surface of the magnetic core rod is flush with the top wall end surface of the second U-piece, and the first air gap is formed between the upper end surface of the magnetic core rod and the top wall of the third groove.

5. The magnetic core with an air gap at the end surface according to claim 1, characterized in that: The first magnetic core is a third U-piece, the magnetic core rod is in a square column shape, the bottom surface of the magnetic core rod is fixedly connected to the middle of the bottom wall of the third U-piece, the second magnetic core is a second I-piece, and the bottom end surface of the second I-piece is provided with a fourth groove; The upper end surface of the magnetic core rod is flush with the bottom surface of the second I-piece, and the first air gap is formed between the upper end surface of the magnetic core rod and the top wall of the fourth groove.

6. An inductor, characterized in that: The invention comprises a magnetic core with an air gap at the end face as claimed in any one of claims 1 to 5, wherein a winding coil is wound along the magnetic core rod in the winding space of the magnetic core.

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